STM32L476xx Peripheral Library

Overview

A lightweight bare-metal peripheral drivers library for STM32L476xx built with the usage of CMSIS, to avoid HAL's bloat.

Simple Examples

GPIO Blink

GPIO_Enable_Output(GPIOA,5,GPIO_OTYPE_PUSH_PULL,GPIO_PULL_UP,GPIO_SPEED_LOW);

while(1) {
	GPIO_Toggle_Pin(GPIOA, 5);
	delay_ms(1000);
}

Full example: examples/gpio_blink/

USART DMA

uint8_t rx_buffer[64];
usart_handle_t husart2;

USART_Handle_Init(&husart2, USART2, USART_MODE_DMA, rx_buffer, sizeof(rx_buf));

uint8_t msg[] = "USART2\r\n";
USART_Transmit_DMA(&husart2, msg, sizeof(msg));

uint8_t data[8];
uint32_t received = USART_Read_DMA(&husart2, data, sizeof(data));

Full example: examples/usart_send/

SPI loopback

uint8_t usart_rx_buffer[256];
usart_handle_t usart2;

uint8_t tx[] = "ABCD\r\n";
uint8_t rx[6] = {0};
spi_handle_t spi1;
spi_config_t cfg = {
	.instance = SPI1,
	.baud = SPI_BAUD_DIV_2,
	.clock_mode = SPI_CLOCK_MODE_0,
	.mode = SPI_MODE_POLLING,
	.data_size = SPI_DATASIZE_8BIT,
};

SPI_Init(&spi1, &cfg);		
USART_Handle_Init(&usart2, USART2, USART_MODE_POLLING, usart_rx_buffer , 256);

SPI_TransmitReceive8(&spi1,tx, rx, 6,100);
USART_Transmit(&usart2, rx, 6, 100);

Full example: examples/spi_test/

Features

Peripheral	Notes
GPIO	input, output, af
USART	polling, interrupt, DMA
SPI	polling
SysTick	1ms tick, delay support
System Init	Clock config, startup code

Requirements

• arm-none-eabi-gcc
• arm-none-eabi-objcopy
• make
• openocd

Targets

Command	Description
make	Build gpio_blink
make example_name	Build example_name
make flash	Flash gpio_blink.elf with OpenOCD
make flash-example_name	Flash example_name with OpenOCD
make clean	Clean the build files

License

This project is licensed under the MIT License.