hi,
I am integrating ADS1256 ADC, which communicates on SPI with NUCLEO-H753ZI board.
Firstly, I can communicate when I am writing my code in Arduino, which is simple. It is working fine and showing me the converted output.
But for some reasons I have to use cubide and perform some work on ethernet after establishing communication on SPI. But through cubeIDE I am not able to establish cube ide. below is Clock config
But with same flow as in Arduino, I cannot stablish communication. Cannot read registers of the device, nor i can get the output
and here is my SPI initiazation.
hspi3.Instance = SPI3;
hspi3.Init.Mode = SPI_MODE_MASTER;
hspi3.Init.Direction = SPI_DIRECTION_2LINES;
hspi3.Init.DataSize = SPI_DATASIZE_8BIT;
hspi3.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi3.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi3.Init.NSS = SPI_NSS_SOFT;
hspi3.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64;
hspi3.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi3.Init.TIMode = SPI_TIMODE_DISABLE;
hspi3.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi3.Init.CRCPolynomial = 0x0;
hspi3.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
hspi3.Init.NSSPolarity = SPI_NSS_POLARITY_LOW;
hspi3.Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;
hspi3.Init.TxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
hspi3.Init.RxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
hspi3.Init.MasterSSIdleness = SPI_MASTER_SS_IDLENESS_00CYCLE;
hspi3.Init.MasterInterDataIdleness = SPI_MASTER_INTERDATA_IDLENESS_00CYCLE;
hspi3.Init.MasterReceiverAutoSusp = SPI_MASTER_RX_AUTOSUSP_DISABLE;
hspi3.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_DISABLE;
hspi3.Init.IOSwap = SPI_IO_SWAP_DISABLE;
if (HAL_SPI_Init(&hspi3) != HAL_OK)
{
Error_Handler();
}
void delay_us(uint32_t us)
{
// Reset the counter to 0
__HAL_TIM_SET_COUNTER(&htim2, 0);
// Wait until the counter reaches the desired delay
while (__HAL_TIM_GET_COUNTER(&htim2) < us);
}
uint8_t ADS1256_DRDY_Wait()
{
unsigned int DRDY_State = 1;
while(DRDY_State)
{
DRDY_State = HAL_GPIO_ReadPin(DRDY_PIN_GPIO_Port, DRDY_PIN_Pin);
}
return 0;
}
uint8_t ADS1256_Reset()
{
HAL_GPIO_WritePin(RST_PIN_GPIO_Port, RST_PIN_Pin, 0);
HAL_Delay(100);
HAL_GPIO_WritePin(RST_PIN_GPIO_Port, RST_PIN_Pin, 1);
uint8_t resetCmd = 0xfe;
HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET); // CS Low
HAL_SPI_Transmit(&hspi3, &resetCmd, 1, HAL_MAX_DELAY);
HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET); // CS High
return 0;
}
void ADS1256_SelectChannel()
{
uint8_t wregCmd[3];
wregCmd[0] = 0x50 | 0x01; // WREG command for the MUX register (0x01)
wregCmd[1] = 0x00; // Number of registers to write minus 1 (just the MUX register)
wregCmd[2] = 0x2f; // Channel configuration
ADS1256_DRDY_Wait();
HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET); // CS Low
HAL_SPI_Transmit(&hspi3, wregCmd, 2, HAL_MAX_DELAY); // Send WREG command and data
delay_us(5);
HAL_SPI_Transmit(&hspi3, &wregCmd[2], 1, HAL_MAX_DELAY);
HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET); // CS High
}
uint8_t ADS1256_ReadMuxRegister()
{
uint8_t rregCmd[2];
uint8_t regValue = 0x01;
rregCmd[0] = 0x10 | 0x01; // RREG command for the MUX register (0x01)
rregCmd[1] = 0x00; // Number of registers to read minus 1 (just the MUX register)
ADS1256_DRDY_Wait();
HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET); // CS Low
HAL_SPI_Transmit(&hspi3, rregCmd, 2, HAL_MAX_DELAY); // Send RREG command
delay_us(5);//5 microsec delay required
HAL_SPI_Receive(&hspi3, ®Value, 1, HAL_MAX_DELAY); // Receive the register value
HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET); // CS High
printf("\nRegister Value = %x", regValue);
return regValue;
}
void ADS1256_ReadData(uint32_t *adcValue)
{
uint8_t rdataCmd = 0x01; // RDATA command
uint8_t rxBuffer[3]; // Buffer for 24-bit ADC data
ADS1256_DRDY_Wait();
HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_RESET); // CS Low
HAL_SPI_Transmit(&hspi3, &rdataCmd, 1, HAL_MAX_DELAY); // Send RDATA command
delay_us(10);
HAL_SPI_Receive(&hspi3, rxBuffer, 3, HAL_MAX_DELAY); // Receive 24-bit data
HAL_GPIO_WritePin(SPI_CS_GPIO_Port, SPI_CS_Pin, GPIO_PIN_SET); // CS High
// Combine the 3 bytes into a 24-bit integer
*adcValue = ((uint32_t)rxBuffer[0] << 16) |
((uint32_t)rxBuffer[1] << 8) |
