Hi,
since some days I try to get a communication between a STM32F030R8 Nucleo and an ESP8266 WIFI module working. Communication between Putty and WIFI module works already. I am stucking at receiving the answers from ESP module. I already tryed it with interrupt or DMA and now simply with polling, but I can not read the answers from the module. I looked at the communication with my logic analyzer and saw, that the module seems to receive the AT command correctly and gives a correct response. All with the baudrate of 115200 wich I set for the interface.
Here is my main.c code:
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include <ESP8266.h>
/* Private variables ---------------------------------------------------------*/
UART_HandleTypeDef huart1;
UART_HandleTypeDef huart2;
uint8_t ESP8266_rxBuffer[12] = {0};
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_USART1_UART_Init(void);
int main(void)
{
// MCU Configuration
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART2_UART_Init();
MX_USART1_UART_Init();
// Initialize ESP8266
init_ESP8266();
while (1)
{
}
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
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_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
{
Error_Handler();
}
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1;
PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK1;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief USART1 Initialization Function
* @param None
* @retval None
*/
static void MX_USART1_UART_Init(void)
{
/* USER CODE BEGIN USART1_Init 0 */
/* USER CODE END USART1_Init 0 */
/* USER CODE BEGIN USART1_Init 1 */
/* USER CODE END USART1_Init 1 */
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
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;
huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART1_Init 2 */
/* USER CODE END USART1_Init 2 */
}
/**
* @brief USART2 Initialization Function
* @param None
* @retval None
*/
static void MX_USART2_UART_Init(void)
{
/* USER CODE BEGIN USART2_Init 0 */
/* USER CODE END USART2_Init 0 */
/* USER CODE BEGIN USART2_Init 1 */
/* USER CODE END USART2_Init 1 */
huart2.Instance = USART2;
huart2.Init.BaudRate = 9600;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2.Init.OverSampling = UART_OVERSAMPLING_16;
huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART2_Init 2 */
/* USER CODE END USART2_Init 2 */
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOF_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GPIOC, ESP_Reset_Pin|ESP_PowerDown_Pin, GPIO_PIN_SET);
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GreenLED_GPIO_Port, GreenLED_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin : BlueButton_Pin */
GPIO_InitStruct.Pin = BlueButton_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(BlueButton_GPIO_Port, &GPIO_InitStruct);
/*Configure GPIO pins : ESP_Reset_Pin ESP_PowerDown_Pin */
GPIO_InitStruct.Pin = ESP_Reset_Pin|ESP_PowerDown_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
/*Configure GPIO pin : GreenLED_Pin */
GPIO_InitStruct.Pin = GreenLED_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GreenLED_GPIO_Port, &GPIO_InitStruct);
/* EXTI interrupt init*/
HAL_NVIC_SetPriority(EXTI4_15_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(EXTI4_15_IRQn);
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */And here is the init function for the ESP8266, currently reduced to only the AT command. I have set an breakpoint after the receive function to check the buffer contents:
/*
* ESP8266.c
*
* Created on: Nov 1, 2022
* Author: jensk
*/
#include "main.h"
#include "string.h"
#include <ESP8266.h>
void init_ESP8266()
{
HAL_Delay(8000);
HAL_UART_Transmit(&huart1, (uint8_t *) "AT\r\n", 4, 100);
HAL_UART_Receive(&huart1, ESP8266_rxBuffer, 10, 5000);
}UART1 is the ESP module, UART2 the PC.
i needed ESP communication also; problem was: never know, length of string sended.
so i use the callbacks, on received char INT is started and i store new char to an array.
when line end coming, i set a signal -> global var to length of string.
then analyze string in main, IF var > 0 .
not so difficult...but need bigger array, because debug messages can be long...
and dont forget to handle error on receive !
parser:
Thank you for the quick help. I've implemented the int with RxCpltCallback function again, this time with the overflow check like you did it.
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include <ESP8266.h>
/* Private variables ---------------------------------------------------------*/
UART_HandleTypeDef huart1;
UART_HandleTypeDef huart2;
uint8_t ESP8266_rxBuffer[200] = {0};
uint8_t ESP8266_rxCNT = 0;
uint8_t rxDone = 0;
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_USART1_UART_Init(void);
int main(void)
{
uint8_t outBuf[200] = {0};
uint8_t i;
// MCU Configuration
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART2_UART_Init();
MX_USART1_UART_Init();
HAL_UART_Transmit(&huart2, "\n\n\r", 3, 1000);
HAL_UART_Receive_IT(&huart1, ESP8266_rxBuffer, 1);
// Initialize ESP8266
init_ESP8266();
while (1)
{
if(rxDone) // Check if message was received completely
{
// Copy contents of receive buffer to output buffer without first char because its always the newest received
for(i = 0; i < 200; i++)
{
outBuf[i] = ESP8266_rxBuffer[i + 1];
}
HAL_UART_Transmit(&huart2, outBuf, sizeof(outBuf), 1000);
rxDone = 0;
}
}
}
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
ESP8266_rxCNT++;
if(ESP8266_rxCNT > 198) // Catch overflow
{
ESP8266_rxCNT = 1;
}
else if(ESP8266_rxBuffer[0] == 0x0D) // CR detected
{
rxDone = 1;
}
ESP8266_rxBuffer[ESP8266_rxCNT] = ESP8266_rxBuffer[0];
HAL_UART_Receive_IT(&huart1, ESP8266_rxBuffer, 1);
}Now I can see some answers of the ESP module like in console, but the answer for AT command is still random chars
Made some changes in main:
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include <ESP8266.h>
/* Private variables ---------------------------------------------------------*/
UART_HandleTypeDef huart1;
UART_HandleTypeDef huart2;
uint8_t ESP8266_rxBuffer[1] = {0};
uint8_t recBuf[200];
uint8_t ESP8266_rxCNT = 0;
uint8_t rxDone = 0;
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_USART1_UART_Init(void);
int main(void)
{
// MCU Configuration
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART2_UART_Init();
MX_USART1_UART_Init();
HAL_UART_Transmit(&huart2, "\n\n\r", 3, 1000);
HAL_UART_Receive_IT(&huart1, ESP8266_rxBuffer, 1);
// Initialize ESP8266
init_ESP8266();
while (1)
{
if(rxDone) // Check if message was received completely
{
HAL_UART_Transmit(&huart2, recBuf, sizeof(recBuf), 1000);
rxDone = 0;
}
}
}
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
ESP8266_rxCNT++;
if(ESP8266_rxCNT > 198) // Catch overflow
{
ESP8266_rxCNT = 1;
}
else if(ESP8266_rxBuffer[0] == 0x0A) // LF detected
{
rxDone = 1;
}
recBuf[ESP8266_rxCNT - 1] = ESP8266_rxBuffer[0];
HAL_UART_Receive_IT(&huart1, ESP8266_rxBuffer, 1);
}Now output looks like
well, i am tired now and cant see , what you doing wrong...
but:
- you have the "error callback" ? must be.
- INT priority...
-- need error treatment , maybe like i did : just wait for next
-- or screen connection , to get no spikes on line
