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    #include <pico/stdlib.h>
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    #include <hardware/i2c.h>
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    #include <stdio.h>
#include <unistd.h>
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    const uint8_t init[4] = {0x21, 0xa0, 0xe1, 0x81};
const uint8_t zeile[8] = {0x00, 0x02, 0x04, 0x06, 0x08, 0x10, 0x12, 0x14};
const uint8_t fill[17] = {0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
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    const uint8_t empty[17] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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    // erste byte: bei welche zeile es anfängt
// 0x00 => data address pointer command begins with 0000, second half modifies command to tell which line it is
/*
lines go from 0 - 15 => nimm alle gerade (0, 2, 4, 6, 8, 10, 12, 14), (1, 3, 5, 7, 9, 11, 13, 15)
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    so every other byte is egal

0xff == every led in row lights up (all 8 bits are lit up)

*/
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    const uint8_t matrix[9][17] = {
    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // empty
    {0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // achtel
    {0x00, 0xff, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // viertel
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // dreiachtel
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // hälfte
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // fünfachtel
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00}, // dreiviertel
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0x00, 0x00}, // siebenachtel
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00}, // ganzes
};
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    const uint8_t better_matrix[65][17] = {
    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},

    {0x00, 0b00000001, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0b00000011, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0b00000111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0b00001111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0b00011111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0b00111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0b01111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0b11111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},

    {0x00, 0xff, 0x00, 0b00000001, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0b00000011, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0b00000111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0b00001111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0b00011111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0b00111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0b01111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0b11111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},

    {0x00, 0xff, 0x00, 0xff, 0x00, 0b00000001, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0b00000011, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0b00000111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0b00001111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0b00011111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0b00111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0b01111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0b11111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},

    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000001, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000011, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00001111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00011111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b01111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b11111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},

    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000001, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000011, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00001111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00011111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b01111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b11111111, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},

    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000001, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000011, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000111, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00001111, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00011111, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00111111, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b01111111, 0x00, 0x00, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b11111111, 0x00, 0x00, 0x00, 0x00, 0x00},

    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000001, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000011, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000111, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00001111, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00011111, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00111111, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b01111111, 0x00, 0x00, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b11111111, 0x00, 0x00, 0x00},

    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000001, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000011, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00000111, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00001111, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00011111, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b00111111, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b01111111, 0x00},
    {0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0xff, 0x00, 0b11111111, 0x00},
};
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    int main()
{
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        // clock enable: 100000 baud (bit/s)
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        i2c_init(i2c_default, 100000);
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        // Pin 0 and 1 are given I2C functionality (they're the ones connected to the led matrix)
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        gpio_set_function(0, GPIO_FUNC_I2C);
    gpio_set_function(1, GPIO_FUNC_I2C);
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        // refer to page 439 in RP2040, redundant with write_blocking - pins are used as output (write enable) (sort of)
    // gpio_pull_up(1);
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        // gpio_pull_up(0); // sets to 3.3 / 5 V, i2c sets it to 0
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    // 0x70 i2c address for 28 pin (refer to matrix.pdf page 21)
    // can't be directly written cuz we need pointers
    // system setup (clock enable), ROW/INT set, dimming, display setup
    // const uint8_t init[4] = {0x21, 0xa0, 0xe1, 0x81};
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        i2c_write_blocking(i2c_default, 0x70, &init[0], 1, false);
    i2c_write_blocking(i2c_default, 0x70, &init[1], 1, false);
    i2c_write_blocking(i2c_default, 0x70, &init[2], 1, false);
    i2c_write_blocking(i2c_default, 0x70, &init[3], 1, false);
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        i2c_write_blocking(i2c_default, 0x70, zeile, 4, false);
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        i2c_write_blocking(i2c_default, 0x70, empty, 17, false);
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        for (int i = 0; i <= 64; i++)
    {
        i2c_write_blocking(i2c_default, 0x70, better_matrix[i], 17, false);

        // sleep
        for (int j = 0; j < 1000000; j++)
        {
            volatile int i = 0;
        }
    }

    for (int i = 64; i >= 0; i--)
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        {
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            i2c_write_blocking(i2c_default, 0x70, better_matrix[i], 17, false);
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            // sleep
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            for (int j = 0; j < 1000000; j++)
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            {
            volatile int i = 0;
        }
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        }
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        return 0;
}