赞
踩
今日开始快速掌握这款STM32F103RCT6芯片的环境与编程开发,有关基础知识的部分不会多唠,直接实践与运用!文章贴出代码测试工程与测试效果图:
目录
配置初始化串口1,使用串口1周期性发送数据给上位机。
- #include "stdarg.h" //自定义printf需要使用
- #include "stdio.h" //1.61328125kb
- #include "USART1.h"
- #include "USART1.h"
-
- #define USART_REC_LEN 30
-
- u8 USART_RX_BUF[USART_REC_LEN] __attribute__ ((at(0X20001000)));
- //接收缓冲,最大USART_REC_LEN个字节,起始地址为0X20001000.
- u16 USART_RX_STA=0; //接收状态标记
- u16 USART_RX_CNT=0; //接收的字节数
-
-
- #if 1
- #pragma import(__use_no_semihosting)
- //标准库需要的支持函数
- struct __FILE
- {
- int handle;
- /* Whatever you require here. If the only file you are using is */
- /* standard output using printf() for debugging, no file handling */
- /* is required. */
- };
- /* FILE is typedef’ d in stdio.h. */
- FILE __stdout;
- //定义_sys_exit()以避免使用半主机模式
- void _sys_exit(int x)
- {
- x = x;
- }
- //重定向fputc函数
- //printf的输出,指向fputc,由fputc输出到串口
- //这里使用串口1(USART1)输出printf信息
- int fputc(int ch, FILE *f)
- {
- while((USART1->SR&0X40)==0);//循环发送,直到发送完毕
- USART1->DR = (u8) ch;
- return ch;
- }
- #endif
-

- void uart1_init(u32 bound){
- //GPIO端口设置(初始化)
- GPIO_InitTypeDef GPIO_InitStructure;
- USART_InitTypeDef USART_InitStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
-
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
- //使能USART1,GPIOA时钟
-
- //USART1_TX GPIOA.9
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
- GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9
-
- //USART1_RX GPIOA.10初始化
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
- GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10
-
- //Usart1 NVIC 配置
- NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
- NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
-
- //USART 初始化设置
-
- USART_InitStructure.USART_BaudRate = bound;//串口波特率
- USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
- USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
- USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
-
- USART_Init(USART1, &USART_InitStructure); //初始化串口1
- USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断
- USART_Cmd(USART1, ENABLE); //使能串口1
-
- }
-

- #ifndef _USART1_H_
- #define _USART1_H_
-
- #include "headfire.h"
-
-
- void uart1_init(u32 bound);
-
- #endif
-
-
- int main(void)
- {
- uint16_t t;
-
- delay_init();
- NVIC_Configuration();
- uart1_init(115200);
- printf("welcome!\r\n");
-
-
- while(1)
- {
- printf("%d\r\n",t);
- t++;
- delay_ms(500);
-
- }
- }

Copyright © 2003-2013 www.wpsshop.cn 版权所有,并保留所有权利。