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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 | // + Copyright (c) 2008 Ingo Busker, Holger Buss |
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171 | ingob | 6 | // + Nur für den privaten Gebrauch / NON-COMMERCIAL USE ONLY |
1 | ingob | 7 | // + FOR NON COMMERCIAL USE ONLY |
8 | // + www.MikroKopter.com |
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9 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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37 | killagreg | 10 | // + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation), |
11 | // + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist. |
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12 | // + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt |
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13 | // + bzgl. der Nutzungsbedingungen aufzunehmen. |
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1 | ingob | 14 | // + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen, |
15 | // + Verkauf von Luftbildaufnahmen, usw. |
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16 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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37 | killagreg | 17 | // + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht, |
1 | ingob | 18 | // + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen |
19 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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20 | // + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts |
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21 | // + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de" |
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22 | // + eindeutig als Ursprung verlinkt werden |
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23 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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24 | // + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion |
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25 | // + Benutzung auf eigene Gefahr |
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26 | // + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden |
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27 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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171 | ingob | 28 | // + Die Portierung oder Nutzung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur |
1 | ingob | 29 | // + mit unserer Zustimmung zulässig |
30 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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31 | // + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen |
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32 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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37 | killagreg | 33 | // + Redistributions of source code (with or without modifications) must retain the above copyright notice, |
1 | ingob | 34 | // + this list of conditions and the following disclaimer. |
35 | // + * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived |
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36 | // + from this software without specific prior written permission. |
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37 | killagreg | 37 | // + * The use of this project (hardware, software, binary files, sources and documentation) is only permitted |
1 | ingob | 38 | // + for non-commercial use (directly or indirectly) |
37 | killagreg | 39 | // + Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted |
1 | ingob | 40 | // + with our written permission |
37 | killagreg | 41 | // + * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be |
42 | // + clearly linked as origin |
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171 | ingob | 43 | // + * porting the sources to other systems or using the software on other systems (except hardware from www.mikrokopter.de) is not allowed |
1 | ingob | 44 | // |
45 | // + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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46 | // + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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47 | // + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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48 | // + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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49 | // + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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50 | // + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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51 | // + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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52 | // + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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53 | // + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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54 | // + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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37 | killagreg | 55 | // + POSSIBILITY OF SUCH DAMAGE. |
1 | ingob | 56 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
41 | ingob | 57 | #include <string.h> |
58 | #include "91x_lib.h" |
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59 | #include "i2c.h" |
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60 | #include "uart1.h" |
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119 | killagreg | 61 | #include "timer1.h" |
136 | killagreg | 62 | #include "config.h" |
41 | ingob | 63 | #include "led.h" |
1 | ingob | 64 | |
248 | killagreg | 65 | |
252 | killagreg | 66 | volatile u8 I2C_State = I2C_STATE_OFF; // only one byte, because of sync by nesting irqs |
