ARM1.2作业

实现数码管不同位显示不同的数字

spi.h

#ifndef __SPI_H__
#define __SPI_H__
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"//MOSI对应的引脚输入高低电平的信号PE14
#define MOSI_OUTPUT_H()  do{GPIOE->ODR |= (0x1 << 14);}while(0)
#define MOSI_OUTPUT_L()  do{GPIOE->ODR &= (~(0x1 << 14));}while(0)//对应595芯片的锁存引脚输出高低电平   PE11
#define NSS_OUTPUT_H()   do{GPIOE->ODR |= (0x1 <<11);}while(0)
#define NSS_OUTPUT_L()   do{GPIOE->ODR &= (~(0x1 <<11));}while(0)//时钟信号对应的引脚输出高低电平  PE12
#define SCK_OUTPUT_H()  do{GPIOE->ODR |= (0x1 <<12);}while(0)
#define SCK_OUTPUT_L()  do{GPIOE->ODR &= (~(0x1 <<12));}while(0)//SPI初始化函数，推挽输出，高速，禁止上拉和下拉
void SPI_init(void);
//SPI发送数据的函数
void SPI_write(unsigned char dat);
void delay_us1(unsigned int us);
#endif

spi.c

#include "spi.h"void delay_us1(unsigned int us)
{int i,j;for(i = 0;i<us;i++)for(j = 0;j<1;j++);
}void SPI_init(void)
{RCC->MP_AHB4ENSETR |= (0x1 << 4);//MOSI   PE14GPIOE->MODER &= (~(0x3 <<28));GPIOE->MODER |= (0x1 <<28);GPIOE->OTYPER &= (~(0x1 << 14));GPIOE->OSPEEDR &= (~(0X3 << 28));GPIOE->PUPDR &= (~(0X3 <<28));//MOSI   PE13GPIOE->MODER &= (~(0x3 <<26));GPIOE->OSPEEDR &= (~(0x3 << 26));GPIOE->PUPDR &= (~(0x3 <<26));//MOSI   PE12GPIOE->MODER &= (~(0x3 <<24));GPIOE->MODER |= (0x1 <<24);GPIOE->OTYPER &= (~(0x1 << 12));GPIOE->OSPEEDR &= (~(0X3 << 24));GPIOE->PUPDR &= (~(0X3 <<24));//MOSI   PE11GPIOE->MODER &= (~(0x3 <<22));GPIOE->MODER |= (0x1 <<22);GPIOE->OTYPER &= (~(0x1 << 11));GPIOE->OSPEEDR &= (~(0X3 << 22));GPIOE->PUPDR &= (~(0X3 <<22));NSS_OUTPUT_L();//595芯片的锁存引脚拉低SCK_OUTPUT_L();//SPI的时钟线拉低
}void SPI_write(unsigned char dat)
{unsigned char i;for(i = 0;i<8;i++){if(dat & 0x01){MOSI_OUTPUT_H();//MOSI线写高}else{MOSI_OUTPUT_L();//MOSI线写低}dat >>=1;//时钟线从低电平到高电平的变化时，MOSI数据线上的数据//被写到595芯片的移位寄存器中SCK_OUTPUT_L();delay_us1(10);SCK_OUTPUT_H();delay_us1(10);}
}

main.c

#include "spi.h"extern void printf(const char *fmt,...);void delay_ms(int ms){int i,j;for(i=0;i<ms;i++)for(j=0;j<1800;j++);}//保存0-9编码的数组int num[10] = {0xFC,0x60,0xDA,0xF2,0x66,0xB6,0x3E,0xE0,0xFE,0xF6};int num2[4] = {0x80,0x40,0x20,0x10};int main(void){unsigned char i;SPI_init();//si7006_init();while(1){for(i=0;i<4;i++){SPI_write(num2[i]);//发送数码管的位SPI_write(num[i]);//发送数码管的段NSS_OUTPUT_L();delay_ms(1);NSS_OUTPUT_H();//锁存的时钟从低到高的变化//将位移寄存器中的数据锁存到锁存寄存器中delay_ms(5);}}return 0;}

将温湿度数据显示到数码

main.c

#include "spi.h"#include "si7006.h"extern void printf(const char *fmt,...);void delay_ms(int ms){int i,j;for(i=0;i<ms;i++)for(j=0;j<1800;j++);}//保存0-9编码的数组int num[10] = {0xFC,0x60,0xDA,0xF2,0x66,0xB6,0x3E,0xE0,0xFE,0xF6};int num2[4] = {0x80,0x40,0x20,0x10};int arr[4];unsigned short hum;short tem;int main(void){unsigned char i;SPI_init();si7006_init();while(1){tem=si7006_read_temp_data(0X40,0XE3);tem=175.72*tem/65536-46.85;hum=si7006_read_hum_data(0X40,0XE5);hum=125*hum/65536-6;arr[0]=tem/10;arr[1]=tem%10;arr[2]=hum/10;arr[3]=hum%10;for(int j=0;j<1000;j++){for(i=0;i<4;i++){SPI_write(num2[i]);//发送数码管的位SPI_write(num[arr[i]]);//发送数码管的段NSS_OUTPUT_L();delay_ms(1);NSS_OUTPUT_H();//锁存的时钟从低到高的变化//将位移寄存器中的数据锁存到锁存寄存器中}}}return 0;}