main.c

//******************************************************************************
//
// Copyright (c) 2019, Vitaliy Dudnik <masterv.play@gmail.com>
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//   1. Redistributions of source code must retain the above copyright notice,
//      this list of conditions and the following disclaimer.
//   2. Redistributions in binary form must reproduce the above copyright notice,
//      this list of conditions and the following disclaimer in the documentation
//      and/or other materials provided with the distribution.
//   3. Neither the name of copyright holder nor the names of its contributors
//      may be used to endorse or promote products derived from this software
//      without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//******************************************************************************

#include <system.h>
#include <mgmt/sys_mgr.h>

static
void hw_init()
{
	NVIC_SetPriorityGrouping(0x03);

	LL_FLASH_SetLatency(LL_FLASH_LATENCY_0);

	LL_RCC_HSI_SetCalibTrimming(16);

	LL_RCC_HSI_Enable();
	while(LL_RCC_HSI_IsReady() != 1);

	LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
	LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
	LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
	LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_HSI);

	while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_HSI);

	LL_SYSTICK_SetClkSource(LL_SYSTICK_CLKSOURCE_HCLK);

	LL_SetSystemCoreClock(8000000);
}

static
void wdt_enable()
{
	LL_IWDG_Enable(IWDG);
	LL_IWDG_EnableWriteAccess(IWDG);
	LL_IWDG_SetPrescaler(IWDG, LL_IWDG_PRESCALER_64);
	LL_IWDG_SetReloadCounter(IWDG, 2500);
	while(!LL_IWDG_IsReady(IWDG));
}

static
void wdt_reset()
{
	LL_IWDG_ReloadCounter(IWDG);
}

void main()
{
	hw_init();
	sys_mgr_init();
	wdt_enable();

	for(;;)
	{
		wdt_reset();
		pt_schedule(0);
	}
}