usbd_cdc_interface.c 11.8 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
/**
  ******************************************************************************
  * @file    USB_Device/CDC_Standalone/Src/usbd_cdc_interface.c
  * @author  MCD Application Team
  * @version V1.0.1
  * @date    26-February-2014
  * @brief   Source file for USBD CDC interface
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include <stdbool.h>
#include "stm32f4xx_hal.h"
31
#include "usbd_cdc_msc.h"
32
33
34
35
#include "usbd_cdc_interface.h"
#include "pendsv.h"
#include "usb.h"

36
37
38
39
40
41
42
43
44
45
46
// CDC control commands
#define CDC_SEND_ENCAPSULATED_COMMAND               0x00
#define CDC_GET_ENCAPSULATED_RESPONSE               0x01
#define CDC_SET_COMM_FEATURE                        0x02
#define CDC_GET_COMM_FEATURE                        0x03
#define CDC_CLEAR_COMM_FEATURE                      0x04
#define CDC_SET_LINE_CODING                         0x20
#define CDC_GET_LINE_CODING                         0x21
#define CDC_SET_CONTROL_LINE_STATE                  0x22
#define CDC_SEND_BREAK                              0x23

47
48
49
50
51
52
53
54
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define APP_RX_DATA_SIZE  1024 // I think this must be at least CDC_DATA_FS_OUT_PACKET_SIZE (was 2048)
#define APP_TX_DATA_SIZE  1024 // I think this can be any value (was 2048)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/

55
56
static uint8_t dev_is_connected = 0; // indicates if we are connected

57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
static uint8_t UserRxBuffer[APP_RX_DATA_SIZE]; // received data from USB OUT endpoint is stored in this buffer
static uint16_t UserRxBufCur = 0; // points to next available character in UserRxBuffer
static uint16_t UserRxBufLen = 0; // counts number of valid characters in UserRxBuffer

static uint8_t UserTxBuffer[APP_TX_DATA_SIZE]; // data for USB IN endpoind is stored in this buffer
static uint16_t UserTxBufPtrIn = 0; // increment this pointer modulo APP_TX_DATA_SIZE when new data is available
static uint16_t UserTxBufPtrOut = 0; // increment this pointer modulo APP_TX_DATA_SIZE when data is drained

static int user_interrupt_char = VCP_CHAR_NONE;
static void *user_interrupt_data = NULL;

/* USB handler declaration */
extern USBD_HandleTypeDef hUSBDDevice;

/* Private function prototypes -----------------------------------------------*/
static int8_t CDC_Itf_Init     (void);
static int8_t CDC_Itf_DeInit   (void);
static int8_t CDC_Itf_Control  (uint8_t cmd, uint8_t* pbuf, uint16_t length);
static int8_t CDC_Itf_Receive  (uint8_t* pbuf, uint32_t *Len);

const USBD_CDC_ItfTypeDef USBD_CDC_fops = {
    CDC_Itf_Init,
    CDC_Itf_DeInit,
    CDC_Itf_Control,
    CDC_Itf_Receive
};

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  CDC_Itf_Init
  *         Initializes the CDC media low layer
  * @param  None
  * @retval Result of the opeartion: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_Itf_Init(void)
{
#if 0
  /*##-1- Configure the UART peripheral ######################################*/
  /* Put the USART peripheral in the Asynchronous mode (UART Mode) */
  /* USART configured as follow:
      - Word Length = 8 Bits
      - Stop Bit    = One Stop bit
      - Parity      = No parity
      - BaudRate    = 115200 baud
      - Hardware flow control disabled (RTS and CTS signals) */
  UartHandle.Instance        = USARTx;
  UartHandle.Init.BaudRate   = 115200;
  UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
  UartHandle.Init.StopBits   = UART_STOPBITS_1;
  UartHandle.Init.Parity     = UART_PARITY_NONE;
  UartHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
  UartHandle.Init.Mode       = UART_MODE_TX_RX;
  
  if(HAL_UART_Init(&UartHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }
  
  /*##-2- Put UART peripheral in IT reception process ########################*/
  /* Any data received will be stored in "UserTxBuffer" buffer  */
  if(HAL_UART_Receive_IT(&UartHandle, (uint8_t *)UserTxBuffer, 1) != HAL_OK)
  {
    /* Transfer error in reception process */
    Error_Handler();
  }
  
