111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
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#include <cdc-acm.h>
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#include <cdc.h>
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#include <usb-api.h>
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#include <usb-core.h>
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#include <stdio.h>
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static uint8_t usb_ctrl_data_buffer[32];
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static void
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encapsulated_command(uint8_t *data, unsigned int length)
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{
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printf("Got CDC command: length %d\n", length);
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usb_send_ctrl_status();
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}
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static void
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set_line_encoding(uint8_t *data, unsigned int length)
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{
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if (length == 7) {
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static const char parity_char[] = {'N', 'O', 'E', 'M', 'S'};
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static const char *stop_bits_str[] = {"1","1.5","2"};
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const struct usb_cdc_line_coding *coding =
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(const struct usb_cdc_line_coding *)usb_ctrl_data_buffer;
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char parity = ((coding->bParityType > 4)
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? '?' : parity_char[coding->bParityType]);
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const char *stop_bits = ((coding->bCharFormat > 2)
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? "?" : stop_bits_str[coding->bCharFormat]);
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printf("Got CDC line coding: %ld/%d/%c/%s\n",
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coding->dwDTERate, coding->bDataBits, parity, stop_bits);
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usb_send_ctrl_status();
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} else {
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usb_error_stall();
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}
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}
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static unsigned int
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handle_cdc_acm_requests()
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{
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printf("CDC request %02x %02x\n", usb_setup_buffer.bmRequestType, usb_setup_buffer.bRequest);
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switch(usb_setup_buffer.bmRequestType) {
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case 0x21: /* CDC interface OUT requests */
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/* Check if it's the right interface */
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if (usb_setup_buffer.wIndex != 0) return 0;
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switch(usb_setup_buffer.bRequest) {
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case SET_CONTROL_LINE_STATE:
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if (usb_setup_buffer.wValue & 0x02) {
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puts("Carrier on");
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} else {
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puts("Carrier off");
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}
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if (usb_setup_buffer.wValue & 0x01) {
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puts("DTE on");
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} else {
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puts("DTE off");
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}
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usb_send_ctrl_status();
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return 1;
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case SEND_ENCAPSULATED_COMMAND:
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{
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unsigned int len = usb_setup_buffer.wLength;
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if (len > sizeof(usb_ctrl_data_buffer))
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len = sizeof(usb_ctrl_data_buffer);
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usb_get_ctrl_data(usb_ctrl_data_buffer, len,
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encapsulated_command);
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}
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return 1;
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case SET_LINE_CODING:
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{
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unsigned int len = usb_setup_buffer.wLength;
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if (len > sizeof(usb_ctrl_data_buffer))
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len = sizeof(usb_ctrl_data_buffer);
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usb_get_ctrl_data(usb_ctrl_data_buffer, len,
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set_line_encoding);
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}
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return 1;
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}
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break;
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case 0xa1: /* CDC interface IN requests */
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if (usb_setup_buffer.wIndex != 0) return 0;
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switch(usb_setup_buffer.bRequest) {
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case GET_ENCAPSULATED_RESPONSE:
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printf("CDC response");
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usb_send_ctrl_status();
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return 1;
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}
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}
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return 0;
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}
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static const struct USBRequestHandler cdc_acm_request_handler =
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{
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0x21, 0x7f,
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0x00, 0x00,
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handle_cdc_acm_requests
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};
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static struct USBRequestHandlerHook cdc_acm_request_hook =
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{
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NULL,
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&cdc_acm_request_handler
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};
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void
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usb_cdc_acm_setup()
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{
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usb_register_request_handler(&cdc_acm_request_hook);
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}
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