67 | volatile u8 I2C_Error = I2C_ERROR_NOACK; // only one byte! |
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1 | ingob | 68 | |
248 | killagreg | 69 | // number of bytes to send |
70 | volatile u8 I2C_TxBufferSize; |
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71 | // number of bytes to receive |
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41 | ingob | 72 | volatile u8 I2C_RxBufferSize; |
248 | killagreg | 73 | // the transfer buffer |
74 | volatile u8 I2C_Buffer[I2C_BUFFER_LEN]; |
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75 | // the transfer direction |
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41 | ingob | 76 | volatile u8 I2C_Direction; |
248 | killagreg | 77 | // the slave address |
241 | killagreg | 78 | volatile u8 I2C_SlaveAddress = 0x00; |
248 | killagreg | 79 | // function pointer to process the received bytes |
241 | killagreg | 80 | I2C_pRxHandler_t I2C_pRxHandler = NULL; |
248 | killagreg | 81 | // goblal timeout |
41 | ingob | 82 | volatile u32 I2C1_Timeout = 0; |
1 | ingob | 83 | |
84 | //-------------------------------------------------------------- |
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85 | void I2C1_Init(void) |
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86 | { |
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41 | ingob | 87 | I2C_InitTypeDef I2C_Struct; |
88 | GPIO_InitTypeDef GPIO_InitStructure; |
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149 | killagreg | 89 | |
241 | killagreg | 90 | I2C_State = I2C_STATE_OFF; |
37 | killagreg | 91 | |
110 | killagreg | 92 | UART1_PutString("\r\n I2C init..."); |
41 | ingob | 93 | // enable Port 2 peripherie |
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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1 | ingob | 97 | |
41 | ingob | 98 | // free a busy bus |
1 | ingob | 99 | |
41 | ingob | 100 | // At switch on I2C devices can get in a state where they |
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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37 | killagreg | 106 | |
41 | ingob | 107 | // configure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT to normal port operation |
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_2 | GPIO_Pin_3; |
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111 | GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector; |
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196 | killagreg | 112 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable; |
41 | ingob | 113 | GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt1; |
114 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
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37 | killagreg | 115 | |
41 | ingob | 116 | u8 i; |
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_2, 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_3, 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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1 | ingob | 128 | |
41 | ingob | 129 | GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_RESET); |
130 | delay = SetDelay(1); |
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131 | while (!CheckDelay(delay)); |
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132 | GPIO_WriteBit(GPIO2, GPIO_Pin_2, 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_3, Bit_SET); |
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37 | killagreg | 138 | |
139 | |||
41 | ingob | 140 | // reconfigure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT |
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_2 | GPIO_Pin_3; |
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144 | GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector; |
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196 | killagreg | 145 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Enable; |
41 | ingob | 146 | GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2; //I2C1_CLKOUT, I2C1_DOUT |
147 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
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148 | |||
149 | // enable I2C peripherie |
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150 | SCU_APBPeriphClockConfig(__I2C1,ENABLE); |
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151 | // reset I2C peripherie |
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152 | SCU_APBPeriphReset(__I2C1,ENABLE); |
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153 | SCU_APBPeriphReset(__I2C1,DISABLE); |
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154 | |||
155 | I2C_DeInit(I2C1); |
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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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136 | killagreg | 159 | I2C_Struct.I2C_CLKSpeed = I2C1_CLOCK; |
41 | ingob | 160 | I2C_Struct.I2C_OwnAddress = 0x00; |
161 | I2C_Init(I2C1, &I2C_Struct); |
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162 | |||
248 | killagreg | 163 | // empty rx and tx buffer counters |
41 | ingob | 164 | I2C_TxBufferSize = 0; |
165 | I2C_RxBufferSize = 0; |
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166 | |||
167 | I2C_Cmd(I2C1, ENABLE); |
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168 | I2C_ITConfig(I2C1, ENABLE); |
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169 | |||
136 | killagreg | 170 | VIC_Config(I2C1_ITLine, VIC_IRQ , PRIORITY_I2C1); |
41 | ingob | 171 | |
189 | killagreg | 172 | I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT); |
41 | ingob | 173 | I2C_GenerateSTOP(I2C1, ENABLE); |
241 | killagreg | 174 | I2C_State = I2C_STATE_IDLE; |
41 | ingob | 175 | |
248 | killagreg | 176 | // start some dummy transmissions cycles |
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 | I2C_State = I2C_STATE_BUFFBUSY; |
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181 | I2C_Transmission(0,1,0,1); |
