目录
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);#endifspi.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0if(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;}
}实验效果
