Mercurial > public > ostc4
annotate Small_CPU/Src/batteryGasGauge.c @ 780:e40790a67165
Discovery<=>SmallCPU inferface update:
The sensor data struct is extended to store the data of up to three (three visible O2 sensors). To avoid unnecessary payload on the SPI only the last update sensor data item is transfered. The sender receiver uses the sensor ID which is provided in parallel to identify the correct storage location.
| author | Ideenmodellierer |
|---|---|
| date | Tue, 23 May 2023 21:50:19 +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****/ |