Mercurial > public > ostc4
view Small_CPU/Src/batteryGasGauge.c @ 423:a560afdaadbf ImprovmentNVM_2
ext_Flash_write_sample erase sector optimization:
The previous function erased a sector while writing sample data causing a delay of up to 200ms. The new implementation checks at the end of a write sample call if we are close to a sector end. In case we are a erase sector command will be send to the flash for the next sector. At the time of the next sample write (2 seconds later) the next sector is already erased and no busy wait of 200ms is needed => max write time for samples is not less than 5ms.
author | ideenmodellierer |
---|---|
date | Mon, 10 Feb 2020 19:40:33 +0100 |
parents | 2fc08a0d1ec3 |
children | aa286a4926c2 |
line wrap: on
line source
/** ****************************************************************************** * @file batteryGasGauge.c * @author heinrichs weikamp gmbh * @version V0.0.1 * @date 09-Dec-2014 * @brief LTC2942 Battery Gas Gauge * @verbatim ============================================================================== ##### stm32f4xx_hal_i2c.c modification ##### ============================================================================== The LTC2942 requires an repeated start condition without stop condition for data reception. @endverbatim ****************************************************************************** * @attention * * <h2><center>© COPYRIGHT(c) 2014 heinrichs weikamp</center></h2> * ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include <string.h> /* memset */ #include "batteryGasGauge.h" #include "baseCPU2.h" #include "stm32f4xx_hal.h" #include "i2c.h" static float battery_f_voltage = 6.0; /* max assumed voltage */ static float battery_f_charge_percent = 0; #define BGG_BATTERY_OFFSET (26123) //; 65536-(3,35Ah/0,085mAh) #define BGG_BATTERY_DIVIDER (394) //; 3,35Ah/0,085mAh/100 [%] float get_voltage(void) { #ifdef OSTC_ON_DISCOVERY_HARDWARE return 3.0f; #endif return battery_f_voltage; } float get_charge(void) { #ifdef OSTC_ON_DISCOVERY_HARDWARE return 100.0f; #endif return battery_f_charge_percent; } void init_battery_gas_gauge(void) { #ifdef OSTC_ON_DISCOVERY_HARDWARE return; #endif uint8_t buffer[2]; buffer[0] = 0x01; // F8 = 11111000: // Vbat 3.0V (11) // Prescale M = 128 (111) // AL/CC pin disable (0) // Shutdown (0) buffer[1] = 0xF8; I2C_Master_Transmit(DEVICE_BATTERYGAUGE, buffer, 2); } uint8_t battery_gas_gauge_CheckConfigOK(void) { #ifdef OSTC_ON_DISCOVERY_HARDWARE return; #endif uint8_t retval = 0; uint8_t bufferReceive[10]; memset(bufferReceive,0,sizeof(bufferReceive)); I2C_Master_Receive(DEVICE_BATTERYGAUGE, bufferReceive, 10); if(bufferReceive[1] == 0xf8) { retval = 1; } return retval; } static void disable_adc(void) { uint8_t buffer[2]; buffer[0] = 0x01; // according to the datasheet of the LTC2942, the adc shall // be disabled when writing to the gauge registers // 0xF9 = 11111001: // see init_battery_gas_gauge() // Shutdown (1) buffer[1] = 0xF9; I2C_Master_Transmit(DEVICE_BATTERYGAUGE, buffer, 2); } void battery_gas_gauge_get_data(void) { #ifdef OSTC_ON_DISCOVERY_HARDWARE return; #endif float battery_f_voltage_local; float battery_f_charge_percent_local; uint8_t bufferReceive[10]; if(I2C_Master_Receive(DEVICE_BATTERYGAUGE, bufferReceive, 10) == HAL_OK) { battery_f_voltage_local = (float)(bufferReceive[8] * 256); battery_f_voltage_local += (float)(bufferReceive[9]); battery_f_voltage_local *= (float)6 / (float)0xFFFF; // max/full: 0.085 mAh * 1 * 65535 = 5570 mAh battery_f_charge_percent_local = (float)(bufferReceive[2] * 256); battery_f_charge_percent_local += (float)(bufferReceive[3]); battery_f_charge_percent_local -= BGG_BATTERY_OFFSET; battery_f_charge_percent_local /= BGG_BATTERY_DIVIDER; if(battery_f_charge_percent_local < 0) battery_f_charge_percent_local = 0; battery_f_voltage = battery_f_voltage_local; battery_f_charge_percent = battery_f_charge_percent_local; } } void battery_gas_gauge_set_charge_full(void) { disable_adc(); #ifdef OSTC_ON_DISCOVERY_HARDWARE return; #endif uint8_t bufferSend[3]; bufferSend[0] = 0x02; bufferSend[1] = 0xFF; bufferSend[2] = 0xFF; I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3); init_battery_gas_gauge(); } void battery_gas_gauge_set(float percentage) { disable_adc(); #ifdef OSTC_ON_DISCOVERY_HARDWARE return; #endif uint16_t mAhSend; if(percentage >= 100) mAhSend = 0xFFFF; else { mAhSend = (percentage * BGG_BATTERY_DIVIDER) + BGG_BATTERY_OFFSET; } uint8_t bufferSend[3]; bufferSend[0] = 0x02; bufferSend[1] = (uint8_t)(mAhSend / 256); bufferSend[2] = (uint8_t)(mAhSend & 0xFF); I2C_Master_Transmit( DEVICE_BATTERYGAUGE, bufferSend, 3); init_battery_gas_gauge(); } /************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/