80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
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#include <stdio.h>
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#include <cmath>
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#include <cstdint>
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#include <string>
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#include <string_view>
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#include "pico/stdlib.h"
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#include "hardware/vreg.h"
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#include "common/pimoroni_common.hpp"
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#include "hub75.hpp"
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#include "font_outline_10x14.hpp"
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using namespace pimoroni;
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// Display size in pixels
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// Should be either 64x64 or 32x32 but perhaps 64x32 an other sizes will work.
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// Note: this example uses only 5 address lines so it's limited to 64 pixel high displays (32*2).
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const uint8_t WIDTH = 64;
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const uint8_t HEIGHT = 64;
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Hub75 hub75(WIDTH, HEIGHT, nullptr, PANEL_GENERIC, true);
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void __isr dma_complete() {
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hub75.dma_complete();
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}
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void scroll_text(std::string_view text, uint y, float t, Pixel color) {
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uint text_length = text.length();
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uint x = uint(t);
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uint letter = uint((x / letter_width) % text_length);
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uint pixel = x % letter_width;
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char c = text.at(letter);
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for (auto s_x = 0u; s_x < WIDTH; s_x++) {
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uint32_t col = font[c - 32][pixel];
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for (auto s_y = 0u; s_y < letter_height; s_y++) {
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// Calculate a bit of wiggle!
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uint o_y = int(sinf((t / 3.0f) + s_x / 30.0f) * 8);
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// Step through the uint32 that represents a single column
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// of the current character, and render pixels for set bits.
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if(col & (1 << s_y)) {
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hub75.set_color(s_x, s_y + y + o_y, color);
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}
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}
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// Advance to the text pixel/character
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pixel++;
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if (pixel == letter_width) {
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pixel = 0;
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letter++;
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if (letter == text_length) letter = 0;
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c = text.at(letter);
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}
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}
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}
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int main() {
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vreg_set_voltage(VREG_VOLTAGE_1_20);
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sleep_us(100);
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set_sys_clock_khz(266000, true);
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hub75.start(dma_complete);
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std::string text = " Hello World! How are you today? ";
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// Basic loop to draw something to the screen.
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// This gets the distance from the middle of the display and uses it to paint a circular colour cycle.
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while (true) {
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hub75.background = hsv_to_rgb(millis() / 10000.0f, 1.0f, 0.5f);
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// Shadow
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scroll_text(text, HEIGHT / 2 - letter_height / 2 + 1, (millis() + 50) / 50.0f, Pixel(0, 0, 0));
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// Text
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scroll_text(text, HEIGHT / 2 - letter_height / 2, millis() / 50.0f, Pixel(255, 255, 255));
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hub75.flip(false); // Flip and clear to the background colour
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sleep_ms(1000 / 60);
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}
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}
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