101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/*
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* This file is part of the Black Magic Debug project.
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*
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* Copyright (C) 2011 Black Sphere Technologies Ltd.
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* Written by Gareth McMullin <gareth@blacksphere.co.nz>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* This file implements a transparent channel over which the GDB Remote
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* Serial Debugging protocol is implemented. This implementation for STM32
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* uses the USB CDC-ACM device bulk endpoints to implement the channel.
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*/
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#include "general.h"
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#include "gdb_if.h"
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#include "usb_serial.h"
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#include <libopencm3/usb/usbd.h>
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static volatile uint32_t head_out, tail_out;
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static volatile uint32_t count_in;
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static volatile uint8_t buffer_out[16*CDCACM_PACKET_SIZE];
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static volatile uint8_t buffer_in[CDCACM_PACKET_SIZE];
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void gdb_if_putchar(unsigned char c, int flush)
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{
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buffer_in[count_in++] = c;
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if (flush || count_in == CDCACM_PACKET_SIZE) {
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/* Refuse to send if USB isn't configured, and
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* don't bother if nobody's listening */
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if (usb_get_config() != 1 || !gdb_serial_get_dtr()) {
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count_in = 0;
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return;
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}
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while (usbd_ep_write_packet(usbdev, CDCACM_GDB_ENDPOINT, (uint8_t *)buffer_in, count_in) <= 0)
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continue;
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count_in = 0;
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}
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}
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void gdb_usb_out_cb(usbd_device *dev, uint8_t ep)
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{
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(void)ep;
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static uint8_t buf[CDCACM_PACKET_SIZE];
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usbd_ep_nak_set(dev, CDCACM_GDB_ENDPOINT, 1);
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uint32_t count = usbd_ep_read_packet(dev, CDCACM_GDB_ENDPOINT, (uint8_t *)buf, CDCACM_PACKET_SIZE);
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for (uint32_t idx = 0; idx < count; idx++)
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buffer_out[head_out++ % sizeof(buffer_out)] = buf[idx];
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usbd_ep_nak_set(dev, CDCACM_GDB_ENDPOINT, 0);
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}
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unsigned char gdb_if_getchar(void)
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{
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while (tail_out == head_out) {
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/* Detach if port closed */
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if (!gdb_serial_get_dtr())
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return 0x04;
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while (usb_get_config() != 1)
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continue;
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}
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return buffer_out[tail_out++ % sizeof(buffer_out)];
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}
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unsigned char gdb_if_getchar_to(int timeout)
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{
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platform_timeout t;
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platform_timeout_set(&t, timeout);
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if (head_out == tail_out)
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do {
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/* Detach if port closed */
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if (!gdb_serial_get_dtr())
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return 0x04;
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while (usb_get_config() != 1)
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continue;
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} while (!platform_timeout_is_expired(&t) && head_out == tail_out);
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if (head_out != tail_out)
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return gdb_if_getchar();
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return -1;
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}
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