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53 lines
1.2 KiB
53 lines
1.2 KiB
// This sketch is based on the SDK example here:
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// https://github.com/raspberrypi/pico-examples/tree/master/pio/ws2812
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/**
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Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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SPDX-License-Identifier: BSD-3-Clause
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*/
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#if defined(ARDUINO_ARCH_RP2040)
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#include <stdlib.h>
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#include "hardware/pio.h"
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#include "hardware/clocks.h"
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#include "rp2040_pio.h"
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void rp2040Init(uint8_t pin, bool is800KHz)
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{
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// todo get free sm
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PIO pio = pio0;
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int sm = 0;
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uint offset = pio_add_program(pio, &ws2812_program);
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if (is800KHz)
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{
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// 800kHz, 8 bit transfers
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ws2812_program_init(pio, sm, offset, pin, 800000, 8);
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}
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else
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{
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// 400kHz, 8 bit transfers
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ws2812_program_init(pio, sm, offset, pin, 400000, 8);
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}
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}
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void rp2040Show(uint8_t pin, uint8_t *pixels, uint32_t numBytes, bool is800KHz)
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{
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static bool init = true;
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if (init)
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{
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// On first pass through initialise the PIO
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rp2040Init(pin, is800KHz);
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init = false;
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}
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while(numBytes--)
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// Bits for transmission must be shifted to top 8 bits
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pio_sm_put_blocking(pio0, 0, ((uint32_t)*pixels++)<< 24);
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}
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#endif // KENDRYTE_K210
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