438 lines
11 KiB
C
438 lines
11 KiB
C
/*************************************************************************!
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* 技术讨论：QQ群 123763203
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* 官网 ：www.navota.com
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*
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* @file uart.c
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* @brief uart通讯接口函数库
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* @author Navota
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* @date 2017-1-1
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*************************************************************************/
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#include "uart.h"
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/*!
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* @brief 存放回调入口
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*
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*/
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UART_CallbackType UART_Callback = NULL;
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/******************************************************************************
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* 定义UART的接口函数
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*******************************************************************************/
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/*****************************************************************************//*!
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*
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* @brief 初始化UART,关中断,无硬件流控制.
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*
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* @param[in] pUART 指向三个UART其中一个的基址
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* @param[in] pConfig 配置UART的结构体
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*
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* @return none
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*
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*****************************************************************************/
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void UART_Init(UART_Type *pUART, UART_ConfigType *pConfig)
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{
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uint16_t u16Sbr;
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uint8_t u8Temp;
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uint32_t u32SysClk = pConfig->u32SysClkHz;//定义系统时钟
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uint32_t u32Baud = pConfig->u32Baudrate;//定义波特率
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/* 合法性检查 */
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ASSERT((pUART == UART0) || (pUART == UART1) || (pUART == UART2));
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/* 设置时钟选通控制用来选择相应的 UART 口 */
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if (pUART == UART0)
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{
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SIM->SCGC |= SIM_SCGC_UART0_MASK;//使能相应功能位， 选通对应 UART
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}
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#if defined(CPU_NV32)
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else if (pUART == UART1)
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{
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SIM->SCGC |= SIM_SCGC_UART1_MASK;
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}
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else
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{
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SIM->SCGC |= SIM_SCGC_UART2_MASK;
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}
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#endif
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/*确保在我们进行配置时， 禁止发送和接收*/
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pUART->C2 &= ~(UART_C2_TE_MASK | UART_C2_RE_MASK );
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/* 配置 UART 为 8 位模式, 无奇偶校验位 */
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pUART->C1 = 0;
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/* 波特率计算 */
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u16Sbr = (((u32SysClk)>>4) + (u32Baud>>1))/u32Baud;
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/*把当前数据存放在串口波特率寄存器中， 且SBR位清0，即波特率发生器被禁止*/
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u8Temp = pUART->BDH & ~(UART_BDH_SBR_MASK);
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pUART->BDH = u8Temp | UART_BDH_SBR(u16Sbr >> 8);
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pUART->BDL = (uint8_t)(u16Sbr & UART_BDL_SBR_MASK);
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/*使能 UART 接收和发送 */
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pUART->C2 |= (UART_C2_TE_MASK | UART_C2_RE_MASK );
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}
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/*****************************************************************************//*!
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*
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* @brief 接收一个字符.
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*
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* @param[in] pUART 指向三个UART其中一个的基址
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*
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* @return 接收到的字符
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*
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*****************************************************************************/
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uint8_t UART_GetChar(UART_Type *pUART)
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{
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/* 合法性检测 */
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ASSERT((pUART == UART0) || (pUART == UART1) || (pUART == UART2));
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/* 等待直到一个字符被接收 */
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while (!(pUART->S1 & UART_S1_RDRF_MASK));
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/* 返回接收到的8位数据 */
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return pUART->D;
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}
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/*****************************************************************************//*!
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*
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* @brief 发送一个字符.
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*
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* @param[in] pUART 指向三个UART其中一个的基址
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* @param[in] u8Char 要发送的字符
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*
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* @return none
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*
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*****************************************************************************/
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void UART_PutChar(UART_Type *pUART, uint8_t u8Char)
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{
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/* 一直等待， 直到缓冲区为空 */
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while (!(pUART->S1 & UART_S1_TDRE_MASK));
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/* 发送字符到数据寄存器 */
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pUART->D = (uint8_t)u8Char;
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}
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/*****************************************************************************//*!
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*
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* @brief 波特率设置.
