src/main/vcp/usb_istr.c

   1 /**
   2  ******************************************************************************
   3  * @file    usb_istr.c
   4  * @author  MCD Application Team
   5  * @version V4.0.0
   6  * @date    21-January-2013
   7  * @brief   ISTR events interrupt service routines
   8  ******************************************************************************
   9  * @attention
  10  *
  11  * <h2><center>&copy; COPYRIGHT 2013 STMicroelectronics</center></h2>
  12  *
  13  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  14  * You may not use this file except in compliance with the License.
  15  * You may obtain a copy of the License at:
  16  *
  17  *        http://www.st.com/software_license_agreement_liberty_v2
  18  *
  19  * Unless required by applicable law or agreed to in writing, software
  20  * distributed under the License is distributed on an "AS IS" BASIS,
  21  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  22  * See the License for the specific language governing permissions and
  23  * limitations under the License.
  24  *
  25  ******************************************************************************
  26  */
  27
  28 /* Includes ------------------------------------------------------------------*/
  29 #include "usb_lib.h"
  30 #include "usb_prop.h"
  31 #include "usb_pwr.h"
  32 #include "usb_istr.h"
  33
  34 /* Private typedef -----------------------------------------------------------*/
  35 /* Private define ------------------------------------------------------------*/
  36 /* Private macro -------------------------------------------------------------*/
  37 /* Private variables ---------------------------------------------------------*/
  38 __IO uint16_t wIstr; /* ISTR register last read value */
  39 __IO uint8_t bIntPackSOF = 0; /* SOFs received between 2 consecutive packets */
  40 __IO uint32_t esof_counter = 0; /* expected SOF counter */
  41 __IO uint32_t wCNTR = 0;
  42
  43 /* Extern variables ----------------------------------------------------------*/
  44 /* Private function prototypes -----------------------------------------------*/
  45 /* Private functions ---------------------------------------------------------*/
  46 /* function pointers to non-control endpoints service routines */
  47 void (*pEpInt_IN[7])(void) =
  48 {
  49     EP1_IN_Callback,
  50     EP2_IN_Callback,
  51     EP3_IN_Callback,
  52     EP4_IN_Callback,
  53     EP5_IN_Callback,
  54     EP6_IN_Callback,
  55     EP7_IN_Callback,
  56 };
  57
  58 void (*pEpInt_OUT[7])(void) =
  59 {
  60     EP1_OUT_Callback,
  61     EP2_OUT_Callback,
  62     EP3_OUT_Callback,
  63     EP4_OUT_Callback,
  64     EP5_OUT_Callback,
  65     EP6_OUT_Callback,
  66     EP7_OUT_Callback,
  67 };
  68
  69 /*******************************************************************************
  70  * Function Name  : USB_Istr
  71  * Description    : ISTR events interrupt service routine
  72  * Input          :
  73  * Output         :
  74  * Return         :
  75  *******************************************************************************/
  76 void USB_Istr(void)
  77 {
  78     wIstr = _GetISTR();
  79
  80 #if (IMR_MSK & ISTR_SOF)
  81     if (wIstr & ISTR_SOF & wInterrupt_Mask) {
  82         _SetISTR((uint16_t)CLR_SOF);
  83         bIntPackSOF++;
  84
  85 #ifdef SOF_CALLBACK
  86         SOF_Callback();
  87 #endif
  88     }
  89 #endif
  90     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
  91
  92 #if (IMR_MSK & ISTR_CTR)
  93     if (wIstr & ISTR_CTR & wInterrupt_Mask) {
  94         /* servicing of the endpoint correct transfer interrupt */
  95         /* clear of the CTR flag into the sub */
  96         CTR_LP();
  97 #ifdef CTR_CALLBACK
  98         CTR_Callback();
  99 #endif
 100     }
 101 #endif
