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| Rev | Author | Line No. | Line |
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| 1 | 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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| 360 | holgerb | 7 | // + Software Nutzungsbedingungen (english version: see below) |
| 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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| 1 | ingob | 13 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| 360 | holgerb | 14 | // + Die vom Lizenzgeber gelieferte Software ist urheberrechtlich geschützt. Alle Rechte an der Software sowie an sonstigen im |
| 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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| 1 | ingob | 31 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| 360 | holgerb | 32 | // + Software LICENSING TERMS |
| 1 | ingob | 33 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| 360 | holgerb | 34 | // + of HiSystems GmbH, Flachsmeerstrasse 2, 26802 Moormerland, Germany - the Licensor - |
| 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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| 1 | ingob | 55 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| 41 | ingob | 56 | #include <string.h> |
| 57 | #include "91x_lib.h" |
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| 58 | #include "i2c.h" |
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| 59 | #include "uart1.h" |
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| 119 | killagreg | 60 | #include "timer1.h" |
| 136 | killagreg | 61 | #include "config.h" |
| 41 | ingob | 62 | #include "led.h" |
| 1 | ingob | 63 | |
| 248 | killagreg | 64 | |
| 252 | killagreg | 65 | volatile u8 I2C_State = I2C_STATE_OFF; // only one byte, because of sync by nesting irqs |
| 66 | volatile u8 I2C_Error = I2C_ERROR_NOACK; // only one byte! |
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| 1 | ingob | 67 | |
| 248 | killagreg | 68 | // number of bytes to send |
| 69 | volatile u8 I2C_TxBufferSize; |
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| 70 | // number of bytes to receive |
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| 41 | ingob | 71 | volatile u8 I2C_RxBufferSize; |
| 248 | killagreg | 72 | // the transfer buffer |
| 73 | volatile u8 I2C_Buffer[I2C_BUFFER_LEN]; |
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| 74 | // the transfer direction |
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| 41 | ingob | 75 | volatile u8 I2C_Direction; |
| 248 | killagreg | 76 | // the slave address |
| 241 | killagreg | 77 | volatile u8 I2C_SlaveAddress = 0x00; |
| 248 | killagreg | 78 | // function pointer to process the received bytes |
| 241 | killagreg | 79 | I2C_pRxHandler_t I2C_pRxHandler = NULL; |
| 248 | killagreg | 80 | // goblal timeout |
| 41 | ingob | 81 | volatile u32 I2C1_Timeout = 0; |
| 1 | ingob | 82 | |
| 83 | //-------------------------------------------------------------- |
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| 84 | void I2C1_Init(void) |
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| 85 | { |
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| 41 | ingob | 86 | I2C_InitTypeDef I2C_Struct; |
| 87 | GPIO_InitTypeDef GPIO_InitStructure; |
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| 149 | killagreg | 88 | |
| 241 | killagreg | 89 | I2C_State = I2C_STATE_OFF; |
| 37 | killagreg | 90 | |
| 110 | killagreg | 91 | UART1_PutString("\r\n I2C init..."); |
| 41 | ingob | 92 | // enable Port 2 peripherie |
| 93 | SCU_APBPeriphClockConfig(__GPIO2, ENABLE); |
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| 94 | // disable a reset state |
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| 95 | SCU_APBPeriphReset(__GPIO2, DISABLE); |
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| 1 | ingob | 96 | |
| 41 | ingob | 97 | // free a busy bus |
| 1 | ingob | 98 | |
| 41 | ingob | 99 | // At switch on I2C devices can get in a state where they |
| 100 | // are still waiting for a command due to all the bus lines bouncing |
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| 101 | // around at startup have started clocking data into the device(s). |
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| 102 | // Enable the ports as open collector port outputs |
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| 103 | // and clock out at least 9 SCL pulses, then generate a stop |
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| 104 | // condition and then leave the clock line high. |