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*
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* @param[in] pUART 指向三个UART其中一个的基址
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* @param[in] pConfig 波特率相关配置结构体
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*
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* @return none
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*
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*****************************************************************************/
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void UART_SetBaudrate(UART_Type *pUART, UART_ConfigBaudrateType *pConfig)
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{
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uint8_t u8Temp;
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uint16_t u16Sbr;
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uint32_t u32SysClk = pConfig->u32SysClkHz;
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uint32_t u32baud = pConfig->u32Baudrate;
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/* 合法性检测 */
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ASSERT((pUART == UART0) || (pUART == UART1) || (pUART == UART2));
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/*计算波特率，四舍五入提高精度 */
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u16Sbr = (((u32SysClk)>>4) + (u32baud>>1))/u32baud;
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u8Temp = pUART->BDH & ~(UART_BDH_SBR_MASK);
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pUART->BDH = u8Temp | UART_BDH_SBR(u16Sbr >> 8);
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pUART->BDL = (uint8_t)(u16Sbr & UART_BDL_SBR_MASK);
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pUART->C2 |= (UART_C2_TE_MASK | UART_C2_RE_MASK );
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}
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/*****************************************************************************//*!
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*
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* @brief 使能UART中断.
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*
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* @param[in] pUART 指向三个UART其中一个的基址
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* @param[in] InterruptType 中断的类型
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*
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* @return none
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*
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*****************************************************************************/
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void UART_EnableInterrupt(UART_Type *pUART, UART_InterruptType InterruptType)
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{
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/* 通道合法性检查 */
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ASSERT((pUART == UART0) || (pUART == UART1) || (pUART == UART2));
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if (InterruptType == UART_TxBuffEmptyInt) //发送中断使能
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{
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pUART->C2 |= UART_C2_TIE_MASK;
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}
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else if (InterruptType == UART_TxCompleteInt) //传输完成中断使能
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{
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pUART->C2 |= UART_C2_TCIE_MASK;
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}
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else if (InterruptType == UART_RxBuffFullInt) //接收器中断使能
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{
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pUART->C2 |= UART_C2_RIE_MASK;
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}
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else if (InterruptType == UART_IdleLineInt) //空闲线中断使能
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{
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pUART->C2 |= UART_C2_ILIE_MASK;
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}
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else if (InterruptType == UART_RxOverrunInt) //过载中断使能
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{
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pUART->C3 |= UART_C3_ORIE_MASK;
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}
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else if (InterruptType == UART_NoiseErrorInt) //噪声错误中断使能
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{
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pUART->C3 |= UART_C3_NEIE_MASK;
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}
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else if (InterruptType == UART_FramingErrorInt) //帧错误中断使能
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{
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pUART->C3 |= UART_C3_FEIE_MASK;
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}
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else if (InterruptType == UART_ParityErrorInt) //奇偶校验中断使能
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{
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pUART->C3 |= UART_C3_FEIE_MASK;
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}
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else
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{
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//其他暂不支持类型的中断
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}
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}
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/*****************************************************************************//*!
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*
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* @brief 禁用UART中断.
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*
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* @param[in] 指向三个UART其中一个的基址
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* @param[in] 中断的类型
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*
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* @return none
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*
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*****************************************************************************/
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void UART_DisableInterrupt(UART_Type *pUART, UART_InterruptType InterruptType)
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{
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/* 通道合法性检查 */
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ASSERT((pUART == UART0) || (pUART == UART1) || (pUART == UART2));
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if (InterruptType == UART_TxBuffEmptyInt) //发送中断禁用
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{
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pUART->C2 &= (~UART_C2_TIE_MASK);
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}
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else if (InterruptType == UART_TxCompleteInt) //传输完成中断禁用
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{
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pUART->C2 &= (~UART_C2_TCIE_MASK);
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}
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else if (InterruptType == UART_RxBuffFullInt) //接收器中断禁用
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{
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pUART->C2 &= (~UART_C2_RIE_MASK);
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}
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else if (InterruptType == UART_IdleLineInt) //空闲线中断禁用
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{
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pUART->C2 &= (~UART_C2_ILIE_MASK);
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}
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else if (InterruptType == UART_RxOverrunInt) //过载中断禁用
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{
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pUART->C3 &= (~UART_C3_ORIE_MASK);
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}
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else if (InterruptType == UART_NoiseErrorInt) //噪声错误中断禁用
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{
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pUART->C3 &= (~UART_C3_NEIE_MASK);
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}
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else if (InterruptType == UART_FramingErrorInt) //帧错误中断禁用
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{
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pUART->C3 &= (~UART_C3_FEIE_MASK);
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}
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else if (InterruptType == UART_ParityErrorInt) //奇偶校验中断禁用
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{
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pUART->C3 &= (~UART_C3_FEIE_MASK);
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}
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else
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{
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//其他暂不支持类型的中断
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}
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}
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/*****************************************************************************//*!
