418 lines
16 KiB
C
418 lines
16 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* Taken from ST Cube library and heavily modified. See below for original
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* copyright header.
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*/
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/**
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******************************************************************************
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* @file USB_Device/CDC_Standalone/Src/usbd_cdc_interface.c
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* @author MCD Application Team
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* @version V1.0.1
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* @date 26-February-2014
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* @brief Source file for USBD CDC interface
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT(c) 2014 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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/* Includes ------------------------------------------------------------------*/
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#include <stdbool.h>
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#include <stdint.h>
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#include "usbd_cdc_msc_hid.h"
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#include "usbd_cdc_interface.h"
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#include "pendsv.h"
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#include "py/obj.h"
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#include "lib/utils/interrupt_char.h"
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#include "irq.h"
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#if MICROPY_HW_ENABLE_USB
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// CDC control commands
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#define CDC_SEND_ENCAPSULATED_COMMAND 0x00
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#define CDC_GET_ENCAPSULATED_RESPONSE 0x01
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#define CDC_SET_COMM_FEATURE 0x02
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#define CDC_GET_COMM_FEATURE 0x03
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#define CDC_CLEAR_COMM_FEATURE 0x04
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#define CDC_SET_LINE_CODING 0x20
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#define CDC_GET_LINE_CODING 0x21
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#define CDC_SET_CONTROL_LINE_STATE 0x22
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#define CDC_SEND_BREAK 0x23
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// Used to control the connect_state variable when USB host opens the serial port
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static uint8_t usbd_cdc_connect_tx_timer;
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uint8_t *usbd_cdc_init(usbd_cdc_state_t *cdc_in) {
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usbd_cdc_itf_t *cdc = (usbd_cdc_itf_t*)cdc_in;
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// Reset the CDC state due to a new USB host connection
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// Note: we don't reset tx_buf_ptr_* in order to allow the output buffer to
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// be filled (by usbd_cdc_tx_always) before the USB device is connected, and
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// to retain transmit buffer state across multiple USB connections (they will
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// be 0 at MCU reset since the variables live in the BSS).
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cdc->rx_buf_put = 0;
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cdc->rx_buf_get = 0;
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cdc->rx_buf_full = false;
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cdc->tx_need_empty_packet = 0;
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cdc->connect_state = USBD_CDC_CONNECT_STATE_DISCONNECTED;
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if (cdc->attached_to_repl) {
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// Default behavior is non-blocking when attached to repl
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cdc->flow &= ~USBD_CDC_FLOWCONTROL_CTS;
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} else {
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cdc->flow |= USBD_CDC_FLOWCONTROL_CTS;
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}
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// Return the buffer to place the first USB OUT packet
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return cdc->rx_packet_buf;
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}
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void usbd_cdc_deinit(usbd_cdc_state_t *cdc_in) {
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usbd_cdc_itf_t *cdc = (usbd_cdc_itf_t*)cdc_in;
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cdc->connect_state = USBD_CDC_CONNECT_STATE_DISCONNECTED;
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}
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// Manage the CDC class requests
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// cmd: command code
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// pbuf: buffer containing command data (request parameters)
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// length: number of data to be sent (in bytes)
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// Returns USBD_OK if all operations are OK else USBD_FAIL
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int8_t usbd_cdc_control(usbd_cdc_state_t *cdc_in, uint8_t cmd, uint8_t* pbuf, uint16_t length) {
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usbd_cdc_itf_t *cdc = (usbd_cdc_itf_t*)cdc_in;
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switch (cmd) {
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case CDC_SEND_ENCAPSULATED_COMMAND:
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/* Add your code here */
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break;
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case CDC_GET_ENCAPSULATED_RESPONSE:
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/* Add your code here */
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break;
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case CDC_SET_COMM_FEATURE:
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/* Add your code here */
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break;
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case CDC_GET_COMM_FEATURE:
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/* Add your code here */
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break;
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case CDC_CLEAR_COMM_FEATURE:
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/* Add your code here */
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break;
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case CDC_SET_LINE_CODING:
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#if 0
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LineCoding.bitrate = (uint32_t)(pbuf[0] | (pbuf[1] << 8) |\
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(pbuf[2] << 16) | (pbuf[3] << 24));
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LineCoding.format = pbuf[4];
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LineCoding.paritytype = pbuf[5];
