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annotate Small_CPU/Src/batteryGasGauge.c @ 871:f7318457df4d default
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| author | heinrichsweikamp |
|---|---|
| date | Tue, 13 Aug 2024 13:24:54 +0200 |
| parents | 079bb5b22c06 |
| children |
| rev | line source |
|---|---|
| 38 | 1 /** |
| 2 ****************************************************************************** | |
| 3 * @file batteryGasGauge.c | |
| 4 * @author heinrichs weikamp gmbh | |
| 5 * @version V0.0.1 | |
| 6 * @date 09-Dec-2014 | |
| 7 * @brief LTC2942 Battery Gas Gauge | |
| 8 * | |
| 9 @verbatim | |
| 10 ============================================================================== | |
| 11 ##### stm32f4xx_hal_i2c.c modification ##### | |
| 12 ============================================================================== | |
| 13 The LTC2942 requires an repeated start condition without stop condition | |
| 14 for data reception. | |
| 15 | |
| 16 @endverbatim | |
| 17 ****************************************************************************** | |
| 18 * @attention | |
| 19 * | |
| 20 * <h2><center>© COPYRIGHT(c) 2014 heinrichs weikamp</center></h2> | |
| 21 * | |
| 22 ****************************************************************************** | |
| 23 */ | |
| 24 /* Includes ------------------------------------------------------------------*/ | |
| 330 | 25 #include <string.h> /* memset */ |
| 38 | 26 #include "batteryGasGauge.h" |
| 27 #include "baseCPU2.h" | |
| 28 #include "stm32f4xx_hal.h" | |
| 29 #include "i2c.h" | |
| 30 | |
| 662 | 31 static float battery_f_voltage = BATTERY_DEFAULT_VOLTAGE; /* max assumed voltage */ |
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32 static float battery_f_charge_percent = 0; |
| 668 | 33 static uint8_t chargeValueKnown = 0; /* indicator if the charge of the battery is known (for example after a full charge cycle) */ |
| 34 | |
| 38 | 35 |
| 36 #define BGG_BATTERY_OFFSET (26123) //; 65536-(3,35Ah/0,085mAh) | |
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37 #define BGG_BATTERY_DIVIDER (394) //; 3,35Ah/0,085mAh/100 [%] |
| 38 | 38 |
| 39 float get_voltage(void) | |
| 40 { | |
| 41 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 42 return 3.0f; | |
| 43 #endif | |
| 44 | |
| 45 return battery_f_voltage; | |
| 46 } | |
| 47 | |
| 48 | |
| 49 float get_charge(void) | |
| 50 { | |
| 51 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 52 return 100.0f; | |
| 53 #endif | |
| 54 | |
| 55 return battery_f_charge_percent; | |
| 56 } | |
| 57 | |
| 58 | |
| 59 void init_battery_gas_gauge(void) | |
| 60 { | |
| 61 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 62 return; | |
| 63 #endif | |
| 64 | |
| 65 uint8_t buffer[2]; | |
| 66 buffer[0] = 0x01; | |
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67 |
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68 // F8 = 11111000: |
| 433 | 69 // ADC auto mode (11) |
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70 // Prescale M = 128 (111) |
| 668 | 71 // AL/CC pin disable (00) |
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72 // Shutdown (0) |
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73 buffer[1] = 0xF8; |
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74 I2C_Master_Transmit(DEVICE_BATTERYGAUGE, buffer, 2); |
| 38 | 75 } |
| 76 | |
| 330 | 77 uint8_t battery_gas_gauge_CheckConfigOK(void) |
| 78 { | |
| 79 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 80 return; | |
| 81 #endif | |
| 82 | |
| 83 uint8_t retval = 0; | |
| 84 uint8_t bufferReceive[10]; | |
| 85 | |
| 86 memset(bufferReceive,0,sizeof(bufferReceive)); | |
| 87 | |
| 88 I2C_Master_Receive(DEVICE_BATTERYGAUGE, bufferReceive, 10); | |
| 89 if(bufferReceive[1] == 0xf8) | |
| 90 { | |
| 91 retval = 1; | |
| 92 } | |
| 93 return retval; | |
| 94 } | |
| 95 | |
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96 static void disable_adc(void) |
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97 { |
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98 uint8_t buffer[2]; |
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99 buffer[0] = 0x01; |
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100 |
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101 // according to the datasheet of the LTC2942, the adc shall |
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102 // be disabled when writing to the gauge registers |
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103 |
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104 // 0xF9 = 11111001: |
