/* * This file is part of the Black Magic Debug project. * * Copyright (C) 2011 Black Sphere Technologies Ltd. * Written by Gareth McMullin * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ /* This file implements a transparent channel over which the GDB Remote * Serial Debugging protocol is implemented. This implementation for STM32 * uses the USB CDC-ACM device bulk endpoints to implement the channel. */ #include "platform.h" #include #include "gdb_if.h" static uint32_t count_out; static uint32_t count_in; static uint32_t out_ptr; static uint8_t buffer_out[CDCACM_PACKET_SIZE]; static uint8_t buffer_in[CDCACM_PACKET_SIZE]; void gdb_if_putchar(unsigned char c, int flush) { buffer_in[count_in++] = c; if(flush || (count_in == CDCACM_PACKET_SIZE)) { /* Refuse to send if USB isn't configured, and * don't bother if nobody's listening */ if((cdcacm_get_config() != 1) || !cdcacm_get_dtr()) { count_in = 0; return; } while(usbd_ep_write_packet(usbdev, CDCACM_GDB_ENDPOINT, buffer_in, count_in) <= 0); count_in = 0; } } unsigned char gdb_if_getchar(void) { while(!(out_ptr < count_out)) { /* Detach if port closed */ if(!cdcacm_get_dtr()) return 0x04; while(cdcacm_get_config() != 1); count_out = usbd_ep_read_packet(usbdev, CDCACM_GDB_ENDPOINT, buffer_out, CDCACM_PACKET_SIZE); out_ptr = 0; } return buffer_out[out_ptr++]; } unsigned char gdb_if_getchar_to(int timeout) { timeout_counter = timeout/100; if(!(out_ptr < count_out)) do { /* Detach if port closed */ if(!cdcacm_get_dtr()) return 0x04; count_out = usbd_ep_read_packet(usbdev, CDCACM_GDB_ENDPOINT, buffer_out, CDCACM_PACKET_SIZE); out_ptr = 0; } while(timeout_counter && !(out_ptr < count_out)); if(out_ptr < count_out) return gdb_if_getchar(); return -1; }