- Author: Nima Askari
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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.
#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 */
}