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105 // see init_battery_gas_gauge() |
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106 // Shutdown (1) |
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107 buffer[1] = 0xF9; |
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108 I2C_Master_Transmit(DEVICE_BATTERYGAUGE, buffer, 2); |
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109 } |
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110 |
| 38 | 111 |
| 112 void battery_gas_gauge_get_data(void) | |
| 113 { | |
| 114 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 115 return; | |
| 116 #endif | |
| 117 | |
| 118 float battery_f_voltage_local; | |
| 119 float battery_f_charge_percent_local; | |
| 120 | |
| 121 uint8_t bufferReceive[10]; | |
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122 |
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123 if(I2C_Master_Receive(DEVICE_BATTERYGAUGE, bufferReceive, 10) == HAL_OK) |
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124 { |
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125 battery_f_voltage_local = (float)(bufferReceive[8] * 256); |
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126 battery_f_voltage_local += (float)(bufferReceive[9]); |
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127 battery_f_voltage_local *= (float)6 / (float)0xFFFF; |
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128 |
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129 // max/full: 0.085 mAh * 1 * 65535 = 5570 mAh |
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130 battery_f_charge_percent_local = (float)(bufferReceive[2] * 256); |
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131 battery_f_charge_percent_local += (float)(bufferReceive[3]); |
| 433 | 132 battery_f_charge_percent_local -= BGG_BATTERY_OFFSET; /* Because of the prescalar 128 the counter assumes a max value of 5570mAh => normalize to 3350mAh*/ |
| 133 battery_f_charge_percent_local /= BGG_BATTERY_DIVIDER; /* transform to percentage */ | |
| 38 | 134 |
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135 if(battery_f_charge_percent_local < 0) |
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136 battery_f_charge_percent_local = 0; |
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137 |
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138 battery_f_voltage = battery_f_voltage_local; |
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139 battery_f_charge_percent = battery_f_charge_percent_local; |
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140 } |
| 38 | 141 } |
| 142 | |
| 143 | |
| 144 void battery_gas_gauge_set_charge_full(void) | |
| 145 { | |
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146 disable_adc(); |
| 38 | 147 #ifdef OSTC_ON_DISCOVERY_HARDWARE |
| 148 return; | |
| 149 #endif | |
| 150 | |
| 151 uint8_t bufferSend[3]; | |
| 152 bufferSend[0] = 0x02; | |
| 153 bufferSend[1] = 0xFF; | |
| 154 bufferSend[2] = 0xFF; | |
| 155 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3); | |
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156 init_battery_gas_gauge(); |
| 668 | 157 chargeValueKnown = 1; |
| 38 | 158 } |
| 159 | |
| 160 | |
| 161 void battery_gas_gauge_set(float percentage) | |
| 162 { | |
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163 |
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164 disable_adc(); |
| 38 | 165 #ifdef OSTC_ON_DISCOVERY_HARDWARE |
| 166 return; | |
| 167 #endif | |
| 168 | |
| 169 uint16_t mAhSend; | |
| 170 | |
| 171 if(percentage >= 100) | |
| 172 mAhSend = 0xFFFF; | |
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173 else { |
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174 mAhSend = (percentage * BGG_BATTERY_DIVIDER) + BGG_BATTERY_OFFSET; |
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175 } |
| 38 | 176 |
| 177 uint8_t bufferSend[3]; | |
| 178 bufferSend[0] = 0x02; | |
| 179 bufferSend[1] = (uint8_t)(mAhSend / 256); | |
| 180 bufferSend[2] = (uint8_t)(mAhSend & 0xFF); | |
| 181 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3); | |
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182 init_battery_gas_gauge(); |
| 668 | 183 chargeValueKnown = 1; |
| 38 | 184 } |
| 185 | |
| 668 | 186 uint8_t battery_gas_gauge_isChargeValueValid(void) |
| 187 { | |
| 188 return chargeValueKnown; | |
| 189 } | |
| 190 | |
| 191 void battery_gas_gauge_setChargeValueValid(void) | |
| 192 { | |
| 193 chargeValueKnown = 1; | |
| 194 } | |
| 38 | 195 |
| 196 /************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/ |