133 lines
3.5 KiB
C
133 lines
3.5 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 "cdcacm.h"
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#include "gdb_if.h"
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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[CDCACM_PACKET_SIZE];
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static uint8_t buffer_in[CDCACM_PACKET_SIZE];
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#ifdef STM32F4
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static volatile uint32_t count_new;
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static uint8_t double_buffer_out[CDCACM_PACKET_SIZE];
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#endif
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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((cdcacm_get_config() != 1) || !cdcacm_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,
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buffer_in, count_in) <= 0);
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if (flush && (count_in == CDCACM_PACKET_SIZE)) {
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/* We need to send an empty packet for some hosts
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* to accept this as a complete transfer. */
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/* libopencm3 needs a change for us to confirm when
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* that transfer is complete, so we just send a packet
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* containing a null byte for now.
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*/
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while (usbd_ep_write_packet(usbdev, CDCACM_GDB_ENDPOINT,
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"\0", 1) <= 0);
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}
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count_in = 0;
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}
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}
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#ifdef STM32F4
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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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usbd_ep_nak_set(dev, CDCACM_GDB_ENDPOINT, 1);
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count_new = usbd_ep_read_packet(dev, CDCACM_GDB_ENDPOINT,
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double_buffer_out, CDCACM_PACKET_SIZE);
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if(!count_new) {
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usbd_ep_nak_set(dev, CDCACM_GDB_ENDPOINT, 0);
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}
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}
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#endif
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static void gdb_if_update_buf(void)
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{
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while (cdcacm_get_config() != 1);
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#ifdef STM32F4
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asm volatile ("cpsid i; isb");
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if (count_new) {
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memcpy(buffer_out, double_buffer_out, count_new);
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count_out = count_new;
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count_new = 0;
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out_ptr = 0;
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usbd_ep_nak_set(usbdev, CDCACM_GDB_ENDPOINT, 0);
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}
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asm volatile ("cpsie i; isb");
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#else
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count_out = usbd_ep_read_packet(usbdev, CDCACM_GDB_ENDPOINT,
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buffer_out, CDCACM_PACKET_SIZE);
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out_ptr = 0;
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#endif
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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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/* Detach if port closed */
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if (!cdcacm_get_dtr())
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return 0x04;
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gdb_if_update_buf();
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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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platform_timeout t;
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platform_timeout_set(&t, timeout);
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if (!(out_ptr < count_out)) do {
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/* Detach if port closed */
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if (!cdcacm_get_dtr())
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return 0x04;
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gdb_if_update_buf();
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} while (!platform_timeout_is_expired(&t) && !(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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