| MAXREFDES82# Code Documentation V01.00 Maxim Smart Force Sensor

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usbd_cdc_interface.c
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1
28 /* Includes ------------------------------------------------------------------*/
29 #include "main.h"
30
31 /* Private typedef -----------------------------------------------------------*/
32 /* Private define ------------------------------------------------------------*/
33 #define APP_RX_DATA_SIZE 32
34 #define APP_TX_DATA_SIZE 32
35
36 extern uint8_t request;
37
38 /* Private macro -------------------------------------------------------------*/
39 /* Private variables ---------------------------------------------------------*/
40 USBD_CDC_LineCodingTypeDef LineCoding = {
41 115200, /* baud rate */
42 0x00, /* stop bits-1 */
43 0x00, /* parity - none */
44 0x08 /* nb. of bits 8 */
45 };
46
47 uint8_t UserRxBuffer[APP_RX_DATA_SIZE];/* Received Data over USB are stored in this buffer */
48 uint8_t UserTxBuffer[APP_TX_DATA_SIZE];/* Received Data over UART (CDC interface) are stored in this buffer */
49
50 uint32_t UserTxBufPtrIn = 0;/* Increment this pointer or roll it back to
51 start address when data are received over USART */
52 uint32_t UserTxBufPtrOut = 0; /* Increment this pointer or roll it back to
53 start address when data are sent over USB */
54
55 /* UART handler declaration */
56 UART_HandleTypeDef UartHandle;
57 /* TIM handler declaration */
58 TIM_HandleTypeDef TimHandle;
59 /* USB handler declaration */
60 extern USBD_HandleTypeDef USBD_Device;
61
62 /* Private function prototypes -----------------------------------------------*/
63 static int8_t CDC_Itf_Init(void);
64 static int8_t CDC_Itf_DeInit(void);
65 static int8_t CDC_Itf_Control(uint8_t cmd, uint8_t* pbuf, uint16_t length);
66 static int8_t CDC_Itf_Receive(uint8_t* pbuf, uint32_t *Len);
67 static void Error_Handler(void);
68 static void ComPort_Config(void);
69 static void TIM_Config(void);
70
71 USBD_CDC_ItfTypeDef USBD_CDC_fops =
72 {
73 CDC_Itf_Init,
74 CDC_Itf_DeInit,
75 CDC_Itf_Control,
76 CDC_Itf_Receive
77 };
78
79 /* Private functions ---------------------------------------------------------*/
80
86 static int8_t CDC_Itf_Init(void)
87 {
88 /*##-1- Configure the UART peripheral ######################################*/
89 /* Put the USART peripheral in the Asynchronous mode (UART Mode) */
90 /* USART configured as follow:
91 - Word Length = 8 Bits
92 - Stop Bit = One Stop bit
93 - Parity = No parity
94 - BaudRate = 115200 baud
95 - Hardware flow control disabled (RTS and CTS signals) */
96 UartHandle.Instance = USARTx;
97 UartHandle.Init.BaudRate = 115200;
98 UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
99 UartHandle.Init.StopBits = UART_STOPBITS_1;
100 UartHandle.Init.Parity = UART_PARITY_NONE;
101 UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
102 UartHandle.Init.Mode = UART_MODE_TX_RX;
103 UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
104 if(HAL_UART_Init(&UartHandle) != HAL_OK)
105 {
106 /* Initialization Error */
107 Error_Handler();
108 }
109
110 /*##-2- Put UART peripheral in IT reception process ########################*/
111 /* Any data received will be stored in "UserTxBuffer" buffer */
112 if(HAL_UART_Receive_IT(&UartHandle, (uint8_t *)UserTxBuffer, 1) != HAL_OK)
113 {
114 /* Transfer error in reception process */
115 Error_Handler();
116 }
117
118 /*##-3- Configure the TIM Base generation #################################*/
119 TIM_Config();
120
121 /*##-4- Start the TIM Base generation in interrupt mode ####################*/