(uint32_t)rxBuffer[2];
}
double ConvertToVoltage(int32_t registerData)
{
double Voltage = 0;
double VREF = 2.5;
long minus = registerData >> 23;
if (minus == 1) //if the 24th bit (sign) is 1, the number is negative
{
registerData = registerData - 16777216; //conversion for the negative sign
//"mirroring" around zero
}
Voltage = ((2*VREF) / 8388608)*registerData; //2.5 = Vref; 8388608 = 2^{23} - 1
return (Voltage);
}
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
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();
/* Configure the peripherals common clocks */
PeriphCommonClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_SPI3_Init();
MX_TIM2_Init();
/* Initialize interrupts */
MX_NVIC_Init();
/* USER CODE BEGIN 2 */
/* USER CODE END 2 */
/* Initialize leds */
BSP_LED_Init(LED_GREEN);
BSP_LED_Init(LED_BLUE);
BSP_LED_Init(LED_RED);
/* Initialize USER push-button, will be used to trigger an interrupt each time it's pressed.*/
BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);
/* Initialize COM1 port (115200, 8 bits (7-bit data + 1 stop bit), no parity */
BspCOMInit.BaudRate = 115200;
BspCOMInit.WordLength = COM_WORDLENGTH_8B;
BspCOMInit.StopBits = COM_STOPBITS_1;
BspCOMInit.Parity = COM_PARITY_NONE;
BspCOMInit.HwFlowCtl = COM_HWCONTROL_NONE;
if (BSP_COM_Init(COM1, &BspCOMInit) != BSP_ERROR_NONE)
{
Error_Handler();
}
/* USER CODE BEGIN BSP */
/* -- Sample board code to send message over COM1 port ---- */
printf("Welcome to STM32 world !\n\r");
/* -- Sample board code to switch on leds ---- */
BSP_LED_On(LED_GREEN);
BSP_LED_On(LED_BLUE);
BSP_LED_On(LED_RED);
/* USER CODE END BSP */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
HAL_TIM_Base_Start(&htim2);
ADS1256_Reset();
ADS1256_ReadMuxRegister();
ADS1256_SelectChannel();
ADS1256_ReadMuxRegister();
uint32_t adcValue = 0;
double Voltage = 0;
while (1)
{
ADS1256_SelectChannel();
ADS1256_ReadMuxRegister();
ADS1256_ReadData(&adcValue);
printf("\nADC Value: %d", adcValue);
ConvertToVoltage(adcValue);
Voltage = ConvertToVoltage(adcValue);
printf("\nConverted Voltage: %f\n\n", Voltage);
BSP_LED_Toggle(LED_GREEN);
BSP_LED_Toggle(LED_BLUE);
BSP_LED_Toggle(LED_RED);
HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
delay_us(500000);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
But with same flow as in Arduino, I canot stablish communication. Cannot read the registers of the device, nor can I get the output. I am new, so can't guess what is going on. With SPI communication I am using "timer" which is working well and i am blinking LEDs also. Moreover, I am sending data to virtual "COM" which also works. Help is requested in this regard. i can also upload Arduinoi code as well if required.
Thanks Andrew, for the reply
>>Schematic?
Here is how I am connecting wires in both cases. I don't need to change the wiring or schematic. When uploading through arduino my adc works fine. In both cases I am using SPI3
Below is the CubeIDE pin config
What Arduino were you using?
I am using Arduino IDE 2.3.4 and CubeIDe is Version: 1.18.0 Build: 24413_20250227_1633 (UTC).
Unfortunately I haven't connected scope. I am working from home for this project and don't have scope now., but I will arranged that.
Before getting into SPI, have you got a simple blinking LED working on the Nucleo? And UART output?
Yes the LED is blinking and I can see COM port data on my laptop. Even I am blinking led in the same while loop and sending data on COM port where I am reading data from SPI. Only SPI is not working
Below is the brief on what I am doing in Arduino
#include <SPI.h>
#define DRDY_PIN PC7
#define RST_PIN PA15//PA15
#define SPI_CS PD14//PD14
SPIClass SPI_A;
double VREF = 2.5;
void setup()
{
// put your setup code here, to run once:
pinMode(PE1,OUTPUT);
Serial.begin(115200);
while(!Serial);
SPI_A = SPIClass(PB5, PB4, PB3);
Initialize_ADS1256();
}
void loop()
{
digitalWrite(PE1,HIGH);//LED
delay(250);
digitalWrite(PE1,LOW); //LED
delay(250);
ReadRegister(0x01);
WriteRegister(0x01, 0x2f);
ReadSingle();
}
void Initialize_ADS1256()
{
pinMode(SPI_CS, OUTPUT);
digitalWrite(SPI_CS, LOW);
pinMode(RST_PIN, OUTPUT);
pinMode(DRDY_PIN, INPUT);
SPI_A.begin();
digitalWrite(RST_PIN, LOW);
delay(500);
digitalWrite(RST_PIN, HIGH);
delay(500);
}
How to insert source code. By the way this link is not working
