stm32f030c8t6的i2c，spi，串口

#include "delay.h" #include "iic.h" #include "stm32f0xx_gpio.h" #include "stm32f0xx_rcc.h" #include "stdio.h" void iic_init(void) //icc初始化 { //PB8-sCL PB9-sDa //开启PB的使能时钟 RCC->AHBENR |=0x01<<18; //配置模式-输出 GPIOB->MODER &=~((0x03<<(2*8))|(0x03<<(2*9)|(0x01<<24))); GPIOB->MODER |=(0x01<<(2*8))|((0x01)<<(2*9)); //配置输出类型-开漏 GPIOB->OTYPER &=~((0x03<<8)|(0x03<<9)); GPIOB->OTYPER |=(0x01<<8)|(0x01<<9); //配置输出速率-2M GPIOB->OSPEEDR &=~((0x03<<(2*8))|(0x03<<(2*9))); //配置上下拉-X浮空,,上拉 // GPIOB->PUPDR |=(0x01<<(2*8))|(0x01<<(2*9)); GPIOB->PUPDR &=~((0x01<<(2*8))|(0x01<<(2*9))); GPIOB->ODR |=0x01<<8; GPIOB->ODR |=0x01<<9; } //产生iic起始信号 void iic_start(void) { GPIOB->ODR |=0x01<<9; delay_us(1); GPIOB->ODR |=0x01<<8; delay_us(3); GPIOB->ODR &=~(0x01<<9);//sTaRT:when CLK is high,DaTa change form high to low delay_us(4); GPIOB->ODR &=~(0x01<<8);//钳住I2C总线，准备发送或接收数据 } //产生iic停止信号 void iic_stop(void) { GPIOB->ODR &=~(0x01<<8); GPIOB->ODR &=~(0x01<<9);//sTOP:when CLK is high DaTa change form low to high delay_us(4); GPIOB->ODR |=0x01<<8;//发送I2C总线结束信号 delay_us(1); GPIOB->ODR |=0x01<<9;//发送I2C总线结束信号 delay_us(4); } //等待应答信号到来 //返回值：1，接收应答失败 // 0，接收应答成功 u8 iic_read_ack(void) { u8 ucErrTime=0; GPIOA->ODR |=0x01<<9; delay_us (2); GPIOB->ODR |=0x01<<8; //sDa设置为输入 delay_us (2); while(GPIOB ->IDR &GPIO_Pin_9) { ucErrTime++; printf(" %d ",ucErrTime); if(ucErrTime>250) { iic_stop(); return 1; } } GPIOB->ODR |=0x01<<8; return 0; } //不产生aCK应答 void iic_nack(void) { GPIOB->ODR &=~(0x01<<8); GPIOB->ODR |=0x01<<9; delay_us(2); GPIOB->ODR |=0x01<<8; delay_us(2); GPIOB->ODR &=~(0x01<<8); } //iic发送一个字节 //返回从机有无应答 //1，有应答 //0，无应答 void iic_write_byte(u8 data) { u8 i; for(i=0;i<8;i++) { if(data & 0x80) //取出data最高位，如果为1 { //printf(" %d ",data & 0x80); GPIOB->ODR |=0x01<<9; } else //取出data最高位，如果为0 { GPIOB->ODR &=~(0x01<<9); // printf(" %d ",data & 0x80); } data=data<<1; delay_us(2); GPIOB->ODR |=0x01<<8; delay_us(2); GPIOB->ODR &=~(0x01<<8); delay_us(2); } GPIOB->ODR |=0x01<<8; //方便下一步操作 } //读1个字节，ack=1时，发送aCK，ack=0，发送naCK u8 iic_read_byte(u8 ack) { unsigned char i,data=0; //sDa设置为输入 GPIOB->ODR &=~(0x01<<9); GPIOB ->MODER &=~(0x03<<18); delay_us(1); GPIOB->ODR &=~(0x01<<8); for(i=0;i<8;i++) { GPIOB->ODR &=~(0x01<<8); delay_us(2); GPIOB->ODR |=0x01<<8; data<<=1; //printf("%d",GPIOB->IDR &0X01<<9); if(GPIOB->IDR &0X01<<9) data++; delay_us(1); } GPIOB->ODR &=~(0x01<<8); if (!ack) iic_nack();//发送naCK else iic_write_ack(); //发送aCK GPIOB ->MODER |=0x01<<18; return data; } void iic_write_ack(void) { GPIOB->ODR &=~(0x01<<8); GPIOB->ODR &=~(0x01<<9); delay_us(2); GPIOB->ODR |=0x01<<8; delay_us(2); GPIOB->ODR &=~(0x01<<9); }