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annotate Small_CPU/Src/i2c.c @ 778:74253a41cf80
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| author | heinrichsweikamp |
|---|---|
| date | Mon, 22 May 2023 09:15:09 +0200 |
| parents | 4fe5400567e7 |
| children |
| rev | line source |
|---|---|
| 38 | 1 #include "baseCPU2.h" |
| 2 #include "i2c.h" | |
| 3 #include "scheduler.h" | |
| 4 | |
| 5 /* Private typedef -----------------------------------------------------------*/ | |
| 6 /* Private define ------------------------------------------------------------*/ | |
| 7 /* Private macro -------------------------------------------------------------*/ | |
| 8 | |
| 9 | |
| 10 // =============================================================================== | |
| 11 // I2C addresses - see i2c.h | |
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12 // =============================================================================== |
| 38 | 13 |
| 14 I2C_HandleTypeDef I2cHandle; | |
| 15 | |
| 16 | |
| 17 /* | |
| 18 static void I2C_Error_Handler(void) | |
| 19 { | |
| 20 while(1) | |
| 21 { | |
| 22 } | |
| 23 } | |
| 24 */ | |
| 25 | |
| 26 GPIO_PinState HAL_I2C_Read_Data_PIN(void) | |
| 27 { | |
| 28 return HAL_GPIO_ReadPin(I2Cx_SDA_GPIO_PORT,I2Cx_SDA_PIN); | |
| 29 } | |
| 30 | |
| 31 void HAL_I2C_Send_One_CLOCK(void) | |
| 32 { | |
| 33 HAL_GPIO_WritePin(I2Cx_SCL_GPIO_PORT, I2Cx_SCL_PIN, GPIO_PIN_RESET); | |
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34 HAL_Delay(1); |
| 38 | 35 HAL_GPIO_WritePin(I2Cx_SCL_GPIO_PORT, I2Cx_SCL_PIN, GPIO_PIN_SET); |
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36 HAL_Delay(1); |
| 38 | 37 } |
| 38 | |
| 39 GPIO_PinState MX_I2C1_TestAndClear(void) | |
| 40 { | |
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41 GPIO_PinState retval; |
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42 uint8_t repeatcnt = 3; |
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43 |
| 38 | 44 I2C_DeInit(); |
| 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 |
| 38 | 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; |
| 38 | 61 } |
| 62 | |
| 63 HAL_StatusTypeDef MX_I2C1_Init(void) | |
| 64 { | |
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65 I2cHandle.Instance = I2Cx; |
| 38 | 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 */ |
| 38 | 70 I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED; |
| 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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73 |
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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); |
| 38 | 77 |
| 78 global.I2C_SystemStatus = HAL_I2C_Init(&I2cHandle); | |
| 100 | 79 |
| 80 if(global.dataSendToSlavePending) | |
| 81 { | |
| 82 scheduleSpecial_Evaluate_DataSendToSlave(); | |
| 83 } | |
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84 return global.I2C_SystemStatus; |
| 38 | 85 } |
| 86 | |
| 87 | |
| 88 void I2C_DeInit(void) | |
| 89 { | |
| 90 HAL_I2C_DeInit(&I2cHandle); | |
| 91 } | |
| 92 | |
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93 static uint8_t i2c_errors = 0; |
| 38 | 94 |
| 95 void I2C_Error_count(void) | |
| 96 { | |
| 97 i2c_errors++; | |
| 98 } | |
| 99 | |
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100 |
| 38 | 101 HAL_StatusTypeDef I2C_Master_Transmit( uint16_t DevAddress, uint8_t *pData, uint16_t Size) |
| 102 { | |
| 103 if(global.I2C_SystemStatus != HAL_OK) | |
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104 return global.I2C_SystemStatus; |
| 38 | 105 |
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106 global.I2C_SystemStatus = HAL_I2C_Master_Transmit(&I2cHandle, DevAddress, pData, Size, 10); |
| 38 | 107 if(global.I2C_SystemStatus != HAL_OK) |
| 108 { | |
| 109 I2C_Error_count(); | |
| 110 } | |
| 88 | 111 |
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112 return global.I2C_SystemStatus; |
| 38 | 113 } |
| 114 | |
| 115 HAL_StatusTypeDef I2C_Master_Receive( uint16_t DevAddress, uint8_t *pData, uint16_t Size) | |
| 116 { | |
| 117 if(global.I2C_SystemStatus != HAL_OK) | |
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118 return global.I2C_SystemStatus; |
| 38 | 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) |
| 38 | 122 { |
| 123 I2C_Error_count(); | |
| 124 } | |
| 125 | |
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126 return global.I2C_SystemStatus; |
| 38 | 127 } |