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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 464 | ingob | 1 | /*#######################################################################################*/ |
| 2 | /* !!! THIS IS NOT FREE SOFTWARE !!! */ |
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| 3 | /*#######################################################################################*/ |
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| 4 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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| 5 | // + www.MikroKopter.com |
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| 6 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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| 7 | // + Software Nutzungsbedingungen (english version: see below) |
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| 8 | // + der Fa. HiSystems GmbH, Flachsmeerstrasse 2, 26802 Moormerland - nachfolgend Lizenzgeber genannt - |
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| 9 | // + Der Lizenzgeber räumt dem Kunden ein nicht-ausschließliches, zeitlich und räumlich* unbeschränktes Recht ein, die im den |
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| 10 | // + Mikrocontroller verwendete Firmware für die Hardware Flight-Ctrl, Navi-Ctrl, BL-Ctrl, MK3Mag & PC-Programm MikroKopter-Tool |
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| 11 | // + - nachfolgend Software genannt - nur für private Zwecke zu nutzen. |
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| 12 | // + Der Einsatz dieser Software ist nur auf oder mit Produkten des Lizenzgebers zulässig. |
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| 13 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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| 14 | // + Die vom Lizenzgeber gelieferte Software ist urheberrechtlich geschützt. Alle Rechte an der Software sowie an sonstigen im |
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| 15 | // + Rahmen der Vertragsanbahnung und Vertragsdurchführung überlassenen Unterlagen stehen im Verhältnis der Vertragspartner ausschließlich dem Lizenzgeber zu. |
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| 16 | // + Die in der Software enthaltenen Copyright-Vermerke, Markenzeichen, andere Rechtsvorbehalte, Seriennummern sowie |
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| 17 | // + sonstige der Programmidentifikation dienenden Merkmale dürfen vom Kunden nicht verändert oder unkenntlich gemacht werden. |
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| 18 | // + Der Kunde trifft angemessene Vorkehrungen für den sicheren Einsatz der Software. Er wird die Software gründlich auf deren |
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| 19 | // + Verwendbarkeit zu dem von ihm beabsichtigten Zweck testen, bevor er diese operativ einsetzt. |
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| 20 | // + Die Haftung des Lizenzgebers wird - soweit gesetzlich zulässig - begrenzt in Höhe des typischen und vorhersehbaren |
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| 21 | // + Schadens. Die gesetzliche Haftung bei Personenschäden und nach dem Produkthaftungsgesetz bleibt unberührt. Dem Lizenzgeber steht jedoch der Einwand |
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| 22 | // + des Mitverschuldens offen. |
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| 23 | // + Der Kunde trifft angemessene Vorkehrungen für den Fall, dass die Software ganz oder teilweise nicht ordnungsgemäß arbeitet. |
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| 24 | // + Er wird die Software gründlich auf deren Verwendbarkeit zu dem von ihm beabsichtigten Zweck testen, bevor er diese operativ einsetzt. |
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| 25 | // + Der Kunde wird er seine Daten vor Einsatz der Software nach dem Stand der Technik sichern. |
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| 26 | // + Der Kunde ist darüber unterrichtet, dass der Lizenzgeber seine Daten im zur Vertragsdurchführung erforderlichen Umfang |
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| 27 | // + und auf Grundlage der Datenschutzvorschriften erhebt, speichert, verarbeitet und, sofern notwendig, an Dritte übermittelt. |
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| 28 | // + *) Die räumliche Nutzung bezieht sich nur auf den Einsatzort, nicht auf die Reichweite der programmierten Software. |
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| 29 | // + #### ENDE DER NUTZUNGSBEDINGUNGEN ####' |
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| 30 | // + Hinweis: Informationen über erweiterte Nutzungsrechte (wie z.B. Nutzung für nicht-private Zwecke) sind auf Anfrage per Email an info(@)hisystems.de verfügbar. |
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| 31 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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| 32 | // + Software LICENSING TERMS |
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| 33 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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| 34 | // + of HiSystems GmbH, Flachsmeerstrasse 2, 26802 Moormerland, Germany - the Licensor - |
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| 35 | // + The Licensor grants the customer a non-exclusive license to use the microcontroller firmware of the Flight-Ctrl, Navi-Ctrl, BL-Ctrl, and MK3Mag hardware |
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| 36 | // + (the Software) exclusively for private purposes. The License is unrestricted with respect to time and territory*. |
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| 37 | // + The Software may only be used with the Licensor's products. |
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| 38 | // + The Software provided by the Licensor is protected by copyright. With respect to the relationship between the parties to this |
