75 lines
2.1 KiB
C
75 lines
2.1 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 "platform.h"
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#include <libopencm3/usb/usbd.h>
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#include "gdb_if.h"
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#define VIRTUAL_COM_PORT_DATA_SIZE 64
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static uint32_t count_out;
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static uint32_t count_in;
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static uint32_t out_ptr;
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static uint8_t buffer_out[VIRTUAL_COM_PORT_DATA_SIZE];
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static uint8_t buffer_in[VIRTUAL_COM_PORT_DATA_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 == VIRTUAL_COM_PORT_DATA_SIZE)) {
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while(usbd_ep_write_packet(1, buffer_in, count_in) <= 0);
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count_in = 0;
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}
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}
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unsigned char gdb_if_getchar(void)
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{
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while(!(out_ptr < count_out)) {
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while(cdcacm_get_config() != 1);
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count_out = usbd_ep_read_packet(1, buffer_out,
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VIRTUAL_COM_PORT_DATA_SIZE);
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out_ptr = 0;
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}
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return buffer_out[out_ptr++];
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}
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unsigned char gdb_if_getchar_to(int timeout)
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{
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timeout_counter = timeout/100;
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if(!(out_ptr < count_out)) do {
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count_out = usbd_ep_read_packet(1, buffer_out,
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VIRTUAL_COM_PORT_DATA_SIZE);
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out_ptr = 0;
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} while(timeout_counter && !(out_ptr < count_out));
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if(out_ptr < count_out)
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return gdb_if_getchar();
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return -1;
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}
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