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/**
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******************************************************************************
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* @file usbd_cdc_vcp.c
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* @author MCD Application Team
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* @version V1.1.0
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* @date 19-March-2012
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* @brief Generic media access Layer.
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT 2012 STMicroelectronics</center></h2>
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*
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* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
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* You may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.st.com/software_license_agreement_liberty_v2
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************
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*/
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#ifdef USB_OTG_HS_INTERNAL_DMA_ENABLED
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#pragma data_alignment = 4
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#endif /* USB_OTG_HS_INTERNAL_DMA_ENABLED */
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/* Includes ------------------------------------------------------------------*/
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#include "usbd_cdc_vcp.h"
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#include "usb_conf.h"
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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LINE_CODING linecoding =
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{
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115200, /* baud rate*/
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0x00, /* stop bits-1*/
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0x00, /* parity - none*/
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0x08 /* nb. of bits 8*/
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};
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USART_InitTypeDef USART_InitStructure;
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/* These are external variables imported from CDC core to be used for IN
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transfer management. */
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extern uint8_t APP_Rx_Buffer []; /* Write CDC received data in this buffer.
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These data will be sent over USB IN endpoint
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in the CDC core functions. */
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extern uint32_t APP_Rx_ptr_in; /* Increment this pointer or roll it back to
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start address when writing received data
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in the buffer APP_Rx_Buffer. */
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/* Private function prototypes -----------------------------------------------*/
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static uint16_t VCP_Init (void);
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static uint16_t VCP_DeInit (void);
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static uint16_t VCP_Ctrl (uint32_t Cmd, uint8_t* Buf, uint32_t Len);
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static uint16_t VCP_DataTx (uint8_t* Buf, uint32_t Len);
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static uint16_t VCP_DataRx (uint8_t* Buf, uint32_t Len);
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static uint16_t VCP_COMConfig(uint8_t Conf);
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CDC_IF_Prop_TypeDef VCP_fops =
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{
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VCP_Init,
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VCP_DeInit,
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VCP_Ctrl,
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VCP_DataTx,
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VCP_DataRx
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};
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief VCP_Init
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* Initializes the Media on the STM32
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* @param None
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* @retval Result of the opeartion (USBD_OK in all cases)
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*/
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static uint16_t VCP_Init(void)
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{
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NVIC_InitTypeDef NVIC_InitStructure;
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/* EVAL_COM1 default configuration */
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/* EVAL_COM1 configured as follow:
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- BaudRate = 115200 baud
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- Word Length = 8 Bits
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- One Stop Bit
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- Parity Odd
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- Hardware flow control disabled
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- Receive and transmit enabled
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*/
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USART_InitStructure.USART_BaudRate = 115200;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_Odd;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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/* Configure and enable the USART */
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STM_EVAL_COMInit(COM1, &USART_InitStructure);
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/* Enable the USART Receive interrupt */
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USART_ITConfig(EVAL_COM1, USART_IT_RXNE, ENABLE);
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/* Enable USART Interrupt */
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NVIC_InitStructure.NVIC_IRQChannel = EVAL_COM1_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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return USBD_OK;
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}
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/**
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* @brief VCP_DeInit
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* DeInitializes the Media on the STM32
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* @param None
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* @retval Result of the opeartion (USBD_OK in all cases)
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*/
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static uint16_t VCP_DeInit(void)
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{
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return USBD_OK;
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}
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/**
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* @brief VCP_Ctrl
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* Manage the CDC class requests
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* @param Cmd: Command code
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* @param Buf: Buffer containing command data (request parameters)
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* @param Len: Number of data to be sent (in bytes)
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* @retval Result of the opeartion (USBD_OK in all cases)
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*/
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static uint16_t VCP_Ctrl (uint32_t Cmd, uint8_t* Buf, uint32_t Len)
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{
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switch (Cmd)
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{
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case SEND_ENCAPSULATED_COMMAND:
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/* Not needed for this driver */
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break;
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case GET_ENCAPSULATED_RESPONSE:
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/* Not needed for this driver */
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break;
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case SET_COMM_FEATURE:
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/* Not needed for this driver */
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break;
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case GET_COMM_FEATURE:
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/* Not needed for this driver */
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break;
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case CLEAR_COMM_FEATURE:
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/* Not needed for this driver */
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break;
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case SET_LINE_CODING:
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linecoding.bitrate = (uint32_t)(Buf[0] | (Buf[1] << 8) | (Buf[2] << 16) | (Buf[3] << 24));
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linecoding.format = Buf[4];
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linecoding.paritytype = Buf[5];
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linecoding.datatype = Buf[6];
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/* Set the new configuration */
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VCP_COMConfig(OTHER_CONFIG);
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break;
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case GET_LINE_CODING:
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Buf[0] = (uint8_t)(linecoding.bitrate);
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Buf[1] = (uint8_t)(linecoding.bitrate >> 8);
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Buf[2] = (uint8_t)(linecoding.bitrate >> 16);
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Buf[3] = (uint8_t)(linecoding.bitrate >> 24);
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Buf[4] = linecoding.format;
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Buf[5] = linecoding.paritytype;
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Buf[6] = linecoding.datatype;
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break;
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case SET_CONTROL_LINE_STATE:
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/* Not needed for this driver */
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break;
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case SEND_BREAK:
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/* Not needed for this driver */
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break;
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default:
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break;
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}
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return USBD_OK;
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}
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/**
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* @brief VCP_DataTx
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* CDC received data to be send over USB IN endpoint are managed in
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* this function.