  /*##-3- Configure the TIM Base generation  #################################*/
126
  now done in HAL_MspInit
127
  TIM_Config();
128
#endif
129
  
130
131
132
    /*##-4- Start the TIM Base generation in interrupt mode ####################*/
    /* Start Channel1 */
    __HAL_TIM_ENABLE_IT(&TIM3_Handle, TIM_IT_UPDATE);
133
  
134
135
136
    /*##-5- Set Application Buffers ############################################*/
    USBD_CDC_SetTxBuffer(&hUSBDDevice, UserTxBuffer, 0);
    USBD_CDC_SetRxBuffer(&hUSBDDevice, UserRxBuffer);
137
138
139
140
141
142
143

    UserRxBufCur = 0;
    UserRxBufLen = 0;
  
    user_interrupt_char = VCP_CHAR_NONE;
    user_interrupt_data = NULL;

144
    return (USBD_OK);
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
}

/**
  * @brief  CDC_Itf_DeInit
  *         DeInitializes the CDC media low layer
  * @param  None
  * @retval Result of the opeartion: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_Itf_DeInit(void)
{
#if 0
  /* DeInitialize the UART peripheral */
  if(HAL_UART_DeInit(&UartHandle) != HAL_OK)
  {
    /* Initialization Error */
  }
#endif
  return (USBD_OK);
}

/**
  * @brief  CDC_Itf_Control
  *         Manage the CDC class requests
  * @param  Cmd: Command code            
  * @param  Buf: Buffer containing command data (request parameters)
  * @param  Len: Number of data to be sent (in bytes)
  * @retval Result of the opeartion: USBD_OK if all operations are OK else USBD_FAIL
  */
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
static int8_t CDC_Itf_Control(uint8_t cmd, uint8_t* pbuf, uint16_t length) {
    switch (cmd) {
        case CDC_SEND_ENCAPSULATED_COMMAND:
            /* Add your code here */
            break;

        case CDC_GET_ENCAPSULATED_RESPONSE:
            /* Add your code here */
            break;

        case CDC_SET_COMM_FEATURE:
            /* Add your code here */
            break;

        case CDC_GET_COMM_FEATURE:
            /* Add your code here */
            break;

        case CDC_CLEAR_COMM_FEATURE:
            /* Add your code here */
            break;

        case CDC_SET_LINE_CODING:
            #if 0
            LineCoding.bitrate    = (uint32_t)(pbuf[0] | (pbuf[1] << 8) |\
                                    (pbuf[2] << 16) | (pbuf[3] << 24));
            LineCoding.format     = pbuf[4];
            LineCoding.paritytype = pbuf[5];
            LineCoding.datatype   = pbuf[6];
            /* Set the new configuration */
            #endif
            break;

        case CDC_GET_LINE_CODING:
            #if 0
            pbuf[0] = (uint8_t)(LineCoding.bitrate);
            pbuf[1] = (uint8_t)(LineCoding.bitrate >> 8);
            pbuf[2] = (uint8_t)(LineCoding.bitrate >> 16);
            pbuf[3] = (uint8_t)(LineCoding.bitrate >> 24);
            pbuf[4] = LineCoding.format;
            pbuf[5] = LineCoding.paritytype;
            pbuf[6] = LineCoding.datatype;
            #endif

            /* Add your code here */
            pbuf[0] = (uint8_t)(115200);
            pbuf[1] = (uint8_t)(115200 >> 8);
            pbuf[2] = (uint8_t)(115200 >> 16);
            pbuf[3] = (uint8_t)(115200 >> 24);
            pbuf[4] = 0; // stop bits (1)
            pbuf[5] = 0; // parity (none)
            pbuf[6] = 8; // number of bits (8)
            break;

        case CDC_SET_CONTROL_LINE_STATE:
            dev_is_connected = length & 1; // wValue is passed in Len (bit of a hack)
            break;

        case CDC_SEND_BREAK:
            /* Add your code here */
            break;

