Mercurial > public > ostc4
annotate Small_CPU/Src/externalInterface.c @ 588:b1c489b503b9
Update current build, "RTErequired" value and release date
author | heinrichsweikamp |
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date | Thu, 17 Dec 2020 09:52:12 +0100 |
parents | 011d8f9f5ddb |
children | 1b995079c045 |
rev | line source |
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1 /** |
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2 ****************************************************************************** |
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3 * @file externalInterface.c |
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4 * @author heinrichs weikamp gmbh |
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5 * @version V0.0.1 |
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6 * @date 07-Nov-2020 |
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7 * @brief Interface functionality to proceed external analog signal via i2c connection |
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8 * |
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9 @verbatim |
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10 ============================================================================== |
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11 ##### stm32f4xx_hal_i2c.c modification ##### |
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12 ============================================================================== |
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13 The LTC2942 requires an repeated start condition without stop condition |
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14 for data reception. |
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15 |
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16 @endverbatim |
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17 ****************************************************************************** |
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18 * @attention |
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19 * |
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20 * <h2><center>© COPYRIGHT(c) 2014 heinrichs weikamp</center></h2> |
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21 * |
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22 ****************************************************************************** |
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23 */ |
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24 /* Includes ------------------------------------------------------------------*/ |
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25 |
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26 #include <math.h> |
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27 #include "i2c.h" |
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28 #include "externalInterface.h" |
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29 #include "scheduler.h" |
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30 |
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31 extern SGlobal global; |
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32 |
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33 #define ADC_ANSWER_LENGTH (5u) /* 3424 will provide addr + 4 data bytes */ |
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34 #define ADC_TIMEOUT (10u) /* conversion stuck for unknown reason => restart */ |
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35 #define ADC_REF_VOLTAGE_MV (2048.0f) /* reference voltage of MPC3424*/ |
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36 |
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37 #define ADC_START_CONVERSION (0x80) |
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38 #define ADC_GAIN_4 (0x02) |
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39 #define ADC_GAIN_4_VALUE (4.0f) |
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40 #define ADC_GAIN_8 (0x03) |
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41 #define ADC_GAIN_8_VALUE (8.0f) |
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42 #define ADC_RESOLUTION_16BIT (0x08) |
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43 #define ADC_RESOLUTION_16BIT_VALUE (16u) |
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44 #define ADC_RESOLUTION_18BIT (0x0C) |
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45 #define ADC_RESOLUTION_18BIT_VALUE (18u) |
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46 |
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47 #define ANSWER_CONFBYTE_INDEX (4u) |
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48 |
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49 static uint8_t activeChannel = 0; /* channel which is in request */ |
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50 static uint8_t recBuf[ADC_ANSWER_LENGTH]; |
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51 static uint8_t timeoutCnt = 0; |
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52 static uint8_t externalInterfacePresent = 0; |
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53 |
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54 float externalChannel_mV[MAX_ADC_CHANNEL]; |
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55 |
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56 |
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57 void externalInterface_Init(void) |
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58 { |
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59 activeChannel = 0; |
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60 timeoutCnt = 0; |
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61 externalInterfacePresent = 0; |
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62 if(externalInterface_StartConversion(activeChannel) == HAL_OK) |
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63 { |
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64 externalInterfacePresent = 1; |
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65 global.deviceDataSendToMaster.hw_Info.extADC = 1; |
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66 } |
559 | 67 global.deviceDataSendToMaster.hw_Info.checkADC = 1; |
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68 } |
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69 |
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70 |
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71 uint8_t externalInterface_StartConversion(uint8_t channel) |
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72 { |
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73 uint8_t retval = 0; |
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74 uint8_t confByte = 0; |
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75 |
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76 if(channel < MAX_ADC_CHANNEL) |
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77 { |
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78 confByte = ADC_START_CONVERSION | ADC_RESOLUTION_16BIT | ADC_GAIN_8; |
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79 confByte |= channel << 5; |
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80 retval = I2C_Master_Transmit(DEVICE_EXTERNAL_ADC, &confByte, 1); |
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81 } |