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| 39 | // + agreement, all rights pertaining to the Software and other documents provided during the preparation and execution of this |
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| 40 | // + agreement shall be the property of the Licensor. |
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| 41 | // + The information contained in the Software copyright notices, trademarks, other legal reservations, serial numbers and other |
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| 42 | // + features that can be used to identify the program may not be altered or defaced by the customer. |
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| 43 | // + The customer shall be responsible for taking reasonable precautions |
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| 44 | // + for the safe use of the Software. The customer shall test the Software thoroughly regarding its suitability for the |
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| 45 | // + intended purpose before implementing it for actual operation. The Licensor's liability shall be limited to the extent of typical and |
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| 46 | // + foreseeable damage to the extent permitted by law, notwithstanding statutory liability for bodily injury and product |
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| 47 | // + liability. However, the Licensor shall be entitled to the defense of contributory negligence. |
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| 48 | // + The customer will take adequate precautions in the case, that the software is not working properly. The customer will test |
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| 49 | // + the software for his purpose before any operational usage. The customer will backup his data before using the software. |
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| 50 | // + The customer understands that the Licensor collects, stores and processes, and, where required, forwards, customer data |
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| 51 | // + to third parties to the extent necessary for executing the agreement, subject to applicable data protection and privacy regulations. |
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| 52 | // + *) The territory aspect only refers to the place where the Software is used, not its programmed range. |
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| 53 | // + #### END OF LICENSING TERMS #### |
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| 54 | // + Note: For information on license extensions (e.g. commercial use), please contact us at info(@)hisystems.de. |
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| 55 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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| 56 | #include <string.h> |
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| 57 | #include "91x_lib.h" |
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| 58 | #include "i2c0.h" |
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| 59 | #include "i2c.h" |
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| 60 | #include "uart1.h" |
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| 61 | #include "timer1.h" |
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| 62 | #include "config.h" |
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| 63 | #include "led.h" |
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| 64 | |||
| 65 | |||
| 66 | volatile u8 I2C0_State = I2C_STATE_OFF; // only one byte, because of sync by nesting irqs |
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| 67 | volatile u8 I2C0_Error = I2C_ERROR_NOACK; // only one byte! |
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| 68 | |||
| 69 | // number of bytes to send |
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| 70 | volatile u8 I2C0_TxBufferSize; |
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| 71 | // number of bytes to receive |
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| 72 | volatile u8 I2C0_RxBufferSize; |
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| 73 | // the transfer buffer |
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| 74 | volatile u8 I2C0_Buffer[I2C0_Buffer_LEN]; |
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| 75 | // the transfer direction |
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| 76 | volatile u8 I2C0_Direction; |
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| 77 | // the slave address |
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| 78 | volatile u8 I2C0_SlaveAddress = 0x00; |
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| 79 | // function pointer to process the received bytes |
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| 80 | I2C_pRxHandler_t I2C0_pRxHandler = NULL; |
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| 81 | // goblal timeout |
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| 82 | volatile u32 I2C0_Timeout = 0; |
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| 83 | |||
| 84 | //-------------------------------------------------------------- |
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| 85 | void I2C0_Init(void) |
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| 86 | { |
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| 87 | I2C_InitTypeDef I2C_Struct; |
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| 88 | GPIO_InitTypeDef GPIO_InitStructure; |
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| 89 | |||
| 90 | I2C0_State = I2C_STATE_OFF; |
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| 91 | |||
| 92 | UART1_PutString("\r\n I2C0 init..."); |
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| 93 | // enable Port 2 peripherie |
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| 94 | SCU_APBPeriphClockConfig(__GPIO2, ENABLE); |
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| 95 | // disable a reset state |
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| 96 | SCU_APBPeriphReset(__GPIO2, DISABLE); |