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182 | if(I2C_WaitForEndOfTransmission(10)) break; |
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183 | UART1_Putchar('.'); |
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184 | } |
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110 | killagreg | 185 | UART1_PutString("ok"); |
1 | ingob | 186 | } |
187 | |||
41 | ingob | 188 | |
1 | ingob | 189 | //-------------------------------------------------------------- |
41 | ingob | 190 | void I2C1_Deinit(void) |
1 | ingob | 191 | { |
79 | killagreg | 192 | GPIO_InitTypeDef GPIO_InitStructure; |
110 | killagreg | 193 | UART1_PutString("\r\n I2C deinit..."); |
41 | ingob | 194 | I2C_GenerateStart(I2C1, DISABLE); |
195 | I2C_GenerateSTOP(I2C1, ENABLE); |
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196 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
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241 | killagreg | 197 | I2C_State = I2C_STATE_OFF; |
41 | ingob | 198 | I2C_ITConfig(I2C1, DISABLE); |
199 | I2C_Cmd(I2C1, DISABLE); |
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200 | I2C_DeInit(I2C1); |
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201 | SCU_APBPeriphClockConfig(__I2C1, DISABLE); |
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79 | killagreg | 202 | |
41 | ingob | 203 | // set ports to input |
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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79 | killagreg | 207 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3; |
208 | GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull; |
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196 | killagreg | 209 | GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable; |
79 | killagreg | 210 | GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1; |
211 | GPIO_Init(GPIO2, &GPIO_InitStructure); |
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1 | ingob | 212 | |
241 | killagreg | 213 | // empty rx and tx buffer |
41 | ingob | 214 | I2C_TxBufferSize = 0; |
215 | I2C_RxBufferSize = 0; |
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37 | killagreg | 216 | |
189 | killagreg | 217 | I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT); |
37 | killagreg | 218 | |
110 | killagreg | 219 | UART1_PutString("ok"); |
41 | ingob | 220 | } |
1 | ingob | 221 | |
41 | ingob | 222 | //-------------------------------------------------------------- |
223 | void I2C1_IRQHandler(void) |
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224 | { |
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241 | killagreg | 225 | static u8 Rx_Idx = 0, Tx_Idx = 0; |
41 | ingob | 226 | u16 status; |
189 | killagreg | 227 | |
195 | killagreg | 228 | //IENABLE; // do not enable IRQ nesting for I2C!!!! |
41 | ingob | 229 | // detemine I2C State |
230 | status = I2C_GetLastEvent(I2C1); |
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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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79 | killagreg | 233 | { // Set and subsequently clear the STOP bit while BTF is set. |
41 | ingob | 234 | while(I2C_GetFlagStatus (I2C1, I2C_FLAG_BTF) != RESET) |
235 | { |
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189 | killagreg | 236 | I2C_GenerateSTOP (I2C1, ENABLE); // free the bus |
41 | ingob | 237 | I2C_GenerateSTOP (I2C1, DISABLE); // free the bus |
238 | } |
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241 | killagreg | 239 | I2C_State = I2C_STATE_IDLE; |
252 | killagreg | 240 | I2C_Error = I2C_ERROR_NOACK; |
189 | killagreg | 241 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
41 | ingob | 242 | LED_GRN_OFF; |
189 | killagreg | 243 | return; |
41 | ingob | 244 | } |
245 | else |
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246 | { // depending on current i2c state |
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241 | killagreg | 247 | switch(status) |
41 | ingob | 248 | { |
249 | // the start condition was initiated on the bus |
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250 | case I2C_EVENT_MASTER_MODE_SELECT: |
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251 | LED_GRN_ON; |
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252 | // update current bus state variable |
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241 | killagreg | 253 | // jump to rx state if there is nothing to send |
41 | ingob | 254 | switch(I2C_Direction) |
255 | { |
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256 | case I2C_MODE_TRANSMITTER: |
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241 | killagreg | 257 | I2C_State = I2C_STATE_TX_PROGRESS; |
41 | ingob | 258 | break; |
79 | killagreg | 259 | |
41 | ingob | 260 | case I2C_MODE_RECEIVER: |
248 | killagreg | 261 | if (I2C_RxBufferSize == 0) // nothing to send? |
41 | ingob | 262 | { |
263 | I2C_GenerateSTOP (I2C1, ENABLE); |
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189 | killagreg | 264 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
265 | LED_GRN_OFF; |
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241 | killagreg | 266 | I2C_State = I2C_STATE_IDLE; |
252 | killagreg | 267 | I2C_Error = I2C_ERROR_NONE; |
41 | ingob | 268 | return; |
269 | } |
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270 | else |
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271 | { |
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241 | killagreg | 272 | I2C_State = I2C_STATE_RX_PROGRESS; |
41 | ingob | 273 | } |
274 | break; |
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79 | killagreg | 275 | |
41 | ingob | 276 | default: // invalid direction |
277 | I2C_GenerateSTOP (I2C1, ENABLE); |
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189 | killagreg | 278 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
279 | LED_GRN_OFF; |
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241 | killagreg | 280 | I2C_State = I2C_STATE_IDLE; |