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* @param Buf: Buffer of data to be sent
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* @param Len: Number of data to be sent (in bytes)
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* @retval Result of the opeartion: USBD_OK if all operations are OK else VCP_FAIL
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*/
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static uint16_t VCP_DataTx (uint8_t* Buf, uint32_t Len)
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{
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if (linecoding.datatype == 7)
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{
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APP_Rx_Buffer[APP_Rx_ptr_in] = USART_ReceiveData(EVAL_COM1) & 0x7F;
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}
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else if (linecoding.datatype == 8)
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{
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APP_Rx_Buffer[APP_Rx_ptr_in] = USART_ReceiveData(EVAL_COM1);
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}
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APP_Rx_ptr_in++;
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/* To avoid buffer overflow */
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if(APP_Rx_ptr_in == APP_RX_DATA_SIZE)
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{
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APP_Rx_ptr_in = 0;
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}
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return USBD_OK;
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}
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/**
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* @brief VCP_DataRx
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* Data received over USB OUT endpoint are sent over CDC interface
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* through this function.
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*
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* @note
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* This function will block any OUT packet reception on USB endpoint
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* untill exiting this function. If you exit this function before transfer
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* is complete on CDC interface (ie. using DMA controller) it will result
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* in receiving more data while previous ones are still not sent.
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*
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* @param Buf: Buffer of data to be received
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* @param Len: Number of data received (in bytes)
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* @retval Result of the opeartion: USBD_OK if all operations are OK else VCP_FAIL
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*/
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static uint16_t VCP_DataRx (uint8_t* Buf, uint32_t Len)
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{
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uint32_t i;
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for (i = 0; i < Len; i++)
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{
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USART_SendData(EVAL_COM1, *(Buf + i) );
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while(USART_GetFlagStatus(EVAL_COM1, USART_FLAG_TXE) == RESET);
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}
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return USBD_OK;
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}
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/**
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* @brief VCP_COMConfig
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* Configure the COM Port with default values or values received from host.
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* @param Conf: can be DEFAULT_CONFIG to set the default configuration or OTHER_CONFIG
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* to set a configuration received from the host.
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* @retval None.
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*/
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static uint16_t VCP_COMConfig(uint8_t Conf)
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{
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if (Conf == DEFAULT_CONFIG)
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{
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/* EVAL_COM1 default configuration */
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/* EVAL_COM1 configured as follow:
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- BaudRate = 115200 baud
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- Word Length = 8 Bits
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- One Stop Bit
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- Parity Odd
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- Hardware flow control disabled
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- Receive and transmit enabled
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*/
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USART_InitStructure.USART_BaudRate = 115200;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_Odd;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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/* Configure and enable the USART */
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STM_EVAL_COMInit(COM1, &USART_InitStructure);
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/* Enable the USART Receive interrupt */
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USART_ITConfig(EVAL_COM1, USART_IT_RXNE, ENABLE);
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}
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else
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{
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/* set the Stop bit*/
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switch (linecoding.format)
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{
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case 0:
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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break;
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case 1:
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USART_InitStructure.USART_StopBits = USART_StopBits_1_5;
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break;
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case 2:
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USART_InitStructure.USART_StopBits = USART_StopBits_2;
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break;
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default :
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VCP_COMConfig(DEFAULT_CONFIG);
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return (USBD_FAIL);
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}
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/* set the parity bit*/
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switch (linecoding.paritytype)
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{
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case 0:
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USART_InitStructure.USART_Parity = USART_Parity_No;
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break;
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case 1:
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USART_InitStructure.USART_Parity = USART_Parity_Even;
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break;
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case 2:
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USART_InitStructure.USART_Parity = USART_Parity_Odd;
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break;
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default :
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VCP_COMConfig(DEFAULT_CONFIG);
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return (USBD_FAIL);
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}
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/*set the data type : only 8bits and 9bits is supported */
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switch (linecoding.datatype)
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{
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case 0x07:
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/* With this configuration a parity (Even or Odd) should be set */
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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break;
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case 0x08:
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if (USART_InitStructure.USART_Parity == USART_Parity_No)
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{
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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}
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else
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{
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USART_InitStructure.USART_WordLength = USART_WordLength_9b;
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}
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break;
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default :
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VCP_COMConfig(DEFAULT_CONFIG);
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return (USBD_FAIL);
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}
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USART_InitStructure.USART_BaudRate = linecoding.bitrate;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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/* Configure and enable the USART */
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STM_EVAL_COMInit(COM1, &USART_InitStructure);
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}
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return USBD_OK;
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}
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/**
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* @brief EVAL_COM_IRQHandler
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*
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* @param None.
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* @retval None.
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*/
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void EVAL_COM_IRQHandler(void)
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{
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if (USART_GetITStatus(EVAL_COM1, USART_IT_RXNE) != RESET)
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{
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/* Send the received data to the PC Host*/
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VCP_DataTx (0,0);
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}
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/* If overrun condition occurs, clear the ORE flag and recover communication */
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if (USART_GetFlagStatus(EVAL_COM1, USART_FLAG_ORE) != RESET)
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{
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(void)USART_ReceiveData(EVAL_COM1);
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}
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}
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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