I have to interface the nucleo-u083rc with ads1293 to get ecg data. I have provided the code from stm32cubeide and also the ioc picture. I have connected the D4 pin(MCU) as DRDYB pin and SPI1 and I use channel 1 from the sensor. Please help me with the code to get things right.
STM32 Cubeide:
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include<string.h>
#include<stdio.h>
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
// ADS1293 Register Addresses
#define REG_CH_CNFG 0x2F
#define REG_DRDYB_SRC 0x27
#define REG_MASK_DRDYB 0x20
#define REG_DATA_LOOP 0x50
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
uint32_t data;
int32_t ecg;
int32_t ecgData;
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
SPI_HandleTypeDef hspi1;
UART_HandleTypeDef huart2;
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_SPI1_Init(void);
static void MX_USART2_UART_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
void ADS1293_WriteReg(uint8_t address, uint8_t data) {
uint8_t dataToSend[1];
uint8_t addrToSend[1];
dataToSend[0]=(address & 0x7F);
addrToSend[0]=data;
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, RESET);
HAL_SPI_Transmit(&hspi1, dataToSend, 1, HAL_MAX_DELAY);
HAL_SPI_Transmit(&hspi1, addrToSend, 1, HAL_MAX_DELAY);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, SET);
}
uint8_t ads1293readdata(uint8_t rdAddress)
{
uint8_t rdData;
uint8_t dataToSend[1];
uint8_t zero[1]={0};
dataToSend[0]= (rdAddress | 0x80);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, RESET);
HAL_SPI_Transmit(&hspi1, dataToSend, 1, HAL_MAX_DELAY);
rdData=HAL_SPI_Transmit(&hspi1, zero, 1, HAL_MAX_DELAY);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, SET);
return rdData;
}
uint32_t getECGdata(uint8_t channel){
uint8_t rawData[3];
if(channel < 1 || channel > 3){
return -1; //return error, -1
}else {
channel -= 1;
}
rawData[0] = ads1293readdata(0x37 + (channel * 3));
rawData[1] = ads1293readdata(0x38 + (channel * 3));
rawData[2] = ads1293readdata(0x39 + (channel * 3));
uint32_t tempData = (uint32_t)rawData[0] << 16;
tempData = (uint32_t)rawData[1]<< 8;
tempData |= rawData[2];
tempData = tempData << 8;
ecgData = (int32_t) (tempData);
return ecgData ;
}
void ADS1293_Init() {
// Write initial configuration
ADS1293_WriteReg(0x01, 0x11); // Set input multiplexer
HAL_Delay(1);
ADS1293_WriteReg(0x02, 0x19); // Set input multiplexer for channel 2
HAL_Delay(1);
ADS1293_WriteReg(0x0A, 0x07); // Enable CMDET for IN1, IN2, IN3
HAL_Delay(1);
ADS1293_WriteReg(0x0C, 0x04); // Connect RLD amplifier to IN4
HAL_Delay(1);
ADS1293_WriteReg(0x12, 0x04); // Use external crystal
HAL_Delay(1);
ADS1293_WriteReg(0x14, 0x24); // Shut down unused channel 3 path
HAL_Delay(1);
ADS1293_WriteReg(0x21, 0x02); // Set R2 decimation rate to 5
HAL_Delay(1);
ADS1293_WriteReg(0x22, 0x02); // Set R3 decimation rate to 6 for channel 1
HAL_Delay(1);
ADS1293_WriteReg(0x23, 0x02); // Set R3 decimation rate to 6 for channel 2
HAL_Delay(1);
ADS1293_WriteReg(0x27, 0x08); // Set DRDYB source to channel 1 ECG
HAL_Delay(1);
ADS1293_WriteReg(0x2F, 0x30); // Enable ECG mode for loop read-back
HAL_Delay(1);
ADS1293_WriteReg(0x00, 0x01); // Start data conversion
HAL_Delay(1);
}
/* USER CODE END 0 */
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_SPI1_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
ADS1293_Init();
HAL_Delay(10);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_5) == GPIO_PIN_RESET)
{
ecg = getECGdata(1);
char uart_buffer[12];
//sprintf(uart_buffer, "%08lX\r\n", ecg); // Convert data to hexadecimal string
sprintf(uart_buffer, "%ld\r\n", ecg);
HAL_UART_Transmit(&huart2, (uint8_t*)uart_buffer, strlen(uart_buffer), HAL_MAX_DELAY);
HAL_Delay(1000);
}
}
/* USER CODE END 3 */
}
ioc image:
