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annotate Small_CPU/Src/batteryGasGauge.c @ 242:b23de15e2861 div-fixes-5

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Comply to datasheet when resetting battery gauge registers According to the datasheet of the LTC2942, the adc shall be disabled when writing to the gauge registers. Simply provide a function for this and use it. And no, it does not seem to fix anything, but its simply better to follow the datasheet. Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>
author Jan Mulder <jlmulder@xs4all.nl>
date Mon, 08 Apr 2019 12:02:07 +0200
parents f9ba924d188e
children 2defc8cd93ce
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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 "batteryGasGauge.h"
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26 #include "baseCPU2.h"
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27 #include "stm32f4xx_hal.h"
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28 #include "i2c.h"
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29
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30 static float battery_f_voltage = 0;
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31 static float battery_f_charge_percent = 0;
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32
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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 [%]
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35
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36 float get_voltage(void)
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37 {
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38 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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39 return 3.0f;
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40 #endif
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41
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42 return battery_f_voltage;
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43 }
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45
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46 float get_charge(void)
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47 {
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48 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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49 return 100.0f;
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50 #endif
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51
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52 return battery_f_charge_percent;
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53 }
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56 void init_battery_gas_gauge(void)
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57 {
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58 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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59 return;
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60 #endif
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61
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62 uint8_t buffer[2];
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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);
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72 }
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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
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89
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90 void battery_gas_gauge_get_data(void)
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91 {
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92 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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93 return;
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94 #endif
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95
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96 float battery_f_voltage_local;
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97 float battery_f_charge_percent_local;
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98
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99 uint8_t bufferReceive[10];
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100 I2C_Master_Receive( DEVICE_BATTERYGAUGE, bufferReceive, 10);
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101
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102 battery_f_voltage_local = (float)(bufferReceive[8] * 256);
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103 battery_f_voltage_local += (float)(bufferReceive[9]);
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104 battery_f_voltage_local *= (float)6 / (float)0xFFFF;
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105
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106 // max/full: 0.085 mAh * 1 * 65535 = 5570 mAh
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107 battery_f_charge_percent_local = (float)(bufferReceive[2] * 256);
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108 battery_f_charge_percent_local += (float)(bufferReceive[3]);
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109 battery_f_charge_percent_local -= BGG_BATTERY_OFFSET;
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110 battery_f_charge_percent_local /= BGG_BATTERY_DIVIDER;
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111
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112 if(battery_f_charge_percent_local < 0)
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113 battery_f_charge_percent_local = 0;
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114
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115 battery_f_voltage = battery_f_voltage_local;
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116 battery_f_charge_percent = battery_f_charge_percent_local;
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117 }
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118
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119
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120 void battery_gas_gauge_set_charge_full(void)
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121 {
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122 disable_adc();
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123 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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124 return;
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125 #endif
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126
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127 uint8_t bufferSend[3];
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128 bufferSend[0] = 0x02;
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129 bufferSend[1] = 0xFF;
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130 bufferSend[2] = 0xFF;
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131 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3);
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132 init_battery_gas_gauge();
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133 }
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134
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135
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136 void battery_gas_gauge_set(float percentage)
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137 {
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138
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139 disable_adc();
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140 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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141 return;
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142 #endif
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143
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144 uint16_t mAhSend;
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145
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146 if(percentage >= 100)
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147 mAhSend = 0xFFFF;
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148 else {
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149 mAhSend = (percentage * BGG_BATTERY_DIVIDER) + BGG_BATTERY_OFFSET;
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150 }
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151
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152 uint8_t bufferSend[3];
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153 bufferSend[0] = 0x02;
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154 bufferSend[1] = (uint8_t)(mAhSend / 256);
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155 bufferSend[2] = (uint8_t)(mAhSend & 0xFF);
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156 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3);
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157 init_battery_gas_gauge();
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158 }
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161 /************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/