int_uart.rar_int 机制

#include<s3c2440.h> #define FCLK 202800000 #define HCLK (202800000/2) #define PCLK (202800000/4) #define UART0 0x0 // UART symbol #define UART1 0x1 #define UART2 0xBB #define _ISR_STARTADDRESS 0x33ffff00 #define pISR_UART0 (*(unsigned *)(_ISR_STARTADDRESS+0x90)) /********************************************************************************************* * name: uart_init * func: initialize uart channel * para: nMainClk -- input, the MCLK value of current system * nBaud -- input, baud rate value for UARTx * nChannel -- input, UART0, UART1 or UART2 * ret: none * modify: * comment: *********************************************************************************************/ void uart_init(int nMainClk, int nBaud, int nChannel) { // int i; if(nMainClk == 0) nMainClk = PCLK; switch (nChannel) { case UART0: UFCON0 = 0x0; //UART channel 0 FIFO control register, FIFO disable UMCON0 = 0x0; //UART chaneel 0 MODEM control register, AFC disable ULCON0 = 0x3; //Line control register : Normal,No parity,1 stop,8 bits // [10] [9] [8] [7] [6] [5] [4] [3:2] [1:0] // Clock Sel, Tx Int, Rx Int, Rx Time Out, Rx err, Loop-back, Send break, Transmit Mode, Receive Mode // 0 1 0, 0 1 0 0, 01 01 // PCLK Level Pulse Disable Generate Normal Normal Interrupt or Polling UCON0 = 0x345; // Control register // rUBRDIV0=( (int)(nMainClk/16./nBaud) -1 ); // Baud rate divisior register 0 UBRDIV0=( (int)(nMainClk/16./nBaud+0.5) -1 ); // Baud rate divisior register 0 break; case UART1: UFCON1 = 0x0; //UART channel 1 FIFO control register, FIFO disable UMCON1 = 0x0; //UART chaneel 1 MODEM control register, AFC disable ULCON1 = 0x3; UCON1 = 0x245; UBRDIV1=( (int)(nMainClk/16/nBaud) -1 ); break; default: break; } // for(i=0;i<100;i++); // delay(400); } void uart_sendbyte(int nData) { UTXH0 = nData; while(!(UTRSTAT0 & 0x2)); } void __irq uart_int(void) { int temp ; temp = URXH0; UTXH0= temp; SUBSRCPND |= 1; ClearPending(1<<28); } /********************************************************************************************* * name: uart_sendstring * func: Send string to uart channel * para: pString -- input, string * ret: none * modify: * comment: *********************************************************************************************/ void uart_sendstring(char *pString) { while(*pString != '\0') uart_sendbyte(*pString++); } void uart_printf(char *fmt) { uart_sendstring(fmt); } int main() { WTCON = 0; CLKDIVN = (1<<1) | 1; //设置 1:2:4 MPLLCON = (0xa1<<12) | (0x3<<4) | 0x1; // Fin=12MHz FCLK=202.8MHz //=== PORT H GROUP //Ports : GPH10 GPH9 GPH8 GPH7 GPH6 GPH5 GPH4 GPH3 GPH2 GPH1 GPH0 //Signal : GPH10 CLKOUT0 SD_WP CTS1 RTS1 RXD1 TXD1 RXD0 TXD0 nRTS0 nCTS0 //Setting: Output CLKOUT0 GPH8 nCTS1 nRTS1 RXD1 TXD1 RXD0 TXD0 nRTS0 nCTS0 //Binary : 10, 10 10, 11 11, 10 10, 10 10, 10 10 GPHCON = 0x2afaaa; GPHUP = 0x7ff; // The pull up function is disabled GPH[10:0] pISR_UART0 = (unsigned int )uart_int; uart_init(PCLK, 115200, UART0); uart_sendbyte('\n'); uart_printf ("boot success..."); uart_sendbyte('\n'); uart_printf("please enter a char"); uart_sendbyte('\n'); uart_sendbyte('>'); uart_sendbyte('$'); SRCPND = SRCPND; // clear all interrupt INTPND = INTPND; // clear all interrupt; INTSUBMSK = INTSUBMSK & ~(1<<0); INTMSK = INTMSK & ~(1<<28); while(1); }