GPIO模拟spi时序点亮数码管

spi.h

spi.c

main.c

实验效果

spi.h

#ifndef __SPI_H__
#define __SPI_H__

#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"


//spi初始化
void spi_init();
//spi写入数据
void spi_write(unsigned char data);

#endif

spi.c

#include "spi.h"

extern void delay_us(void);

//spi初始化
void spi_init(){
    //使能GPIOE时钟
    RCC->MP_AHB4ENSETR |= (0x1<<4);

    //PE11配置为输出、推挽输出、无上拉下拉、高速输出
    GPIOE->MODER &= (~(0x3<<22));
    GPIOE->MODER |= (0x01<<22);

    GPIOE->OTYPER &= (~(0x1<<11));

    GPIOE->PUPDR &= (~(0x3<<22));

    GPIOE->OSPEEDR &= (~(0x3<<22));
    //PE12配置为输出、推挽输出、无上拉下拉、高速输出
    GPIOE->MODER &= (~(0x3<<24));
    GPIOE->MODER |= (0x01<<24);

    GPIOE->OTYPER &= (~(0x1<<12));

    GPIOE->PUPDR &= (~(0x3<<24));

    GPIOE->OSPEEDR &= (~(0x3<<24));
    //PE14配置为输出、推挽输出、无上拉下拉、高速输出
    GPIOE->MODER &= (~(0x3<<28));
    GPIOE->MODER |= (0x01<<28);

    GPIOE->OTYPER &= (~(0x1<<14));

    GPIOE->PUPDR &= (~(0x3<<28));

    GPIOE->OSPEEDR &= (~(0x3<<28));
    //PE13配置为输入
    GPIOE->MODER &= (~(0x3<<26));
    
    //sck、rck为低电平
    GPIOE->ODR &= (~(0x1<<12));
    GPIOE->ODR &= (~(0x1<<11));
}

//spi写入数据
void spi_write(unsigned char data){
    for (int i = 0; i < 8; i++)
    {
        //判断发送数据是1或0
        if(data & 0x01){
            GPIOE->ODR |= (0x1<<14);
        }
        else{
            GPIOE->ODR &= (~(0x1<<14));
        }
        //data右移1位
        data>>=1;
        //sck产生一个上升沿
        GPIOE->ODR &= (~(0x1<<12));
        delay_us();
        GPIOE->ODR |= (0x1<<12);
        delay_us();
    }
}

main.c

#include "gpio.h"
#include "led.h"
#include "uart4.h"
#include "keyip.h"
#include "iic.h"
#include "si7006.h"
#include "ap3216c.h"
#include "spi.h"

/*
0:0xFC
1:0x60
2:0xDA
3:0xF2
4:0x66
5:0xB6
6:0xBE
7:0xE0
8:0xFE
9:0xF6
*/

extern void printf(const char *fmt, ...);

int main()
{

	unsigned char led[10] = {0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0, 0xFE, 0xF6};
	spi_init();
	while (1)
	{
		int i,j,k;
		for (i = 6; i >= 0; i--)
		{
			for (j = 9; j >= 0; j--)
			{
				for (k = 0; k < 20; k++)
				{
					spi_write(0x80);
					spi_write(led[i]);
					// 数据刷新到锁存寄存器
					GPIOE->ODR &= (~(0x1 << 11));
					delay_us();
					GPIOE->ODR |= (0x1 << 11);
					delay_us();
					spi_write(0x40);
					spi_write(led[j]);
					// 数据刷新到锁存寄存器
					GPIOE->ODR &= (~(0x1 << 11));
					delay_us();
					GPIOE->ODR |= (0x1 << 11);
					delay_us();
				}
			}
		}
		return 0;
	}
}