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
  30 #include "platform.h"
  31
  32 #include "usb_lib.h"
  33 #include "usb_prop.h"
  34 #include "usb_pwr.h"
  35 #include "usb_istr.h"
  36
  37 /* Private typedef -----------------------------------------------------------*/
  38 /* Private define ------------------------------------------------------------*/
  39 /* Private macro -------------------------------------------------------------*/
  40 /* Private variables ---------------------------------------------------------*/
  41 __IO uint16_t wIstr; /* ISTR register last read value */
  42 __IO uint8_t bIntPackSOF = 0; /* SOFs received between 2 consecutive packets */
  43 __IO uint32_t esof_counter = 0; /* expected SOF counter */
  44 __IO uint32_t wCNTR = 0;
  45
  46 /* Extern variables ----------------------------------------------------------*/
  47 /* Private function prototypes -----------------------------------------------*/
  48 /* Private functions ---------------------------------------------------------*/
  49 /* function pointers to non-control endpoints service routines */
  50 void (*pEpInt_IN[7])(void) =
  51 {
  52     EP1_IN_Callback,
  53     EP2_IN_Callback,
  54     EP3_IN_Callback,
  55     EP4_IN_Callback,
  56     EP5_IN_Callback,
  57     EP6_IN_Callback,
  58     EP7_IN_Callback,
  59 };
  60
  61 void (*pEpInt_OUT[7])(void) =
  62 {
  63     EP1_OUT_Callback,
  64     EP2_OUT_Callback,
  65     EP3_OUT_Callback,
  66     EP4_OUT_Callback,
  67     EP5_OUT_Callback,
  68     EP6_OUT_Callback,
  69     EP7_OUT_Callback,
  70 };
  71
  72 /*******************************************************************************
  73  * Function Name  : USB_Istr
  74  * Description    : ISTR events interrupt service routine
  75  * Input          :
  76  * Output         :
  77  * Return         :
  78  *******************************************************************************/
  79 void USB_Istr(void)
  80 {
  81     wIstr = _GetISTR();
  82
  83 #if (IMR_MSK & ISTR_SOF)
  84     if (wIstr & ISTR_SOF & wInterrupt_Mask) {
  85         _SetISTR((uint16_t)CLR_SOF);
  86         bIntPackSOF++;
  87
  88 #ifdef SOF_CALLBACK
  89         SOF_Callback();
  90 #endif
  91     }
  92 #endif
  93     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
  94
  95 #if (IMR_MSK & ISTR_CTR)
  96     if (wIstr & ISTR_CTR & wInterrupt_Mask) {
  97         /* servicing of the endpoint correct transfer interrupt */
  98         /* clear of the CTR flag into the sub */
  99         CTR_LP();
 100 #ifdef CTR_CALLBACK
 101         CTR_Callback();
 102 #endif
 103     }
 104 #endif
 105     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 106 #if (IMR_MSK & ISTR_RESET)
 107     if (wIstr & ISTR_RESET & wInterrupt_Mask) {
 108         _SetISTR((uint16_t)CLR_RESET);
 109         Device_Property.Reset();
 110 #ifdef RESET_CALLBACK
 111         RESET_Callback();
 112 #endif
 113     }
 114 #endif
 115     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 116 #if (IMR_MSK & ISTR_DOVR)
 117     if (wIstr & ISTR_DOVR & wInterrupt_Mask)
 118     {
 119         _SetISTR((uint16_t)CLR_DOVR);
 120 #ifdef DOVR_CALLBACK
 121         DOVR_Callback();
 122 #endif
 123     }
 124 #endif
 125     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 126 #if (IMR_MSK & ISTR_ERR)
 127     if (wIstr & ISTR_ERR & wInterrupt_Mask) {
 128         _SetISTR((uint16_t)CLR_ERR);
 129 #ifdef ERR_CALLBACK
 130         ERR_Callback();
 131 #endif
 132     }
 133 #endif
 134     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 135 #if (IMR_MSK & ISTR_WKUP)
 136     if (wIstr & ISTR_WKUP & wInterrupt_Mask) {
 137         _SetISTR((uint16_t)CLR_WKUP);
 138         Resume(RESUME_EXTERNAL);
 139 #ifdef WKUP_CALLBACK
 140         WKUP_Callback();
 141 #endif
 142     }
 143 #endif
 144     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 145 #if (IMR_MSK & ISTR_SUSP)
 146     if (wIstr & ISTR_SUSP & wInterrupt_Mask)
 147     {
 148
 149         /* check if SUSPEND is possible */
 150         if (fSuspendEnabled)
 151         {
 152             Suspend();
 153         }
 154         else
 155         {
 156             /* if not possible then resume after xx ms */
 157             Resume(RESUME_LATER);
 158         }
 159         /* clear of the ISTR bit must be done after setting of CNTR_FSUSP */
 160         _SetISTR((uint16_t)CLR_SUSP);
 161 #ifdef SUSP_CALLBACK
 162         SUSP_Callback();
 163 #endif
 164     }
 165 #endif
 166     /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 167
 168 #if (IMR_MSK & ISTR_ESOF)
 169     if (wIstr & ISTR_ESOF & wInterrupt_Mask)
 170     {
 171         /* clear ESOF flag in ISTR */
 172         _SetISTR((uint16_t)CLR_ESOF);
 173
 174         if ((_GetFNR()&FNR_RXDP)!=0)
 175         {
 176             /* increment ESOF counter */
 177             esof_counter ++;
 178
 179             /* test if we enter in ESOF more than 3 times with FSUSP =0 and RXDP =1=>> possible missing SUSP flag*/
 180             if ((esof_counter >3)&&((_GetCNTR()&CNTR_FSUSP)==0))
 181             {
 182                 /* this a sequence to apply a force RESET*/
 183
 184                 /*Store CNTR value */
 185                 wCNTR = _GetCNTR();
 186
 187                 /*Store endpoints registers status */
 188                 for (i=0;i<8;i++) EP[i] = _GetENDPOINT(i);
 189
 190                 /*apply FRES */
 191                 wCNTR|=CNTR_FRES;
 192                 _SetCNTR(wCNTR);
 193
 194                 /*clear FRES*/
 195                 wCNTR&=~CNTR_FRES;
 196                 _SetCNTR(wCNTR);
 197
 198                 /*poll for RESET flag in ISTR*/
 199                 while ((_GetISTR()&ISTR_RESET) == 0);
 200                 /* clear RESET flag in ISTR */
 201                 _SetISTR((uint16_t)CLR_RESET);
 202
 203                 /*restore Enpoints*/
 204                 for (i=0;i<8;i++)
 205                 _SetENDPOINT(i, EP[i]);
 206
 207                 esof_counter = 0;
 208             }
 209         }
 210         else
 211         {
 212             esof_counter = 0;
 213         }
 214
 215         /* resume handling timing is made with ESOFs */
 216         Resume(RESUME_ESOF); /* request without change of the machine state */
 217
 218 #ifdef ESOF_CALLBACK
 219         ESOF_Callback();
 220 #endif
 221     }
 222 #endif
 223 } /* USB_Istr */
 224
 225 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/