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| 37 | killagreg | 105 | |
| 41 | ingob | 106 | // configure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT to normal port operation |
| 107 | GPIO_StructInit(&GPIO_InitStructure); |
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| 108 | GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput; |
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| 109 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; |
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| 110 | GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector; |
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| 196 | killagreg | 111 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable; |
| 41 | ingob | 112 | GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt1; |
| 113 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
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| 37 | killagreg | 114 | |
| 41 | ingob | 115 | u8 i; |
| 116 | u32 delay; |
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| 117 | // set SCL high and then SDA to low (start condition) |
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| 118 | GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET); |
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| 119 | delay = SetDelay(1); |
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| 120 | while (!CheckDelay(delay)); |
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| 121 | GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_RESET); |
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| 122 | // toggle SCL at least 10 times from high to low to high |
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| 123 | for(i = 0; i < 10; i++) |
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| 124 | { |
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| 125 | delay = SetDelay(1); |
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| 126 | while (!CheckDelay(delay)); |
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| 1 | ingob | 127 | |
| 41 | ingob | 128 | GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_RESET); |
| 129 | delay = SetDelay(1); |
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| 130 | while (!CheckDelay(delay)); |
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| 131 | GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET); |
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| 132 | } |
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| 133 | delay = SetDelay(1); |
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| 134 | while (!CheckDelay(delay)); |
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| 135 | // create stop condition setting SDA HIGH when SCL is HIGH |
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| 136 | GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_SET); |
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| 37 | killagreg | 137 | |
| 138 | |||
| 41 | ingob | 139 | // reconfigure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT |
| 140 | GPIO_StructInit(&GPIO_InitStructure); |
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| 141 | GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput; |
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| 142 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; |
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| 143 | GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector; |
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| 196 | killagreg | 144 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Enable; |
| 41 | ingob | 145 | GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2; //I2C1_CLKOUT, I2C1_DOUT |
| 146 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
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| 147 | |||
| 148 | // enable I2C peripherie |
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| 149 | SCU_APBPeriphClockConfig(__I2C1,ENABLE); |
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| 150 | // reset I2C peripherie |
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| 151 | SCU_APBPeriphReset(__I2C1,ENABLE); |
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| 152 | SCU_APBPeriphReset(__I2C1,DISABLE); |
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| 153 | |||
| 154 | I2C_DeInit(I2C1); |
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| 155 | I2C_StructInit(&I2C_Struct); |
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| 156 | I2C_Struct.I2C_GeneralCall = I2C_GeneralCall_Disable; |
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| 157 | I2C_Struct.I2C_Ack = I2C_Ack_Enable; |