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*
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* @brief 从两个状态寄存器获取UART状态
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*
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* @param[in] pUART 指向三个UART其中一个的基址
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*
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* @return 16位的状态
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*
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*****************************************************************************/
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uint16_t UART_GetFlags(UART_Type *pUART)
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{
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uint16_t u16StatusFlags = 0;//先清空标志位
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u16StatusFlags = pUART->S2; //将状态寄存器 2 的值赋给标志参数
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u16StatusFlags = (u16StatusFlags<<8)| pUART->S1; //两个状态寄存器拼接赋给标志参数
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return u16StatusFlags;//返回标志参数的值
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}
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/*****************************************************************************//*!
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*
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* @brief 检查特定的位是否置位.
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*
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* @param[in] pUART 指向三个UART其中一个的基址
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* @param[in] FlagType 位的类型
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*
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* @return
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* 1, 标志置位
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* 0, 标志清零
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*
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*****************************************************************************/
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uint8_t UART_CheckFlag(UART_Type *pUART, UART_FlagType FlagType)
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{
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uint16_t u16StatusFlags = 0;
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u16StatusFlags = UART_GetFlags(pUART);
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return (u16StatusFlags & (1<<FlagType));
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}
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/*****************************************************************************//*!
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*
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* @brief 用查询模式发送字符串.
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*
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* @param[in] pUART 指向三个UART其中一个的基址
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* @param[in] pSendBuff 字符串首地址
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* @param[in] u32Length 字符串的长度
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*
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* @return none
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*
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*****************************************************************************/
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void UART_SendWait(UART_Type *pUART, uint8_t *pSendBuff, uint32_t u32Length)
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{
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uint8_t u8TxChar;
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uint32_t i;
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for (i = 0; i < u32Length; i++)
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{
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u8TxChar = pSendBuff[i];
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while (!UART_IsTxBuffEmpty(pUART))
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{
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#if defined(ENABLE_WDOG)
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WDOG_Feed();
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#endif
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}
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UART_WriteDataReg(pUART, u8TxChar);
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}
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}
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/*****************************************************************************//*!
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*
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* @brief 用查询模式接收字符串.
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*
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* @param[in] pUART 指向三个UART其中一个的基址
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* @param[in] pReceiveBuff 定义接收字符串的首地址
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* @param[in] u32Length 所要接收字符串的长度
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*
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* @return none
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*
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*****************************************************************************/
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void UART_ReceiveWait(UART_Type *pUART, uint8_t *pReceiveBuff, uint32_t u32Length)
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{
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uint8_t u8RxChar;
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uint32_t i;
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for (i = 0; i < u32Length; i++)
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{
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while (!UART_IsRxBuffFull(pUART))
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{
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#if defined(ENABLE_WDOG)
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WDOG_Feed();
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#endif
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}
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u8RxChar = UART_ReadDataReg(pUART);
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pReceiveBuff[i] = u8RxChar;
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}
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}
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/*****************************************************************************//*!
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*
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* @brief 等待发送完成.
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*
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* @param[in] pUART 指向三个UART其中一个的基址
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*
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* @return none
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*
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*****************************************************************************/
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void UART_WaitTxComplete(UART_Type *pUART)
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{
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while (!UART_IsTxComplete(pUART));//一直等待直到发送完成
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}
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/*****************************************************************************//*!
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*
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* @brief 设置UART模块的中断回调函数.
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*
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* @param[in] pfnCallback 回调函数的地址
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*
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* @return none
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*
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*****************************************************************************/
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void UART_SetCallback(UART_CallbackType pfnCallback)
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{
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UART_Callback = pfnCallback;
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}
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/*! @} */
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/*****************************************************************************//*!
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*
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* @brief uart0 中断服务函数.
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*
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* @param none
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*
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* @return none
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*
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*****************************************************************************/
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void UART0_Isr(void)
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{
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UART_Callback(UART0);
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}
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#if defined(CPU_NV32)
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/*****************************************************************************//*!
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*
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* @brief uart0 中断服务函数.
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*
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* @param none
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*
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* @return none
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*
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*****************************************************************************/
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void UART1_Isr(void)
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{
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UART_Callback(UART1);
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}
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/*****************************************************************************//*!
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*
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* @brief uart0 中断服务函数.
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*
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* @param none
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*
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* @return none
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*
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*****************************************************************************/
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void UART2_Isr(void)
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{
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UART_Callback(UART2);
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}
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#endif
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