135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
/*
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* This file is part of the Black Magic Debug project.
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*
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* MIT License
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*
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* Copyright (c) 2021 Koen De Vleeschauwer
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "general.h"
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#include "platform.h"
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#include <assert.h>
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#include "cdcacm.h"
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#include "rtt.h"
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#include "rtt_if.h"
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/*********************************************************************
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*
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* rtt terminal i/o
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*
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**********************************************************************
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*/
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/* usb uart receive buffer */
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static char recv_buf[RTT_DOWN_BUF_SIZE];
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static uint32_t recv_head = 0;
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static uint32_t recv_tail = 0;
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/* data from host to target: number of free bytes in usb receive buffer */
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inline static uint32_t recv_bytes_free()
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{
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if (recv_tail <= recv_head)
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return sizeof(recv_buf) - recv_head + recv_tail - 1;
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else
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return recv_tail - recv_head - 1;
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}
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/* data from host to target: true if not enough free buffer space and we need to close flow control */
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inline static bool recv_set_nak()
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{
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assert(sizeof(recv_buf) > 2 * CDCACM_PACKET_SIZE);
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return recv_bytes_free() < 2 * CDCACM_PACKET_SIZE;
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}
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/* usbuart_usb_out_cb is called when usb uart has received new data for target.
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this routine has to be fast */
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void usbuart_usb_out_cb(usbd_device *dev, uint8_t ep)
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{
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(void)dev;
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(void)ep;
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char usb_buf[CDCACM_PACKET_SIZE];
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/* close flow control while processing packet */
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usbd_ep_nak_set(usbdev, CDCACM_UART_ENDPOINT, 1);
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const uint16_t len = usbd_ep_read_packet(usbdev, CDCACM_UART_ENDPOINT, usb_buf, CDCACM_PACKET_SIZE);
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/* skip flag: drop packet if not enough free buffer space */
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if (rtt_flag_skip && len > recv_bytes_free()) {
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usbd_ep_nak_set(usbdev, CDCACM_UART_ENDPOINT, 0);
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return;
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}
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/* copy data to recv_buf */
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for (int i = 0; i < len; i++) {
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uint32_t next_recv_head = (recv_head + 1) % sizeof(recv_buf);
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if (next_recv_head == recv_tail)
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break; /* overflow */
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recv_buf[recv_head] = usb_buf[i];
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recv_head = next_recv_head;
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}
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/* block flag: flow control closed if not enough free buffer space */
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if (!(rtt_flag_block && recv_set_nak()))
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usbd_ep_nak_set(usbdev, CDCACM_UART_ENDPOINT, 0);
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return;
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}
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/* rtt host to target: read one character */
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int32_t rtt_getchar()
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{
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int retval;
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if (recv_head == recv_tail)
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return -1;
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retval = recv_buf[recv_tail];
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recv_tail = (recv_tail + 1) % sizeof(recv_buf);
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/* open flow control if enough free buffer space */
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if (!recv_set_nak())
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usbd_ep_nak_set(usbdev, CDCACM_UART_ENDPOINT, 0);
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return retval;
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}
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/* rtt host to target: true if no characters available for reading */
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bool rtt_nodata()
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{
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return recv_head == recv_tail;
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}
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/* rtt target to host: write string */
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uint32_t rtt_write(const char *buf, uint32_t len)
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{
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if (len != 0 && usbdev && cdcacm_get_config() && cdcacm_get_dtr()) {
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for (uint32_t p = 0; p < len; p += CDCACM_PACKET_SIZE) {
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uint32_t plen = MIN(CDCACM_PACKET_SIZE, len - p);
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while(usbd_ep_write_packet(usbdev, CDCACM_UART_ENDPOINT, buf + p, plen) <= 0);
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}
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/* flush 64-byte packet on full-speed */
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if (CDCACM_PACKET_SIZE == 64 && (len % CDCACM_PACKET_SIZE) == 0)
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while(usbd_ep_write_packet(usbdev, CDCACM_UART_ENDPOINT, NULL, 0) <= 0);
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}
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return len;
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}
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