97 lines
2.6 KiB
C++
97 lines
2.6 KiB
C++
#include "pxt.h"
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#if MICROBIT_CODAL
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// WS2812B timings, datasheet v1
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// 0 - 0.25-0.55us hi 0.70-1.00us low
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// 1 - 0.65-0.95us hi 0.30-0.60us low
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// datasheet v5
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// 0 - 0.22-0.38us hi 0.58-1.00us low
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// 1 - 0.58-1.00us hi 0.58-1.00us low
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// nrf52 asm timings:
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// 0 0.34 - 0.78
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// 1 0.80 - 0.59
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extern "C" void __attribute__((long_call, section(".data")))
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neopixel_send_buffer_nrf52(void *port500, uint32_t pinbr, const uint8_t *ptr, int numBytes);
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__attribute__((noinline)) static void
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neopixel_send_buffer_brightness(DevicePin &pin, const uint8_t *ptr, int numBytes, uint32_t br) {
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if (br > 0x100)
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br = 0x100;
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pin.setDigitalValue(0);
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target_wait_us(300); // initial reset
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auto port = pin.name < 32 ? NRF_P0 : NRF_P1;
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__disable_irq();
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neopixel_send_buffer_nrf52((uint8_t *)(void *)port + 0x500, (pin.name & 31) | (br << 20), ptr,
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numBytes);
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__enable_irq();
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}
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static void neopixel_send_buffer(DevicePin &pin, const uint8_t *ptr, int numBytes) {
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neopixel_send_buffer_brightness(pin, ptr, numBytes, 0x100);
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}
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#else
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extern "C" void neopixel_send_buffer_core(DevicePin *pin, const uint8_t *ptr, int numBytes);
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__attribute__((noinline)) static void neopixel_send_buffer(DevicePin &pin, const uint8_t *ptr,
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int numBytes) {
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// setup pin as digital
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pin.setDigitalValue(0);
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wait_us(300); // initial reset
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__disable_irq();
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neopixel_send_buffer_core(&pin, ptr, numBytes);
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__enable_irq();
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}
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extern "C" void neopixel_send_buffer_brightness_core(DevicePin *pin, const uint8_t *ptr,
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int numBytes, int br);
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__attribute__((noinline)) static void
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neopixel_send_buffer_brightness(DevicePin &pin, const uint8_t *ptr, int numBytes, int br) {
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// setup pin as digital
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pin.setDigitalValue(0);
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wait_us(300); // initial reset
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__disable_irq();
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neopixel_send_buffer_brightness_core(&pin, ptr, numBytes, br);
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__enable_irq();
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}
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#endif
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namespace light {
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/**
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* Sends a color buffer to a light strip
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**/
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//% advanced=true
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void sendWS2812Buffer(Buffer buf, int pin) {
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if (!buf || !buf->length)
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return;
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neopixel_send_buffer(*pxt::getPin(pin), buf->data, buf->length);
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}
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/**
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* Sends a color buffer to a light strip
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**/
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//% advanced=true
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void sendWS2812BufferWithBrightness(Buffer buf, int pin, int brightness) {
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if (!buf || !buf->length)
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return;
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neopixel_send_buffer_brightness(*pxt::getPin(pin), buf->data, buf->length, brightness);
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}
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/**
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* Sets the light mode of a pin
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**/
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//% advanced=true
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//%
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void setMode(int pin, int mode) {}
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} // namespace light
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