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82 return retval; |
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83 } |
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84 |
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85 /* Check if conversion is done and trigger measurement of next channel */ |
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86 uint8_t externalInterface_ReadAndSwitch() |
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87 { |
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88 uint8_t retval = EXTERNAL_ADC_NO_DATA; |
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89 |
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90 if(externalInterfacePresent) |
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91 { |
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92 if(I2C_Master_Receive(DEVICE_EXTERNAL_ADC, recBuf, ADC_ANSWER_LENGTH) == HAL_OK) |
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93 { |
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94 if((recBuf[ANSWER_CONFBYTE_INDEX] & ADC_START_CONVERSION) == 0) /* !ready set => received data contains new value */ |
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95 { |
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96 retval = activeChannel; /* return channel number providing new data */ |
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97 activeChannel++; |
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98 if(activeChannel == MAX_ADC_CHANNEL) |
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99 { |
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100 activeChannel = 0; |
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101 } |
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102 externalInterface_StartConversion(activeChannel); |
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103 timeoutCnt = 0; |
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104 } |
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105 else |
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106 { |
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107 if(timeoutCnt++ >= ADC_TIMEOUT) |
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108 { |
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109 externalInterface_StartConversion(activeChannel); |
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110 timeoutCnt = 0; |
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111 } |
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112 } |
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113 } |
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114 else /* take also i2c bus disturb into account */ |
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115 { |
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116 if(timeoutCnt++ >= ADC_TIMEOUT) |
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117 { |
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118 externalInterface_StartConversion(activeChannel); |
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119 timeoutCnt = 0; |
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120 } |
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121 } |
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122 } |
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123 return retval; |
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124 } |
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125 float externalInterface_CalculateADCValue(uint8_t channel) |
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126 { |
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127 int32_t rawvalue = 0; |
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128 float retValue = 0.0; |
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129 if(channel < MAX_ADC_CHANNEL) |
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130 { |
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131 |
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132 rawvalue = ((recBuf[0] << 16) | (recBuf[1] << 8) | (recBuf[2])); |
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133 |
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134 switch(recBuf[3] & 0x0C) /* confbyte => Resolution bits*/ |
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135 { |
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136 case ADC_RESOLUTION_16BIT: rawvalue = rawvalue >> 8; /* only 2 databytes received shift out confbyte*/ |
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137 if(rawvalue & (0x1 << (ADC_RESOLUTION_16BIT_VALUE-1))) /* MSB set => negative number */ |
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138 { |
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139 rawvalue |= 0xFFFF0000; /* set MSB for int32 */ |
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140 } |
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141 else |
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142 { |
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143 rawvalue &= 0x0000FFFF; |
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144 } |
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145 externalChannel_mV[channel] = ADC_REF_VOLTAGE_MV * 2.0 / (float) pow(2,ADC_RESOLUTION_16BIT_VALUE); /* calculate bit resolution */ |
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146 break; |
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147 case ADC_RESOLUTION_18BIT: if(rawvalue & (0x1 << (ADC_RESOLUTION_18BIT_VALUE-1))) /* MSB set => negative number */ |
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148 { |
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149 rawvalue |= 0xFFFE0000; /* set MSB for int32 */ |
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150 } |
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151 externalChannel_mV[channel] = ADC_REF_VOLTAGE_MV * 2.0 / (float) pow(2,ADC_RESOLUTION_18BIT_VALUE); /* calculate bit resolution */ |
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152 break; |
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153 default: rawvalue = 0; |
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154 break; |
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155 } |
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156 externalChannel_mV[channel] = externalChannel_mV[channel] * rawvalue / ADC_GAIN_8_VALUE; |
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157 retValue = externalChannel_mV[channel]; |
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158 } |
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159 return retValue; |
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160 } |
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161 float getExternalInterfaceChannel(uint8_t channel) |
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162 { |
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163 float retval = 0; |
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164 |
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165 if(channel < MAX_ADC_CHANNEL) |
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166 { |
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167 retval = externalChannel_mV[channel]; |
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168 } |
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169 return retval; |
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170 } |