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| 136 | killagreg | 158 | I2C_Struct.I2C_CLKSpeed = I2C1_CLOCK; |
| 41 | ingob | 159 | I2C_Struct.I2C_OwnAddress = 0x00; |
| 160 | I2C_Init(I2C1, &I2C_Struct); |
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| 161 | |||
| 248 | killagreg | 162 | // empty rx and tx buffer counters |
| 41 | ingob | 163 | I2C_TxBufferSize = 0; |
| 164 | I2C_RxBufferSize = 0; |
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| 165 | |||
| 166 | I2C_Cmd(I2C1, ENABLE); |
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| 167 | I2C_ITConfig(I2C1, ENABLE); |
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| 168 | |||
| 136 | killagreg | 169 | VIC_Config(I2C1_ITLine, VIC_IRQ , PRIORITY_I2C1); |
| 41 | ingob | 170 | |
| 189 | killagreg | 171 | I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT); |
| 41 | ingob | 172 | I2C_GenerateSTOP(I2C1, ENABLE); |
| 241 | killagreg | 173 | I2C_State = I2C_STATE_IDLE; |
| 41 | ingob | 174 | |
| 248 | killagreg | 175 | // start some dummy transmissions cycles |
| 176 | // to get the irq routine to work |
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| 177 | for(i=0;i<10;i++) |
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| 178 | { |
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| 179 | I2C_State = I2C_STATE_BUFFBUSY; |
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| 180 | I2C_Transmission(0,1,0,1); |
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| 181 | if(I2C_WaitForEndOfTransmission(10)) break; |
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| 182 | UART1_Putchar('.'); |
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| 183 | } |
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| 110 | killagreg | 184 | UART1_PutString("ok"); |
| 1 | ingob | 185 | } |
| 186 | |||
| 41 | ingob | 187 | |
| 1 | ingob | 188 | //-------------------------------------------------------------- |
| 41 | ingob | 189 | void I2C1_Deinit(void) |
| 1 | ingob | 190 | { |
| 79 | killagreg | 191 | GPIO_InitTypeDef GPIO_InitStructure; |
| 110 | killagreg | 192 | UART1_PutString("\r\n I2C deinit..."); |
| 41 | ingob | 193 | I2C_GenerateStart(I2C1, DISABLE); |
| 194 | I2C_GenerateSTOP(I2C1, ENABLE); |
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| 195 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
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| 241 | killagreg | 196 | I2C_State = I2C_STATE_OFF; |
| 41 | ingob | 197 | I2C_ITConfig(I2C1, DISABLE); |
| 198 | I2C_Cmd(I2C1, DISABLE); |
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| 199 | I2C_DeInit(I2C1); |
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| 200 | SCU_APBPeriphClockConfig(__I2C1, DISABLE); |
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| 79 | killagreg | 201 | |
| 41 | ingob | 202 | // set ports to input |
| 203 | SCU_APBPeriphClockConfig(__GPIO2, ENABLE); |
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| 204 | GPIO_StructInit(&GPIO_InitStructure); |
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| 205 | GPIO_InitStructure.GPIO_Direction = GPIO_PinInput; |
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| 79 | killagreg | 206 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; |
| 207 | GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull; |
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| 196 | killagreg | 208 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable; |
| 79 | killagreg | 209 | GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1; |
| 210 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
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| 1 | ingob | 211 | |
| 241 | killagreg | 212 | // empty rx and tx buffer |
| 41 | ingob | 213 | I2C_TxBufferSize = 0; |
| 214 | I2C_RxBufferSize = 0; |
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| 37 | killagreg | 215 | |
| 189 | killagreg | 216 | I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT); |
| 37 | killagreg | 217 | |
| 110 | killagreg | 218 | UART1_PutString("ok"); |
| 41 | ingob | 219 | } |
| 1 | ingob | 220 | |
| 41 | ingob | 221 | //-------------------------------------------------------------- |
| 222 | void I2C1_IRQHandler(void) |
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| 223 | { |
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| 241 | killagreg | 224 | static u8 Rx_Idx = 0, Tx_Idx = 0; |
| 41 | ingob | 225 | u16 status; |
| 189 | killagreg | 226 | |
| 195 | killagreg | 227 | //IENABLE; // do not enable IRQ nesting for I2C!!!! |
| 41 | ingob | 228 | // detemine I2C State |