252 | killagreg | 281 | I2C_Error = I2C_ERROR_UNKNOWN; |
41 | ingob | 282 | return; |
283 | } |
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284 | // enable acknowledge |
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285 | I2C_AcknowledgeConfig (I2C1, ENABLE); |
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286 | // send address/direction byte on the bus |
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241 | killagreg | 287 | I2C_Send7bitAddress(I2C1, I2C_SlaveAddress, I2C_Direction); |
41 | ingob | 288 | break; |
79 | killagreg | 289 | |
41 | ingob | 290 | // the address byte was send |
291 | case I2C_EVENT_MASTER_MODE_SELECTED: |
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292 | // Clear EV6 by set again the PE bit |
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79 | killagreg | 293 | I2C_Cmd(I2C1, ENABLE); |
41 | ingob | 294 | switch(I2C_State) |
295 | { |
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241 | killagreg | 296 | case I2C_STATE_TX_PROGRESS: |
297 | // send 1st data byte |
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41 | ingob | 298 | Tx_Idx = 0; |
248 | killagreg | 299 | I2C_SendData(I2C1, I2C_Buffer[Tx_Idx]); |
241 | killagreg | 300 | Tx_Idx++; |
41 | ingob | 301 | // reset timeout |
189 | killagreg | 302 | I2C1_Timeout = SetDelay(I2C1_TIMEOUT); // after inactivity the I2C1 bus will be reset |
41 | ingob | 303 | break; |
79 | killagreg | 304 | |
241 | killagreg | 305 | case I2C_STATE_RX_PROGRESS: |
41 | ingob | 306 | Rx_Idx = 0; |
241 | killagreg | 307 | // disable acknoledge if only one byte has to be read |
308 | if(I2C_RxBufferSize == 1) I2C_AcknowledgeConfig (I2C1, DISABLE); |
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41 | ingob | 309 | break; |
79 | killagreg | 310 | |
41 | ingob | 311 | default: // unknown I2C state |
312 | // should never happen |
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313 | I2C_GenerateSTOP (I2C1, ENABLE); |
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189 | killagreg | 314 | LED_GRN_OFF; |
315 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
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241 | killagreg | 316 | I2C_State = I2C_STATE_IDLE; |
252 | killagreg | 317 | I2C_Error = I2C_ERROR_UNKNOWN; |
189 | killagreg | 318 | return; |
41 | ingob | 319 | break; |
320 | } |
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321 | break; |
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79 | killagreg | 322 | |
41 | ingob | 323 | // the master has transmitted a byte and slave has been acknowledged |
324 | case I2C_EVENT_MASTER_BYTE_TRANSMITTED: |
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79 | killagreg | 325 | |
41 | ingob | 326 | // some bytes have to be transmitted |
327 | if(Tx_Idx < I2C_TxBufferSize) |
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328 | { |
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248 | killagreg | 329 | I2C_SendData(I2C1, I2C_Buffer[Tx_Idx]); |
241 | killagreg | 330 | Tx_Idx++; |
41 | ingob | 331 | } |
189 | killagreg | 332 | else // last byte was send |
333 | { |
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41 | ingob | 334 | // generate stop or repeated start condition |
241 | killagreg | 335 | if (I2C_RxBufferSize > 0) // is any answer byte expected? |
41 | ingob | 336 | { |
79 | killagreg | 337 | I2C_Direction = I2C_MODE_RECEIVER; // switch to master receiver after repeated start condition |
338 | I2C_GenerateStart(I2C1, ENABLE); // initiate repeated start condition on the bus |
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41 | ingob | 339 | } |
340 | else |
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341 | { // stop communication |
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342 | I2C_GenerateSTOP(I2C1, ENABLE); // generate stop condition to free the bus |
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189 | killagreg | 343 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
41 | ingob | 344 | LED_GRN_OFF; |
252 | killagreg | 345 | I2C_State = I2C_STATE_IDLE; // ready for new actions |
346 | I2C_Error = I2C_ERROR_NONE; |
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41 | ingob | 347 | } |
348 | } |
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349 | break; |
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79 | killagreg | 350 | |
41 | ingob | 351 | // the master has received a byte from the slave |
79 | killagreg | 352 | case I2C_EVENT_MASTER_BYTE_RECEIVED: |
41 | ingob | 353 | // some bytes have to be received |
241 | killagreg | 354 | if ( Rx_Idx+1 < I2C_RxBufferSize) |
41 | ingob | 355 | { // copy received byte from the data register to the rx-buffer |
248 | killagreg | 356 | I2C_Buffer[Rx_Idx] = I2C_ReceiveData(I2C1); |
41 | ingob | 357 | } |
241 | killagreg | 358 | else // if the last byte was received |
41 | ingob | 359 | { |
360 | // generate a STOP condition on the bus before reading data register |
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361 | I2C_GenerateSTOP(I2C1, ENABLE); |
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248 | killagreg | 362 | I2C_Buffer[Rx_Idx] = I2C_ReceiveData(I2C1); |
241 | killagreg | 363 | // call the rx handler function to process recieved data |
248 | killagreg | 364 | if(I2C_pRxHandler != NULL) (*I2C_pRxHandler)((u8*)I2C_Buffer, I2C_RxBufferSize); |
241 | killagreg | 365 | I2C1_Timeout = SetDelay(I2C1_TIMEOUT); |
366 | DebugOut.Analog[15]++; |
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189 | killagreg | 367 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
368 | LED_GRN_OFF; |
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241 | killagreg | 369 | I2C_State = I2C_STATE_IDLE; |
252 | killagreg | 370 | I2C_Error = I2C_ERROR_NONE; |
189 | killagreg | 371 | return; |
41 | ingob | 372 | } |
373 | Rx_Idx++; |
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374 | // if the 2nd last byte was received disable acknowledge for the last one |
