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annotate Small_CPU/Src/batteryGasGauge.c @ 662:1b995079c045 Betatest

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author heinrichs weikamp
date Tue, 14 Dec 2021 15:36:10 +0100
parents aa286a4926c2
children 079bb5b22c06
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1 /**
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2 ******************************************************************************
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3 * @file batteryGasGauge.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 09-Dec-2014
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7 * @brief LTC2942 Battery Gas Gauge
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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>&copy; 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 #include <string.h> /* memset */
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26 #include "batteryGasGauge.h"
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27 #include "baseCPU2.h"
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28 #include "stm32f4xx_hal.h"
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29 #include "i2c.h"
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30
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31 static float battery_f_voltage = BATTERY_DEFAULT_VOLTAGE; /* max assumed voltage */
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32 static float battery_f_charge_percent = 0;
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33
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34 #define BGG_BATTERY_OFFSET (26123) //; 65536-(3,35Ah/0,085mAh)
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35 #define BGG_BATTERY_DIVIDER (394) //; 3,35Ah/0,085mAh/100 [%]
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36
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37 float get_voltage(void)
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38 {
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39 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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40 return 3.0f;
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41 #endif
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42
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43 return battery_f_voltage;
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44 }
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45
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46
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47 float get_charge(void)
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48 {
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49 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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50 return 100.0f;
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51 #endif
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52
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53 return battery_f_charge_percent;
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54 }
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55
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56
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57 void init_battery_gas_gauge(void)
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58 {
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59 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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60 return;
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61 #endif
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62
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63 uint8_t buffer[2];
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64 buffer[0] = 0x01;
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65
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66 // F8 = 11111000:
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67 // ADC auto mode (11)
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68 // Prescale M = 128 (111)
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69 // AL/CC pin disable (0)
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70 // Shutdown (0)
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71 buffer[1] = 0xF8;
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72 I2C_Master_Transmit(DEVICE_BATTERYGAUGE, buffer, 2);
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73 }
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74
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75 uint8_t battery_gas_gauge_CheckConfigOK(void)
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76 {
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77 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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78 return;
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79 #endif
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80
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81 uint8_t retval = 0;
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82 uint8_t bufferReceive[10];
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83
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84 memset(bufferReceive,0,sizeof(bufferReceive));
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85
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86 I2C_Master_Receive(DEVICE_BATTERYGAUGE, bufferReceive, 10);
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87 if(bufferReceive[1] == 0xf8)
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88 {
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89 retval = 1;
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90 }
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91 return retval;
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92 }
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93
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94 static void disable_adc(void)
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95 {
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96 uint8_t buffer[2];
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97 buffer[0] = 0x01;
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98
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99 // according to the datasheet of the LTC2942, the adc shall
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100 // be disabled when writing to the gauge registers
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101
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102 // 0xF9 = 11111001:
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103 // see init_battery_gas_gauge()
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104 // Shutdown (1)
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105 buffer[1] = 0xF9;
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106 I2C_Master_Transmit(DEVICE_BATTERYGAUGE, buffer, 2);
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107 }
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108
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109
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110 void battery_gas_gauge_get_data(void)
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111 {
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112 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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113 return;
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114 #endif
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115
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116 float battery_f_voltage_local;
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117 float battery_f_charge_percent_local;
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118
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119 uint8_t bufferReceive[10];
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120
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121 if(I2C_Master_Receive(DEVICE_BATTERYGAUGE, bufferReceive, 10) == HAL_OK)
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122 {
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123 battery_f_voltage_local = (float)(bufferReceive[8] * 256);
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124 battery_f_voltage_local += (float)(bufferReceive[9]);
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125 battery_f_voltage_local *= (float)6 / (float)0xFFFF;
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126
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127 // max/full: 0.085 mAh * 1 * 65535 = 5570 mAh
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128 battery_f_charge_percent_local = (float)(bufferReceive[2] * 256);
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129 battery_f_charge_percent_local += (float)(bufferReceive[3]);
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130 battery_f_charge_percent_local -= BGG_BATTERY_OFFSET; /* Because of the prescalar 128 the counter assumes a max value of 5570mAh => normalize to 3350mAh*/
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131 battery_f_charge_percent_local /= BGG_BATTERY_DIVIDER; /* transform to percentage */
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132
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133 if(battery_f_charge_percent_local < 0)
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134 battery_f_charge_percent_local = 0;
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135
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136 battery_f_voltage = battery_f_voltage_local;
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137 battery_f_charge_percent = battery_f_charge_percent_local;
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138 }
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139 }
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140
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141
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142 void battery_gas_gauge_set_charge_full(void)
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143 {
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144 disable_adc();
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145 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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146 return;
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147 #endif
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148
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149 uint8_t bufferSend[3];
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150 bufferSend[0] = 0x02;
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151 bufferSend[1] = 0xFF;
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152 bufferSend[2] = 0xFF;
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153 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3);
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154 init_battery_gas_gauge();
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155 }
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157
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158 void battery_gas_gauge_set(float percentage)
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159 {
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160
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161 disable_adc();
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162 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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163 return;
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164 #endif
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165
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166 uint16_t mAhSend;
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167
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168 if(percentage >= 100)
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169 mAhSend = 0xFFFF;
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170 else {
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171 mAhSend = (percentage * BGG_BATTERY_DIVIDER) + BGG_BATTERY_OFFSET;
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172 }
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174 uint8_t bufferSend[3];
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175 bufferSend[0] = 0x02;
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176 bufferSend[1] = (uint8_t)(mAhSend / 256);
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177 bufferSend[2] = (uint8_t)(mAhSend & 0xFF);
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178 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3);
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179 init_battery_gas_gauge();
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180 }
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183 /************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/