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To review first, before the two development under Linux stm32 (a) | using GCC – arm – none – eabi tool chain compilation and development under Linux stm32 (2) | use openocd downloading and debugging, We showed you how to create an empty bare metal project (just startup files and main files), compile the project to generate elf files, convert them to bin or HEX format, download them using OpenOCd, and finally write a prototype Makefile. And successfully lit up an LED~ but this LED we are through the pointer direct operation register address to complete, next, we on this basis, the introduction of STM32 header file, which contains the macro definition of the register, that is, the use of registers for development ~

1. Create a register project

Start with the bare metal project created in the previous section00-template-regMake a copy and rename it01-led-reg:

Leave it emptystm32f10x.hThe file is deleted, copied from the firmware library, and then used in the header filecore_cm3.handsystem_stm32f10x.hSome of the definitions in “, contain these two header files, so copy these two files as well:

Next, write the main.c file:

#include "stm32f10x.h"

int main(a)
{
	/* Start GPIOB clock */
	//*(unsigned int*)(0x40021000+0x18) |= 1<<3;
	RCC->APB2ENR |= 1<<3;
	
	/* Configure PB0 as push-pull output */
	//*(unsigned int*)(0x40010c00+0x00) |= 1<<(4*0);
	GPIOB->CRL |= 1< < (4*0);
	
	/* PB0 output low level, light green LED */
	//*(unsigned int*)(0x40010c00+0x0c) &= ~(1<<0);
	GPIOB->ODR &= ~(1<<0);
	
	while(1);
}
void SystemInit(void)
{}Copy the code

At this point, the register project is created, then start compiling ~

2. Compile & download register projects