initial JTAG scan that occours during platform_init. Previously any fatal errors that occoured during this scan caused a hardfault.
216 lines
5.4 KiB
C
216 lines
5.4 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 the platform specific functions for the STM32
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* implementation.
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*/
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#include "platform.h"
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#include <libopencm3/stm32/f4/rcc.h>
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#include <libopencm3/cm3/systick.h>
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#include <libopencm3/cm3/scb.h>
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/stm32/exti.h>
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#include <libopencm3/stm32/usart.h>
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#include <libopencm3/stm32/syscfg.h>
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#include <libopencm3/usb/usbd.h>
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#include "jtag_scan.h"
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#include <usbuart.h>
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#include <ctype.h>
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uint8_t running_status;
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volatile uint32_t timeout_counter;
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jmp_buf fatal_error_jmpbuf;
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static void morse_update(void);
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int platform_init(void)
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{
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/* Check the USER button*/
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rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPAEN);
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if(gpio_get(GPIOA, GPIO0)) {
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assert_boot_pin();
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scb_reset_core();
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}
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rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_48MHZ]);
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/* Enable peripherals */
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rcc_peripheral_enable_clock(&RCC_AHB2ENR, RCC_AHB2ENR_OTGFSEN);
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rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPCEN);
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rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPDEN);
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rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_CRCEN);
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/* Set up USB Pins and alternate function*/
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gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE,
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GPIO9 | GPIO11 | GPIO12);
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gpio_set_af(GPIOA, GPIO_AF10, GPIO9 | GPIO11 | GPIO12);
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GPIOC_OSPEEDR &=~0xF30;
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GPIOC_OSPEEDR |= 0xA20;
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gpio_mode_setup(JTAG_PORT, GPIO_MODE_OUTPUT,
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GPIO_PUPD_NONE,
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TMS_PIN | TCK_PIN | TDI_PIN);
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gpio_mode_setup(TDO_PORT, GPIO_MODE_INPUT,
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GPIO_PUPD_NONE,
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TDO_PIN);
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gpio_mode_setup(LED_PORT, GPIO_MODE_OUTPUT,
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GPIO_PUPD_NONE,
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LED_UART | LED_IDLE_RUN | LED_ERROR | LED_BOOTLOADER);
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/* Setup heartbeat timer */
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systick_set_clocksource(STK_CSR_CLKSOURCE_AHB_DIV8);
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systick_set_reload(168000000/(10*8)); /* Interrupt us at 10 Hz */
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SCB_SHPR(11) &= ~((15 << 4) & 0xff);
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SCB_SHPR(11) |= ((14 << 4) & 0xff);
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systick_interrupt_enable();
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systick_counter_enable();
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usbuart_init();
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cdcacm_init();
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// Set recovery point
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if (setjmp(fatal_error_jmpbuf)) {
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return 0; // Do nothing on failure
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}
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jtag_scan(NULL);
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return 0;
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}
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void platform_delay(uint32_t delay)
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{
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timeout_counter = delay;
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while(timeout_counter);
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}
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void sys_tick_handler(void)
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{
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if(running_status)
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gpio_toggle(LED_PORT, LED_IDLE_RUN);
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if(timeout_counter)
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timeout_counter--;
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morse_update();
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}
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/* Morse code patterns and lengths */
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static const struct {
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uint16_t code;
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uint8_t bits;
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} morse_letter[] = {
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{ 0b00011101, 8}, // 'A' .-
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{ 0b000101010111, 12}, // 'B' -...
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{ 0b00010111010111, 14}, // 'C' -.-.
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{ 0b0001010111, 10}, // 'D' -..
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{ 0b0001, 4}, // 'E' .
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{ 0b000101110101, 12}, // 'F' ..-.
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{ 0b000101110111, 12}, // 'G' --.
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{ 0b0001010101, 10}, // 'H' ....
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{ 0b000101, 6}, // 'I' ..
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{0b0001110111011101, 16}, // 'J' .---
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{ 0b000111010111, 12}, // 'K' -.-
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{ 0b000101011101, 12}, // 'L' .-..
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{ 0b0001110111, 10}, // 'M' --
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{ 0b00010111, 8}, // 'N' -.
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{ 0b00011101110111, 14}, // 'O' ---
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{ 0b00010111011101, 14}, // 'P' .--.
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{0b0001110101110111, 16}, // 'Q' --.-
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{ 0b0001011101, 10}, // 'R' .-.
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{ 0b00010101, 8}, // 'S' ...
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{ 0b000111, 6}, // 'T' -
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{ 0b0001110101, 10}, // 'U' ..-
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{ 0b000111010101, 12}, // 'V' ...-
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{ 0b000111011101, 12}, // 'W' .--
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{ 0b00011101010111, 14}, // 'X' -..-
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{0b0001110111010111, 16}, // 'Y' -.--
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{ 0b00010101110111, 14}, // 'Z' --..
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};
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const char *morse_msg;
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static const char * volatile morse_ptr;
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static char morse_repeat;
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void morse(const char *msg, char repeat)
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{
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morse_msg = morse_ptr = msg;
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morse_repeat = repeat;
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SET_ERROR_STATE(0);
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}
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static void morse_update(void)
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{
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static uint16_t code;
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static uint8_t bits;
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if(!morse_ptr) return;
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if(!bits) {
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char c = *morse_ptr++;
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if(!c) {
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if(morse_repeat) {
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morse_ptr = morse_msg;
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c = *morse_ptr++;
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} else {
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morse_ptr = 0;
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return;
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}
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}
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if((c >= 'A') && (c <= 'Z')) {
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c -= 'A';
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code = morse_letter[c].code;
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bits = morse_letter[c].bits;
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} else {
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code = 0; bits = 4;
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}
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}
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SET_ERROR_STATE(code & 1);
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code >>= 1; bits--;
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}
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const char *platform_target_voltage(void)
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{
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return "ABSENT!";
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}
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void assert_boot_pin(void)
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{
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/* Assert blue LED as indicator we are in the bootloader */
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rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPDEN);
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gpio_mode_setup(LED_PORT, GPIO_MODE_OUTPUT,
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GPIO_PUPD_NONE, LED_BOOTLOADER);
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gpio_set(LED_PORT, LED_BOOTLOADER);
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/* Jump to the built in bootloader by mapping System flash */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_SYSCFGEN);
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SYSCFG_MEMRM &= ~3;
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SYSCFG_MEMRM |= 1;
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}
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