README.md

NMEA library for STM32 LL

• Author: Nima Askari
• WebSite: https://www.github.com/NimaLTD
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• http://github.com/nimaltd/NMEA.

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• Enable USART (LL Library) and RX interrupt.
• Set baudrate, stop bits and parity.
• create a structure of nmea_t.
• Add nmea_callback() in usart interrupt.
• Configure nmea_config.h.
• Call nmea_init().
• Call nmea_loop() in infinit loop.
• If using FREERTOS, please create a task for nmea with at least 256 word heap size.

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RTOS example:

#include "nmea.h"
nmea_t gps;

int main()
{
  ...  
}

void task_nmea(void const * argument)
{
  nmea_init(&gps, USART1, 1024);
  while (1)
  {
    nmea_loop(&gps);
    osDelay(1);
  }
}

void task_other(void const * argument)
{
  uint8_t time_h; 
  for(;;)
  {
    if (nmea_available(&gps))
    {
      nmea_gnss_time_h(&gps, &time_h);
      nmea_available_reset(&gps);
    }
    osDelay(1);
  }
}

in interrupt file

#include "nmea.h"
extern nmea_t gps;

void USART1_IRQHandler(void)
{
  /* USER CODE BEGIN USART1_IRQn 0 */
	nmea_callback(&gps);
  /* USER CODE END USART1_IRQn 0 */
  /* USER CODE BEGIN USART1_IRQn 1 */

  /* USER CODE END USART1_IRQn 1 */
}