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| 97 | |||
| 98 | // free a busy bus |
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| 99 | |||
| 100 | // At switch on I2C devices can get in a state where they |
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| 101 | // are still waiting for a command due to all the bus lines bouncing |
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| 102 | // around at startup have started clocking data into the device(s). |
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| 103 | // Enable the ports as open collector port outputs |
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| 104 | // and clock out at least 9 SCL pulses, then generate a stop |
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| 105 | // condition and then leave the clock line high. |
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| 106 | |||
| 107 | // configure P2.2->I2C0_CLKOUT and P2.3->I2C0_DOUT to normal port operation |
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| 108 | GPIO_StructInit(&GPIO_InitStructure); |
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| 109 | GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput; |
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| 110 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0| GPIO_Pin_1; |
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| 111 | GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector; |
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| 112 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable; |
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| 113 | GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt1; |
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| 114 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
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| 115 | |||
| 116 | u8 i; |
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| 117 | u32 delay; |
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| 118 | // set SCL high and then SDA to low (start condition) |
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| 119 | GPIO_WriteBit(GPIO2, GPIO_Pin_0, Bit_SET); |
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| 120 | delay = SetDelay(1); |
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| 121 | while (!CheckDelay(delay)); |
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| 122 | GPIO_WriteBit(GPIO2, GPIO_Pin_1, Bit_RESET); |
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| 123 | // toggle SCL at least 10 times from high to low to high |
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| 124 | for(i = 0; i < 10; i++) |
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| 125 | { |
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| 126 | delay = SetDelay(1); |
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| 127 | while (!CheckDelay(delay)); |
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| 128 | |||
| 129 | GPIO_WriteBit(GPIO2, GPIO_Pin_0, Bit_RESET); |
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| 130 | delay = SetDelay(1); |
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| 131 | while (!CheckDelay(delay)); |
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| 132 | GPIO_WriteBit(GPIO2, GPIO_Pin_0, Bit_SET); |
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| 133 | } |
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| 134 | delay = SetDelay(1); |
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| 135 | while (!CheckDelay(delay)); |
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| 136 | // create stop condition setting SDA HIGH when SCL is HIGH |
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| 137 | GPIO_WriteBit(GPIO2, GPIO_Pin_1, Bit_SET); |
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| 138 | |||
| 139 | |||
| 140 | // reconfigure P2.2->I2C0_CLKOUT and P2.3->I2C0_DOUT |
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| 141 | GPIO_StructInit(&GPIO_InitStructure); |
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| 142 | GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput; |
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| 143 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; |
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| 144 | GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector; |
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| 145 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Enable; |
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| 146 | GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2; //I2C0_CLKOUT, I2C0_DOUT |
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| 147 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
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| 148 | |||
| 149 | // enable I2C peripherie |
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| 150 | SCU_APBPeriphClockConfig(__I2C0,ENABLE); |
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| 151 | // reset I2C peripherie |
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| 152 | SCU_APBPeriphReset(__I2C0,ENABLE); |
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| 153 | SCU_APBPeriphReset(__I2C0,DISABLE); |
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| 154 | |||
| 155 | I2C_DeInit(I2C0); |
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| 156 | I2C_StructInit(&I2C_Struct); |
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| 157 | I2C_Struct.I2C_GeneralCall = I2C_GeneralCall_Disable; |
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| 158 | I2C_Struct.I2C_Ack = I2C_Ack_Enable; |
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| 159 | I2C_Struct.I2C_CLKSpeed = I2C1_CLOCK; |
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| 160 | I2C_Struct.I2C_OwnAddress = 0x00; |
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| 161 | I2C_Init(I2C0, &I2C_Struct); |
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| 162 | |||
| 163 | // empty rx and tx buffer counters |
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| 164 | I2C0_TxBufferSize = 0; |
