UART.rar_DM643_dm643 uart

/************************************************************ Copyright (C), 2007 by SEED Electronic Technology LTD. FileName: UART.c Author: Ya.X Version : V1.0 Date:2007-09-20 Description: UART模块相关处理函数 *************************************************************/ #include "uart.h" /************************************************************ Function: UART_rget Description: 读取UART寄存器的值 Calls: No Called By: Input: channel: 通道号UART A or UART B. regnum: UART响应寄存器偏移地址 Output: No Return: 相应UART寄存器的值 Others: No ************************************************************/ Uint8 UART_rget(Uint32 channel, Uint16 regnum) { Uint8 *udata; udata = (Uint8 *)(DEC643_UART_BASE + channel + regnum); return (*udata & 0xff); } /*********************************************************** Function: UART_rset Description: 设置UART寄存器的值 Calls: No Called By: Input: channel: 通道号UART A or UART B. regnum: UART响应寄存器偏移地址 regval: 待设置寄存器值 Output: No Return: No Others: No ************************************************************/ void UART_rset(Uint32 channel, Uint16 regnum, Uint8 regval) { Uint8 *udata; udata = (Uint8 *)(DEC643_UART_BASE + channel + regnum); *udata = (regval &0xff); } /************************************************************ Function: UART_open Description: 打开UART设备,并返回一个Uint32的值 Calls: No Called By: Input: uart: 选择的uart端口 Output: No Return: 有效的Uint32位的值,如果为0xFFFFFFFF,则无效 Others: No ************************************************************/ extern Uint32 UART_open(UartId uart) { Uint32 ret_data; if(uart == 0) { ret_data = 0x00000000; return ret_data; } if(uart ==1) { ret_data = 0x00020000; return ret_data; } ret_data = 0xFFFFFFFF; return ret_data; } /************************************************************ Function: UART_setup Description: 创建UART通道 Calls: No Called By: Input: channel: 通道号,UART A or UART B UartBaud: UART波特率. UartWordLen: UART字长 UartStopBits: UART结束位 UartParity: UART极性 UartFifoControl: UART FIFO 控制 UartLoopway: UART loop. Output: No Return: No Others: No ************************************************************/ void UART_setup(Uint32 channel, Uint16 UartBaud, Uint8 UartWordLen, Uint8 UartStopBits, Uint8 UartParity, Uint8 UartFifoControl, Uint8 UartLoopway) { Uint8 baudratel,baudrateh,uartdata; /* Set clock divisor as "1" */ UART_rset(channel,UART_LCR,0xBF); UART_rset(channel,UART_EFR,0x10); UART_rset(channel,UART_LCR,0x00); UART_rset(channel,UART_MCR,0x00); /* Set baudrate. */ UART_rset(channel,UART_LCR,0x80); baudratel = (UartBaud & 0x00ff); UART_rset(channel,UART_DLL,baudratel); baudrateh = (UartBaud & 0xff00) >> 8; UART_rset(channel,UART_DLH,baudrateh); UART_rset(channel,UART_LCR,0x00); /* Set word length. */ uartdata = UartWordLen + UartStopBits + UartParity; UART_rset(channel,UART_LCR,uartdata); /* Set FIFO parameters. */ UART_rset(channel,UART_FCR,FIFO_rreset); UART_rset(channel,UART_FCR,UartFifoControl); UART_rset(channel,UART_MCR,UartLoopway); } /************************************************************ Function: UART_receive_single Description: UART接收函数 Calls: No Called By: Input: channel: 通道号,UART A or UART B Output: No Return: 0: 接收结束 1: 数据没有准备好 0xFFFF: 接收错误 2: 中断超时 Others: No ************************************************************/ Uint16 UART_receive_single(Uint32 channel) { Uint16 revdata; revdata = UART_rget(channel,UART_RHR); return(revdata&0xFF); } /************************************************************ Function: UART_send_single Description: UART单个数据发送函数 Calls: No Called By: Input: channel: 通道号,UART A or UART B send_data:待发送数据 Output: No Return: No Others: No ************************************************************/ void UART_send_single(Uint32 channel,Uint8 send_data) { Uint16 lsrdata; do { lsrdata = UART_rget(channel,UART_LSR); } while( (lsrdata & 0x40) != 0x40 ); UART_rset(channel, UART_THR, send_data); } /************************************************************ Function: UART_send Description: UART发送函数 Calls: No Called By: Input: channel: 通道号,UART A or UART B BaudRate:UART波特率 send_data:待发送数据地址 length: 待发送数据长度 Output: No Return: No Others: No ************************************************************/ void UART_send(Uint32 channel,Uint16 BaudRate,Uint16 length,Uint8 *send_data) { Uint16 i; for( i=0; i<length; i++ ) { UART_send_single(channel, *send_data++); } } /************************************************************ Function: UART_IntSetup Description: UART中断建立 Calls: No Called By: Input: channel: 通道号,UART A or UART B UartIntn: UART中断 Output: No Return: No Others: No ************************************************************/ void UART_IntSetup(Uint32 channel, Uint8 UartIntn) { UART_rget(channel, UART_LSR); UART_rset(channel,UART_IER, UartIntn); UART_rset(channel,UART_MCR, 0x49); } /********************************************************************************/ /* End of UART.C */ /********************************************************************************/