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56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/*
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* My first project
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*
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* It blinks LEDs like counting in binary, when the button is pressed, it reverses the order
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*
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* Build on top of libopenocm3, blackbox parts of code (setup()) copied from
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* libopencm3-examples/examples/stm32/f1/stm32vl-discovery/button project
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*
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* Open source licence, let's say Artistic Licence, although it doesn't matter, as it is local only
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*/
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <stdbool.h>
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#define DELAY 8000000 // Should be a second, or maybe not (second iff 8MHz clk, 1/3second if 24MHz clk)
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#define STM32F1 1 // Needed for libopencm3
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void setup (void) { // All the blackbox code
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rcc_clock_setup_in_hse_8mhz_out_24mhz();
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rcc_periph_clock_enable(RCC_GPIOC);
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rcc_periph_clock_enable(RCC_GPIOA);
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO8 | GPIO9);
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gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO0);
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}
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void inline wait (int ticks) { // This works in libopenocm3 examples
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int i;
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for (i=0;i<ticks;i++) __asm__("nop");
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return;
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}
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int main (void) {
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setup();
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// Array of what leds should be on
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uint16_t states[4] = {0, GPIO9, GPIO8, GPIO9 | GPIO8};
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enum {FORWARD, BACKWARD} direction = FORWARD;
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bool pressed = false;
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char state;
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while (true) {
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if (/*Button pressed, but was not*/ gpio_get(GPIOA, GPIO0) && (pressed == false) ) {
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pressed = true;
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direction = (direction == FORWARD ? BACKWARD : FORWARD); // Switch direction
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} else /*Button not pressed, possibly released*/ {
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pressed = false;
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}
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state = (direction == FORWARD ? (state + 1)%4 : (/*state+4-1*/ state+3)%4 );
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gpio_set(GPIOC, states[state]);
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wait(DELAY);
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}
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return 0;
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}
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