350 lines
14 KiB
C
350 lines
14 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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// 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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uint8_t *usbd_cdc_init(usbd_cdc_itf_t *cdc, usbd_cdc_msc_hid_state_t *usbd) {
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// Link the parent state
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cdc->usbd = usbd;
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// Reset all the CDC state
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// Note: we don't reset tx_buf_ptr_in 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.
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cdc->rx_buf_put = 0;
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cdc->rx_buf_get = 0;
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cdc->tx_buf_ptr_out = 0;
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cdc->tx_buf_ptr_out_shadow = 0;
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cdc->tx_buf_ptr_wait_count = 0;
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cdc->tx_need_empty_packet = 0;
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cdc->dev_is_connected = 0;
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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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// 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_itf_t *cdc, uint8_t cmd, uint8_t* pbuf, uint16_t length) {
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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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cdc->dev_is_connected = length & 1; // wValue is passed in Len (bit of a hack)
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break;
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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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// This function is called to process outgoing data. We hook directly into the
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// SOF (start of frame) callback so that it is called exactly at the time it is
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// needed (reducing latency), and often enough (increasing bandwidth).
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void HAL_PCD_SOFCallback(PCD_HandleTypeDef *hpcd) {
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usbd_cdc_msc_hid_state_t *usbd = ((USBD_HandleTypeDef*)hpcd->pData)->pClassData;
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usbd_cdc_itf_t *cdc = usbd->cdc;
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if (cdc == NULL || !cdc->dev_is_connected) {
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// CDC device is not connected to a host, so we are unable to send any data
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return;
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}
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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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if (cdc->tx_buf_ptr_out != cdc->tx_buf_ptr_out_shadow) {
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// We have sent data and are waiting for the low-level USB driver to
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// finish sending it over the USB in-endpoint.
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// SOF occurs every 1ms, so we have a 500 * 1ms = 500ms timeout
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// We have a relatively large timeout because the USB host may be busy
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// doing other things and we must give it a chance to read our data.
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if (cdc->tx_buf_ptr_wait_count < 500) {
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USB_OTG_GlobalTypeDef *USBx = hpcd->Instance;
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if (USBx_INEP(CDC_IN_EP & 0x7f)->DIEPTSIZ & USB_OTG_DIEPTSIZ_XFRSIZ) {
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// USB in-endpoint is still reading the data
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cdc->tx_buf_ptr_wait_count++;
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return;
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}
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}
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cdc->tx_buf_ptr_out = cdc->tx_buf_ptr_out_shadow;
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}
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if (cdc->tx_buf_ptr_out_shadow != cdc->tx_buf_ptr_in || cdc->tx_need_empty_packet) {
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uint32_t buffptr;
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uint32_t buffsize;
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if (cdc->tx_buf_ptr_out_shadow > cdc->tx_buf_ptr_in) { // rollback
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buffsize = USBD_CDC_TX_DATA_SIZE - cdc->tx_buf_ptr_out_shadow;
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} else {
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buffsize = cdc->tx_buf_ptr_in - cdc->tx_buf_ptr_out_shadow;
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}
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buffptr = cdc->tx_buf_ptr_out_shadow;
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if (USBD_CDC_TransmitPacket(cdc->usbd, buffsize, &cdc->tx_buf[buffptr]) == USBD_OK) {
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cdc->tx_buf_ptr_out_shadow += buffsize;
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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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cdc->tx_buf_ptr_wait_count = 0;
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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 = (buffsize > 0 && buffsize % CDC_DATA_FS_MAX_PACKET_SIZE == 0 && cdc->tx_buf_ptr_out_shadow == cdc->tx_buf_ptr_in);
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}
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}
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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_itf_t *cdc, size_t len) {
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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 (mp_interrupt_char != -1 && *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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// initiate next USB packet transfer
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USBD_CDC_ReceivePacket(cdc->usbd, cdc->rx_packet_buf);
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return USBD_OK;
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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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// 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->dev_is_connected || ((cdc->tx_buf_ptr_in + 1) & (USBD_CDC_TX_DATA_SIZE - 1)) == cdc->tx_buf_ptr_out) {
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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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// 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->dev_is_connected) {
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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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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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// Some unused code that makes sure the low-level USB buffer is drained.
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// Waiting for low-level is handled in HAL_PCD_SOFCallback.
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/*
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start = HAL_GetTick();
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PCD_HandleTypeDef *hpcd = hUSBDDevice.pData;
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if (hpcd->IN_ep[0x83 & 0x7f].is_in) {
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//volatile uint32_t *xfer_count = &hpcd->IN_ep[0x83 & 0x7f].xfer_count;
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//volatile uint32_t *xfer_len = &hpcd->IN_ep[0x83 & 0x7f].xfer_len;
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USB_OTG_GlobalTypeDef *USBx = hpcd->Instance;
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while (
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// *xfer_count < *xfer_len // using this works
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// (USBx_INEP(3)->DIEPTSIZ & USB_OTG_DIEPTSIZ_XFRSIZ) // using this works
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&& HAL_GetTick() - start <= 2000) {
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__WFI(); // enter sleep mode, waiting for interrupt
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}
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}
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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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}
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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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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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__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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// Success, return number of bytes read
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return len;
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}
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