83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
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//
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// This file is part of the GNU ARM Eclipse distribution.
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// Copyright (c) 2014 Liviu Ionescu.
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//
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// ----------------------------------------------------------------------------
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#include <stdio.h>
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#include <stdlib.h>
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#include "diag/Trace.h"
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#include "Timer.h"
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#include "BlinkLed.h"
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// ----------------------------------------------------------------------------
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//
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// Standalone STM32F4 led blink sample (trace via DEBUG).
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//
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// In debug configurations, demonstrate how to print a greeting message
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// on the trace device. In release configurations the message is
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// simply discarded.
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//
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// Then demonstrates how to blink a led with 1 Hz, using a
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// continuous loop and SysTick delays.
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//
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// Trace support is enabled by adding the TRACE macro definition.
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// By default the trace messages are forwarded to the DEBUG output,
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// but can be rerouted to any device or completely suppressed, by
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// changing the definitions required in system/src/diag/trace_impl.c
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// (currently OS_USE_TRACE_ITM, OS_USE_TRACE_SEMIHOSTING_DEBUG/_STDOUT).
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//
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// ----- Timing definitions -------------------------------------------------
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// Keep the LED on for 2/3 of a second.
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#define BLINK_ON_TICKS (TIMER_FREQUENCY_HZ * 3 / 4)
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#define BLINK_OFF_TICKS (TIMER_FREQUENCY_HZ - BLINK_ON_TICKS)
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// ----- main() ---------------------------------------------------------------
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// Sample pragmas to cope with warnings. Please note the related line at
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// the end of this function, used to pop the compiler diagnostics status.
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wunused-parameter"
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#pragma GCC diagnostic ignored "-Wmissing-declarations"
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#pragma GCC diagnostic ignored "-Wreturn-type"
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int
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main(int argc, char* argv[])
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{
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// Send a greeting to the trace device (skipped on Release).
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trace_puts("Hello ARM World!");
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// At this stage the system clock should have already been configured
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// at high speed.
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trace_printf("System clock: %u Hz\n", SystemCoreClock);
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timer_start();
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blink_led_init();
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uint32_t seconds = 0;
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// Infinite loop
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while (1)
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{
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blink_led_on();
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timer_sleep(seconds == 0 ? TIMER_FREQUENCY_HZ : BLINK_ON_TICKS);
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blink_led_off();
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timer_sleep(BLINK_OFF_TICKS);
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++seconds;
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// Count seconds on the trace device.
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trace_printf("Second %u\n", seconds);
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}
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// Infinite loop, never return.
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}
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#pragma GCC diagnostic pop
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// ----------------------------------------------------------------------------
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