Mercurial > public > ostc4
annotate Small_CPU/Src/batteryGasGauge.c @ 490:e9ca66ce36e5 v1.5.4 release
1.5.4 release
| author | heinrichsweikamp |
|---|---|
| date | Wed, 22 Jul 2020 11:55:53 +0200 |
| parents | aa286a4926c2 |
| children | 1b995079c045 |
| 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 | |
|
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31 static float battery_f_voltage = 6.0; /* max assumed voltage */ |
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32 static float battery_f_charge_percent = 0; |
| 38 | 33 |
| 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 [%] |
| 38 | 36 |
| 37 float get_voltage(void) | |
| 38 { | |
| 39 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 40 return 3.0f; | |
| 41 #endif | |
| 42 | |
| 43 return battery_f_voltage; | |
| 44 } | |
| 45 | |
| 46 | |
| 47 float get_charge(void) | |
| 48 { | |
| 49 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 50 return 100.0f; | |
| 51 #endif | |
| 52 | |
| 53 return battery_f_charge_percent; | |
| 54 } | |
| 55 | |
| 56 | |
| 57 void init_battery_gas_gauge(void) | |
| 58 { | |
| 59 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 60 return; | |
| 61 #endif | |
| 62 | |
| 63 uint8_t buffer[2]; | |
| 64 buffer[0] = 0x01; | |
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65 |
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66 // F8 = 11111000: |
| 433 | 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); |
| 38 | 73 } |
| 74 | |
| 330 | 75 uint8_t battery_gas_gauge_CheckConfigOK(void) |
| 76 { | |
| 77 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 78 return; | |
| 79 #endif | |
| 80 | |
| 81 uint8_t retval = 0; | |
| 82 uint8_t bufferReceive[10]; | |
| 83 | |
| 84 memset(bufferReceive,0,sizeof(bufferReceive)); | |
| 85 | |
| 86 I2C_Master_Receive(DEVICE_BATTERYGAUGE, bufferReceive, 10); | |
| 87 if(bufferReceive[1] == 0xf8) | |
| 88 { | |
| 89 retval = 1; | |
| 90 } | |
| 91 return retval; | |
| 92 } | |
| 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 |
| 38 | 109 |
| 110 void battery_gas_gauge_get_data(void) | |
| 111 { | |
| 112 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 113 return; | |
| 114 #endif | |
| 115 | |
| 116 float battery_f_voltage_local; | |
| 117 float battery_f_charge_percent_local; | |
| 118 | |
| 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]); |
| 433 | 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*/ |
| 131 battery_f_charge_percent_local /= BGG_BATTERY_DIVIDER; /* transform to percentage */ | |
| 38 | 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 } |
| 38 | 139 } |
| 140 | |
| 141 | |
| 142 void battery_gas_gauge_set_charge_full(void) | |
| 143 { | |
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144 disable_adc(); |
| 38 | 145 #ifdef OSTC_ON_DISCOVERY_HARDWARE |
| 146 return; | |
| 147 #endif | |
| 148 | |
| 149 uint8_t bufferSend[3]; | |
| 150 bufferSend[0] = 0x02; | |
| 151 bufferSend[1] = 0xFF; | |
| 152 bufferSend[2] = 0xFF; | |
| 153 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3); | |
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154 init_battery_gas_gauge(); |
| 38 | 155 } |
| 156 | |
| 157 | |
| 158 void battery_gas_gauge_set(float percentage) | |
| 159 { | |
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160 |
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161 disable_adc(); |
| 38 | 162 #ifdef OSTC_ON_DISCOVERY_HARDWARE |
| 163 return; | |
| 164 #endif | |
| 165 | |
| 166 uint16_t mAhSend; | |
| 167 | |
| 168 if(percentage >= 100) | |
| 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 } |
| 38 | 173 |
| 174 uint8_t bufferSend[3]; | |
| 175 bufferSend[0] = 0x02; | |
| 176 bufferSend[1] = (uint8_t)(mAhSend / 256); | |
| 177 bufferSend[2] = (uint8_t)(mAhSend & 0xFF); | |
| 178 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3); | |
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179 init_battery_gas_gauge(); |
| 38 | 180 } |
| 181 | |
| 182 | |
| 183 /************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/ |