STM32F4_SDR_GPS

Software GPS receiver for STM32F4
See article (in Russian): https://habr.com/ru/articles/789382/
You can find same project for ESP32 here: https://github.com/iliasam/ESP32_SDR_GPS

This is a demo project of STM32-based SDR GPS receiver.
No additional factory/commercial "black box" GPS receiver is needed here - just connect MAX2769 to the STM32 MCU.
All "raw" GPS signal processing is done at the STM32.
Results of the GPS receiving are send to the UART:

That how receiver is looking:

Video about this project:
https://youtu.be/1hBnaDsQgMc

Configured for STM32F4-DISCOVERY dev. board.
-Os optimization is used here

User set PRN codes of 4 satellites in code - before compiling FW.
User can enter Doppler frequency offset to make acquisition much faster.

RF frontend pinout (See config.h):
#define SPI_CLK_PIN GPIO_Pin_13 //MAX2769 - CLKOUT
#define SPI_MOSI_PIN GPIO_Pin_15 //MAX2769 - I1
Both - GPIOB

Part of the code is taken from these projects:
https://github.com/tomojitakasu/RTKLIB
https://github.com/taroz/GNSS-SDRLIB