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| 165 | I2C0_RxBufferSize = 0; |
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| 166 | |||
| 167 | I2C_Cmd(I2C0, ENABLE); |
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| 168 | I2C_ITConfig(I2C0, ENABLE); |
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| 169 | |||
| 170 | VIC_Config(I2C0_ITLine, VIC_IRQ , PRIORITY_I2C0); |
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| 171 | |||
| 172 | I2C0_Timeout = SetDelay(10*I2C0_Timeout); |
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| 173 | I2C_GenerateSTOP(I2C0, ENABLE); |
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| 174 | I2C0_State = I2C_STATE_IDLE; |
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| 175 | |||
| 176 | // start some dummy transmissions cycles |
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| 177 | // to get the irq routine to work |
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| 178 | for(i=0;i<10;i++) |
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| 179 | { |
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| 180 | I2C0_State = I2C_STATE_BUFFBUSY; |
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| 181 | I2C0_Transmission(0,1,0,1); |
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| 182 | if(I2C0_WaitForEndOfTransmission(10)) break; |
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| 183 | UART1_Putchar('.'); |
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| 184 | } |
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| 185 | UART1_PutString("ok"); |
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| 186 | } |
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| 187 | |||
| 188 | |||
| 189 | //-------------------------------------------------------------- |
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| 190 | void I2C0_Deinit(void) |
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| 191 | { |
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| 192 | GPIO_InitTypeDef GPIO_InitStructure; |
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| 193 | UART1_PutString("\r\n I2C deinit..."); |
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| 194 | I2C_GenerateStart(I2C0, DISABLE); |
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| 195 | I2C_GenerateSTOP(I2C0, ENABLE); |
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| 196 | VIC_ITCmd(I2C0_ITLine, DISABLE); |
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| 197 | I2C0_State = I2C_STATE_OFF; |
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| 198 | I2C_ITConfig(I2C0, DISABLE); |
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| 199 | I2C_Cmd(I2C0, DISABLE); |
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| 200 | I2C_DeInit(I2C0); |
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| 201 | SCU_APBPeriphClockConfig(__I2C0, DISABLE); |
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| 202 | |||
| 203 | // set ports to input |
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| 204 | SCU_APBPeriphClockConfig(__GPIO2, ENABLE); |
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| 205 | GPIO_StructInit(&GPIO_InitStructure); |
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| 206 | GPIO_InitStructure.GPIO_Direction = GPIO_PinInput; |
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| 207 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; |
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| 208 | GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull; |
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| 209 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable; |
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| 210 | GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1; |
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| 211 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
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| 212 | |||
| 213 | // empty rx and tx buffer |
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| 214 | I2C0_TxBufferSize = 0; |
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| 215 | I2C0_RxBufferSize = 0; |
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| 216 | |||
| 217 | I2C0_Timeout = SetDelay(10*I2C0_Timeout); |
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| 218 | |||
| 219 | UART1_PutString("ok"); |
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| 220 | } |
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| 221 | |||
| 222 | //-------------------------------------------------------------- |
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| 223 | void I2C0_IRQHandler(void) |
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| 224 | { |
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| 225 | static u8 Rx_Idx = 0, Tx_Idx = 0; |
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| 226 | u16 status; |
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| 227 | |||
| 228 | //IENABLE; // do not enable IRQ nesting for I2C!!!! |
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| 229 | // detemine I2C State |
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| 230 | status = I2C_GetLastEvent(I2C0); |
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| 231 | |||
| 232 | if(status & (I2C_FLAG_AF|I2C_FLAG_BERR)) // if an acknowledge failure or bus error occured |
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| 233 | { // Set and subsequently clear the STOP bit while BTF is set. |
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| 234 | while(I2C_GetFlagStatus (I2C0, I2C_FLAG_BTF) != RESET) |
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| 235 | { |
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| 236 | I2C_GenerateSTOP (I2C0, ENABLE); // free the bus |
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| 237 | I2C_GenerateSTOP (I2C0, DISABLE); // free the bus |
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| 238 | } |
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| 239 | I2C0_State = I2C_STATE_IDLE; |
