58 lines
1.4 KiB
C++
58 lines
1.4 KiB
C++
#include <math.h>
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#include "breakout_dotmatrix.hpp"
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#include "time.h"
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using namespace pimoroni;
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I2C i2c(BOARD::BREAKOUT_GARDEN);
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BreakoutDotMatrix display(&i2c);
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static const uint8_t WIDTH = display.WIDTH;
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static const uint8_t HEIGHT = display.HEIGHT;
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static const uint8_t HALF_WIDTH = (WIDTH / 2);
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uint8_t values[HALF_WIDTH] = { 0, 0, 0, 0, 0 };
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uint8_t next_value = 0;
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int main() {
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gpio_init(PICO_DEFAULT_LED_PIN);
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gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
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display.init();
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while(true) {
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gpio_put(PICO_DEFAULT_LED_PIN, true);
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absolute_time_t at = get_absolute_time();
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uint64_t t = to_us_since_boot(at) / 1000000;
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// Add a new random value to our array, overriding the oldest value
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values[next_value] = rand() % HEIGHT;
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next_value = (next_value + 1) % HALF_WIDTH;
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// Animate a value from 0 to height + 1
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float value = (sinf(t * M_PI) + 1) / 2.0f;
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value *= HEIGHT + 1;
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value = floor(value);
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for(uint8_t y = 0; y < HEIGHT; y++) {
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uint8_t y_inv = HEIGHT - 1 - y;
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for(uint8_t x = 0; x < HALF_WIDTH; x++) {
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// Left
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display.set_pixel(x, y_inv, value <= y_inv);
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// Right
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display.set_pixel(x + HALF_WIDTH, y_inv, values[(x + next_value) % HALF_WIDTH] <= y_inv);
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}
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}
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display.show();
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gpio_put(PICO_DEFAULT_LED_PIN, false);
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sleep_ms(1000 / HEIGHT);
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}
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return 0;
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} |