187 lines
4.5 KiB
C
187 lines
4.5 KiB
C
/**
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******************************************************************************
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* @file bsp_485.c
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* @author fire
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* @version V1.0
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* @date 2019-xx-xx
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* @brief 485驱动
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******************************************************************************
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* @attention
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*
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* 实验平台:野火 STM32 H750 开发板
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* 论坛 :http://www.firebbs.cn
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* 淘宝 :http://fire-stm32.taobao.com
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*
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******************************************************************************
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*/
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#include "./485/bsp_485.h"
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#include <stdarg.h>
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static void Delay(__IO uint32_t nCount);
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UART_HandleTypeDef Uart2_Handle;
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/// 配置USART接收中断
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static void NVIC_Configuration(void)
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{
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/* 配置抢占优先级的分组 */
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HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_0);
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/*中断设置，抢占优先级0，子优先级为0*/
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HAL_NVIC_SetPriority(_485_INT_IRQ, 1 ,1);
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HAL_NVIC_EnableIRQ(_485_INT_IRQ);
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}
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/*
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* 函数名：_485_Config
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* 描述 ：USART GPIO 配置,工作模式配置
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* 输入 ：无
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* 输出 : 无
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* 调用 ：外部调用
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*/
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void _485_Config(void)
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{
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GPIO_InitTypeDef GPIO_InitStruct;
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_485_USART_RX_GPIO_CLK_ENABLE();
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_485_USART_TX_GPIO_CLK_ENABLE();
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_485_RE_GPIO_CLK_ENABLE();
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/* 使能 UART 时钟 */
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_485_USART_CLK_ENABLE();
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/**USART2 GPIO Configuration
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PD5 ------> USART2_TX
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PD6 ------> USART2_RX
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*/
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/* 配置Tx引脚为复用功能 */
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GPIO_InitStruct.Pin = _485_USART_TX_PIN;
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GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
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GPIO_InitStruct.Pull = GPIO_PULLUP;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
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GPIO_InitStruct.Alternate = _485_USART_TX_AF;
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HAL_GPIO_Init(_485_USART_TX_GPIO_PORT, &GPIO_InitStruct);
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/* 配置Rx引脚为复用功能 */
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GPIO_InitStruct.Pin = _485_USART_RX_PIN;
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GPIO_InitStruct.Alternate = _485_USART_RX_AF;
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HAL_GPIO_Init(_485_USART_RX_GPIO_PORT, &GPIO_InitStruct);
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/* 485收发控制管脚 */
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GPIO_InitStruct.Pin = _485_RE_PIN;
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GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_InitStruct.Pull = GPIO_PULLUP;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
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HAL_GPIO_Init(_485_RE_GPIO_PORT, &GPIO_InitStruct);
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/* 配置串485_USART 模式 */
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Uart2_Handle.Instance = _485_USART;
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Uart2_Handle.Init.BaudRate = _485_USART_BAUDRATE;
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Uart2_Handle.Init.WordLength = UART_WORDLENGTH_8B;
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Uart2_Handle.Init.StopBits = UART_STOPBITS_1;
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Uart2_Handle.Init.Parity = UART_PARITY_NONE;
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Uart2_Handle.Init.Mode = UART_MODE_TX_RX;
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Uart2_Handle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
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Uart2_Handle.Init.OverSampling = UART_OVERSAMPLING_16;
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HAL_UART_Init(&Uart2_Handle);
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/*串口1中断初始化 */
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NVIC_Configuration();
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/*配置串口接收中断 */
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__HAL_UART_ENABLE_IT(&Uart2_Handle,UART_IT_RXNE);
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//默认进入接收模式
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HAL_GPIO_WritePin(_485_RE_GPIO_PORT,_485_RE_PIN,GPIO_PIN_RESET);
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}
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/***************** 发送一个字符 **********************/
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//使用单字节数据发送前要使能发送引脚，发送后要使能接收引脚。
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void _485_SendByte( uint8_t ch )
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{
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/* 发送一个字节数据到USART2 */
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HAL_UART_Transmit(&Uart2_Handle, (uint8_t *)&ch, 1, 0xFFFF);
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while(__HAL_UART_GET_FLAG(&Uart2_Handle, UART_FLAG_TXE) == 0);
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}
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/***************** 发送指定长度的字符串 **********************/
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void _485_SendStr_length( uint8_t *str,uint32_t strlen )
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{
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unsigned int k=0;
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_485_TX_EN() ;// 使能发送数据
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do
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{
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_485_SendByte( *(str + k) );
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k++;
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} while(k < strlen);
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/*加短暂延时，保证485发送数据完毕*/
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Delay(0xFFF);
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_485_RX_EN() ;// 使能接收数据
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}
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/***************** 发送字符串 **********************/
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void _485_SendString( uint8_t *str)
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{
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unsigned int k=0;
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_485_TX_EN() ;// 使能发送数据
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do
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{
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_485_SendByte( *(str + k) );
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k++;
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} while(*(str + k)!='\0');
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/*加短暂延时，保证485发送数据完毕*/
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Delay(0xFFF);
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_485_RX_EN() ;// 使能接收数据
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}
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//中断缓存串口数据
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#define UART_BUFF_SIZE 1024
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volatile uint16_t uart_p = 0;
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uint8_t uart_buff[UART_BUFF_SIZE];
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void bsp_485_IRQHandler(void)
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{
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if(uart_p<UART_BUFF_SIZE)
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{
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if(__HAL_UART_GET_IT_SOURCE( &Uart2_Handle, UART_IT_RXNE ) != RESET)
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{
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HAL_UART_Receive(&Uart2_Handle, (uint8_t *)(&uart_buff[uart_p]),1 , 1000);
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uart_p++;
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}
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}
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else
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{
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clean_rebuff();
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}
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HAL_UART_IRQHandler(&Uart2_Handle);
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}
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//获取接收到的数据和长度
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char *get_rebuff(uint16_t *len)
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{
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*len = uart_p;
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return (char *)&uart_buff;
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}
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//清空缓冲区
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void clean_rebuff(void)
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{
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uint16_t i=UART_BUFF_SIZE+1;
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uart_p = 0;
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while(i)
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uart_buff[--i]=0;
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}
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static void Delay(__IO uint32_t nCount) //简单的延时函数
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{
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for(; nCount != 0; nCount--);
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}
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