1.2 作业-编程知识

1.2 作业

spi.h

#ifndef __SPI_H__
#define __SPI_H__#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"
// MOSI对应的引脚输出高低电平的信号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)/** 函数功能： SPI初始化函数，推挽输出，高速，禁止上拉和下拉* 函数参数：无* 函数返回值：无
*/
void SPI_init(void);
/** 函数功能：SPI发送数据的函数* 函数参数：dat : 要发送的数据* 函数返回值：无*
*/
void SPI_write(unsigned char dat);void delay_us1(unsigned int us);#endif  // __SPI_H__

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    PE14 GPIOE->MODER &= (~(0x3 << 28));GPIOE->MODER |= (0x1 << 28);GPIOE->OTYPER &= (~(0x1 << 14));GPIOE->OSPEEDR &= (~(0x3 << 28));GPIOE->PUPDR &= (~(0x3 << 28));// MISO    PE13GPIOE->MODER &= (~(0x3 << 26));GPIOE->OSPEEDR &= (~(0x3 << 26));GPIOE->PUPDR &= (~(0x3 << 26));// SCK     PE12 GPIOE->MODER &= (~(0x3 << 24));GPIOE->MODER |= (0x1 << 24);GPIOE->OTYPER &= (~(0x1 << 12));GPIOE->OSPEEDR &= (~(0x3 << 24));GPIOE->PUPDR &= (~(0x3 << 24));// NSS     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();   // SCK拉低delay_us1(1);SCK_OUTPUT_H();   // SCK拉高delay_us1(10);}}

mian.c

#include "spi.h"#include "si7006.h"#include "key_it.h"void delay_mas(unsigned int ms){for(int i=0;i<ms;i++){for(int j=0;j<1800;j++);}}int math[10]={0xFC,0x60,0xDA,0xF2,0x66,0xB6,0x3E,0xE0,0xFE,0xF6};unsigned short hum,tem;int main(){key1_it_config();SPI_init();si7006_init();while(1){hum=si7006_read_hum_data(0x40,0xE5);hum=125*hum/65536-6;int hum_m=hum/10;int hum_l=hum%10;tem=si7006_read_temp_data(0x40,0xE3);tem=175.72*tem/65536-46.85;int tem_m=tem/10;int tem_l=tem%10;for(int i=0;i<10000;i++){SPI_write(0x80);SPI_write(math[hum_m]);NSS_OUTPUT_L();delay_us1(10);NSS_OUTPUT_H();delay_us1(10);SPI_write(0x40);SPI_write(math[hum_l]);NSS_OUTPUT_L();delay_us1(10);NSS_OUTPUT_H();delay_us1(10);SPI_write(0x20);SPI_write(math[tem_m]);NSS_OUTPUT_L();delay_us1(10);NSS_OUTPUT_H();delay_us1(10);SPI_write(0x10);SPI_write(math[tem_l]);NSS_OUTPUT_L();delay_us1(10);NSS_OUTPUT_H();delay_us1(10);}}return 0;}

j结果：