| 1 | #if defined(ARDUINO_ARCH_RP2040) // RP2040 specific driver |
| 2 | |
| 3 | #include "Adafruit_NeoPixel.h" |
| 4 | |
| 5 | bool Adafruit_NeoPixel::rp2040claimPIO(void) { |
| 6 | // Find a PIO with enough available space in its instruction memory |
| 7 | pio = NULL; |
| 8 | |
| 9 | if (!pio_claim_free_sm_and_add_program_for_gpio_range( |
| 10 | &ws2812_program, &pio, &pio_sm, &pio_program_offset, pin, 1, |
| 11 | true)) { |
| 12 | pio = NULL; |
| 13 | pio_sm = -1; |
| 14 | pio_program_offset = 0; |
| 15 | return false; // No PIO available |
| 16 | } |
| 17 | |
| 18 | // yay ok! |
| 19 | |
| 20 | if (is800KHz) { |
| 21 | // 800kHz, 8 bit transfers |
| 22 | ws2812_program_init(pio, pio_sm, pio_program_offset, pin, 800000, 8); |
| 23 | } else { |
| 24 | // 400kHz, 8 bit transfers |
| 25 | ws2812_program_init(pio, pio_sm, pio_program_offset, pin, 400000, 8); |
| 26 | } |
| 27 | |
| 28 | return true; |
| 29 | } |
| 30 | |
| 31 | void Adafruit_NeoPixel::rp2040releasePIO(void) { |
| 32 | if (pio == NULL) |
| 33 | return; |
| 34 | |
| 35 | pio_remove_program_and_unclaim_sm(&ws2812_program, pio, pio_sm, |
| 36 | pio_program_offset); |
| 37 | } |
| 38 | |
| 39 | // Private, called from show() |
| 40 | void Adafruit_NeoPixel::rp2040Show(uint8_t *pixels, uint32_t numBytes) { |
| 41 | // verify we have a valid PIO and state machine |
| 42 | if (!pio || (pio_sm < 0)) { |
| 43 | return; |
| 44 | } |
| 45 | |
| 46 | while (numBytes--) |
| 47 | // Bits for transmission must be shifted to top 8 bits |
| 48 | pio_sm_put_blocking(pio, pio_sm, ((uint32_t)*pixels++) << 24); |
| 49 | } |
| 50 | #endif |