/*
 * This file is part of the DS18 project.
 * Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
 *
 * 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/>.
 */

#include "hardware.h"

static inline void gpio_setup(){
    // Enable clocks to the GPIO subsystems (PB for ADC), turn on AFIO clocking to disable SWD/JTAG
    RCC->APB2ENR |= RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPCEN | RCC_APB2ENR_AFIOEN;
    // turn off SWJ/JTAG
//    AFIO->MAPR = AFIO_MAPR_SWJ_CFG_DISABLE;
    AFIO->MAPR = AFIO_MAPR_SWJ_CFG_JTAGDISABLE; // for PA15
    // Set led as opendrain output
    GPIOC->CRH = CRH(13, CNF_ODOUTPUT|MODE_SLOW);
    // USB pullup (PA15) - pushpull output
    GPIOA->CRH = CRH(15, CNF_PPOUTPUT|MODE_SLOW);
}

void hw_setup(){
    gpio_setup();
}

void iwdg_setup(){
    uint32_t tmout = 16000000;
    RCC->CSR |= RCC_CSR_LSION;
    while((RCC->CSR & RCC_CSR_LSIRDY) != RCC_CSR_LSIRDY){if(--tmout == 0) break;} /* (2) */
    IWDG->KR = IWDG_START;
    IWDG->KR = IWDG_WRITE_ACCESS;
    IWDG->PR = IWDG_PR_PR_1;
    IWDG->RLR = 1250;
    tmout = 16000000;
    while(IWDG->SR){if(--tmout == 0) break;}
    IWDG->KR = IWDG_REFRESH;
}
