Solved
ultrasonic A02YYUW not working in STM32L443VCT6
Hi,
I try to comuunicate between STM32L443VCT6 and ultrasonic A02YYUW (By UART1)
Just to make sure that the ultrasonic is working ok, i tested it by UART1 with model: stm32 neucler f441 and everthing works ok.
This is the code for the STM32L443VCT6:
#include "main.h"
#include "string.h"
#include "stdio.h"
#include "stdlib.h"
#include <stdbool.h>
UART_HandleTypeDef huart1;
uint8_t data[4] = {0}; // Buffer to hold the 4 bytes from the sensor
float distance = 0.0;
void SystemClock_Config(void);
void MX_GPIO_Init(void);
void MX_USART2_UART_Init(void);
int main(void) {
HAL_Init();
SystemClock_Config(); // Use internal oscillator (MSI)
MX_GPIO_Init();
USART1_UART_Init();
/* Infinite loop */
while (1) {
/* Wait for the start corrector (0xFF) */
do {
HAL_UART_Receive(&huart1, &data[0], 1, HAL_MAX_DELAY);
} while (data[0] != 0xFF);
/* Clear the data array before receiving new data */
//clearDataArray();
/* Start receiving 3 more bytes of data */
for (int i = 1; i < 4; i++) {
HAL_UART_Receive(&huart1, &data[i], 1, HAL_MAX_DELAY); // Blocking receive
}
/* Process the sensor data */
processSensorData();
HAL_Delay(100); // Delay for sensor refresh (similar to Arduino delay)
}
/* Infinite loop */
while (1) {
// Keep running if needed, or you can add additional functionality
}
}
void processSensorData(void) {
/* Validate the checksum */
int sum = (data[0] + data[1] + data[2]) & 0x00FF;
// if (sum == data[3]) {
/* Calculate the distance */
distance = (data[1] << + data[2]; // Combine the two bytes into a 16-bit value
distance = distance / 10.0; // Convert distance to cm
/* Blink the LED to indicate valid data */
if(distance<10){
HAL_Delay(500);
}
// } else {
// Handle checksum error (optional)
//}
}
/* GPIO Initialization Function */
void MX_GPIO_Init(void) {
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* Enable GPIO clock for PA9 and PA10 (USART1 TX/RX pins) */
__HAL_RCC_GPIOA_CLK_ENABLE();
/* Configure PA9 (USART1 TX) */
GPIO_InitStruct.Pin = GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; // Alternate function push-pull
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF7_USART1; // AF7 for USART1
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* Configure PA10 (USART1 RX) */
GPIO_InitStruct.Pin = GPIO_PIN_10;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; // Alternate function push-pull
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF7_USART1; // AF7 for USART1
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
void USART1_UART_Init(void) {
/* Enable USART1 clock */
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOE_CLK_ENABLE(); // Enable clock for Port E
__HAL_RCC_GPIOD_CLK_ENABLE();
__HAL_RCC_USART1_CLK_ENABLE();
/* Initialize USART1 */
huart1.Instance = USART1;
huart1.Init.BaudRate = 9600;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart1) != HAL_OK) {
Error_Handler(); // Handle initialization error
}
}
/* System Clock Configuration */
void SystemClock_Config(void) {
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
// Configure the main internal regulator output voltage
if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK) {
Error_Handler();
}
// Initializes the RCC Oscillators according to the specified parameters
// Here we use the internal Multi-Speed Internal (MSI) oscillator
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6; // MSI range 6 corresponds to 4 MHz
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
RCC_OscInitStruct.PLL.PLLM = 1;
RCC_OscInitStruct.PLL.PLLN = 40;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
Error_Handler();
}
// Initializes the CPU, AHB, and APB buses clocks
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
| RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK) {
Error_Handler();
}
// Enable MSI Auto-calibration
HAL_RCCEx_EnableMSIPLLMode();
}
/* Error Handler */
void Error_Handler(void) {
__disable_irq();
while (1) {
// Blink the LED to indicate an error
HAL_Delay(500);
}
}