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#include <stdio.h>
//#if (__cplusplus < 201103L)
extern "C"
{
//#endif
#include "Board_LED.h" // ::Board Support:LED
#include "Board_Buttons.h" // ::Board Support:Buttons
//#if (__cplusplus < 201103L)
}
//#endif
#include "stm32f4xx.h" // Device header
#include "etl/function.h"
#include "etl/callback_timer.h"
#include "etl/vector.h"
#include "etl/iterator.h"
#include "etl/binary.h"
struct FP
{
void (*function)();
};
static etl::vector<FP, 10> power_callbacks;
void register_poweroff_callback(void (*function)())
{
FP fp = { function };
power_callbacks.push_back(fp);
}
const int N_TIMERS = 4;
etl::callback_timer<N_TIMERS> callback_timer;
etl::timer::id::type short_toggle;
etl::timer::id::type long_toggle;
etl::timer::id::type start_timers;
etl::timer::id::type swap_timers;
/*----------------------------------------------------------------------------
* SystemCoreClockConfigure: configure SystemCoreClock using HSI
(HSE is not populated on Nucleo board)
*----------------------------------------------------------------------------*/
void SystemCoreClockConfigure(void) {
RCC->CR |= ((uint32_t)RCC_CR_HSION); // Enable HSI
while ((RCC->CR & RCC_CR_HSIRDY) == 0); // Wait for HSI Ready
RCC->CFGR = RCC_CFGR_SW_HSI; // HSI is system clock
while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_HSI); // Wait for HSI used as system clock
FLASH->ACR = FLASH_ACR_PRFTEN; // Enable Prefetch Buffer
FLASH->ACR |= FLASH_ACR_ICEN; // Instruction cache enable
FLASH->ACR |= FLASH_ACR_DCEN; // Data cache enable
FLASH->ACR |= FLASH_ACR_LATENCY_5WS; // Flash 5 wait state
RCC->CFGR |= RCC_CFGR_HPRE_DIV1; // HCLK = SYSCLK
RCC->CFGR |= RCC_CFGR_PPRE1_DIV4; // APB1 = HCLK/4
RCC->CFGR |= RCC_CFGR_PPRE2_DIV2; // APB2 = HCLK/2
RCC->CR &= ~RCC_CR_PLLON; // Disable PLL
// PLL configuration: VCO = HSI/M * N, Sysclk = VCO/P
RCC->PLLCFGR = ( 16ul | // PLL_M = 16
(384ul << 6U) | // PLL_N = 384
( 3ul << 16U) | // PLL_P = 8
(RCC_PLLCFGR_PLLSRC_HSI) | // PLL_SRC = HSI
( 8ul << 24U) ); // PLL_Q = 8
RCC->CR |= RCC_CR_PLLON; // Enable PLL
while((RCC->CR & RCC_CR_PLLRDY) == 0) __NOP(); // Wait till PLL is ready
RCC->CFGR &= ~RCC_CFGR_SW; // Select PLL as system clock source
RCC->CFGR |= RCC_CFGR_SW_PLL;
while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_PLL); // Wait till PLL is system clock src
}
void StartTimers()
{
callback_timer.start(short_toggle);
callback_timer.start(swap_timers);
}
void SwapTimers()
{
static bool state = false;
if (!state)
{
callback_timer.stop(short_toggle);
callback_timer.start(long_toggle);
}
else
{
callback_timer.start(short_toggle);
callback_timer.stop(long_toggle);
}
state = !state;
callback_timer.start(swap_timers);
}
void LedToggle()
{
static bool state = false;
if (state)
{
LED_On(0);
}
else
{
LED_Off(0);
}
state = !state;
}
int main()
{
SystemCoreClockConfigure(); // configure HSI as System Clock
SystemCoreClockUpdate();
LED_Initialize();
Buttons_Initialize();
// The LEDs will start flashing fast after 2 seconds.
// After another 5 seconds they will start flashing slower.
short_toggle = callback_timer.register_timer(LedToggle, 50, etl::timer::mode::REPEATING);
long_toggle = callback_timer.register_timer(LedToggle, 100, etl::timer::mode::REPEATING);
start_timers = callback_timer.register_timer(StartTimers, 2000, etl::timer::mode::SINGLE_SHOT);
swap_timers = callback_timer.register_timer(SwapTimers, 1500, etl::timer::mode::SINGLE_SHOT);
SysTick_Config(SystemCoreClock / 1000);
callback_timer.enable(true);
callback_timer.start(start_timers);
while (true)
{
__NOP();
}
}
extern "C"
{
void SysTick_Handler()
{
const uint32_t TICK = 1U;
static uint32_t nticks = TICK;
if (callback_timer.tick(nticks))
{
nticks = TICK;
}
else
{
nticks += TICK;
}
}
}
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