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LineCoding.datatype = pbuf[6];
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/* Set the new configuration */
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#endif
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break;
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case CDC_GET_LINE_CODING:
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/* Add your code here */
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pbuf[0] = (uint8_t)(115200);
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pbuf[1] = (uint8_t)(115200 >> 8);
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pbuf[2] = (uint8_t)(115200 >> 16);
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pbuf[3] = (uint8_t)(115200 >> 24);
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pbuf[4] = 0; // stop bits (1)
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pbuf[5] = 0; // parity (none)
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pbuf[6] = 8; // number of bits (8)
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break;
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case CDC_SET_CONTROL_LINE_STATE: {
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// wValue, indicating the state, is passed in length (bit of a hack)
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if (length & 1) {
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// The actual connection state is delayed to give the host a chance to
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// configure its serial port (in most cases to disable local echo)
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cdc->connect_state = USBD_CDC_CONNECT_STATE_CONNECTING;
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usbd_cdc_connect_tx_timer = 8; // wait for 8 SOF IRQs
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#if !MICROPY_HW_USB_IS_MULTI_OTG
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USB->CNTR |= USB_CNTR_SOFM;
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#else
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PCD_HandleTypeDef *hpcd = cdc->base.usbd->pdev->pData;
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hpcd->Instance->GINTMSK |= USB_OTG_GINTMSK_SOFM;
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#endif
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} else {
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cdc->connect_state = USBD_CDC_CONNECT_STATE_DISCONNECTED;
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}
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break;
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}
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case CDC_SEND_BREAK:
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/* Add your code here */
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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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// Called when the USB IN endpoint is ready to receive more data
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// (cdc.base.tx_in_progress must be 0)
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void usbd_cdc_tx_ready(usbd_cdc_state_t *cdc_in) {
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usbd_cdc_itf_t *cdc = (usbd_cdc_itf_t*)cdc_in;
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cdc->tx_buf_ptr_out = cdc->tx_buf_ptr_out_shadow;
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if (cdc->tx_buf_ptr_out == cdc->tx_buf_ptr_in && !cdc->tx_need_empty_packet) {
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// No outstanding data to send
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return;
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}
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uint32_t len;
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if (cdc->tx_buf_ptr_out > cdc->tx_buf_ptr_in) { // rollback
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len = USBD_CDC_TX_DATA_SIZE - cdc->tx_buf_ptr_out;
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} else {
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len = cdc->tx_buf_ptr_in - cdc->tx_buf_ptr_out;
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}
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// Should always succeed because cdc.base.tx_in_progress==0
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USBD_CDC_TransmitPacket(&cdc->base, len, &cdc->tx_buf[cdc->tx_buf_ptr_out]);
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cdc->tx_buf_ptr_out_shadow += len;
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if (cdc->tx_buf_ptr_out_shadow == USBD_CDC_TX_DATA_SIZE) {
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cdc->tx_buf_ptr_out_shadow = 0;
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}
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// According to the USB specification, a packet size of 64 bytes (CDC_DATA_FS_MAX_PACKET_SIZE)
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// gets held at the USB host until the next packet is sent. This is because a
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// packet of maximum size is considered to be part of a longer chunk of data, and
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// the host waits for all data to arrive (ie, waits for a packet < max packet size).
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// To flush a packet of exactly max packet size, we need to send a zero-size packet.
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// See eg http://www.cypress.com/?id=4&rID=92719
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cdc->tx_need_empty_packet = (len > 0 && len % usbd_cdc_max_packet(cdc->base.usbd->pdev) == 0 && cdc->tx_buf_ptr_out_shadow == cdc->tx_buf_ptr_in);
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}
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// Attempt to queue data on the USB IN endpoint
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static void usbd_cdc_try_tx(usbd_cdc_itf_t *cdc) {
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uint32_t basepri = raise_irq_pri(IRQ_PRI_OTG_FS);
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if (cdc == NULL || cdc->connect_state == USBD_CDC_CONNECT_STATE_DISCONNECTED) {
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// CDC device is not connected to a host, so we are unable to send any data
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} else if (cdc->base.tx_in_progress) {
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// USB driver will call callback when ready
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} else {
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usbd_cdc_tx_ready(&cdc->base);
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}
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restore_irq_pri(basepri);
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}
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void HAL_PCD_SOFCallback(PCD_HandleTypeDef *hpcd) {
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if (usbd_cdc_connect_tx_timer > 0) {
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--usbd_cdc_connect_tx_timer;
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} else {
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usbd_cdc_msc_hid_state_t *usbd = ((USBD_HandleTypeDef*)hpcd->pData)->pClassData;
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#if !MICROPY_HW_USB_IS_MULTI_OTG
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USB->CNTR &= ~USB_CNTR_SOFM;