122 /* Start Channel1 */
123 if(HAL_TIM_Base_Start_IT(&TimHandle) != HAL_OK)
124 {
125 /* Starting Error */
126 Error_Handler();
127 }
128
129 /*##-5- Set Application Buffers ############################################*/
130 USBD_CDC_SetTxBuffer(&USBD_Device, UserTxBuffer, 0);
131 USBD_CDC_SetRxBuffer(&USBD_Device, UserRxBuffer);
132
133 return (USBD_OK);
134 }
135
142 static int8_t CDC_Itf_DeInit(void)
143 {
144 /* DeInitialize the UART peripheral */
145 if(HAL_UART_DeInit(&UartHandle) != HAL_OK)
146 {
147 /* Initialization Error */
148 Error_Handler();
149 }
150 return (USBD_OK);
151 }
152
161 static int8_t CDC_Itf_Control (uint8_t cmd, uint8_t* pbuf, uint16_t length)
162 {
163 switch (cmd)
164 {
165 case CDC_SEND_ENCAPSULATED_COMMAND:
166 /* Add your code here */
167 break;
168
169 case CDC_GET_ENCAPSULATED_RESPONSE:
170 /* Add your code here */
171 break;
172
173 case CDC_SET_COMM_FEATURE:
174 /* Add your code here */
175 break;
176
177 case CDC_GET_COMM_FEATURE:
178 /* Add your code here */
179 break;
180
181 case CDC_CLEAR_COMM_FEATURE:
182 /* Add your code here */
183 break;
184
185 case CDC_SET_LINE_CODING:
186 LineCoding.bitrate = (uint32_t)(pbuf[0] | (pbuf[1] << 8) |\
187 (pbuf[2] << 16) | (pbuf[3] << 24));
188 LineCoding.format = pbuf[4];
189 LineCoding.paritytype = pbuf[5];
190 LineCoding.datatype = pbuf[6];
191
192 /* Set the new configuration */
193 ComPort_Config();
194 break;
195
196 case CDC_GET_LINE_CODING:
197 pbuf[0] = (uint8_t)(LineCoding.bitrate);
198 pbuf[1] = (uint8_t)(LineCoding.bitrate >> 8);
199 pbuf[2] = (uint8_t)(LineCoding.bitrate >> 16);
200 pbuf[3] = (uint8_t)(LineCoding.bitrate >> 24);
201 pbuf[4] = LineCoding.format;
202 pbuf[5] = LineCoding.paritytype;
203 pbuf[6] = LineCoding.datatype;
204 break;
205
206 case CDC_SET_CONTROL_LINE_STATE:
207 /* Add your code here */
208 break;
209
210 case CDC_SEND_BREAK:
211 /* Add your code here */
212 break;
213
214 default:
215 break;
216 }
217
218 return (USBD_OK);
219 }
220
226 void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
227 {
228 uint32_t buffptr;
229 uint32_t buffsize;
230
231 if(UserTxBufPtrOut != UserTxBufPtrIn)
232 {
233 if(UserTxBufPtrOut > UserTxBufPtrIn) /* Rollback */
234 {
235 buffsize = APP_RX_DATA_SIZE - UserTxBufPtrOut;
236 }
237 else
238 {
239 buffsize = UserTxBufPtrIn - UserTxBufPtrOut;
240 }
241
242 buffptr = UserTxBufPtrOut;
243
244 USBD_CDC_SetTxBuffer(&USBD_Device, (uint8_t*)&UserTxBuffer[buffptr], buffsize);
245
246 if(USBD_CDC_TransmitPacket(&USBD_Device) == USBD_OK)
247 {
248 UserTxBufPtrOut += buffsize;
249 if (UserTxBufPtrOut == APP_RX_DATA_SIZE)
250 {
251 UserTxBufPtrOut = 0;
252 }
253 }
254 }
255 }
256
262 void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
263 {
264 /* Increment Index for buffer writing */
265 UserTxBufPtrIn++;
266
267 /* To avoid buffer overflow */
268 if(UserTxBufPtrIn == APP_RX_DATA_SIZE)
269 {
270 UserTxBufPtrIn = 0;
271 }
272
273 /* Start another reception: provide the buffer pointer with offset and the buffer size */
274 HAL_UART_Receive_IT(huart, (uint8_t *)(UserTxBuffer + UserTxBufPtrIn), 1);
275 }
276
285 static int8_t CDC_Itf_Receive(uint8_t* Buf, uint32_t *Len)
286 {
287 HAL_UART_Transmit_DMA(&UartHandle, Buf, *Len);
288 return (USBD_OK);
289 }
290
296 //original
297
298 void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
299 {
300 // Initiate next USB packet transfer once UART completes transfer (transmitting data over Tx line)
301 USBD_CDC_ReceivePacket(&USBD_Device);
302
303 //real load data starts at UserRxBuffer[3].
