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Get BQ communication to work

This commit is contained in:
jazzpi 2022-06-12 00:00:42 +02:00
parent 033e3c3dde
commit 69645deb32
2 changed files with 16 additions and 3 deletions
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12
Core/Src/BQ_Communication.c
View File

@ -149,6 +149,7 @@ uint8_t BQ_Read_Register(uint8_t registeraddress, uint8_t registersize,
message[0] = FRM_WRT_R; message[0] = FRM_WRT_R;
message[1] = 0; message[1] = 0;
message[2] = registeraddress; message[2] = registeraddress;
// See BQ datasheet 7.5.3.1.2
message[3] = registersize - 1; message[3] = registersize - 1;
Calculate_CRC(message, 6); Calculate_CRC(message, 6);
@ -162,14 +163,21 @@ uint8_t BQ_Read_Register(uint8_t registeraddress, uint8_t registersize,
if (crccheck == 0) { if (crccheck == 0) {
return 0; return 0;
} }
// See Response Frame Init in BQ datasheet 7.5.1.1
uint8_t response_size = (recv_message[0] & 0x7F) + 1;
if (response_size != registersize) {
return 0;
}
data[0] = 0; data[0] = 0;
if (registersize > 4) if (registersize > 4)
registersize = 4; registersize = 4;
// Data is returned big-endian as per 7.5.3.1.2.1
for (int n = 0; n < registersize; n++) { for (int n = 0; n < registersize; n++) {
data[0] |= recv_message[1 + n] >> (8 * n); int shift_amount = 8 * (registersize - n - 1);
data[0] |= recv_message[1 + n] << shift_amount;
} }
return 1; return 1;
@ -195,7 +203,7 @@ uint32_t BQ_ReadMeasurements(uint8_t* buffer, uint8_t bufferlength) {
uint8_t recv_buf[recv_len]; uint8_t recv_buf[recv_len];
uint8_t uartstat = BQ_UART_Receive(recv_buf, recv_len); uint8_t uartstat = BQ_UART_Receive(recv_buf, recv_len);
if (Check_CRC(recv_buf, recv_len) == 0) { if (uartstat != HAL_OK || Check_CRC(recv_buf, recv_len) == 0) {
return 0; return 0;
} }

7
Core/Src/main.c
View File

@ -21,7 +21,9 @@
/* Private includes ----------------------------------------------------------*/ /* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */ /* USER CODE BEGIN Includes */
#include "BQ_Abstraction_Layer.h"
#include "stm32f4xx_hal.h"
/* USER CODE END Includes */ /* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/ /* Private typedef -----------------------------------------------------------*/
@ -108,7 +110,9 @@ int main(void) {
MX_USART3_UART_Init(); MX_USART3_UART_Init();
MX_USART6_UART_Init(); MX_USART6_UART_Init();
/* USER CODE BEGIN 2 */ /* USER CODE BEGIN 2 */
HAL_GPIO_WritePin(DCDC_CTRL_GPIO_Port, DCDC_CTRL_Pin, GPIO_PIN_SET);
HAL_Delay(100);
afe_init(&huart2);
/* USER CODE END 2 */ /* USER CODE END 2 */
/* Infinite loop */ /* Infinite loop */
@ -117,6 +121,7 @@ int main(void) {
/* USER CODE END WHILE */ /* USER CODE END WHILE */
/* USER CODE BEGIN 3 */ /* USER CODE BEGIN 3 */
afe_measure();
} }
/* USER CODE END 3 */ /* USER CODE END 3 */
} }