AT91SAM7SXX的USART_PDC通信

//*---------------------------------------------------------------------------- //* ATMEL Microcontroller Software Support - ROUSSET - //*---------------------------------------------------------------------------- //* The software is delivered "AS IS" without warranty or condition of any //* kind, either express, implied or statutory. This includes without //* limitation any warranty or condition with respect to merchantability or //* fitness for any particular purpose, or against the infringements of //* intellectual property rights of others. //*---------------------------------------------------------------------------- //* File Name : interrupt_Usart.c //* Object : USART Interrupt Management //* //* 1.0 03/Jun/03 JPP : Creation //* 1.1 29/Aug/05 JPP : Update AIC definion //*---------------------------------------------------------------------------- // Include Standard LIB files #include "Board.h" #include "Main.h" #define TRACE #define USART_INTERRUPT_LEVEL 7 static const char atmel_header[]= { "\n\r *** ATMEL Usart PDC ***\n\r" "Copyright (C) 2004 ATMEL Corporations Version: 1.0\n\r" }; AT91PS_USART COM0; #define USART_BAUD_RATE 115200 static char *CurrentAddress; static unsigned short BlockSize; static char BlockMode; static int RestSize; //*------------------------- Internal Function -------------------------------- //*------------------------- Interrupt Function ------------------------------- //*---------------------------------------------------------------------------- //* Function Name : Usart_c_irq_handler //* Object : C handler interrupt function called by the interrupts //* assembling routine //* Input Parameters : <RTC_pt> time rtc descriptor //* Output Parameters : increment count_timer0_interrupt //*---------------------------------------------------------------------------- void Usart_c_irq_handler(void) { AT91PS_USART USART_pt= COM0; unsigned int status; //* get Usart status register status = USART_pt->US_CSR; if (BlockMode) { //* check if interrupt is present and available if ( (status & AT91C_US_ENDTX) & (USART_pt->US_IMR & AT91C_US_ENDTX) ){ #ifdef TRACE AT91F_DBGU_Printk("TX\n\r"); #endif //* Last block has been transmitted //* ---- Send more One Block //* Set the next pointer register CurrentAddress += BlockSize; USART_pt->US_TNPR = (unsigned int) CurrentAddress; if(RestSize <= BlockSize) { //* ---- Send last tow Blocks USART_pt->US_TNCR = RestSize; RestSize = 0; AT91F_US_DisableIt(USART_pt,AT91C_US_ENDTX ); } else { //* ---- Send another Blocks USART_pt->US_TNCR = BlockSize; RestSize -= BlockSize; } } // check if interrupt is present and available if ( (status & AT91C_US_TXBUFE) & (USART_pt->US_IMR & AT91C_US_TXBUFE) ){ BlockMode = false; AT91F_US_DisableIt(USART_pt, AT91C_US_TXBUFE ); #ifdef TRACE AT91F_DBGU_Printk("End Interrupt\n\r"); #endif #ifdef TRACE sprintf((char *)message,"IT:ass 0x%X size %d\n\r",CurrentAddress,RestSize); AT91F_DBGU_Printk((char *)message); #endif } } else { if ( status & AT91C_US_ENDRX){ //* Acknowledge Interrupt AT91F_US_ReceiveFrame(USART_pt,(char *)message,10,0,0); //* Get byte and send //* Trace on DBGU AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "ENDRX\n\r",7,0,0); } // check if interrupt is present and available if ( (status & AT91C_US_ENDTX) & (USART_pt->US_IMR & AT91C_US_ENDTX) ){ //* Acknowledge Interrupt by mask for next send AT91F_US_DisableIt(USART_pt, AT91C_US_ENDTX ); //* Trace on DBGU AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "ENDTX\n\r",7,0,0); } // check if interrupt is present and available if ( (status & AT91C_US_TXBUFE) & (USART_pt->US_IMR & AT91C_US_TXBUFE) ){ //* Acknowledge Interrupt by mask for next send AT91F_US_DisableIt(USART_pt, AT91C_US_TXBUFE ); //* Trace on DBGU AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "TXBUFE\n\r",8,0,0); } if ( status & AT91C_US_OVRE) { //* clear US_RXRDY AT91F_US_GetChar(USART_pt); //* Trace on DBGU AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "O",1,0,0); } //* Check error if ( status & AT91C_US_PARE) { //* Trace on DBGU AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "P",1,0,0); } if ( status & AT91C_US_FRAME) { //* Trace on DBGU AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "F",1,0,0); } if ( status & AT91C_US_TIMEOUT){ USART_pt->US_CR = AT91C_US_STTTO; //* Trace on DBGU AT91F_US_SendFrame((AT91PS_USART) AT91C_BASE_DBGU, "T",1,0,0); } } //* Reset the satus bit USART_pt->US_CR = AT91C_US_RSTSTA; } //*-------------------------- External Function ------------------------------- //*---------------------------------------------------------------------------- //* \fn AT91F_US_Printk //* \brief This function is used to send a string through the US channel //*---------------------------------------------------------------------------- void AT91F_US_Printk( char *buffer) // \arg pointer to a string ending by \0 { while(*buffer != '\0') { while (!AT91F_US_TxReady(COM0)); AT91F_US_PutChar(COM0, *buffer++); } } //*---------------------------------------------------------------------------- //* \fn AT91F_US_Print_frame //* \brief This function is used to send a Frame through the US channel //*---------------------------------------------------------------------------- void AT91F_US_Print_frame(char *buffer, unsigned short counter) // \arg pointer to a string ending by \0 { //* Enable USART IT error and AT91C_US_ENDRX AT91F_US_SendFrame(COM0,buffer,counter,0,0); //* enable IT AT91F_US_EnableIt(COM0, AT91C_US_ENDTX ); } //*---------------------------------------------------------------------------- //* \fn AT91F_US_Print_2_frame //* \brief This function is used to send a Frame through the US channel //* (Very low level debugging) //*---------------------------------------------------------------------------- void AT91F_US_Print_2_frame(char *buffer, unsigned short counter,char *buffer2,unsigned short counter2) // \arg pointer to a string ending by \0 { //* Enable USART IT error and AT91C_US_ENDRX AT91F_US_SendFrame(COM0,buffer,counter,buffer2,counter2); //* enable IT AT91F_US_EnableIt(COM0, AT91C_US_ENDTX |AT91C_US_TXBUFE); } //*---------------------------------------------------------------------------- //* \fn AT91F_US_PDC_status //* \brief This function is used Get the transmission block status //* (Very low level debugging) //*---------------------------------------------------------------------------- unsigned int AT91F_US_PDC_status (void) { return (BlockMode); } //*---------------------------------------------------------------------------- //* \fn AT91F_US_STT0 //* \brief This function is used Generate a time out //* (Very low level debugging) //*---------------------------------------------------------------------------- void AT91F_US_STT0 (void) { // *Enable usart SSTO COM0->US_CR = AT91C_US_STTTO | AT91C_US_RETTO; AT91F_US_EnableIt(COM0,AT91C_US_TIMEOUT); } //*---------------------------------------------------------------------------- //* \fn AT91F_US_PDC //* \brief This function is used to send a block through PDC US channel //* (Very low level debugging) //*---------------------------------------------------------------------------- void AT91F_US_PDC (char *buffer, unsigned int size, unsigned short blo