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#else
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hpcd->Instance->GINTMSK &= ~USB_OTG_GINTMSK_SOFM;
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#endif
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for (int i = 0; i < MICROPY_HW_USB_CDC_NUM; ++i) {
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usbd_cdc_itf_t *cdc = (usbd_cdc_itf_t*)usbd->cdc[i];
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if (cdc->connect_state == USBD_CDC_CONNECT_STATE_CONNECTING) {
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cdc->connect_state = USBD_CDC_CONNECT_STATE_CONNECTED;
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usbd_cdc_try_tx(cdc);
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}
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}
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}
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}
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bool usbd_cdc_rx_buffer_full(usbd_cdc_itf_t *cdc) {
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int get = cdc->rx_buf_get, put = cdc->rx_buf_put;
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int remaining = (get - put) + (-((int) (get <= put)) & USBD_CDC_RX_DATA_SIZE);
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return remaining < CDC_DATA_MAX_PACKET_SIZE + 1;
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}
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void usbd_cdc_rx_check_resume(usbd_cdc_itf_t *cdc) {
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uint32_t irq_state = disable_irq();
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if (cdc->rx_buf_full) {
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if (!usbd_cdc_rx_buffer_full(cdc)) {
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cdc->rx_buf_full = false;
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enable_irq(irq_state);
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USBD_CDC_ReceivePacket(&cdc->base, cdc->rx_packet_buf);
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return;
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}
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}
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enable_irq(irq_state);
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}
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// Data received over USB OUT endpoint is processed here.
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// len: number of bytes received into the buffer we passed to USBD_CDC_ReceivePacket
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// Returns USBD_OK if all operations are OK else USBD_FAIL
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int8_t usbd_cdc_receive(usbd_cdc_state_t *cdc_in, size_t len) {
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usbd_cdc_itf_t *cdc = (usbd_cdc_itf_t*)cdc_in;
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// copy the incoming data into the circular buffer
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for (const uint8_t *src = cdc->rx_packet_buf, *top = cdc->rx_packet_buf + len; src < top; ++src) {
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if (cdc->attached_to_repl && *src == mp_interrupt_char) {
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pendsv_kbd_intr();
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} else {
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uint16_t next_put = (cdc->rx_buf_put + 1) & (USBD_CDC_RX_DATA_SIZE - 1);
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if (next_put == cdc->rx_buf_get) {
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// overflow, we just discard the rest of the chars
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break;
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}
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cdc->rx_user_buf[cdc->rx_buf_put] = *src;
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cdc->rx_buf_put = next_put;
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}
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}
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if ((cdc->flow & USBD_CDC_FLOWCONTROL_RTS) && (usbd_cdc_rx_buffer_full(cdc))) {
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cdc->rx_buf_full = true;
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return USBD_BUSY;
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} else {
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// initiate next USB packet transfer
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cdc->rx_buf_full = false;
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return USBD_CDC_ReceivePacket(&cdc->base, cdc->rx_packet_buf);
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}
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}
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int usbd_cdc_tx_half_empty(usbd_cdc_itf_t *cdc) {
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int32_t tx_waiting = (int32_t)cdc->tx_buf_ptr_in - (int32_t)cdc->tx_buf_ptr_out;
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if (tx_waiting < 0) {
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tx_waiting += USBD_CDC_TX_DATA_SIZE;
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}
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return tx_waiting <= USBD_CDC_TX_DATA_SIZE / 2;
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}
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// Writes only the data that fits if flow & CTS, else writes all data
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// Returns number of bytes actually written to the device
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int usbd_cdc_tx_flow(usbd_cdc_itf_t *cdc, const uint8_t *buf, uint32_t len) {
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if (cdc->flow & USBD_CDC_FLOWCONTROL_CTS) {
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// Only write as much as can fit in tx buffer
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return usbd_cdc_tx(cdc, buf, len, 0);
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} else {
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// Never block, keep most recent data in rolling buffer
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usbd_cdc_tx_always(cdc, buf, len);
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return len;
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}
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}
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// timout in milliseconds.
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// Returns number of bytes written to the device.
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int usbd_cdc_tx(usbd_cdc_itf_t *cdc, const uint8_t *buf, uint32_t len, uint32_t timeout) {
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for (uint32_t i = 0; i < len; i++) {
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// Wait until the device is connected and the buffer has space, with a given timeout
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uint32_t start = HAL_GetTick();
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while (cdc->connect_state == USBD_CDC_CONNECT_STATE_DISCONNECTED
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|| ((cdc->tx_buf_ptr_in + 1) & (USBD_CDC_TX_DATA_SIZE - 1)) == cdc->tx_buf_ptr_out) {
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usbd_cdc_try_tx(cdc);
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// Wraparound of tick is taken care of by 2's complement arithmetic.
