28 lines
720 B
C++
28 lines
720 B
C++
#include "system.h"
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#include "gpio.h"
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////////////////////////////////////////////////////////////////////////
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static constexpr unsigned ticks = SYSTEM_CORE_CLOCK / 1000u;
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static volatile unsigned counter = 0u;
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extern "C" void SysTick_Handler ()__attribute__((interrupt));
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////////////////////////////////////////////////////////////////////////
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void SysTick_Handler () {
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SysTick.SR = 0u;
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if (counter) counter -= 1u;
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}
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static void delay (const unsigned dly = 200u) {
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counter = dly;
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while (counter);
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}
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int main () {
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GpioClass led (GPIOA, 0);
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SysTick.Config (ticks);
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unsigned pass_cnt = 0u;
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for (;;) {
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delay();
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const bool b = pass_cnt & 1u;
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led << b;
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pass_cnt += 1u;
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}
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return 0;
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}
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