Hi,
I am using STM32MP1F157-DK2 focusing on the ARM Cortex M4 chip and I am facing some issues while wanting to read ADC values from my sensors. I am relatively new to this and any advise or help would be greatly appreciated. I flashed the starter package into the STM32 discovery board initially based on documentation here. The following is the code performed on Arduino that I wanted to perform on the STM32 discovery board.
void setup() {
// initialize the serial communication:
Serial.begin(9600);
pinMode(10, INPUT); // Setup for leads off detection LO +
pinMode(11, INPUT); // Setup for leads off detection LO -
}
void loop() {
if((digitalRead(10) == 1)||(digitalRead(11) == 1)){
Serial.println('!');
}
else{
// send the value of analog input 0:
Serial.println(analogRead(A0));
}
//Wait for a bit to keep serial data from saturating
delay(1);
}
Based on the schematic of the STM32MP157F-DK2, I found out that the STLINK RX and TX is connected to PA2 and PA3 on the ST-Link MCU and it is connected to UART4 RX and TX. Based on the datasheet, I found out that the port PA2 has alternate function of USART2_TX and hence I configure the pins as shown below, assuming my ADC values can be displayed through the serial monitor when code is run. I have configure the baud rate as 115200.
Next, I am connecting my sensor onto the STM32 discovery board on the Arduino connector pins at the bottom of the board.
Based on the datasheet attached as image above, I connected LO + to PE11 on the STM and configure it as GPIO INPUT while connecting LO- to PE14 and configure it as GPIO INPUT as well. Next I connected AN0 to PF14 and configuring it as shown below. However, based on the datasheet, I should configure it as ADC1_IN0 but it is not shown in the pinout view so I configure it as ADC2INP6 single-ended.
I also want the ADC the store into DMA so this is how I configure my DMA2.
Finally, I have written a simple script for the STM as shown below:
int main(void)
{
/* USER CODE BEGIN 1 */
uint16_t buf[1024]; //array to store dma levels
float buf_Value[1024]; //array to store voltage value
char arr[100]; //array for dma sprintf
/* 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 */
if(IS_ENGINEERING_BOOT_MODE())
{
/* Configure the system clock */
SystemClock_Config();
}
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_USART2_UART_Init();
MX_ADC2_Init();
MX_UART4_Init();
/* USER CODE BEGIN 2 */
/////////////////////////////////store in adc in dma////////////////////////////////
HAL_ADC_Start_DMA(&hadc2, (uint32_t *)buf, 1024);
HAL_Delay(50);
////////////////////////////////////////////////////////////////////////////////////
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/////////////////////////////////read adc voltage////////////////////////////////
for (int i = 0; i<1024; i++) {
buf_Value[i] = (float)(buf[i])*3.3/4096;
/////////////////////////////////print adc voltage////////////////////////////////
int lo_plus = HAL_GPIO_ReadPin(GPIOE, GPIO_PIN_11);
int lo_min = HAL_GPIO_ReadPin(GPIOE, GPIO_PIN_14);
char *tmpSign = (buf_Value[i] < 0) ? "-" : "";
float tmpVal = (buf_Value[i] < 0) ? -buf_Value[i] : buf_Value[i];
int tmpInt1 = tmpVal; // Get the integer (678).
float tmpFrac = tmpVal - tmpInt1; // Get fraction (0.0123).
int tmpInt2 = trunc(tmpFrac * 10000); // Turn into integer (123).
if ((lo_plus == 1) || (lo_min ==1 )) {
sprintf(arr, "!\n");
}
else {
// Print as parts, note that you need 0-padding for fractional bit.
sprintf (arr, "adc_read = %s%d.%04d\r\n", tmpSign, tmpInt1, tmpInt2);
}
// sprintf(arr, "%g\r\n", buf_Value[i]);
HAL_UART_Transmit(&huart2, (uint8_t*)arr, strlen(arr), HAL_MAX_DELAY);
HAL_Delay(1);
}
//////////////////////////////////////////////////////////////////////////////////////
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
When running the code in CM4, it does not display the ADC values that I want but only load into the terminal of the Yocto OS.
What can I do to display my ADC values onto my serial monitor via ST Link and is my configuration for the Arduino connectors correct?
Thanks in advance.
1 ACCEPTED SOLUTION
Accepted Solutions
