Hi. I am using STM32F407VGT6 this one and RadioLink SE100 GPS. I am trying to get $GNGGA data via USART and displaying it in putty terminal. I am able to get and print data. After 3-4 minutes gps sensor led is blinking but no data is printed on terminal.
Here is my code:
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2021 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "string.h"
#include "stdlib.h"
#include "stdio.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
uint8_t flag = 0;
// this interrupts changes flag to 1 as soon as the uint8_t buff[300] is full
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) {
flag = 1;
}
// function to calculate checksum of the NMEA sentence
// -4, but not -3 because the NMEA sentences are delimited with \r\n, and there also is the invisible \r in the end
int nmea0183_checksum(char *msg) {
int checksum = 0;
int j = 0;
// the first $ sign and the last two bytes of original CRC + the * sign
for (j = 1; j < strlen(msg) - 4; j++) {
checksum = checksum ^ (unsigned) msg[j];
}
return checksum;
}
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
UART_HandleTypeDef huart1;
UART_HandleTypeDef huart2;
DMA_HandleTypeDef hdma_usart1_rx;
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_USART1_UART_Init(void);
static void MX_USART2_UART_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* 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();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_USART1_UART_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
uint8_t buff[255];
char buffStr[255];
char nmeaSnt[80];
char *rawSum;
char smNmbr[3];
char *latRaw;
char latDg[2];
char latMS[7];
char *hemNS;
char *lonRaw;
char lonDg[3];
char lonMS[7];
char *hemEW;
char *utcRaw;
char strUTC[8];
char hH[2];
char mM[2];
char sS[2];
uint8_t cnt = 0;
HAL_UART_Receive_DMA(&huart1, buff, 255);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
if (flag == 1) {
memset(buffStr, 0, 255);
sprintf(buffStr, "%s", buff);
//HAL_UART_Transmit(&huart2, buff, 255,70);
char *token, *string;
string = strdup(buffStr);
while ((token = strsep(&string, "\n")) != NULL) {
memset(nmeaSnt, 0, 80);
sprintf(nmeaSnt, "%s", token);
if ((strstr(nmeaSnt, "$GNGGA") != 0) && strlen(nmeaSnt) > 73 && strstr(nmeaSnt, "*") != 0) {
rawSum = strstr(nmeaSnt, "*");
memcpy(smNmbr, &rawSum[1], 2);
smNmbr[2] = '\0';
uint8_t intSum = nmea0183_checksum(nmeaSnt);
char hex[2];
sprintf(hex, "%X", intSum);
if (strstr(smNmbr, hex) != NULL) {
//if we want display good $GNGLL NMEA sentences
HAL_UART_Transmit(&huart2, nmeaSnt, 74, 90);
HAL_UART_Transmit(&huart2, (uint8_t*) "\n", 1, 200);
cnt = 0;
// splitting the good NMEA sentence into the tokens by the comma delimiter
for (char *pV = strtok(nmeaSnt, ","); pV != NULL; pV = strtok(NULL, ",")) {
switch (cnt) {
case 1:
latRaw = strdup(pV);
break;
case 2:
hemNS = strdup(pV);
break;
case 3:
lonRaw = strdup(pV);
break;
case 4:
hemEW = strdup(pV);
break;
case 5:
utcRaw = strdup(pV);
break;
}
cnt++;
}
memcpy(latDg, &latRaw[0], 2);
latDg[2] = '\0';
memcpy(latMS, &latRaw[2], 7);
latMS[7] = '\0';
memcpy(lonDg, &lonRaw[0], 3);
lonDg[3] = '\0';
memcpy(lonMS, &lonRaw[3], 7);
lonMS[7] = '\0';
char strLonMS[7];
sprintf(strLonMS, "%s", lonMS);
memcpy(hH, &utcRaw[0], 2);
hH[2] = '\0';
memcpy(mM, &utcRaw[2], 2);
mM[2] = '\0';
memcpy(sS, &utcRaw[4], 2);
sS[2] = '\0';
strcpy(strUTC, hH);
strcat(strUTC, ":");
strcat(strUTC, mM);
strcat(strUTC, ":");
strcat(strUTC, sS);
strUTC[8] = '\0';
/*
HAL_UART_Transmit(&huart2, (uint8_t*) hemNS, 1, 200);
HAL_UART_Transmit(&huart2, (uint8_t*) " ", 1, 200);
HAL_UART_Transmit(&huart2, (uint8_t*) latDg, 2, 200);
HAL_UART_Transmit(&huart2, (uint8_t*) "\241", 1, 200);
HAL_UART_Transmit(&huart2, (uint8_t*) latMS, 7, 200);
HAL_UART_Transmit(&huart2, (uint8_t*) "\', ", 3, 200);
HAL_UART_Transmit(&huart2, (uint8_t*) hemEW, 1, 200);
HAL_UART_Transmit(&huart2, (uint8_t*) " ", 1, 200);
HAL_UART_Transmit(&huart2, (uint8_t*) lonDg, 3, 200);
HAL_UART_Transmit(&huart2, (uint8_t*) "\241", 1, 200);
HAL_UART_Transmit(&huart2, (uint8_t*) strLonMS, strlen(strLonMS), 200);
HAL_UART_Transmit(&huart2, (uint8_t*) "\', UTC: ", 8, 200);
HAL_UART_Transmit(&huart2, (uint8_t*) strUTC, 8, 200);
HAL_UART_Transmit(&huart2, (uint8_t*) "\n", 1, 200);
*/
}
}
}
flag = 0;
}
HAL_Delay(300);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/** 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_NONE;
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_HSI;
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_0) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief USART1 Initialization Function
* [USER=120004]@Param[/USER] 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 = 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();
}
/* USER CODE BEGIN USART1_Init 2 */
/* USER CODE END USART1_Init 2 */
}
/**
* @brief USART2 Initialization Function
* [USER=120004]@Param[/USER] 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;
if (HAL_UART_Init(&huart2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART2_Init 2 */
/* USER CODE END USART2_Init 2 */
}
/**
* Enable DMA controller clock
*/
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA2_CLK_ENABLE();
/* DMA interrupt init */
/* DMA2_Stream2_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA2_Stream2_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA2_Stream2_IRQn);
}
/**
* @brief GPIO Initialization Function
* [USER=120004]@Param[/USER] None
* @retval None
*/
static void MX_GPIO_Init(void)
{
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOA_CLK_ENABLE();
}
/* 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.
* [USER=120004]@Param[/USER] file: pointer to the source file name
* [USER=120004]@Param[/USER] 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 */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
