/* * This file is part of the Black Magic Debug project. * * Copyright (C) 2012 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 . */ #include #include #include #include #include #include #include #include void usbuart_init(void) { #if defined(BLACKMAGIC) /* On mini hardware, UART and SWD share connector pins. * Don't enable UART if we're being debugged. */ if ((platform_hwversion() == 1) && (SCS_DEMCR & SCS_DEMCR_TRCENA)) return; #endif rcc_peripheral_enable_clock(&USBUSART_APB_ENR, USBUSART_CLK_ENABLE); /* UART TX to 'alternate function output push-pull' */ gpio_set_mode(USBUSART_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, USBUSART_TX_PIN); /* Setup UART parameters. */ usart_set_baudrate(USBUSART, 38400); usart_set_databits(USBUSART, 8); usart_set_stopbits(USBUSART, USART_STOPBITS_1); usart_set_mode(USBUSART, USART_MODE_TX_RX); usart_set_parity(USBUSART, USART_PARITY_NONE); usart_set_flow_control(USBUSART, USART_FLOWCONTROL_NONE); /* Finally enable the USART. */ usart_enable(USBUSART); /* Enable interrupts */ USBUSART_CR1 |= USART_CR1_RXNEIE; nvic_set_priority(USBUSART_IRQ, IRQ_PRI_USBUSART); nvic_enable_irq(USBUSART_IRQ); } void usbuart_set_line_coding(struct usb_cdc_line_coding *coding) { usart_set_baudrate(USBUSART, coding->dwDTERate); usart_set_databits(USBUSART, coding->bDataBits); switch(coding->bCharFormat) { case 0: usart_set_stopbits(USBUSART, USART_STOPBITS_1); break; case 1: usart_set_stopbits(USBUSART, USART_STOPBITS_1_5); break; case 2: usart_set_stopbits(USBUSART, USART_STOPBITS_2); break; } switch(coding->bParityType) { case 0: usart_set_parity(USBUSART, USART_PARITY_NONE); break; case 1: usart_set_parity(USBUSART, USART_PARITY_ODD); break; case 2: usart_set_parity(USBUSART, USART_PARITY_EVEN); break; } } void usbuart_usb_out_cb(usbd_device *dev, uint8_t ep) { (void)ep; char buf[CDCACM_PACKET_SIZE]; int len = usbd_ep_read_packet(dev, CDCACM_UART_ENDPOINT, buf, CDCACM_PACKET_SIZE); #if defined(BLACKMAGIC) /* Don't bother if uart is disabled. * This will be the case on mini while we're being debugged. */ if(!(RCC_APB2ENR & RCC_APB2ENR_USART1EN)) return; #endif gpio_set(LED_PORT_UART, LED_UART); for(int i = 0; i < len; i++) usart_send_blocking(USBUSART, buf[i]); gpio_clear(LED_PORT_UART, LED_UART); } static uint8_t uart_usb_buf[CDCACM_PACKET_SIZE]; static uint8_t uart_usb_buf_size; void usbuart_usb_in_cb(usbd_device *dev, uint8_t ep) { if (!uart_usb_buf_size) { gpio_clear(LED_PORT_UART, LED_UART); return; } usbd_ep_write_packet(dev, ep, uart_usb_buf, uart_usb_buf_size); uart_usb_buf_size = 0; } void USBUSART_ISR(void) { char c = usart_recv(USBUSART); gpio_set(LED_PORT_UART, LED_UART); /* Try to send now */ if (usbd_ep_write_packet(usbdev, CDCACM_UART_ENDPOINT, &c, 1) == 1) return; /* We failed, so queue for later */ if (uart_usb_buf_size == CDCACM_PACKET_SIZE) { /* Drop if the buffer's full: we have no flow control */ return; } uart_usb_buf[uart_usb_buf_size++] = c; }