 102     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 103 #if (IMR_MSK & ISTR_RESET)
 104     if (wIstr & ISTR_RESET & wInterrupt_Mask) {
 105         _SetISTR((uint16_t)CLR_RESET);
 106         Device_Property.Reset();
 107 #ifdef RESET_CALLBACK
 108         RESET_Callback();
 109 #endif
 110     }
 111 #endif
 112     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 113 #if (IMR_MSK & ISTR_DOVR)
 114     if (wIstr & ISTR_DOVR & wInterrupt_Mask)
 115     {
 116         _SetISTR((uint16_t)CLR_DOVR);
 117 #ifdef DOVR_CALLBACK
 118         DOVR_Callback();
 119 #endif
 120     }
 121 #endif
 122     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 123 #if (IMR_MSK & ISTR_ERR)
 124     if (wIstr & ISTR_ERR & wInterrupt_Mask) {
 125         _SetISTR((uint16_t)CLR_ERR);
 126 #ifdef ERR_CALLBACK
 127         ERR_Callback();
 128 #endif
 129     }
 130 #endif
 131     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 132 #if (IMR_MSK & ISTR_WKUP)
 133     if (wIstr & ISTR_WKUP & wInterrupt_Mask) {
 134         _SetISTR((uint16_t)CLR_WKUP);
 135         Resume(RESUME_EXTERNAL);
 136 #ifdef WKUP_CALLBACK
 137         WKUP_Callback();
 138 #endif
 139     }
 140 #endif
 141     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 142 #if (IMR_MSK & ISTR_SUSP)
 143     if (wIstr & ISTR_SUSP & wInterrupt_Mask)
 144     {
 145
 146         /* check if SUSPEND is possible */
 147         if (fSuspendEnabled)
 148         {
 149             Suspend();
 150         }
 151         else
 152         {
 153             /* if not possible then resume after xx ms */
 154             Resume(RESUME_LATER);
 155         }
 156         /* clear of the ISTR bit must be done after setting of CNTR_FSUSP */
 157         _SetISTR((uint16_t)CLR_SUSP);
 158 #ifdef SUSP_CALLBACK
 159         SUSP_Callback();
 160 #endif
 161     }
 162 #endif
 163     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 164
 165 #if (IMR_MSK & ISTR_ESOF)
 166     if (wIstr & ISTR_ESOF & wInterrupt_Mask)
 167     {
 168         /* clear ESOF flag in ISTR */
 169         _SetISTR((uint16_t)CLR_ESOF);
 170
 171         if ((_GetFNR()&FNR_RXDP)!=0)
 172         {
 173             /* increment ESOF counter */
 174             esof_counter ++;
 175
 176             /* test if we enter in ESOF more than 3 times with FSUSP =0 and RXDP =1=>> possible missing SUSP flag*/
 177             if ((esof_counter >3)&&((_GetCNTR()&CNTR_FSUSP)==0))
 178             {
 179                 /* this a sequence to apply a force RESET*/
 180
 181                 /*Store CNTR value */
 182                 wCNTR = _GetCNTR();
 183
 184                 /*Store endpoints registers status */
 185                 for (i=0;i<8;i++) EP[i] = _GetENDPOINT(i);
 186
 187                 /*apply FRES */
 188                 wCNTR|=CNTR_FRES;
 189                 _SetCNTR(wCNTR);
 190
 191                 /*clear FRES*/
 192                 wCNTR&=~CNTR_FRES;
 193                 _SetCNTR(wCNTR);
 194
 195                 /*poll for RESET flag in ISTR*/
 196                 while((_GetISTR()&ISTR_RESET) == 0);
 197                 /* clear RESET flag in ISTR */
 198                 _SetISTR((uint16_t)CLR_RESET);
 199
 200                 /*restore Enpoints*/
 201                 for (i=0;i<8;i++)
 202                 _SetENDPOINT(i, EP[i]);
 203
 204                 esof_counter = 0;
 205             }
 206         }
 207         else
 208         {
 209             esof_counter = 0;
 210         }
 211
 212         /* resume handling timing is made with ESOFs */
 213         Resume(RESUME_ESOF); /* request without change of the machine state */
 214
 215 #ifdef ESOF_CALLBACK
 216         ESOF_Callback();
 217 #endif
 218     }
 219 #endif
 220 } /* USB_Istr */
 221
 222 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/