forked from logzhan/RobotHardware-UESTC
128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/******************** (C) COPYRIGHT 2023 GeekRebot *****************************
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* File Name : bluetooth.c
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* Current Version : V1.0 & ST 3.5.0
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* Author : zhanli 719901725@qq.com
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* Date of Issued : 2023.04.06 zhanli: Create
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* Comments : GeekRebot 蓝牙驱动模块,使用HC05蓝牙模块，串口透传功能，
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和使用串口差不多，使用stm32 的uart2。蓝牙模块只需要接四
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个接口，TXD，RXD，5V，GND
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1. PA2 -> 蓝牙RXD 2.PA3 -> 蓝牙TXD
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********************************************************************************/
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#include "bluetooth.h"
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#include <stdio.h>
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volatile unsigned char *rx2_address;
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volatile unsigned int rx2_count;
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volatile unsigned int rx2_length;
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/**----------------------------------------------------------------------
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* Function : Bluetooth_Init
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* Description : 串口1初始化函数,PA2->RXD, PA3->TXD, bound为设置波特率
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* Author : zhanli&719901725@qq.com
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* Date : 2023/05/20 zhanli
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*---------------------------------------------------------------------**/
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void Bluetooth_Init(u32 bound)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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USART_InitTypeDef USART_InitStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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/* Config USART2 clock */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
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/* USART2 GPIO config */
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/* Configure USART2 Tx (PA.02) as alternate function push-pull */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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/* Configure USART2 Rx (PA.03) as input floating */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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/* USART2 mode config */
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USART_InitStructure.USART_BaudRate = bound;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No ;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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USART_Init(USART2, &USART_InitStructure);
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/* Configure the NVIC Preemption Priority Bits */
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
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/* Enable the USARTy Interrupt */
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NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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/* 使能串口1接收中断 */
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USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
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USART_Cmd(USART2, ENABLE);
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}
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/**----------------------------------------------------------------------
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* Function : USART2_Send
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* Description : 蓝牙通过USART2发送到手机
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* Author : zhanli&719901725@qq.com
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* Date : 2023/05/20 zhanli
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*---------------------------------------------------------------------**/
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void USART2_Send(unsigned char *tx_buf, int len)
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{
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USART_ClearFlag(USART2, USART_FLAG_TC);
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USART_ClearITPendingBit(USART2, USART_FLAG_TXE);
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while(len--)
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{
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USART_SendData(USART2, *tx_buf);
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while(USART_GetFlagStatus(USART2, USART_FLAG_TC) != 1);
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USART_ClearFlag(USART2, USART_FLAG_TC);
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USART_ClearITPendingBit(USART2, USART_FLAG_TXE);
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tx_buf++;
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}
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}
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/**----------------------------------------------------------------------
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* Function : USART2_Receive
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* Description : 蓝牙接受，从手机接收
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* Author : zhanli&719901725@qq.com
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* Date : 2023/05/20 zhanli
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*---------------------------------------------------------------------**/
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void USART2_Receive(unsigned char *rx_buf, int len)
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{
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rx2_count = 0;
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rx2_length = len;
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rx2_address = rx_buf;
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}
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/**----------------------------------------------------------------------
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* Function : USART2_Receive
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* Description : 串口2中断函数
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* Author : zhanli&719901725@qq.com
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* Date : 2023/05/20 zhanli
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*---------------------------------------------------------------------**/
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void USART2_IRQHandler(void)
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{
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unsigned char Res;
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// 接收中断(接收到的数据必须是0x0d 0x0a结尾)
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if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
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{
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Res = USART_ReceiveData(USART2);
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if(rx2_length > rx2_count)
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{
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*rx2_address = Res;
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rx2_address++;
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rx2_count++;
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}
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USART_ClearITPendingBit(USART2, USART_IT_RXNE);
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}
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}
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