c_isr.c

以at91的9200举例讲解嵌入式系统中如何实现完美的SUB功能

//*----------------------------------------------------------------------------
//*         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           : c_isr.c
//* Object              : Interupt service routine called by assembler function in asm_isr.s
//* Creation            : ODi   06/26/2002
//*
//*----------------------------------------------------------------------------
#include "main.h"

//*----------------------------------------------------------------------------
//* \fn    AT91F_UDP_Handler
//* \brief This function is invoked by AT91F_ASM_UDP_Handler
//* This function is for demonstration purpose only
//*----------------------------------------------------------------------------
void AT91F_UDP_Handler(void)
{
	unsigned int interrupt = (AT91C_BASE_UDP->UDP_ISR  & AT91C_BASE_UDP->UDP_IMR);

	while (interrupt ) {
		if (interrupt & AT91C_UDP_ENDBUSRES) {
			AT91C_BASE_UDP->UDP_ICR = AT91C_UDP_ENDBUSRES;
			AT91C_BASE_UDP->UDP_ICR = AT91C_UDP_ENDBUSRES;
			// reset all endpoints
			AT91F_UDP_ResetEp(AT91C_BASE_UDP, (AT91C_UDP_EPINT1 | AT91C_UDP_EPINT2));
			AT91F_UDP_ResetEp(AT91C_BASE_UDP, 0);
			AT91F_UDP_EpSet(AT91C_BASE_UDP, 0, (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL)); // Endpoint 1 is a ctl endpoint
			AT91F_UDP_EnableIt(AT91C_BASE_UDP, AT91C_UDP_EPINT0);
			AT91F_UDP_DisableIt(AT91C_BASE_UDP, AT91C_UDP_EPINT1 | AT91C_UDP_EPINT2 | AT91C_UDP_EPINT3);
		}
		else if (interrupt & AT91C_UDP_EPINT0) {
			usbEp0.Handler(&usbEp0);
			AT91C_BASE_UDP->UDP_ICR = AT91C_UDP_EPINT0;
		}

		else if (interrupt & AT91C_UDP_EPINT2) {
			usbEpIn.Handler(&usbEpIn);
			AT91C_BASE_UDP->UDP_ICR = AT91C_UDP_EPINT2;
		}

		else if (interrupt & AT91C_UDP_EPINT1) {
			usbEpOut.Handler(&usbEpOut);
			AT91C_BASE_UDP->UDP_ICR = AT91C_UDP_EPINT1;
		}

		else if (interrupt & AT91C_UDP_EPINT3) {
			usbEpInt.Handler(&usbEpInt);
			AT91C_BASE_UDP->UDP_ICR = AT91C_UDP_EPINT3;
		}

		else {
			AT91C_BASE_UDP->UDP_ICR = interrupt;
		}
		interrupt = (AT91C_BASE_UDP->UDP_ISR  & AT91C_BASE_UDP->UDP_IMR);
	}
}