Public API Functions

RMT driver initialization and control functions. More...

Functions
const ws2812b_drv_t *	ws2812b_if_getDrvRMT (void)
	Get RMT driver interface.
void	ws2812b_if_init (void)
	Initialize RMT peripheral for WS2812B control.
void	ws2812b_if_simpleTest (void)
	Run simple LED test sequence.

Detailed Description

RMT driver initialization and control functions.

Function Documentation

ws2812b_if_getDrvRMT()

const ws2812b_drv_t * ws2812b_if_getDrvRMT

(

void

)

Get RMT driver interface.

Returns

const ws2812b_drv_t* Pointer to driver interface structure

Returns function pointer structure for LED control. Use this interface to interact with LEDs.

Example:

const ws2812b_drv_t *drv = ws2812b_if_getDrvRMT();
drv->SetOneDiodeRGB(0, 255, 0, 0);
drv->Refresh();

Note

Must call ws2812b_if_init() before using driver

ws2812b_if_init()

void ws2812b_if_init

(

void

)

Initialize RMT peripheral for WS2812B control.

Initializes ESP32-C6 RMT peripheral with WS2812B-specific configuration.

Initialization Steps:

1. Configure RMT bytes encoder (0.3µs / 0.9µs timing)
2. Create RMT TX channel on specified GPIO
3. Configure 64-symbol memory blocks (reduces flickering)
4. Set up 4-deep transaction queue for smooth updates
5. Enable RMT channel

RMT Configuration:

• Resolution: 10MHz (0.1µs per tick)
• Bit 0: 0.3µs HIGH + 0.9µs LOW
• Bit 1: 0.9µs HIGH + 0.3µs LOW
• MSB first transmission
• DMA enabled

Note

Call once during application startup

Must be called before any LED operations

Warning

Crashes if RMT channel allocation fails

See also

ws2812b_if_getDrvRMT() to get driver interface

ws2812b_if_simpleTest()

void ws2812b_if_simpleTest

(

void

)

Run simple LED test sequence.

Cycles through LEDs one by one in red, green, blue sequence. Useful for testing LED strip connectivity and order.

Test Sequence:

1. Light LED 0 red
2. Light LED 1 red
3. ... through all LEDs red
4. Light LED 0 green
5. ... through all LEDs green
6. Light LED 0 blue
7. ... through all LEDs blue
8. Repeat

Usage:

void test_task(void *pvParameters) {
    ws2812b_if_init();
    
    while(1) {
        ws2812b_if_simpleTest();
        vTaskDelay(pdMS_TO_TICKS(100));  // 100ms delay
    }
}

Note

Add to FreeRTOS task with delay

Static state maintained between calls

Warning

Do not call faster than 10ms