/* * This file is part of the Black Magic Debug project. * * Copyright (C) 2013 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 "usbdfu.h" static uint8_t rev; static uint16_t led_idle_run; static uint32_t led2_state = 0; uint32_t app_address = 0x08002000; static int stlink_test_nrst(void) { /* Test if JRST/NRST is pulled down*/ uint16_t nrst; uint16_t pin; uint32_t systick_value; systick_set_clocksource(STK_CSR_CLKSOURCE_AHB_DIV8); systick_set_reload(0xffffff); /* no underflow for about 16.7 seconds*/ systick_counter_enable(); /* systick ist now running with 1 MHz, systick counts down */ /* First, get Board revision by pulling PC13/14 up. Read * 11 for ST-Link V1, e.g. on VL Discovery, tag as rev 0 * 10 for ST-Link V2, e.g. on F4 Discovery, tag as rev 1 */ rcc_periph_clock_enable(RCC_GPIOC); gpio_set_mode(GPIOC, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO14 | GPIO13); gpio_set(GPIOC, GPIO14 | GPIO13); systick_value = systick_get_value(); while (systick_get_value() > (systick_value - 1000)); /* Wait 1 msec*/ rev = (~(gpio_get(GPIOC, GPIO14 | GPIO13)) >> 13) & 3; switch (rev) { case 0: pin = GPIO1; led_idle_run = GPIO8; break; default: pin = GPIO0; led_idle_run = GPIO9; } gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, led_idle_run); rcc_periph_clock_enable(RCC_GPIOB); gpio_set_mode(GPIOB, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, pin); gpio_set(GPIOB, pin); systick_value = systick_get_value(); while (systick_get_value() > (systick_value - 20000)); /* Wait 20 msec*/ nrst = gpio_get(GPIOB, pin); systick_counter_disable(); return (nrst) ? 1 : 0; } void dfu_detach(void) { /* Disconnect USB cable by resetting USB Device and pulling USB_DP low*/ rcc_periph_reset_pulse(RST_USB); rcc_periph_clock_enable(RCC_USB); rcc_periph_clock_enable(RCC_GPIOA); gpio_clear(GPIOA, GPIO12); gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO12); scb_reset_system(); } int main(void) { /* Check the force bootloader pin*/ rcc_periph_clock_enable(RCC_GPIOA); /* Check value of GPIOA1 configuration. This pin is unconnected on * STLink V1 and V2. If we have a value other than the reset value (0x4), * we have a warm start and request Bootloader entry */ if(((GPIOA_CRL & 0x40) == 0x40) && stlink_test_nrst()) dfu_jump_app_if_valid(); dfu_protect(DFU_MODE); rcc_clock_setup_in_hse_8mhz_out_72mhz(); systick_set_clocksource(STK_CSR_CLKSOURCE_AHB_DIV8); systick_set_reload(900000); /* Handle USB disconnect/connect */ /* Just in case: Disconnect USB cable by resetting USB Device * and pulling USB_DP low * Device will reconnect automatically as Pull-Up is hard wired*/ rcc_periph_reset_pulse(RST_USB); rcc_periph_clock_enable(RCC_USB); rcc_periph_clock_enable(RCC_GPIOA); gpio_clear(GPIOA, GPIO12); gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO12); systick_interrupt_enable(); systick_counter_enable(); dfu_init(&stm32f103_usb_driver, DFU_MODE); dfu_main(); } void sys_tick_handler(void) { if (rev == 0) { gpio_toggle(GPIOA, led_idle_run); } else { if (led2_state & 1) { gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, led_idle_run); } else { gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_ANALOG, led_idle_run); } led2_state++; } }