Mercurial > public > ostc4
annotate Small_CPU/Src/batteryGasGauge.c @ 322:31e471d60797 O2_SensorSync
Added start of frame detection for HUD data
In the previous impmenentation the reception and evaluation of 15 byte were used without start detection. As a result sensor data could be stuck in case the frame sequence does not match the structure (e.g. cause by an framing error).
To resolve this in case of an invalid checksumme in combination with a data lost detection a byte based reception is startet to detect the start of a frame using the break between two transmissions.
In addition a babbling idiot protecting has been added because a faulty hardware could have an impact on the OSTC operation (high interrupt load)
| author | ideenmodellierer |
|---|---|
| date | Sun, 30 Jun 2019 21:25:58 +0200 |
| parents | b23de15e2861 |
| children | 2defc8cd93ce |
| 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 ------------------------------------------------------------------*/ | |
| 25 #include "batteryGasGauge.h" | |
| 26 #include "baseCPU2.h" | |
| 27 #include "stm32f4xx_hal.h" | |
| 28 #include "i2c.h" | |
| 29 | |
|
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30 static float battery_f_voltage = 0; |
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31 static float battery_f_charge_percent = 0; |
| 38 | 32 |
| 33 #define BGG_BATTERY_OFFSET (26123) //; 65536-(3,35Ah/0,085mAh) | |
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34 #define BGG_BATTERY_DIVIDER (394) //; 3,35Ah/0,085mAh/100 [%] |
| 38 | 35 |
| 36 float get_voltage(void) | |
| 37 { | |
| 38 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 39 return 3.0f; | |
| 40 #endif | |
| 41 | |
| 42 return battery_f_voltage; | |
| 43 } | |
| 44 | |
| 45 | |
| 46 float get_charge(void) | |
| 47 { | |
| 48 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 49 return 100.0f; | |
| 50 #endif | |
| 51 | |
| 52 return battery_f_charge_percent; | |
| 53 } | |
| 54 | |
| 55 | |
| 56 void init_battery_gas_gauge(void) | |
| 57 { | |
| 58 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 59 return; | |
| 60 #endif | |
| 61 | |
| 62 uint8_t buffer[2]; | |
| 63 buffer[0] = 0x01; | |
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64 |
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65 // F8 = 11111000: |
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66 // Vbat 3.0V (11) |
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67 // Prescale M = 128 (111) |
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68 // AL/CC pin disable (0) |
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69 // Shutdown (0) |
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70 buffer[1] = 0xF8; |
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71 I2C_Master_Transmit(DEVICE_BATTERYGAUGE, buffer, 2); |
| 38 | 72 } |
| 73 | |
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74 static void disable_adc(void) |
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75 { |
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76 uint8_t buffer[2]; |
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77 buffer[0] = 0x01; |
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78 |
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79 // according to the datasheet of the LTC2942, the adc shall |
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80 // be disabled when writing to the gauge registers |
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81 |
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82 // 0xF9 = 11111001: |
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83 // see init_battery_gas_gauge() |
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84 // Shutdown (1) |
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85 buffer[1] = 0xF9; |
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86 I2C_Master_Transmit(DEVICE_BATTERYGAUGE, buffer, 2); |
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87 } |
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88 |
| 38 | 89 |
| 90 void battery_gas_gauge_get_data(void) | |
| 91 { | |
| 92 #ifdef OSTC_ON_DISCOVERY_HARDWARE | |
| 93 return; | |
| 94 #endif | |
| 95 | |
| 96 float battery_f_voltage_local; | |
| 97 float battery_f_charge_percent_local; | |
| 98 | |
| 99 uint8_t bufferReceive[10]; | |
| 100 I2C_Master_Receive( DEVICE_BATTERYGAUGE, bufferReceive, 10); | |
| 101 | |
| 102 battery_f_voltage_local = (float)(bufferReceive[8] * 256); | |
| 103 battery_f_voltage_local += (float)(bufferReceive[9]); | |
| 104 battery_f_voltage_local *= (float)6 / (float)0xFFFF; | |
| 105 | |
| 106 // max/full: 0.085 mAh * 1 * 65535 = 5570 mAh | |
| 107 battery_f_charge_percent_local = (float)(bufferReceive[2] * 256); | |
| 108 battery_f_charge_percent_local += (float)(bufferReceive[3]); | |
| 109 battery_f_charge_percent_local -= BGG_BATTERY_OFFSET; | |
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f9ba924d188e
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parents:
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diff
changeset
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110 battery_f_charge_percent_local /= BGG_BATTERY_DIVIDER; |
| 38 | 111 |
| 112 if(battery_f_charge_percent_local < 0) | |
| 113 battery_f_charge_percent_local = 0; | |
| 114 | |
| 115 battery_f_voltage = battery_f_voltage_local; | |
| 116 battery_f_charge_percent = battery_f_charge_percent_local; | |
| 117 } | |
| 118 | |
| 119 | |
| 120 void battery_gas_gauge_set_charge_full(void) | |
| 121 { | |
|
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122 disable_adc(); |
| 38 | 123 #ifdef OSTC_ON_DISCOVERY_HARDWARE |
| 124 return; | |
| 125 #endif | |
| 126 | |
| 127 uint8_t bufferSend[3]; | |
| 128 bufferSend[0] = 0x02; | |
| 129 bufferSend[1] = 0xFF; | |
| 130 bufferSend[2] = 0xFF; | |
| 131 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3); | |
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132 init_battery_gas_gauge(); |
| 38 | 133 } |
| 134 | |
| 135 | |
| 136 void battery_gas_gauge_set(float percentage) | |
| 137 { | |
|
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138 |
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139 disable_adc(); |
| 38 | 140 #ifdef OSTC_ON_DISCOVERY_HARDWARE |
| 141 return; | |
| 142 #endif | |
| 143 | |
| 144 uint16_t mAhSend; | |
| 145 | |
| 146 if(percentage >= 100) | |
| 147 mAhSend = 0xFFFF; | |
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148 else { |
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f9ba924d188e
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parents:
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149 mAhSend = (percentage * BGG_BATTERY_DIVIDER) + BGG_BATTERY_OFFSET; |
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parents:
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150 } |
| 38 | 151 |
| 152 uint8_t bufferSend[3]; | |
| 153 bufferSend[0] = 0x02; | |
| 154 bufferSend[1] = (uint8_t)(mAhSend / 256); | |
| 155 bufferSend[2] = (uint8_t)(mAhSend & 0xFF); | |
| 156 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3); | |
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157 init_battery_gas_gauge(); |
| 38 | 158 } |
| 159 | |
| 160 | |
| 161 /************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/ |