| 229 | status = I2C_GetLastEvent(I2C1); |
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| 230 | |||
| 231 | if(status & (I2C_FLAG_AF|I2C_FLAG_BERR)) // if an acknowledge failure or bus error occured |
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| 79 | killagreg | 232 | { // Set and subsequently clear the STOP bit while BTF is set. |
| 41 | ingob | 233 | while(I2C_GetFlagStatus (I2C1, I2C_FLAG_BTF) != RESET) |
| 234 | { |
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| 189 | killagreg | 235 | I2C_GenerateSTOP (I2C1, ENABLE); // free the bus |
| 41 | ingob | 236 | I2C_GenerateSTOP (I2C1, DISABLE); // free the bus |
| 237 | } |
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| 241 | killagreg | 238 | I2C_State = I2C_STATE_IDLE; |
| 252 | killagreg | 239 | I2C_Error = I2C_ERROR_NOACK; |
| 189 | killagreg | 240 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
| 241 | return; |
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| 41 | ingob | 242 | } |
| 243 | else |
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| 244 | { // depending on current i2c state |
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| 241 | killagreg | 245 | switch(status) |
| 41 | ingob | 246 | { |
| 247 | // the start condition was initiated on the bus |
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| 248 | case I2C_EVENT_MASTER_MODE_SELECT: |
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| 249 | // update current bus state variable |
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| 241 | killagreg | 250 | // jump to rx state if there is nothing to send |
| 41 | ingob | 251 | switch(I2C_Direction) |
| 252 | { |
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| 253 | case I2C_MODE_TRANSMITTER: |
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| 241 | killagreg | 254 | I2C_State = I2C_STATE_TX_PROGRESS; |
| 41 | ingob | 255 | break; |
| 79 | killagreg | 256 | |
| 41 | ingob | 257 | case I2C_MODE_RECEIVER: |
| 248 | killagreg | 258 | if (I2C_RxBufferSize == 0) // nothing to send? |
| 41 | ingob | 259 | { |
| 260 | I2C_GenerateSTOP (I2C1, ENABLE); |
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| 189 | killagreg | 261 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
| 241 | killagreg | 262 | I2C_State = I2C_STATE_IDLE; |
| 252 | killagreg | 263 | I2C_Error = I2C_ERROR_NONE; |
| 41 | ingob | 264 | return; |
| 265 | } |
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| 266 | else |
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| 267 | { |
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| 241 | killagreg | 268 | I2C_State = I2C_STATE_RX_PROGRESS; |
| 41 | ingob | 269 | } |
| 270 | break; |
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| 79 | killagreg | 271 | |
| 41 | ingob | 272 | default: // invalid direction |
| 273 | I2C_GenerateSTOP (I2C1, ENABLE); |
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| 189 | killagreg | 274 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
| 241 | killagreg | 275 | I2C_State = I2C_STATE_IDLE; |
| 252 | killagreg | 276 | I2C_Error = I2C_ERROR_UNKNOWN; |
| 41 | ingob | 277 | return; |
| 278 | } |
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| 279 | // enable acknowledge |
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| 280 | I2C_AcknowledgeConfig (I2C1, ENABLE); |
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| 281 | // send address/direction byte on the bus |
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| 241 | killagreg | 282 | I2C_Send7bitAddress(I2C1, I2C_SlaveAddress, I2C_Direction); |
| 41 | ingob | 283 | break; |
| 79 | killagreg | 284 | |
| 41 | ingob | 285 | // the address byte was send |
| 286 | case I2C_EVENT_MASTER_MODE_SELECTED: |
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| 287 | // Clear EV6 by set again the PE bit |
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| 79 | killagreg | 288 | I2C_Cmd(I2C1, ENABLE); |
| 41 | ingob | 289 | switch(I2C_State) |
| 290 | { |
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| 241 | killagreg | 291 | case I2C_STATE_TX_PROGRESS: |
| 292 | // send 1st data byte |
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| 41 | ingob | 293 | Tx_Idx = 0; |
| 248 | killagreg | 294 | I2C_SendData(I2C1, I2C_Buffer[Tx_Idx]); |
| 241 | killagreg | 295 | Tx_Idx++; |
| 41 | ingob | 296 | // reset timeout |
| 189 | killagreg | 297 | I2C1_Timeout = SetDelay(I2C1_TIMEOUT); // after inactivity the I2C1 bus will be reset |
| 41 | ingob | 298 | break; |
| 79 | killagreg | 299 | |
| 241 | killagreg | 300 | case I2C_STATE_RX_PROGRESS: |
| 41 | ingob | 301 | Rx_Idx = 0; |