        default:
            break;
    }

    return USBD_OK;
240
241
242
243
244
245
246
}

/**
  * @brief  TIM period elapsed callback
  * @param  htim: TIM handle
  * @retval None
  */
247
void USBD_CDC_HAL_TIM_PeriodElapsedCallback(void) {
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
  uint32_t buffptr;
  uint32_t buffsize;
  
  if(UserTxBufPtrOut != UserTxBufPtrIn)
  {
    if(UserTxBufPtrOut > UserTxBufPtrIn) /* rollback */
    {
      buffsize = APP_RX_DATA_SIZE - UserTxBufPtrOut;
    }
    else 
    {
      buffsize = UserTxBufPtrIn - UserTxBufPtrOut;
    }
    
    buffptr = UserTxBufPtrOut;
    
    USBD_CDC_SetTxBuffer(&hUSBDDevice, (uint8_t*)&UserTxBuffer[buffptr], buffsize);
    
    if(USBD_CDC_TransmitPacket(&hUSBDDevice) == USBD_OK)
    {
      UserTxBufPtrOut += buffsize;
      if (UserTxBufPtrOut == APP_RX_DATA_SIZE)
      {
        UserTxBufPtrOut = 0;
      }
    }
  }
}

/**
  * @brief  CDC_Itf_DataRx
  *         Data received over USB OUT endpoint is processed here.
  * @param  Buf: Buffer of data received
  * @param  Len: Number of data received (in bytes)
  * @retval Result of the opeartion: USBD_OK if all operations are OK else USBD_FAIL
  * @note   The buffer we are passed here is just UserRxBuffer, so we are
  *         free to modify it.
  */
static int8_t CDC_Itf_Receive(uint8_t* Buf, uint32_t *Len) {
#if 0
    // this sends the data over the UART using DMA
    HAL_UART_Transmit_DMA(&UartHandle, Buf, *Len);
#endif

    if (user_interrupt_char == VCP_CHAR_NONE) {
        // no special interrupt character
        UserRxBufLen = *Len;

    } else {
        // filter out sepcial interrupt character from the buffer
        bool char_found = false;
        uint8_t *dest = Buf;
        uint8_t *src = Buf;
        uint8_t *buf_top = Buf + *Len;
        for (; src < buf_top; src++) {
            if (*src == user_interrupt_char) {
                char_found = true;
            } else {
                if (char_found) {
                    *dest = *src;
                }
                dest++;
            }
        }

        // set length of remaining characters
        UserRxBufLen = dest - Buf;

        if (char_found) {
            // raise exception when interrupts are finished
            user_interrupt_char = VCP_CHAR_NONE;
            pendsv_nlr_jump(user_interrupt_data);
        }
    }

    // there are new characters at the start of the buffer, so point there
    UserRxBufCur = 0;

    if (UserRxBufLen == 0) {
        // initiate next USB packet transfer now that UserRxBuffer has been drained
        USBD_CDC_ReceivePacket(&hUSBDDevice);
    }

    return (USBD_OK);
}

334
335
336
337
int USBD_CDC_IsConnected(void) {
    return dev_is_connected;
}

338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
void USBD_CDC_SetInterrupt(int chr, void *data) {
    user_interrupt_char = chr;
    user_interrupt_data = data;
}

void USBD_CDC_Tx(const char *str, uint32_t len) {
    for (int i = 0; i < len; i++) {
        uint timeout = 200;
        while (UserTxBufPtrIn + 1 == UserTxBufPtrOut) {
            if (timeout-- == 0) {
                break;
            }
            HAL_Delay(1);
        }
        UserTxBuffer[UserTxBufPtrIn] = str[i];
        UserTxBufPtrIn = (UserTxBufPtrIn + 1) & (APP_TX_DATA_SIZE - 1);
    }
}

int USBD_CDC_RxNum(void) {
    return UserRxBufLen - UserRxBufCur;
}

int USBD_CDC_RxGet(void) {
    // wait for buffer to have at least 1 character in it
    while (USBD_CDC_RxNum() == 0) {
        __WFI();
    }

    // get next character
    int c = UserRxBuffer[UserRxBufCur++];
    if (UserRxBufCur >= UserRxBufLen) {
        // initiate next USB packet transfer now that UserRxBuffer has been drained
        USBD_CDC_ReceivePacket(&hUSBDDevice);
    }
    return c;
}