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/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name : usb_int.c
* Author : MCD Application Team
* Version : V2.2.1
* Date : 09/22/2008
* Description : Endpoint CTR (Low and High) interrupt's service routines
********************************************************************************
* THE PRESENT FIRMWARE 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 FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "usb_lib.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
u16 SaveRState;
u16 SaveTState;
/* Extern variables ----------------------------------------------------------*/
extern void (*pEpInt_IN[7])(void); /* Handles IN interrupts */
extern void (*pEpInt_OUT[7])(void); /* Handles OUT interrupts */
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : CTR_LP.
* Description : Low priority Endpoint Correct Transfer interrupt's service
* routine.
* Input : None.
* Output : None.
* Return : None.
*******************************************************************************/
void CTR_LP(void)
{
u32 wEPVal = 0;
/* stay in loop while pending ints */
while (((wIstr = _GetISTR()) & ISTR_CTR) != 0)
{
_SetISTR((u16)CLR_CTR); /* clear CTR flag */
/* extract highest priority endpoint number */
EPindex = (u8)(wIstr & ISTR_EP_ID);
if (EPindex == 0)
{
/* Decode and service control endpoint interrupt */
/* calling related service routine */
/* (Setup0_Process, In0_Process, Out0_Process) */
/* 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);
/* DIR bit = origin of the interrupt */
if ((wIstr & ISTR_DIR) == 0)
{
/* DIR = 0 */
/* DIR = 0 => IN int */
/* DIR = 0 implies that (EP_CTR_TX = 1) always */
_ClearEP_CTR_TX(ENDP0);
In0_Process();
/* before terminate set Tx & Rx status */
_SetEPRxStatus(ENDP0, SaveRState);
_SetEPTxStatus(ENDP0, SaveTState);
return;
}
else
{
/* DIR = 1 */
/* 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();
/* before terminate set Tx & Rx status */
_SetEPRxStatus(ENDP0, SaveRState);
_SetEPTxStatus(ENDP0, SaveTState);
return;
}
else if ((wEPVal &EP_SETUP) != 0)
{
_ClearEP_CTR_RX(ENDP0); /* SETUP bit kept frozen while CTR_RX = 1 */
Setup0_Process();
/* before terminate set Tx & Rx status */
_SetEPRxStatus(ENDP0, SaveRState);
_SetEPTxStatus(ENDP0, SaveTState);
return;
}
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);
return;
}
}
}/* if(EPindex == 0) */
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);
/* call OUT service function */
(*pEpInt_OUT[EPindex-1])();
} /* if((wEPVal & EP_CTR_RX) */
if ((wEPVal & EP_CTR_TX) != 0)
{
/* clear int flag */
_ClearEP_CTR_TX(EPindex);
/* call IN service function */
(*pEpInt_IN[EPindex-1])();
} /* if((wEPVal & EP_CTR_TX) != 0) */
}/* if(EPindex == 0) else */
}/* while(...) */
}
/*******************************************************************************
* Function Name : CTR_HP.
* Description : High Priority Endpoint Correct Transfer interrupt's service
* routine.
* Input : None.
* Output : None.
* Return : None.
*******************************************************************************/
void CTR_HP(void)
{
u32 wEPVal = 0;
while (((wIstr = _GetISTR()) & ISTR_CTR) != 0)
{
_SetISTR((u16)CLR_CTR); /* clear CTR flag */
/* extract highest priority endpoint number */
EPindex = (u8)(wIstr & ISTR_EP_ID);
/* process related endpoint register */
wEPVal = _GetENDPOINT(EPindex);
if ((wEPVal & EP_CTR_RX) != 0)
{
/* clear int flag */
_ClearEP_CTR_RX(EPindex);
/* call OUT service function */
(*pEpInt_OUT[EPindex-1])();
} /* if((wEPVal & EP_CTR_RX) */
else if ((wEPVal & EP_CTR_TX) != 0)
{
/* clear int flag */
_ClearEP_CTR_TX(EPindex);
/* call IN service function */
(*pEpInt_IN[EPindex-1])();
} /* if((wEPVal & EP_CTR_TX) != 0) */
}/* while(...) */
}
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
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