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annotate Small_CPU/Src/i2c.c @ 334:143fe85f82a2 v1.5.0 release

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building a 1.5
author heinrichsweikamp
date Sun, 04 Aug 2019 11:01:06 +0200
parents 4fe5400567e7
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1 #include "baseCPU2.h"
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2 #include "i2c.h"
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3 #include "scheduler.h"
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4
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5 /* Private typedef -----------------------------------------------------------*/
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6 /* Private define ------------------------------------------------------------*/
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7 /* Private macro -------------------------------------------------------------*/
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8
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9
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10 // ===============================================================================
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11 // I2C addresses - see i2c.h
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12 // ===============================================================================
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13
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14 I2C_HandleTypeDef I2cHandle;
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17 /*
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18 static void I2C_Error_Handler(void)
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19 {
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20 while(1)
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21 {
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22 }
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23 }
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24 */
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25
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26 GPIO_PinState HAL_I2C_Read_Data_PIN(void)
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27 {
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28 return HAL_GPIO_ReadPin(I2Cx_SDA_GPIO_PORT,I2Cx_SDA_PIN);
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29 }
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31 void HAL_I2C_Send_One_CLOCK(void)
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32 {
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33 HAL_GPIO_WritePin(I2Cx_SCL_GPIO_PORT, I2Cx_SCL_PIN, GPIO_PIN_RESET);
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34 HAL_Delay(1);
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35 HAL_GPIO_WritePin(I2Cx_SCL_GPIO_PORT, I2Cx_SCL_PIN, GPIO_PIN_SET);
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36 HAL_Delay(1);
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37 }
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39 GPIO_PinState MX_I2C1_TestAndClear(void)
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40 {
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41 GPIO_PinState retval;
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42 uint8_t repeatcnt = 3;
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43
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44 I2C_DeInit();
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45 HAL_I2C_ManualControl_MspInit();
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46
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47 /* The SDA line is expected to be HIGH if no com is pending => send dummy clock signals if that is not the case */
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48 do
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49 {
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50 for(int i=0; i<20;i++)
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51 {
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52 if(HAL_I2C_Read_Data_PIN() == GPIO_PIN_RESET)
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53 HAL_I2C_Send_One_CLOCK();
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54 else
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55 break;
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56 }
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57 retval = HAL_I2C_Read_Data_PIN();
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58 }while ((repeatcnt-- > 0) && (retval != GPIO_PIN_SET));
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59
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60 return retval;
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61 }
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62
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63 HAL_StatusTypeDef MX_I2C1_Init(void)
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64 {
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65 I2cHandle.Instance = I2Cx;
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66 I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
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67 I2cHandle.Init.ClockSpeed = 88000; /* Reduced to avoid behavior described in errata: Mismatch on the “Setup time for a repeated Start condition” */
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68 I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
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69 I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2; /* don't care if not in fast mode */
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70 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
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71 I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
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72 I2cHandle.Init.OwnAddress1 = 0x01; /* don't care because of master mode */
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74 /* According to documentation setting filters before I2C initialization is recommended */
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75 /* HAL_I2CEx_AnalogFilter_Config(&I2cHandle, I2C_ANALOGFILTER_ENABLED); */
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76 HAL_I2CEx_ConfigDigitalFilter(&I2cHandle,0x0F);
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78 global.I2C_SystemStatus = HAL_I2C_Init(&I2cHandle);
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80 if(global.dataSendToSlavePending)
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81 {
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82 scheduleSpecial_Evaluate_DataSendToSlave();
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83 }
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84 return global.I2C_SystemStatus;
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85 }
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87
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88 void I2C_DeInit(void)
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89 {
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90 HAL_I2C_DeInit(&I2cHandle);
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91 }
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92
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93 static uint8_t i2c_errors = 0;
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94
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95 void I2C_Error_count(void)
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96 {
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97 i2c_errors++;
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98 }
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99
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100
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101 HAL_StatusTypeDef I2C_Master_Transmit( uint16_t DevAddress, uint8_t *pData, uint16_t Size)
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102 {
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103 if(global.I2C_SystemStatus != HAL_OK)
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104 return global.I2C_SystemStatus;
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105
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106 global.I2C_SystemStatus = HAL_I2C_Master_Transmit(&I2cHandle, DevAddress, pData, Size, 10);
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107 if(global.I2C_SystemStatus != HAL_OK)
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108 {
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109 I2C_Error_count();
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110 }
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111
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112 return global.I2C_SystemStatus;
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113 }
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114
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115 HAL_StatusTypeDef I2C_Master_Receive( uint16_t DevAddress, uint8_t *pData, uint16_t Size)
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116 {
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117 if(global.I2C_SystemStatus != HAL_OK)
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118 return global.I2C_SystemStatus;
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119
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120 global.I2C_SystemStatus = HAL_I2C_Master_Receive(&I2cHandle, DevAddress, pData, Size, 10);
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121 if(global.I2C_SystemStatus != HAL_OK)
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122 {
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123 I2C_Error_count();
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124 }
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125
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126 return global.I2C_SystemStatus;
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127 }