CherryUSB/class/cdc/usbd_cdc.c

/*
 * Copyright (c) 2022, sakumisu
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#include "usbd_core.h"
#include "usbd_cdc.h"

const char *stop_name[] = { "1", "1.5", "2" };
const char *parity_name[] = { "N", "O", "E", "M", "S" };

static int cdc_acm_class_interface_request_handler(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
{
    USB_LOG_DBG("CDC Class request: "
                "bRequest 0x%02x\r\n",
                setup->bRequest);

    struct cdc_line_coding line_coding;
    bool dtr, rts;
    uint8_t intf_num = LO_BYTE(setup->wIndex);

    switch (setup->bRequest) {
        case CDC_REQUEST_SET_LINE_CODING:

            /*******************************************************************************/
            /* Line Coding Structure                                                       */
            /*-----------------------------------------------------------------------------*/
            /* Offset | Field       | Size | Value  | Description                          */
            /* 0      | dwDTERate   |   4  | Number |Data terminal rate, in bits per second*/
            /* 4      | bCharFormat |   1  | Number | Stop bits                            */
            /*                                        0 - 1 Stop bit                       */
            /*                                        1 - 1.5 Stop bits                    */
            /*                                        2 - 2 Stop bits                      */
            /* 5      | bParityType |  1   | Number | Parity                               */
            /*                                        0 - None                             */
            /*                                        1 - Odd                              */
            /*                                        2 - Even                             */
            /*                                        3 - Mark                             */
            /*                                        4 - Space                            */
            /* 6      | bDataBits  |   1   | Number Data bits (5, 6, 7, 8 or 16).          */
            /*******************************************************************************/
            memcpy(&line_coding, *data, setup->wLength);
            USB_LOG_DBG("Set intf:%d linecoding <%d %d %s %s>\r\n",
                        intf_num,
                        line_coding.dwDTERate,
                        line_coding.bDataBits,
                        parity_name[line_coding.bParityType],
                        stop_name[line_coding.bCharFormat]);
            usbd_cdc_acm_set_line_coding(intf_num, &line_coding);
            break;

        case CDC_REQUEST_SET_CONTROL_LINE_STATE: {
            dtr = (setup->wValue & 0x0001);
            rts = (setup->wValue & 0x0002);
            USB_LOG_DBG("Set intf:%d DTR 0x%x,RTS 0x%x\r\n",
                        intf_num,
                        dtr,
                        rts);
            usbd_cdc_acm_set_dtr(intf_num, dtr);
            usbd_cdc_acm_set_rts(intf_num, rts);
        } break;

        case CDC_REQUEST_GET_LINE_CODING:
            usbd_cdc_acm_get_line_coding(intf_num, &line_coding);
            memcpy(*data, &line_coding, 7);
            *len = 7;
            USB_LOG_DBG("Get intf:%d linecoding %d %d %d %d\r\n",
                        intf_num,
                        line_coding.dwDTERate,
                        line_coding.bCharFormat,
                        line_coding.bParityType,
                        line_coding.bDataBits);
            break;

        default:
            USB_LOG_WRN("Unhandled CDC Class bRequest 0x%02x\r\n", setup->bRequest);
            return -1;
    }

    return 0;
}

static void cdc_notify_handler(uint8_t event, void *arg)
{
    switch (event) {
        case USBD_EVENT_RESET:
            break;
        default:
            break;
    }
}

struct usbd_interface *usbd_cdc_acm_alloc_intf(void)
{
    struct usbd_interface *intf = usb_malloc(sizeof(struct usbd_interface));
    if (intf == NULL) {
        USB_LOG_ERR("no mem to alloc intf\r\n");
        return NULL;
    }

    intf->class_interface_handler = cdc_acm_class_interface_request_handler;
    intf->class_endpoint_handler = NULL;
    intf->vendor_handler = NULL;
    intf->notify_handler = cdc_notify_handler;

    return intf;
}

__WEAK void usbd_cdc_acm_set_line_coding(uint8_t intf, struct cdc_line_coding *line_coding)
{
}

__WEAK void usbd_cdc_acm_get_line_coding(uint8_t intf, struct cdc_line_coding *line_coding)
{
    line_coding->dwDTERate = 2000000;
    line_coding->bDataBits = 8;
    line_coding->bParityType = 0;
    line_coding->bCharFormat = 0;
}

__WEAK void usbd_cdc_acm_set_dtr(uint8_t intf, bool dtr)
{
}

__WEAK void usbd_cdc_acm_set_rts(uint8_t intf, bool rts)
{
}