README.md

STM32 GNSS

STM32 library with DMA support for u-blox devices supporting Global Navigation Satellite Systems and UBX standard

Example:

 /* USER CODE BEGIN 2 */
	GNSS_Init(&GNSS_Handle, &huart1);
	HAL_Delay(1000);
	GNSS_LoadConfig(&GNSS_Handle);
	uint32_t Timer = HAL_GetTick();
 /* USER CODE END 2 */
 /* Infinite loop */
 /* USER CODE BEGIN WHILE */
	while (1) {

		if ((HAL_GetTick() - Timer) > 1000) {
			GNSS_GetUniqID(&GNSS_Handle);
			GNSS_ParseBuffer(&GNSS_Handle);
			HAL_Delay(250);
			GNSS_GetPVTData(&GNSS_Handle);
			GNSS_ParseBuffer(&GNSS_Handle);
           HAL_Delay(250);
           GNSS_SetMode(&GNSS_Handle,Automotiv);
           HAL_Delay(250);
			printf("Day: %d-%d-%d \r\n", GNSS_Handle.day, GNSS_Handle.month,GNSS_Handle.year);
			printf("Time: %d:%d:%d \r\n", GNSS_Handle.hour, GNSS_Handle.min,GNSS_Handle.sec);
			printf("Status of fix: %d \r\n", GNSS_Handle.fixType);
			printf("Latitude: %f \r\n", GNSS_Handle.fLat);
			printf("Longitude: %f \r\n",(float) GNSS_Handle.lon / 10000000.0);
			printf("Height above ellipsoid: %d \r\n", GNSS_Handle.height);
			printf("Height above mean sea level: %d \r\n", GNSS_Handle.hMSL);
			printf("Ground Speed (2-D): %d \r\n", GNSS_Handle.gSpeed);
			printf("Unique ID: %04X %04X %04X %04X %04X \n\r",
					GNSS_Handle.uniqueID[0], GNSS_Handle.uniqueID[1],
					GNSS_Handle.uniqueID[2], GNSS_Handle.uniqueID[3],
					GNSS_Handle.uniqueID[4], GNSS_Handle.uniqueID[5]);
			Timer = HAL_GetTick();
		}
		/* USER CODE END WHILE */
		/* USER CODE BEGIN 3 */
	}
 /* USER CODE END 3 */

Successfully tested on:

• MAX-M8Q
• NEO-M8
• NEO-M9N

NVIC configuration:

Interrupt Table	Enable	Preenmption Priority	SubPriority
USART1 global interrupt / USART1 wake-up interrupt through EXTI line 25	true	0	0
USART2 global interrupt / USART2 wake-up interrupt through EXTI line 26	true	0	0

DMA configuration:

DMA request	Stream	Direction	Priority
USART1_RX	DMA1_Channel3	Peripheral To Memory	Low
USART1_TX	DMA1_Channel4	Memory To Peripheral	Low

IPs and Middleware Configuration:

Type	Mode	Baud Rate	Word Length	Parity	Stop Bits	Data Direction
USART1	Asynchronous	9600	8 Bits (including Parity)	None	1	Receive and Transmit

UBX configuration:

//Setting input and output only for UBX standard
static uint8_t configUBX[]={0xB5,0x62,0x06,0x00,0x14,0x00,0x01,0x00,0x00,0x00,0xD0,0x08,0x00,0x00,0x80,0x25,0x00,0x00,0x01,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x9A,0x79};

//Changing the NMEA version to 4.10
static uint8_t setNMEA410[]={0xB5,0x62,0x06,0x17,0x14,0x00,0x00,0x41,0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x75,0x57};

//Activation of navigation system: Galileo, Glonass, GPS, SBAS, IMES
static uint8_t setGNSS[]={0xB5,0x62,0x06,0x3E,0x24,0x00,0x00,0x00,0x20,0x04,0x00,0x08,0x10,0x00,0x01,0x00,0x01,0x01,0x01,0x01,0x03,0x00,0x01,0x00,0x01,0x01,0x02,0x04,0x08,0x00,0x01,0x00,0x01,0x01,0x06,0x08,0x0E,0x00,0x01,0x00,0x01,0x01,0xDF,0xFB};

Pins configuration:

PERIPHERALS	MODES	FUNCTIONS	PINS
USART1	Asynchronous	USART2_RX	PB10
USART1	Asynchronous	USART2_TX	PB6
SYS	Trace Asynchronous Sw	SYS_JTMS-SWDIO	PA13
SYS	Trace Asynchronous Sw	SYS_JTCK-SWCLK	PA14
SYS	Trace Asynchronous Sw	SYS_JTDO-SWO	PB3
SYS	SysTick	SYS_VS_Systick	VP_SYS_VS_Systick
USART2	Asynchronous	USART2_RX	PA3
USART2	Asynchronous	USART2_TX	PA2

For using printf with float should be add flag -u _printf_float in C linker

More information can be found in u-blox M8 Receiver description