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comparison Small_CPU/Src/batteryGasGauge.c @ 38:5f11787b4f42

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include in ostc4 repository
author heinrichsweikamp
date Sat, 28 Apr 2018 11:52:34 +0200
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children f9ba924d188e
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37:ccc45c0e1ea2 38:5f11787b4f42
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>&copy; 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
30 float battery_f_voltage = 0;
31 float battery_f_charge_percent = 0;
32
33 #define BGG_BATTERY_OFFSET (26123) //; 65536-(3,35Ah/0,085mAh)
34 #define BGG_BATTERY_DEVIDER (394) //; 3,35Ah/0,085mAh/100 [%]
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;
64 buffer[1] = 0xF8;// true: F8 = 11111000, wrong/old comment: 11101000
65 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, buffer, 2);
66 }
67
68
69 void battery_gas_gauge_get_data(void)
70 {
71 #ifdef OSTC_ON_DISCOVERY_HARDWARE
72 return;
73 #endif
74
75 float battery_f_voltage_local;
76 float battery_f_charge_percent_local;
77
78 uint8_t bufferReceive[10];
79 I2C_Master_Receive( DEVICE_BATTERYGAUGE, bufferReceive, 10);
80
81 battery_f_voltage_local = (float)(bufferReceive[8] * 256);
82 battery_f_voltage_local += (float)(bufferReceive[9]);
83 battery_f_voltage_local *= (float)6 / (float)0xFFFF;
84
85 // max/full: 0.085 mAh * 1 * 65535 = 5570 mAh
86 battery_f_charge_percent_local = (float)(bufferReceive[2] * 256);
87 battery_f_charge_percent_local += (float)(bufferReceive[3]);
88 battery_f_charge_percent_local -= BGG_BATTERY_OFFSET;
89 battery_f_charge_percent_local /= BGG_BATTERY_DEVIDER;
90
91 if(battery_f_charge_percent_local < 0)
92 battery_f_charge_percent_local = 0;
93
94 battery_f_voltage = battery_f_voltage_local;
95 battery_f_charge_percent = battery_f_charge_percent_local;
96 }
97
98
99 void battery_gas_gauge_set_charge_full(void)
100 {
101 #ifdef OSTC_ON_DISCOVERY_HARDWARE
102 return;
103 #endif
104
105 uint8_t bufferSend[3];
106 bufferSend[0] = 0x02;
107 bufferSend[1] = 0xFF;
108 bufferSend[2] = 0xFF;
109 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3);
110 }
111
112
113 void battery_gas_gauge_set(float percentage)
114 {
115 #ifdef OSTC_ON_DISCOVERY_HARDWARE
116 return;
117 #endif
118
119 uint16_t mAhSend;
120
121 if(percentage >= 100)
122 mAhSend = 0xFFFF;
123 else
124 mAhSend = (uint16_t)(percentage * 655.35f);
125
126 uint8_t bufferSend[3];
127 bufferSend[0] = 0x02;
128 bufferSend[1] = (uint8_t)(mAhSend / 256);
129 bufferSend[2] = (uint8_t)(mAhSend & 0xFF);
130 I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3);
131 }
132
133
134 /************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/