142 lines
3.7 KiB
C
142 lines
3.7 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) 2012 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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#include <libopencm3/stm32/f1/rcc.h>
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#include <libopencm3/stm32/f1/gpio.h>
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#include <libopencm3/stm32/usart.h>
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/cm3/scs.h>
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#include <libopencm3/usb/usbd.h>
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#include <libopencm3/usb/cdc.h>
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#include "platform.h"
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void usbuart_init(void)
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{
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/* On mini hardware, UART and SWD share connector pins.
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* Don't enable UART if we're being debugged. */
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if ((platform_hwversion() == 1) && (SCS_DEMCR & SCS_DEMCR_TRCENA))
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return;
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_USART1EN);
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/* UART1 TX to 'alternate function output push-pull' */
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO9);
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/* Setup UART parameters. */
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usart_set_baudrate(USART1, 38400);
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usart_set_databits(USART1, 8);
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usart_set_stopbits(USART1, USART_STOPBITS_1);
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usart_set_mode(USART1, USART_MODE_TX_RX);
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usart_set_parity(USART1, USART_PARITY_NONE);
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usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART1);
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/* Enable interrupts */
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USART1_CR1 |= USART_CR1_RXNEIE;
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nvic_set_priority(NVIC_USART1_IRQ, IRQ_PRI_USART1);
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nvic_enable_irq(NVIC_USART1_IRQ);
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}
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void usbuart_set_line_coding(struct usb_cdc_line_coding *coding)
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{
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usart_set_baudrate(USART1, coding->dwDTERate);
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usart_set_databits(USART1, coding->bDataBits);
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switch(coding->bCharFormat) {
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case 0:
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usart_set_stopbits(USART1, USART_STOPBITS_1);
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break;
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case 1:
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usart_set_stopbits(USART1, USART_STOPBITS_1_5);
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break;
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case 2:
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usart_set_stopbits(USART1, USART_STOPBITS_2);
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break;
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}
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switch(coding->bParityType) {
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case 0:
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usart_set_parity(USART1, USART_PARITY_NONE);
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break;
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case 1:
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usart_set_parity(USART1, USART_PARITY_ODD);
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break;
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case 2:
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usart_set_parity(USART1, USART_PARITY_EVEN);
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break;
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}
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}
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void usbuart_usb_out_cb(usbd_device *dev, uint8_t ep)
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{
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(void)ep;
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char buf[CDCACM_PACKET_SIZE];
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int len = usbd_ep_read_packet(dev, CDCACM_UART_ENDPOINT,
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buf, CDCACM_PACKET_SIZE);
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/* Don't bother if uart is disabled.
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* This will be the case on mini while we're being debugged.
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*/
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if(!(RCC_APB2ENR & RCC_APB2ENR_USART1EN))
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return;
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gpio_set(LED_PORT, LED_UART);
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for(int i = 0; i < len; i++)
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usart_send_blocking(USART1, buf[i]);
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gpio_clear(LED_PORT, LED_UART);
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}
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static uint8_t uart_usb_buf[CDCACM_PACKET_SIZE];
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static uint8_t uart_usb_buf_size;
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void usbuart_usb_in_cb(usbd_device *dev, uint8_t ep)
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{
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if (!uart_usb_buf_size) {
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gpio_clear(LED_PORT, LED_UART);
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return;
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}
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usbd_ep_write_packet(dev, ep, uart_usb_buf, uart_usb_buf_size);
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uart_usb_buf_size = 0;
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}
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void usart1_isr(void)
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{
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char c = usart_recv(USART1);
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gpio_set(LED_PORT, LED_UART);
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/* Try to send now */
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if (usbd_ep_write_packet(usbdev, CDCACM_UART_ENDPOINT, &c, 1) == 1)
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return;
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/* We failed, so queue for later */
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if (uart_usb_buf_size == CDCACM_PACKET_SIZE) {
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/* Drop if the buffer's full: we have no flow control */
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return;
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}
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uart_usb_buf[uart_usb_buf_size++] = c;
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}
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