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/******************** (C) COPYRIGHT 2006 STMicroelectronics ********************
* File Name : usb_int.c
* Author : MCD Application Team
* Date First Issued : 05/18/2006 : Version 1.0
* Description : Endpoint CTR interrupt service routine
********************************************************************************
* History:
* 05/24/2006 : Version 1.1
* 05/18/2006 : Version 1.0
********************************************************************************
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH
* CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS
* A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT
* OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT
* OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION
* CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
#include "USB_lib.h"
extern void (*pEpInt[9])(void);
void CTR_ISR()
{
WORD wEPVal;
/* stay in loop while pending ints */
while(((wIstr = _GetISTR()) & ISTR_CTR)!= 0)
{
_SetISTR((WORD)CLR_CTR); /* clear CTR flag */
/* extract highest priority endpoint number */
EPindex = (BYTE)(wIstr & ISTR_EP_ID);
if(EPindex == 0) /* Decode and service control endpoint interrupt */
{
/* save RX & TX status */
/* and set both to NAK */
SaveRState = _GetEPRxStatus(ENDP0);
SaveTState = _GetEPTxStatus(ENDP0);
_SetEPRxStatus(ENDP0, EP_RX_NAK);
_SetEPTxStatus(ENDP0, EP_TX_NAK);
if((wIstr & ISTR_DIR) == 0)
{
/* DIR = 0 => IN int */
_ClearEP_CTR_TX(ENDP0);
In0_Process();
/* check if SETUP arrived during IN processing */
wEPVal = _GetENDPOINT(ENDP0);
if((wEPVal & (EP_CTR_RX|EP_SETUP)) != 0)
{
_ClearEP_CTR_RX(ENDP0); /* SETUP bit kept frozen while CTR_RX = 1 */
Setup0_Process();
}
}
else
{
/* DIR = 1 & CTR_RX => SETUP or OUT int */
/* DIR = 1 & (CTR_TX | CTR_RX) => 2 int pending */
wEPVal = _GetENDPOINT(ENDP0);
if((wEPVal & EP_CTR_TX) != 0)
{
_ClearEP_CTR_TX(ENDP0);
In0_Process();
}
if((wEPVal &EP_SETUP) != 0)
{
_ClearEP_CTR_RX(ENDP0); /* SETUP bit kept frozen while CTR_RX = 1 */
Setup0_Process();
}
else if((wEPVal & EP_CTR_RX) != 0)
{
_ClearEP_CTR_RX(ENDP0);
Out0_Process();
}
}
/* before terminate set Tx & Rx status */
_SetEPRxStatus(ENDP0, SaveRState);
_SetEPTxStatus(ENDP0, SaveTState);
}
else /* Decode and service non control endpoints interrupt */
{
/* process related endpoint register */
wEPVal = _GetENDPOINT(EPindex);
if((wEPVal & EP_CTR_RX) != 0)
{
/* clear int flag */
_ClearEP_CTR_RX(EPindex);
}
if((wEPVal & EP_CTR_TX) != 0)
{
/* clear int flag */
_ClearEP_CTR_TX(EPindex);
}
/* call service function */
(*pEpInt[EPindex-1])();
}
}
} /* CTR_ISR */
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