| 241 | killagreg | 302 | // disable acknoledge if only one byte has to be read |
| 303 | if(I2C_RxBufferSize == 1) I2C_AcknowledgeConfig (I2C1, DISABLE); |
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| 41 | ingob | 304 | break; |
| 79 | killagreg | 305 | |
| 41 | ingob | 306 | default: // unknown I2C state |
| 307 | // should never happen |
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| 308 | I2C_GenerateSTOP (I2C1, ENABLE); |
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| 189 | killagreg | 309 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
| 241 | killagreg | 310 | I2C_State = I2C_STATE_IDLE; |
| 252 | killagreg | 311 | I2C_Error = I2C_ERROR_UNKNOWN; |
| 189 | killagreg | 312 | return; |
| 41 | ingob | 313 | break; |
| 314 | } |
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| 315 | break; |
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| 79 | killagreg | 316 | |
| 41 | ingob | 317 | // the master has transmitted a byte and slave has been acknowledged |
| 318 | case I2C_EVENT_MASTER_BYTE_TRANSMITTED: |
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| 79 | killagreg | 319 | |
| 41 | ingob | 320 | // some bytes have to be transmitted |
| 321 | if(Tx_Idx < I2C_TxBufferSize) |
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| 322 | { |
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| 248 | killagreg | 323 | I2C_SendData(I2C1, I2C_Buffer[Tx_Idx]); |
| 241 | killagreg | 324 | Tx_Idx++; |
| 41 | ingob | 325 | } |
| 189 | killagreg | 326 | else // last byte was send |
| 327 | { |
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| 41 | ingob | 328 | // generate stop or repeated start condition |
| 241 | killagreg | 329 | if (I2C_RxBufferSize > 0) // is any answer byte expected? |
| 41 | ingob | 330 | { |
| 79 | killagreg | 331 | I2C_Direction = I2C_MODE_RECEIVER; // switch to master receiver after repeated start condition |
| 332 | I2C_GenerateStart(I2C1, ENABLE); // initiate repeated start condition on the bus |
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| 41 | ingob | 333 | } |
| 334 | else |
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| 335 | { // stop communication |
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| 336 | I2C_GenerateSTOP(I2C1, ENABLE); // generate stop condition to free the bus |
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| 189 | killagreg | 337 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
| 252 | killagreg | 338 | I2C_State = I2C_STATE_IDLE; // ready for new actions |
| 339 | I2C_Error = I2C_ERROR_NONE; |
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| 41 | ingob | 340 | } |
| 341 | } |
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| 342 | break; |
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| 79 | killagreg | 343 | |
| 41 | ingob | 344 | // the master has received a byte from the slave |
| 79 | killagreg | 345 | case I2C_EVENT_MASTER_BYTE_RECEIVED: |
| 41 | ingob | 346 | // some bytes have to be received |
| 241 | killagreg | 347 | if ( Rx_Idx+1 < I2C_RxBufferSize) |
| 41 | ingob | 348 | { // copy received byte from the data register to the rx-buffer |
| 248 | killagreg | 349 | I2C_Buffer[Rx_Idx] = I2C_ReceiveData(I2C1); |
| 41 | ingob | 350 | } |
| 241 | killagreg | 351 | else // if the last byte was received |
| 41 | ingob | 352 | { |
| 353 | // generate a STOP condition on the bus before reading data register |
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| 354 | I2C_GenerateSTOP(I2C1, ENABLE); |
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| 248 | killagreg | 355 | I2C_Buffer[Rx_Idx] = I2C_ReceiveData(I2C1); |
| 241 | killagreg | 356 | // call the rx handler function to process recieved data |
| 248 | killagreg | 357 | if(I2C_pRxHandler != NULL) (*I2C_pRxHandler)((u8*)I2C_Buffer, I2C_RxBufferSize); |
| 241 | killagreg | 358 | I2C1_Timeout = SetDelay(I2C1_TIMEOUT); |
| 359 | DebugOut.Analog[15]++; |
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| 189 | killagreg | 360 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
| 241 | killagreg | 361 | I2C_State = I2C_STATE_IDLE; |
| 252 | killagreg | 362 | I2C_Error = I2C_ERROR_NONE; |
| 189 | killagreg | 363 | return; |
| 41 | ingob | 364 | } |
| 365 | Rx_Idx++; |
||
| 366 | // if the 2nd last byte was received disable acknowledge for the last one |
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| 241 | killagreg | 367 | if ( (Rx_Idx + 1) == I2C_RxBufferSize ) |
| 41 | ingob | 368 | { |
| 241 | killagreg | 369 | I2C_AcknowledgeConfig(I2C1, DISABLE); |
| 41 | ingob | 370 | } |
| 371 | break; |