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| 240 | I2C0_Error = I2C_ERROR_NOACK; |
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| 241 | VIC_ITCmd(I2C0_ITLine, DISABLE); |
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| 242 | return; |
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| 243 | } |
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| 244 | else |
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| 245 | { // depending on current i2c state |
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| 246 | switch(status) |
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| 247 | { |
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| 248 | // the start condition was initiated on the bus |
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| 249 | case I2C_EVENT_MASTER_MODE_SELECT: |
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| 250 | // update current bus state variable |
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| 251 | // jump to rx state if there is nothing to send |
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| 252 | switch(I2C0_Direction) |
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| 253 | { |
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| 254 | case I2C_MODE_TRANSMITTER: |
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| 255 | I2C0_State = I2C_STATE_TX_PROGRESS; |
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| 256 | break; |
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| 257 | |||
| 258 | case I2C_MODE_RECEIVER: |
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| 259 | if (I2C0_RxBufferSize == 0) // nothing to send? |
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| 260 | { |
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| 261 | I2C_GenerateSTOP (I2C0, ENABLE); |
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| 262 | VIC_ITCmd(I2C0_ITLine, DISABLE); |
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| 263 | I2C0_State = I2C_STATE_IDLE; |
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| 264 | I2C0_Error = I2C_ERROR_NONE; |
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| 265 | return; |
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| 266 | } |
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| 267 | else |
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| 268 | { |
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| 269 | I2C0_State = I2C_STATE_RX_PROGRESS; |
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| 270 | } |
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| 271 | break; |
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| 272 | |||
| 273 | default: // invalid direction |
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| 274 | I2C_GenerateSTOP (I2C0, ENABLE); |
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| 275 | VIC_ITCmd(I2C0_ITLine, DISABLE); |
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| 276 | I2C0_State = I2C_STATE_IDLE; |
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| 277 | I2C0_Error = I2C_ERROR_UNKNOWN; |
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| 278 | return; |
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| 279 | } |
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| 280 | // enable acknowledge |
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| 281 | I2C_AcknowledgeConfig (I2C0, ENABLE); |
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| 282 | // send address/direction byte on the bus |
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| 283 | I2C_Send7bitAddress(I2C0, I2C0_SlaveAddress, I2C0_Direction); |
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| 284 | break; |
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| 285 | |||
| 286 | // the address byte was send |
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| 287 | case I2C_EVENT_MASTER_MODE_SELECTED: |
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| 288 | // Clear EV6 by set again the PE bit |
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| 289 | I2C_Cmd(I2C0, ENABLE); |
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| 290 | switch(I2C0_State) |
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| 291 | { |
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| 292 | case I2C_STATE_TX_PROGRESS: |
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| 293 | // send 1st data byte |
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| 294 | Tx_Idx = 0; |
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| 295 | I2C_SendData(I2C0, I2C0_Buffer[Tx_Idx]); |
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| 296 | Tx_Idx++; |
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| 297 | // reset timeout |
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| 298 | I2C0_Timeout = SetDelay(I2C0_Timeout); // after inactivity the I2C0 bus will be reset |
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| 299 | break; |
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| 300 | |||
| 301 | case I2C_STATE_RX_PROGRESS: |
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| 302 | Rx_Idx = 0; |
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| 303 | // disable acknoledge if only one byte has to be read |
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| 304 | if(I2C0_RxBufferSize == 1) I2C_AcknowledgeConfig (I2C0, DISABLE); |
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| 305 | break; |
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| 306 | |||
| 307 | default: // unknown I2C state |
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| 308 | // should never happen |
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| 309 | I2C_GenerateSTOP (I2C0, ENABLE); |
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| 310 | VIC_ITCmd(I2C0_ITLine, DISABLE); |
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| 311 | I2C0_State = I2C_STATE_IDLE; |
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| 312 | I2C0_Error = I2C_ERROR_UNKNOWN; |
