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38
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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>© 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 float battery_f_voltage = 0;
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31 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_DEVIDER (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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44
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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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54
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55
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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 buffer[1] = 0xF8;// true: F8 = 11111000, wrong/old comment: 11101000
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65 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, buffer, 2);
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66 }
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67
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68
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69 void battery_gas_gauge_get_data(void)
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70 {
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71 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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72 return;
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73 #endif
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74
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75 float battery_f_voltage_local;
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76 float battery_f_charge_percent_local;
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77
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78 uint8_t bufferReceive[10];
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79 I2C_Master_Receive( DEVICE_BATTERYGAUGE, bufferReceive, 10);
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80
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81 battery_f_voltage_local = (float)(bufferReceive[8] * 256);
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82 battery_f_voltage_local += (float)(bufferReceive[9]);
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83 battery_f_voltage_local *= (float)6 / (float)0xFFFF;
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84
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85 // max/full: 0.085 mAh * 1 * 65535 = 5570 mAh
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86 battery_f_charge_percent_local = (float)(bufferReceive[2] * 256);
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87 battery_f_charge_percent_local += (float)(bufferReceive[3]);
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88 battery_f_charge_percent_local -= BGG_BATTERY_OFFSET;
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89 battery_f_charge_percent_local /= BGG_BATTERY_DEVIDER;
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90
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91 if(battery_f_charge_percent_local < 0)
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92 battery_f_charge_percent_local = 0;
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93
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94 battery_f_voltage = battery_f_voltage_local;
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95 battery_f_charge_percent = battery_f_charge_percent_local;
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96 }
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97
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98
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99 void battery_gas_gauge_set_charge_full(void)
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100 {
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101 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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102 return;
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103 #endif
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104
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105 uint8_t bufferSend[3];
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106 bufferSend[0] = 0x02;
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107 bufferSend[1] = 0xFF;
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108 bufferSend[2] = 0xFF;
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109 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3);
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110 }
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111
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112
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113 void battery_gas_gauge_set(float percentage)
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114 {
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115 #ifdef OSTC_ON_DISCOVERY_HARDWARE
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116 return;
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117 #endif
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118
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119 uint16_t mAhSend;
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120
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121 if(percentage >= 100)
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122 mAhSend = 0xFFFF;
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123 else
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124 mAhSend = (uint16_t)(percentage * 655.35f);
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125
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126 uint8_t bufferSend[3];
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127 bufferSend[0] = 0x02;
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128 bufferSend[1] = (uint8_t)(mAhSend / 256);
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129 bufferSend[2] = (uint8_t)(mAhSend & 0xFF);
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130 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3);
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131 }
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132
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133
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134 /************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/
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