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path: root/src/platforms/swlink/platform.c
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/*
 * This file is part of the Black Magic Debug project.
 *
 * Copyright (C) 2011  Black Sphere Technologies Ltd.
 * Written by Gareth McMullin <gareth@blacksphere.co.nz>
 *
 * 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 <http://www.gnu.org/licenses/>.
 */

/* This file implements the platform specific functions for the ST-Link
 * implementation.
 */

#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/cm3/systick.h>
#include <libopencm3/cm3/scb.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/stm32/usart.h>
#include <libopencm3/usb/usbd.h>
#include <libopencm3/stm32/f1/adc.h>

#include "platform.h"
#include "jtag_scan.h"
#include <usbuart.h>

#include <ctype.h>

uint8_t running_status;
volatile uint32_t timeout_counter;

jmp_buf fatal_error_jmpbuf;

int platform_init(void)
{
	uint32_t data;
	rcc_clock_setup_in_hse_8mhz_out_72mhz();

	/* Enable peripherals */
	rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USBEN);
	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN);

	/* Unmap JTAG Pins so we can reuse as GPIO */
        data = AFIO_MAPR;
        data &= ~AFIO_MAPR_SWJ_MASK;
        data |= AFIO_MAPR_SWJ_CFG_JTAG_OFF_SW_OFF;
        AFIO_MAPR = data;
	/* Setup JTAG GPIO ports */
	gpio_set_mode(TMS_PORT, GPIO_MODE_OUTPUT_10_MHZ,
			GPIO_CNF_OUTPUT_PUSHPULL, TMS_PIN);
	gpio_set_mode(TCK_PORT, GPIO_MODE_OUTPUT_10_MHZ,
			GPIO_CNF_OUTPUT_PUSHPULL, TCK_PIN);
	gpio_set_mode(TDI_PORT, GPIO_MODE_OUTPUT_10_MHZ,
			GPIO_CNF_OUTPUT_PUSHPULL, TDI_PIN);

	gpio_set_mode(TDO_PORT, GPIO_MODE_INPUT,
			GPIO_CNF_INPUT_FLOAT, TDO_PIN);

        gpio_set(NRST_PORT,NRST_PIN);
	gpio_set_mode(NRST_PORT, GPIO_MODE_INPUT,
			GPIO_CNF_INPUT_PULL_UPDOWN, NRST_PIN);

	gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ,
			GPIO_CNF_OUTPUT_PUSHPULL, led_idle_run);

        /* Remap TIM2 TIM2_REMAP[1]
         * TIM2_CH1_ETR -> PA15 (TDI, set as output above)
         * TIM2_CH2     -> PB3  (TDO)
         */
        data = AFIO_MAPR;
        data &= ~AFIO_MAPR_TIM2_REMAP_FULL_REMAP;
        data |=  AFIO_MAPR_TIM2_REMAP_PARTIAL_REMAP1;
        AFIO_MAPR = data;

	/* Setup heartbeat timer */
	systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8); 
	systick_set_reload(900000);	/* Interrupt us at 10 Hz */
	SCB_SHPR(11) &= ~((15 << 4) & 0xff);
	SCB_SHPR(11) |= ((14 << 4) & 0xff);
	systick_interrupt_enable();
	systick_counter_enable();

	usbuart_init();

	SCB_VTOR = 0x2000;	// Relocate interrupt vector table here

	cdcacm_init();

	jtag_scan(NULL);

	return 0;
}

void platform_delay(uint32_t delay)
{
	timeout_counter = delay;
	while(timeout_counter);
}

void sys_tick_handler(void)
{
	if(running_status) 
		gpio_toggle(LED_PORT, led_idle_run);

	if(timeout_counter) 
		timeout_counter--;
}

const char *morse_msg;

void morse(const char *msg, char repeat)
{
	(void)repeat;
	morse_msg = msg;
}

const char *platform_target_voltage(void)
{
	return "unknown";
}

void disconnect_usb(void)
{
	/* Disconnect USB cable by resetting USB Device and pulling USB_DP low*/
	rcc_peripheral_reset(&RCC_APB1RSTR, RCC_APB1ENR_USBEN);
	rcc_peripheral_clear_reset(&RCC_APB1RSTR, RCC_APB1ENR_USBEN);
	rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USBEN);
	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
	gpio_clear(GPIOA, GPIO12);
	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
		GPIO_CNF_OUTPUT_OPENDRAIN, GPIO12);
}

void assert_boot_pin(void)
{
	uint32_t crl = GPIOA_CRL;
	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
	/* Enable Pull on GPIOA1. We don't rely on the external pin
	 * really pulled, but only on the value of the CNF register
	 * changed from the reset value
	 */
	crl &= 0xffffff0f;
	crl |= 0x80;
	GPIOA_CRL = crl;
}
void setup_vbus_irq(void){};