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| 79 | killagreg | 372 | |
| 241 | killagreg | 373 | default:// unknown event |
| 374 | // should never happen |
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| 375 | I2C_GenerateSTOP (I2C1, ENABLE); |
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| 376 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
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| 377 | I2C_State = I2C_STATE_IDLE; |
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| 252 | killagreg | 378 | I2C_Error = I2C_ERROR_UNKNOWN; |
| 41 | ingob | 379 | break; |
| 380 | } |
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| 381 | } |
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| 195 | killagreg | 382 | //IDISABLE; // do not enable IRQ nesting for I2C!!!! |
| 378 | holgerb | 383 | VIC1->VAR = 0xFF; // write any value to VIC0 Vector address register |
| 1 | ingob | 384 | } |
| 248 | killagreg | 385 | |
| 241 | killagreg | 386 | // ---------------------------------------------------------------------------------------- |
| 248 | killagreg | 387 | // wait for end of transmission |
| 388 | u8 I2C_WaitForEndOfTransmission(u32 timeout) |
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| 389 | { |
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| 390 | u32 time = SetDelay(timeout); |
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| 391 | while(I2C_State != I2C_STATE_IDLE) |
||
| 392 | { |
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| 393 | if(CheckDelay(time)) return(0); |
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| 394 | } |
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| 395 | return(1); |
||
| 396 | } |
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| 397 | |||
| 398 | // ---------------------------------------------------------------------------------------- |
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| 399 | // try to get access to the transfer buffer within a timeout limit |
||
| 400 | // returs 1 on success and 0 on error/timeout |
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| 401 | u8 I2C_LockBuffer(u32 timeout) |
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| 402 | { |
||
| 403 | if(I2C_WaitForEndOfTransmission(timeout)) |
||
| 404 | { |
||
| 405 | I2C_State = I2C_STATE_BUFFBUSY; |
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| 252 | killagreg | 406 | I2C_Error = I2C_ERROR_UNKNOWN; |
| 248 | killagreg | 407 | return(1); |
| 408 | } |
||
| 409 | else return(0); |
||
| 410 | } |
||
| 411 | // ---------------------------------------------------------------------------------------- |
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| 241 | killagreg | 412 | // initate an i2c transmission |
| 248 | killagreg | 413 | u8 I2C_Transmission(u8 SlaveAddr, u8 TxBytes, I2C_pRxHandler_t pRxHandler, u8 RxBytes) |
| 1 | ingob | 414 | { |
| 241 | killagreg | 415 | u8 retval = 0; |
| 248 | killagreg | 416 | if(I2C_State == I2C_STATE_BUFFBUSY) |
| 417 | { |
||
| 418 | if((RxBytes > I2C_BUFFER_LEN) || (TxBytes > I2C_BUFFER_LEN)) |
||
| 419 | { |
||
| 420 | I2C_State = I2C_STATE_IDLE; |
||
| 421 | return(retval); |
||
| 422 | } |
||
| 241 | killagreg | 423 | I2C_RxBufferSize = RxBytes; |
| 248 | killagreg | 424 | I2C_TxBufferSize = TxBytes; |
| 241 | killagreg | 425 | // set direction to master transmitter |
| 248 | killagreg | 426 | if( (I2C_TxBufferSize > 0) && (I2C_TxBufferSize < I2C_BUFFER_LEN) ) I2C_Direction = I2C_MODE_TRANSMITTER; |
| 427 | else if (( I2C_RxBufferSize > 0 ) && (I2C_RxBufferSize < I2C_BUFFER_LEN) ) I2C_Direction = I2C_MODE_RECEIVER; |
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| 241 | killagreg | 428 | else // nothing to send or receive |
| 189 | killagreg | 429 | { |
| 248 | killagreg | 430 | I2C_State = I2C_STATE_IDLE; |
| 252 | killagreg | 431 | I2C_Error = I2C_ERROR_NONE; |
| 241 | killagreg | 432 | I2C_TxBufferSize = 0; |
| 433 | I2C_RxBufferSize = 0; |
||
| 434 | return(retval); |
||
| 189 | killagreg | 435 | } |
| 241 | killagreg | 436 | // update slave address and rx data handler funbction pointer |
| 437 | I2C_SlaveAddress = SlaveAddr; |
||
| 438 | I2C_pRxHandler = pRxHandler; |
||
| 189 | killagreg | 439 | // test on busy flag and clear it |
| 440 | I2C_CheckEvent( I2C1, I2C_FLAG_BUSY ); |
||
| 242 | killagreg | 441 | // enable I2C IRQ |
| 442 | VIC_ITCmd(I2C1_ITLine, ENABLE); |
||
| 189 | killagreg | 443 | // initiate start condition on the bus |
| 444 | I2C_GenerateStart(I2C1, ENABLE); |
||
| 241 | killagreg | 445 | retval = 1; |
| 446 | } |
||
| 447 | return(retval); |
||
| 41 | ingob | 448 | } |