Initial commit

Core/Src/BQ_Abstraction_Layer.c

@@ -0,0 +1,167 @@
+/*
+ * BQ_Abstraction_Layer.c
+ *
+ *  Created on: 29.01.2022
+ *      Author: max
+ */
+
+#include "BQ_Abstraction_Layer.h"
+#include "BQ_Communication.h"
+#include "BQ_Register_Definitions.h"
+#include "stm32f4xx_hal.h"
+
+uint16_t cell_voltages[N_CELLS];
+
+uint8_t bq_status;
+uint32_t lastmeasurementtime;
+
+void afe_init(UART_HandleTypeDef* uarthandle)
+{
+	//Initialise underlying BQ Communication Functions
+	init_BQCom(uarthandle);
+
+	//Turn the AFE on off on to cycle a full reset
+	afe_wakeup();
+	HAL_Delay(10);
+	afe_shutdown();
+	HAL_Delay(100);
+	afe_wakeup();
+	HAL_Delay(10);
+
+	bq_status = BQ_INIT_PHASE;
+
+	afe_config_communication();
+	afe_config_measurement_channels();
+
+	afe_config_gpios();
+	afe_activate_LED();
+
+	afe_init_fault_thresholds();
+
+	HAL_Delay(1000);
+
+	afe_update_Checksum();
+
+	afe_clear_all_faults();
+
+	HAL_Delay(10);
+
+	afe_check_faults();
+
+}
+
+void afe_shutdown()
+{
+	BQ_Write_Register(DEV_CNTRL, DEV_CNTRL_SIZE, 0x40);
+}
+
+void afe_wakeup()
+{
+	HAL_GPIO_WritePin(WAKEUP_PORT, WAKEUP_PIN, GPIO_PIN_SET);
+	HAL_Delay(1);
+	HAL_GPIO_WritePin(WAKEUP_PORT, WAKEUP_PIN, GPIO_PIN_RESET);
+}
+
+void afe_measure()
+{
+	uint8_t cellvoltagebuffer[2*N_CELLS];
+	uint8_t retval = BQ_ReadMeasurements(cellvoltagebuffer, 2*N_CELLS);
+
+	lastmeasurementtime = HAL_GetTick();
+
+	if(retval == 0)
+	{
+		bq_status = BQ_ERROR;
+	}
+	else
+	{
+
+		for(int n = 0; n < N_CELLS; n++)
+			{
+				cell_voltages[N_CELLS-1-n] = (uint16_t) (cellvoltagebuffer[2*n]<<8) + (uint16_t) cellvoltagebuffer[2*n+1];
+			}
+	}
+}
+
+void afe_selftest()
+{
+
+}
+
+void afe_check_faults()
+{
+	uint32_t faultflags = 0;
+	BQ_Read_Register(FAULT_SUM, FAULT_SUM_SIZE, &faultflags);
+
+	if(faultflags != 0)
+	{
+		bq_status = BQ_ERROR;
+	}
+}
+
+void afe_clear_all_faults()
+{
+	BQ_Write_Register(FAULT_SUM, FAULT_SUM_SIZE, 0xFFC0); //Clear all Faults
+	bq_status = BQ_STDBY;
+	HAL_Delay(1);
+	afe_check_faults();
+	if(bq_status == BQ_STDBY)
+	{
+		bq_status = BQ_RDY;
+	}
+}
+
+void afe_init_fault_thresholds()
+{
+
+	BQ_Write_Register(FO_CTRL, FO_CTRL_SIZE, 0xC3C0); //Include UV Fault OV Fault COMM SYS CHIP GPI Faults to Fault Output
+
+	BQ_Write_Register(CELL_UV, CELL_UV_SIZE, (CELL_UV_THRESHOLD & 0x03));
+	BQ_Write_Register(CELL_OV,CELL_OV_SIZE,(CELL_OV_THRESHOLD & 0x03));
+
+}
+
+void afe_update_Checksum()
+{
+	uint32_t checksum = 0;
+	BQ_Read_Register(CSUM_RSLT, CSUM_RSLT_SIZE, &checksum);
+	BQ_Write_Register(CSUM, CSUM_SIZE, checksum);
+}
+
+void afe_config_measurement_channels()
+{
+	uint16_t cellmask = 0b1111111111;
+	uint32_t channelmask = cellmask<<16;
+	BQ_Write_Register(NCHAN, NCHAN_SIZE, N_CELLS);
+	uint32_t channels = 0b1111111111 << 16;
+	BQ_Write_Register(CHANNELS, CHANNELS_SIZE, channels);
+	BQ_Write_Register(OVERSMPL, OVERSMPL_SIZE, 0xFA); //Oversampling enabled with 4 samples as average
+
+}
+
+void afe_config_communication()
+{
+	BQ_Write_Register(COMCONFIG, COMCONFIG_SIZE, (1 << 12) | (1 << 7)); //Enables UART Transceiver Diables Differential UART
+}
+
+void afe_config_gpios()
+{
+	BQ_Write_Register(GPIO_DIR, GPIO_DIR_SIZE, 0x01);
+}
+
+void afe_activate_LED()
+{
+	BQ_Write_Register(GPIO_OUT, GPIO_OUT_SIZE, 0x01);
+}
+
+void afe_config_balancing()
+{
+	BQ_Write_Register(CBCONFIG, CBCONFIG_SIZE, 0x10);
+}
+
+void afe_balance_channels(uint16_t channelstobalance)
+{
+	BQ_Write_Register(CBENBL, CBENBL_SIZE, channelstobalance);
+}
+
+