304 request = UserRxBuffer[3];
305 }
306
307 //Mulong
308 /*
309 void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
310 {
311 //USBD_CDC_SetRxBuffer(&USBD_Device, &usbRxBuf[0]);
312
313 // Initiate next USB packet transfer once UART completes transfer (transmitting data over Tx line)
314 USBD_CDC_ReceivePacket(&USBD_Device);
315
316 //real load data starts at UserRxBuffer[3].
317 request = UserRxBuffer[3];
318
319 if(UserRxBuffer[3] == 0xFF)
320 {
321 UserTxBuffer[0] = 0xFE;
322 UserTxBuffer[1] = MAJORVERSION;
323 UserTxBuffer[2] = MINORVERSION;
324 UserTxBuffer[3] = 0x12;
325 UserTxBuffer[4] = 0x13;
326 UserTxBuffer[5] = 0x14;
327 UserTxBuffer[6] = 0x15;
328 UserTxBuffer[7] = 0x16;
329 UserTxBuffer[8] = 0x17;
330 UserTxBuffer[9] = 0x18;
331
332 if(USBD_Device.dev_state == USBD_STATE_CONFIGURED)
333 USBD_CDC_TransmitPacket(&USBD_Device);
334 }
335 }
336 */
344 static void ComPort_Config(void)
345 {
346 if(HAL_UART_DeInit(&UartHandle) != HAL_OK)
347 {
348 /* Initialization Error */
349 Error_Handler();
350 }
351
352 /* set the Stop bit */
353 switch (LineCoding.format)
354 {
355 case 0:
356 UartHandle.Init.StopBits = UART_STOPBITS_1;
357 break;
358 case 2:
359 UartHandle.Init.StopBits = UART_STOPBITS_2;
360 break;
361 default :
362 UartHandle.Init.StopBits = UART_STOPBITS_1;
363 break;
364 }
365
366 /* set the parity bit*/
367 switch (LineCoding.paritytype)
368 {
369 case 0:
370 UartHandle.Init.Parity = UART_PARITY_NONE;
371 break;
372 case 1:
373 UartHandle.Init.Parity = UART_PARITY_ODD;
374 break;
375 case 2:
376 UartHandle.Init.Parity = UART_PARITY_EVEN;
377 break;
378 default :
379 UartHandle.Init.Parity = UART_PARITY_NONE;
380 break;
381 }
382
383 /*set the data type : only 8bits and 9bits is supported */
384 switch (LineCoding.datatype)
385 {
386 case 0x07:
387 /* With this configuration a parity (Even or Odd) must be set */
388 UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
389 break;
390 case 0x08:
391 if(UartHandle.Init.Parity == UART_PARITY_NONE)
392 {
393 UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
394 }
395 else
396 {
397 UartHandle.Init.WordLength = UART_WORDLENGTH_9B;
398 }
399
400 break;
401 default :
402 UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
403 break;
404 }
405
406 UartHandle.Init.BaudRate = LineCoding.bitrate;
407 UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
408 UartHandle.Init.Mode = UART_MODE_TX_RX;
409 UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
410
411 if(HAL_UART_Init(&UartHandle) != HAL_OK)
412 {
413 /* Initialization Error */
414 Error_Handler();
415 }
416
417 /* Start reception: provide the buffer pointer with offset and the buffer size */
418 HAL_UART_Receive_IT(&UartHandle, (uint8_t *)(UserTxBuffer + UserTxBufPtrIn), 1);
419 }
420
426 static void TIM_Config(void)
427 {
428 /* Set TIMx instance */
429 TimHandle.Instance = TIMx;
430
431 /* Initialize TIM3 peripheral as follows:
432 + Period = (CDC_POLLING_INTERVAL * 10000) - 1
433 + Prescaler = ((APB1 frequency / 1000000) - 1)
434 + ClockDivision = 0
435 + Counter direction = Up */
436 TimHandle.Init.Period = (CDC_POLLING_INTERVAL*1000) - 1;
437 TimHandle.Init.Prescaler = 84-1;
438 TimHandle.Init.ClockDivision = 0;
439 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
440 if(HAL_TIM_Base_Init(&TimHandle) != HAL_OK)
441 {
442 /* Initialization Error */
443 Error_Handler();
444 }
445 }
446
452 void HAL_UART_ErrorCallback(UART_HandleTypeDef *UartHandle)
453 {
454 /* Transfer error occured in reception and/or transmission process */
455 Error_Handler();
456 }
457
463 static void Error_Handler(void)
464 {
465 /* Add your own code here */
466 }
467
468 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/