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241 | killagreg | 375 | if ( (Rx_Idx + 1) == I2C_RxBufferSize ) |
41 | ingob | 376 | { |
241 | killagreg | 377 | I2C_AcknowledgeConfig(I2C1, DISABLE); |
41 | ingob | 378 | } |
379 | break; |
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79 | killagreg | 380 | |
241 | killagreg | 381 | default:// unknown event |
382 | // should never happen |
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383 | I2C_GenerateSTOP (I2C1, ENABLE); |
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384 | LED_GRN_OFF; |
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385 | VIC_ITCmd(I2C1_ITLine, DISABLE); |
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386 | I2C_State = I2C_STATE_IDLE; |
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252 | killagreg | 387 | I2C_Error = I2C_ERROR_UNKNOWN; |
41 | ingob | 388 | break; |
389 | } |
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390 | } |
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195 | killagreg | 391 | //IDISABLE; // do not enable IRQ nesting for I2C!!!! |
1 | ingob | 392 | } |
248 | killagreg | 393 | |
241 | killagreg | 394 | // ---------------------------------------------------------------------------------------- |
248 | killagreg | 395 | // wait for end of transmission |
396 | u8 I2C_WaitForEndOfTransmission(u32 timeout) |
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397 | { |
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398 | u32 time = SetDelay(timeout); |
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399 | while(I2C_State != I2C_STATE_IDLE) |
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400 | { |
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401 | if(CheckDelay(time)) return(0); |
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402 | } |
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403 | return(1); |
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404 | } |
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405 | |||
406 | // ---------------------------------------------------------------------------------------- |
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407 | // try to get access to the transfer buffer within a timeout limit |
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408 | // returs 1 on success and 0 on error/timeout |
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409 | u8 I2C_LockBuffer(u32 timeout) |
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410 | { |
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411 | if(I2C_WaitForEndOfTransmission(timeout)) |
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412 | { |
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413 | I2C_State = I2C_STATE_BUFFBUSY; |
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252 | killagreg | 414 | I2C_Error = I2C_ERROR_UNKNOWN; |
248 | killagreg | 415 | return(1); |
416 | } |
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417 | else return(0); |
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418 | } |
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419 | // ---------------------------------------------------------------------------------------- |
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241 | killagreg | 420 | // initate an i2c transmission |
248 | killagreg | 421 | u8 I2C_Transmission(u8 SlaveAddr, u8 TxBytes, I2C_pRxHandler_t pRxHandler, u8 RxBytes) |
1 | ingob | 422 | { |
241 | killagreg | 423 | u8 retval = 0; |
248 | killagreg | 424 | if(I2C_State == I2C_STATE_BUFFBUSY) |
425 | { |
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426 | if((RxBytes > I2C_BUFFER_LEN) || (TxBytes > I2C_BUFFER_LEN)) |
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427 | { |
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428 | I2C_State = I2C_STATE_IDLE; |
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429 | return(retval); |
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430 | } |
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241 | killagreg | 431 | I2C_RxBufferSize = RxBytes; |
248 | killagreg | 432 | I2C_TxBufferSize = TxBytes; |
241 | killagreg | 433 | // set direction to master transmitter |
248 | killagreg | 434 | if( (I2C_TxBufferSize > 0) && (I2C_TxBufferSize < I2C_BUFFER_LEN) ) I2C_Direction = I2C_MODE_TRANSMITTER; |
435 | else if (( I2C_RxBufferSize > 0 ) && (I2C_RxBufferSize < I2C_BUFFER_LEN) ) I2C_Direction = I2C_MODE_RECEIVER; |
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241 | killagreg | 436 | else // nothing to send or receive |
189 | killagreg | 437 | { |
248 | killagreg | 438 | I2C_State = I2C_STATE_IDLE; |
252 | killagreg | 439 | I2C_Error = I2C_ERROR_NONE; |
241 | killagreg | 440 | I2C_TxBufferSize = 0; |
441 | I2C_RxBufferSize = 0; |
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442 | return(retval); |
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189 | killagreg | 443 | } |
241 | killagreg | 444 | // update slave address and rx data handler funbction pointer |
445 | I2C_SlaveAddress = SlaveAddr; |
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446 | I2C_pRxHandler = pRxHandler; |
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189 | killagreg | 447 | // test on busy flag and clear it |
448 | I2C_CheckEvent( I2C1, I2C_FLAG_BUSY ); |
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242 | killagreg | 449 | // enable I2C IRQ |
450 | VIC_ITCmd(I2C1_ITLine, ENABLE); |
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189 | killagreg | 451 | // initiate start condition on the bus |
452 | I2C_GenerateStart(I2C1, ENABLE); |
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241 | killagreg | 453 | retval = 1; |
454 | } |
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455 | return(retval); |
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41 | ingob | 456 | } |