circuitpython/ports/stm32/usbd_cdc_interface.h

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/*
* This file is part of the MicroPython project, http://micropython.org/
*/
#ifndef MICROPY_INCLUDED_STM32_USBD_CDC_INTERFACE_H
#define MICROPY_INCLUDED_STM32_USBD_CDC_INTERFACE_H
/**
******************************************************************************
* @file USB_Device/CDC_Standalone/Inc/usbd_cdc_interface.h
* @author MCD Application Team
* @version V1.0.1
* @date 26-February-2014
* @brief Header for usbd_cdc_interface.c file.
******************************************************************************
* @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.
*
******************************************************************************
*/
#define USBD_CDC_RX_DATA_SIZE (1024) // this must be 2 or greater, and a power of 2
#define USBD_CDC_TX_DATA_SIZE (1024) // I think this can be any value (was 2048)
typedef struct _usbd_cdc_itf_t {
usbd_cdc_msc_hid_state_t *usbd; // the parent USB device
uint8_t rx_packet_buf[CDC_DATA_MAX_PACKET_SIZE]; // received data from USB OUT endpoint is stored in this buffer
uint8_t rx_user_buf[USBD_CDC_RX_DATA_SIZE]; // received data is buffered here until the user reads it
volatile uint16_t rx_buf_put; // circular buffer index
uint16_t rx_buf_get; // circular buffer index
uint8_t tx_buf[USBD_CDC_TX_DATA_SIZE]; // data for USB IN endpoind is stored in this buffer
uint16_t tx_buf_ptr_in; // increment this pointer modulo USBD_CDC_TX_DATA_SIZE when new data is available
volatile uint16_t tx_buf_ptr_out; // increment this pointer modulo USBD_CDC_TX_DATA_SIZE when data is drained
uint16_t tx_buf_ptr_out_shadow; // shadow of above
uint8_t tx_buf_ptr_wait_count; // used to implement a timeout waiting for low-level USB driver
uint8_t tx_need_empty_packet; // used to flush the USB IN endpoint if the last packet was exactly the endpoint packet size
volatile uint8_t dev_is_connected; // indicates if we are connected
} usbd_cdc_itf_t;
static inline int usbd_cdc_is_connected(usbd_cdc_itf_t *cdc) {
return cdc->dev_is_connected;
}
int usbd_cdc_tx_half_empty(usbd_cdc_itf_t *cdc);
int usbd_cdc_tx(usbd_cdc_itf_t *cdc, const uint8_t *buf, uint32_t len, uint32_t timeout);
void usbd_cdc_tx_always(usbd_cdc_itf_t *cdc, const uint8_t *buf, uint32_t len);
int usbd_cdc_rx_num(usbd_cdc_itf_t *cdc);
int usbd_cdc_rx(usbd_cdc_itf_t *cdc, uint8_t *buf, uint32_t len, uint32_t timeout);
#endif // MICROPY_INCLUDED_STM32_USBD_CDC_INTERFACE_H