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//*----------------------------------------------------------------------------
//* 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 14/Dec/04 JPP : Creation
//* 1.1 29/Aug/05 JPP : Update AIC definion
//*----------------------------------------------------------------------------
// Include Standard LIB files
#include "Board.h"
#include "cdc_enumerate.h"
#define USART_INTERRUPT_LEVEL 1
AT91PS_USART COM0;
#define USART_BAUD_RATE 115200
extern struct _AT91S_CDC pCDC;
static char buff_rx[100];
static char buff_rx1[100];
unsigned int first =0;
//*------------------------- Internal Function --------------------------------
//*----------------------------------------------------------------------------
//* Function Name : Trace_Toggel_LED
//* Object : Toggel a LED
//*----------------------------------------------------------------------------
void Trace_Toggel_LED (unsigned int Led)
{
if ( (AT91F_PIO_GetInput(AT91C_BASE_PIOA) & Led ) == Led )
{
AT91F_PIO_ClearOutput( AT91C_BASE_PIOA, Led );
}
else
{
AT91F_PIO_SetOutput( AT91C_BASE_PIOA, Led );
}
}
//*------------------------- Interrupt Function -------------------------------
//*----------------------------------------------------------------------------
//* Function Name : Usart_c_irq_handler
//* Object : C handler interrupt function called by the interrupts
//* assembling routine
//*----------------------------------------------------------------------------
void Usart_c_irq_handler(void)
{
AT91PS_USART USART_pt = COM0;
unsigned int status;
//* get Usart status register and active interrupt
status = USART_pt->US_CSR ;
status &= USART_pt->US_IMR;
if ( status & AT91C_US_RXBUFF){
//* Toggel LED
Trace_Toggel_LED( LED3) ;
//* transfert the char to DBGU
if ( first == 0){
COM0->US_RPR = (unsigned int) buff_rx1;
COM0->US_RCR = 100;
pCDC.Write(&pCDC, buff_rx,100);
first =1;
}else{
COM0->US_RPR = (unsigned int) buff_rx;
COM0->US_RCR = 100;
pCDC.Write(&pCDC, buff_rx1,100);
first=0;
}
}
//* Check error
if ( status & AT91C_US_TIMEOUT){
Trace_Toggel_LED( LED4) ;
status = 100 - COM0->US_RCR;
if (status !=0){
if ( first == 0){
COM0->US_RPR = (unsigned int) buff_rx1;
COM0->US_RCR = 100;
pCDC.Write(&pCDC, buff_rx,status);
first =1;
}else{
COM0->US_RPR = (unsigned int) buff_rx;
COM0->US_RCR = 100;
pCDC.Write(&pCDC, buff_rx1,status);
first=0;
}
COM0->US_CR = AT91C_US_STTTO;
}
}
//* Reset the satus bit for error
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_Put( char *buffer) // \arg pointer to a string ending by \0
{
while(*buffer != '\0') {
while (!AT91F_US_TxReady(COM0));
AT91F_US_PutChar(COM0, *buffer++);
}
}
//*----------------------------------------------------------------------------
//* Function Name : Usart_init
//* Object : USART initialization
//* Input Parameters : none
//* Output Parameters : TRUE
//*----------------------------------------------------------------------------
void Usart_init ( void )
//* Begin
{
// Led init
// First, enable the clock of the PIOB
AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1 << AT91C_ID_PIOA ) ;
//* to be outputs. No need to set these pins to be driven by the PIO because it is GPIO pins only.
AT91F_PIO_CfgOutput( AT91C_BASE_PIOA, LED_MASK ) ;
//* Clear the LED's.
AT91F_PIO_SetOutput( AT91C_BASE_PIOA, LED_MASK ) ;
//* Set led 1e LED's.
AT91F_PIO_ClearOutput( AT91C_BASE_PIOA, LED1 ) ;
COM0= AT91C_BASE_US0;
//* Define RXD and TXD as peripheral
// Configure PIO controllers to periph mode
AT91F_PIO_CfgPeriph(
AT91C_BASE_PIOA, // PIO controller base address
((unsigned int) AT91C_PA5_RXD0 ) |
((unsigned int) AT91C_PA6_TXD0 ) , // Peripheral A
0 ); // Peripheral B
//* First, enable the clock of the PIOB
AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1<<AT91C_ID_US0 ) ;
//* Usart Configure
AT91F_US_Configure (COM0, MCK,AT91C_US_ASYNC_MODE,USART_BAUD_RATE , 0);
//* Enable usart
COM0->US_CR = AT91C_US_RXEN | AT91C_US_TXEN;
//* open Usart interrupt
AT91F_AIC_ConfigureIt (AT91C_BASE_AIC, AT91C_ID_US0, USART_INTERRUPT_LEVEL,
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, Usart_c_irq_handler);
AT91F_AIC_EnableIt (AT91C_BASE_AIC, AT91C_ID_US0);
// Set the PDC
AT91F_PDC_Open (AT91C_BASE_PDC_US0);
COM0->US_RPR = (unsigned int) buff_rx;
COM0->US_RCR = 100;
first = 0;
COM0->US_RTOR = 10;
//* Enable USART IT error and AT91C_US_ENDRX
AT91F_US_EnableIt(COM0,AT91C_US_RXBUFF | AT91C_US_TIMEOUT );
//* End
}
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