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if (HAL_GetTick() - start >= timeout) {
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// timeout
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return i;
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}
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if (query_irq() == IRQ_STATE_DISABLED) {
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// IRQs disabled so buffer will never be drained; return immediately
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return i;
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}
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__WFI(); // enter sleep mode, waiting for interrupt
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}
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// Write data to device buffer
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cdc->tx_buf[cdc->tx_buf_ptr_in] = buf[i];
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cdc->tx_buf_ptr_in = (cdc->tx_buf_ptr_in + 1) & (USBD_CDC_TX_DATA_SIZE - 1);
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}
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usbd_cdc_try_tx(cdc);
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// Success, return number of bytes read
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return len;
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}
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// Always write all of the data to the device tx buffer, even if the
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// device is not connected, or if the buffer is full. Has a small timeout
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// to wait for the buffer to be drained, in the case the device is connected.
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void usbd_cdc_tx_always(usbd_cdc_itf_t *cdc, const uint8_t *buf, uint32_t len) {
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for (int i = 0; i < len; i++) {
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// If the CDC device is not connected to the host then we don't have anyone to receive our data.
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// The device may become connected in the future, so we should at least try to fill the buffer
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// and hope that it doesn't overflow by the time the device connects.
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// If the device is not connected then we should go ahead and fill the buffer straight away,
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// ignoring overflow. Otherwise, we should make sure that we have enough room in the buffer.
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if (cdc->connect_state != USBD_CDC_CONNECT_STATE_DISCONNECTED) {
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// If the buffer is full, wait until it gets drained, with a timeout of 500ms
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// (wraparound of tick is taken care of by 2's complement arithmetic).
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uint32_t start = HAL_GetTick();
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while (((cdc->tx_buf_ptr_in + 1) & (USBD_CDC_TX_DATA_SIZE - 1)) == cdc->tx_buf_ptr_out && HAL_GetTick() - start <= 500) {
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usbd_cdc_try_tx(cdc);
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if (query_irq() == IRQ_STATE_DISABLED) {
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// IRQs disabled so buffer will never be drained; exit loop
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break;
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}
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__WFI(); // enter sleep mode, waiting for interrupt
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}
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}
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cdc->tx_buf[cdc->tx_buf_ptr_in] = buf[i];
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cdc->tx_buf_ptr_in = (cdc->tx_buf_ptr_in + 1) & (USBD_CDC_TX_DATA_SIZE - 1);
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}
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usbd_cdc_try_tx(cdc);
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}
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// Returns number of bytes in the rx buffer.
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int usbd_cdc_rx_num(usbd_cdc_itf_t *cdc) {
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int32_t rx_waiting = (int32_t)cdc->rx_buf_put - (int32_t)cdc->rx_buf_get;
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if (rx_waiting < 0) {
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rx_waiting += USBD_CDC_RX_DATA_SIZE;
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}
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usbd_cdc_rx_check_resume(cdc);
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return rx_waiting;
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}
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// timout in milliseconds.
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// Returns number of bytes read from the device.
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int usbd_cdc_rx(usbd_cdc_itf_t *cdc, uint8_t *buf, uint32_t len, uint32_t timeout) {
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// loop to read bytes
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for (uint32_t i = 0; i < len; i++) {
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// Wait until we have at least 1 byte to read
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uint32_t start = HAL_GetTick();
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while (cdc->rx_buf_put == cdc->rx_buf_get) {
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// Wraparound of tick is taken care of by 2's complement arithmetic.
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if (HAL_GetTick() - start >= timeout) {
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// timeout
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return i;
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}
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if (query_irq() == IRQ_STATE_DISABLED) {
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// IRQs disabled so buffer will never be filled; return immediately
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return i;
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}
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usbd_cdc_rx_check_resume(cdc);
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__WFI(); // enter sleep mode, waiting for interrupt
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}
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// Copy byte from device to user buffer
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buf[i] = cdc->rx_user_buf[cdc->rx_buf_get];
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cdc->rx_buf_get = (cdc->rx_buf_get + 1) & (USBD_CDC_RX_DATA_SIZE - 1);
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}
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usbd_cdc_rx_check_resume(cdc);
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// Success, return number of bytes read
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return len;
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}
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#endif
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