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| 313 | return; |
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| 314 | break; |
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| 315 | } |
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| 316 | break; |
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| 317 | |||
| 318 | // the master has transmitted a byte and slave has been acknowledged |
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| 319 | case I2C_EVENT_MASTER_BYTE_TRANSMITTED: |
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| 320 | |||
| 321 | // some bytes have to be transmitted |
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| 322 | if(Tx_Idx < I2C0_TxBufferSize) |
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| 323 | { |
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| 324 | I2C_SendData(I2C0, I2C0_Buffer[Tx_Idx]); |
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| 325 | Tx_Idx++; |
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| 326 | } |
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| 327 | else // last byte was send |
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| 328 | { |
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| 329 | // generate stop or repeated start condition |
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| 330 | if (I2C0_RxBufferSize > 0) // is any answer byte expected? |
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| 331 | { |
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| 332 | I2C0_Direction = I2C_MODE_RECEIVER; // switch to master receiver after repeated start condition |
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| 333 | I2C_GenerateStart(I2C0, ENABLE); // initiate repeated start condition on the bus |
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| 334 | } |
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| 335 | else |
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| 336 | { // stop communication |
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| 337 | I2C_GenerateSTOP(I2C0, ENABLE); // generate stop condition to free the bus |
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| 338 | VIC_ITCmd(I2C0_ITLine, DISABLE); |
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| 339 | I2C0_State = I2C_STATE_IDLE; // ready for new actions |
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| 340 | I2C0_Error = I2C_ERROR_NONE; |
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| 341 | } |
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| 342 | } |
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| 343 | break; |
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| 344 | |||
| 345 | // the master has received a byte from the slave |
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| 346 | case I2C_EVENT_MASTER_BYTE_RECEIVED: |
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| 347 | // some bytes have to be received |
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| 348 | if ( Rx_Idx+1 < I2C0_RxBufferSize) |
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| 349 | { // copy received byte from the data register to the rx-buffer |
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| 350 | I2C0_Buffer[Rx_Idx] = I2C_ReceiveData(I2C0); |
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| 351 | } |
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| 352 | else // if the last byte was received |
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| 353 | { |
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| 354 | // generate a STOP condition on the bus before reading data register |
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| 355 | I2C_GenerateSTOP(I2C0, ENABLE); |
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| 356 | I2C0_Buffer[Rx_Idx] = I2C_ReceiveData(I2C0); |
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| 357 | // call the rx handler function to process recieved data |
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| 358 | if(I2C0_pRxHandler != NULL) (*I2C0_pRxHandler)((u8*)I2C0_Buffer, I2C0_RxBufferSize); |
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| 359 | I2C0_Timeout = SetDelay(I2C0_Timeout); |
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| 360 | DebugOut.Analog[15]++; |
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| 361 | VIC_ITCmd(I2C0_ITLine, DISABLE); |
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| 362 | I2C0_State = I2C_STATE_IDLE; |
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| 363 | I2C0_Error = I2C_ERROR_NONE; |
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| 364 | return; |
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| 365 | } |
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| 366 | Rx_Idx++; |
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| 367 | // if the 2nd last byte was received disable acknowledge for the last one |
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| 368 | if ( (Rx_Idx + 1) == I2C0_RxBufferSize ) |
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| 369 | { |
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| 370 | I2C_AcknowledgeConfig(I2C0, DISABLE); |
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| 371 | } |
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| 372 | break; |
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| 373 | |||
| 374 | default:// unknown event |
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| 375 | // should never happen |
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| 376 | I2C_GenerateSTOP (I2C0, ENABLE); |
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| 377 | VIC_ITCmd(I2C0_ITLine, DISABLE); |
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| 378 | I2C0_State = I2C_STATE_IDLE; |
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| 379 | I2C0_Error = I2C_ERROR_UNKNOWN; |
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| 380 | break; |
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| 381 | } |
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| 382 | } |
