STC15W4K16S4的串口通信（环形队列缓冲区）

#include "USART.h" COMx_Define COM1,COM2; u8 xdata TX1_Buffer[COM_TX1_Lenth]; //发送缓冲 u8 xdata RX1_Buffer[COM_RX1_Lenth]; //接收缓冲 u8 xdata TX2_Buffer[COM_TX2_Lenth]; //发送缓冲 u8 xdata RX2_Buffer[COM_RX2_Lenth]; //接收缓冲 u8 USART_Configuration(u8 UARTx, COMx_InitDefine *COMx) { u8 i; u32 j; if(UARTx == USART1) { COM1.id = 1; COM1.TX_read = 0; COM1.TX_write = 0; COM1.B_TX_busy = 0; COM1.RX_Cnt = 0; COM1.RX_TimeOut = 0; COM1.B_RX_OK = 0; for(i=0; i<COM_TX1_Lenth; i++) TX1_Buffer[i] = 0; for(i=0; i<COM_RX1_Lenth; i++) RX1_Buffer[i] = 0; if(COMx->UART_Mode > UART_9bit_BRTx) return 2; //模式错误 if(COMx->UART_Polity == PolityHigh) PS = 1; //高优先级中断 else PS = 0; //低优先级中断 SCON = (SCON & 0x3f) | COMx->UART_Mode; if((COMx->UART_Mode == UART_9bit_BRTx) ||(COMx->UART_Mode == UART_8bit_BRTx)) //可变波特率 { j = (MAIN_Fosc / 4) / COMx->UART_BaudRate; //按1T计算 if(j >= 65536UL) return 2; //错误 j = 65536UL - j; if(COMx->UART_BRT_Use == BRT_Timer1) { TR1 = 0; AUXR &= ~0x01; //S1 BRT Use Timer1; TMOD &= ~(1<<6); //Timer1 set As Timer TMOD &= ~0x30; //Timer1_16bitAutoReload; AUXR |= (1<<6); //Timer1 set as 1T mode TH1 = (u8)(j>>8); TL1 = (u8)j; ET1 = 0; //禁止中断 TMOD &= ~0x40; //定时 INT_CLKO &= ~0x02; //不输出时钟 TR1 = 1; } else if(COMx->UART_BRT_Use == BRT_Timer2) { AUXR &= ~(1<<4); //Timer stop AUXR |= 0x01; //S1 BRT Use Timer2; AUXR &= ~(1<<3); //Timer2 set As Timer AUXR |= (1<<2); //Timer2 set as 1T mode TH2 = (u8)(j>>8); TL2 = (u8)j; IE2 &= ~(1<<2); //禁止中断 AUXR &= ~(1<<3); //定时 AUXR |= (1<<4); //Timer run enable } else return 2; //错误 } else if(COMx->UART_Mode == UART_ShiftRight) { if(COMx->BaudRateDouble == ENABLE) AUXR |= (1<<5); //固定波特率SysClk/2 else AUXR &= ~(1<<5); //固定波特率SysClk/12 } else if(COMx->UART_Mode == UART_9bit) //固定波特率SysClk*2^SMOD/64 { if(COMx->BaudRateDouble == ENABLE) PCON |= (1<<7); //固定波特率SysClk/32 else PCON &= ~(1<<7); //固定波特率SysClk/64 } if(COMx->UART_Interrupt == ENABLE) ES = 1; //允许中断 else ES = 0; //禁止中断 if(COMx->UART_RxEnable == ENABLE) REN = 1; //允许接收 else REN = 0; //禁止接收 P_SW1 = (P_SW1 & 0x3f) | (COMx->UART_P_SW & 0xc0); //切换IO if(COMx->UART_RXD_TXD_Short == ENABLE) PCON2 |= (1<<4); //内部短路RXD与TXD, 做中继, ENABLE,DISABLE else PCON2 &= ~(1<<4); return 0; } if(UARTx == USART2) { COM2.id = 2; COM2.TX_read = 0; COM2.TX_write = 0; COM2.B_TX_busy = 0; COM2.RX_Cnt = 0; COM2.RX_TimeOut = 0; COM2.B_RX_OK = 0; for(i=0; i<COM_TX2_Lenth; i++) TX2_Buffer[i] = 0; for(i=0; i<COM_RX2_Lenth; i++) RX2_Buffer[i] = 0; if((COMx->UART_Mode == UART_9bit_BRTx) ||(COMx->UART_Mode == UART_8bit_BRTx)) //可变波特率 { if(COMx->UART_Polity == PolityHigh) IP2 |= 1; //高优先级中断 else IP2 &= ~1; //低优先级中断 if(COMx->UART_Mode == UART_9bit_BRTx) S2CON |= (1<<7); //9bit else S2CON &= ~(1<<7); //8bit j = (MAIN_Fosc / 4) / COMx->UART_BaudRate; //按1T计算 if(j >= 65536UL) return 2; //错误 j = 65536UL - j; AUXR &= ~(1<<4); //Timer stop AUXR &= ~(1<<3); //Timer2 set As Timer AUXR |= (1<<2); //Timer2 set as 1T mode TH2 = (u8)(j>>8); TL2 = (u8)j; IE2 &= ~(1<<2); //禁止中断 AUXR |= (1<<4); //Timer run enable } else return 2; //模式错误 if(COMx->UART_Interrupt == ENABLE) IE2 |= 1; //允许中断 else IE2 &= ~1; //禁止中断 if(COMx->UART_RxEnable == ENABLE) S2CON |= (1<<4); //允许接收 else S2CON &= ~(1<<4); //禁止接收 P_SW2 = (P_SW2 & ~1) | (COMx->UART_P_SW & 0x01); //切换IO } } /*************** 装载串口发送缓冲 *******************************/ void TX1_write2buff(u8 dat) //写入发送缓冲，指针+1 { TX1_Buffer[COM1.TX_write] = dat; //装发送缓冲 if(++COM1.TX_write >= COM_TX1_Lenth) COM1.TX_write = 0; if(COM1.B_TX_busy == 0) //空闲 { COM1.B_TX_busy = 1; //标志忙 TI = 1; //触发发送中断 } } void TX2_write2buff(u8 dat) //写入发送缓冲，指针+1 { TX2_Buffer[COM2.TX_write] = dat; //装发送缓冲 if(++COM2.TX_write >= COM_TX2_Lenth) COM2.TX_write = 0; if(COM2.B_TX_busy == 0) //空闲 { COM2.B_TX_busy = 1; //标志忙 SET_TI2(); //触发发送中断 } } void PrintString1(u8 *puts) { for (; *puts != 0; puts++) TX1_write2buff(*puts); //遇到停止符0结束 } void PrintString2(u8 *puts) { for (; *puts != 0; puts++) TX2_write2buff(*puts); //遇到停止符0结束 } /* void COMx_write2buff(COMx_Define *COMx, u8 dat) //写入发送缓冲，指针+1 { if(COMx->id == 1) TX1_write2buff(dat); if(COMx->id == 2) TX2_write2buff(dat); } void PrintString(COMx_Define *COMx, u8 *puts) { for (; *puts != 0; puts++) COMx_write2buff(COMx,*puts); //遇到停止符0结束 } */ /********************* UART1中断函数************************/ void UART1_int (void) interrupt UART1_VECTOR { if(RI) { RI = 0; if(COM1.B_RX_OK == 0) { if(COM1.RX_Cnt >= COM_RX1_Lenth) COM1.RX_Cnt = 0; RX1_Buffer[COM1.RX_Cnt++] = SBUF; COM1.RX_TimeOut = TimeOutSet1; } } if(TI) { TI = 0; if(COM1.TX_read != COM1.TX_write) { SBUF = TX1_Buffer[COM1.TX_read]; if(++COM1.TX_read >= COM_TX1_Lenth) COM1.TX_read = 0; } else COM1.B_TX_busy = 0; } } /********************* UART2中断函数************************/ void UART2_int (void) interrupt UART2_VECTOR { if(RI2) { CLR_RI2(); if(COM2.B_RX_OK == 0) { if(COM2.RX_Cnt >= COM_RX2_Lenth) COM2.RX_Cnt = 0; RX2_Buffer[COM2.RX_Cnt++] = S2BUF; COM2.RX_TimeOut = TimeOutSet2; } } if(TI2) { CLR_TI2(); if(COM2.TX_read != COM2.TX_write) { S2BUF = TX2_Buffer[COM2.TX_read]; if(++COM2.TX_read >= COM_TX2_Lenth) COM2.TX_read = 0; } else COM2.B_TX_busy = 0; } }