46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
#include <stdio.h>
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#include "hardware/gpio.h"
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#include "pico/stdlib.h"
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#include "pico/binary_info.h"
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const uint PIN_DIGIT_BASE = 18;
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const uint PIN_SEGMENT_BASE = 2;
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const uint N_DIGITS = 4;
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uint8_t digit_states[4] = { 0b11001100, 0b11111111, 0b10101010, 0b00101001 };
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void write_digit(uint8_t digit) {
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const uint mask = (0xffffffff << PIN_SEGMENT_BASE) ^ (0xffffffff << PIN_SEGMENT_BASE + 8);
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gpio_put_masked(mask, (~digit & 0xff) << PIN_SEGMENT_BASE);
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gpio_put_masked(mask, digit << PIN_SEGMENT_BASE);
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}
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int main() {
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bi_decl(bi_program_description("qCLK driver."));
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stdio_init_all();
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for (uint i = PIN_DIGIT_BASE; i < PIN_DIGIT_BASE + N_DIGITS; i++) {
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gpio_init(i);
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gpio_set_dir(i, GPIO_OUT);
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gpio_put(i, 0);
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}
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for (uint i = PIN_SEGMENT_BASE; i < PIN_SEGMENT_BASE + 8; i++) {
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gpio_init(i);
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gpio_set_dir(i, GPIO_OUT);
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}
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write_digit(0);
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while (1) {
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for (uint i = 0; i < N_DIGITS; i++) {
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uint prev = i == 0 ? N_DIGITS - 1 : i - 1;
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gpio_put(PIN_DIGIT_BASE + prev, 0);
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write_digit(digit_states[i]);
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gpio_put(PIN_DIGIT_BASE + i, 1);
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sleep_ms(1);
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}
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}
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}
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