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| 383 | //IDISABLE; // do not enable IRQ nesting for I2C!!!! |
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| 384 | VIC1->VAR = 0xFF; // write any value to VIC0 Vector address register |
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| 385 | } |
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| 386 | |||
| 387 | // ---------------------------------------------------------------------------------------- |
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| 388 | // wait for end of transmission |
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| 389 | u8 I2C0_WaitForEndOfTransmission(u32 timeout) |
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| 390 | { |
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| 391 | u32 time = SetDelay(timeout); |
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| 392 | while(I2C0_State != I2C_STATE_IDLE) |
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| 393 | { |
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| 394 | if(CheckDelay(time)) return(0); |
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| 395 | } |
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| 396 | return(1); |
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| 397 | } |
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| 398 | |||
| 399 | // ---------------------------------------------------------------------------------------- |
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| 400 | // try to get access to the transfer buffer within a timeout limit |
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| 401 | // returs 1 on success and 0 on error/timeout |
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| 402 | u8 I2C0_LockBuffer(u32 timeout) |
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| 403 | { |
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| 404 | if(I2C0_WaitForEndOfTransmission(timeout)) |
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| 405 | { |
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| 406 | I2C0_State = I2C_STATE_BUFFBUSY; |
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| 407 | I2C0_Error = I2C_ERROR_UNKNOWN; |
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| 408 | return(1); |
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| 409 | } |
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| 410 | else return(0); |
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| 411 | } |
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| 412 | // ---------------------------------------------------------------------------------------- |
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| 413 | // initate an i2c transmission |
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| 414 | u8 I2C0_Transmission(u8 SlaveAddr, u8 TxBytes, I2C_pRxHandler_t pRxHandler, u8 RxBytes) |
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| 415 | { |
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| 416 | u8 retval = 0; |
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| 417 | if(I2C0_State == I2C_STATE_BUFFBUSY) |
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| 418 | { |
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| 419 | if((RxBytes > I2C0_Buffer_LEN) || (TxBytes > I2C0_Buffer_LEN)) |
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| 420 | { |
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| 421 | I2C0_State = I2C_STATE_IDLE; |
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| 422 | return(retval); |
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| 423 | } |
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| 424 | I2C0_RxBufferSize = RxBytes; |
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| 425 | I2C0_TxBufferSize = TxBytes; |
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| 426 | // set direction to master transmitter |
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| 427 | if( (I2C0_TxBufferSize > 0) && (I2C0_TxBufferSize < I2C0_Buffer_LEN) ) I2C0_Direction = I2C_MODE_TRANSMITTER; |
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| 428 | else if (( I2C0_RxBufferSize > 0 ) && (I2C0_RxBufferSize < I2C0_Buffer_LEN) ) I2C0_Direction = I2C_MODE_RECEIVER; |
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| 429 | else // nothing to send or receive |
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| 430 | { |
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| 431 | I2C0_State = I2C_STATE_IDLE; |
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| 432 | I2C0_Error = I2C_ERROR_NONE; |
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| 433 | I2C0_TxBufferSize = 0; |
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| 434 | I2C0_RxBufferSize = 0; |
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| 435 | return(retval); |
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| 436 | } |
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| 437 | // update slave address and rx data handler funbction pointer |
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| 438 | I2C0_SlaveAddress = SlaveAddr; |
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| 439 | I2C0_pRxHandler = pRxHandler; |
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| 440 | // test on busy flag and clear it |
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| 441 | I2C_CheckEvent( I2C0, I2C_FLAG_BUSY ); |
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| 442 | // enable I2C IRQ |
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| 443 | VIC_ITCmd(I2C0_ITLine, ENABLE); |
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| 444 | // initiate start condition on the bus |
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| 445 | I2C_GenerateStart(I2C0, ENABLE); |
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| 446 | retval = 1; |
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| 447 | } |
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| 448 | return(retval); |
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| 449 | } |