ESP32-IDF RMT module API wrapper for nanoFramework

Support

• ONLY Tx supported yet
• Autoselect RTM challen (0..7) for each new C# object, throws an exception, if all channels are used
• Connect to designed GPIO pin
• RTM module clock source select (wraped but not supported in IDF yet)
• Clock devider select
• Carier mode control
• Transmitter idle output level control
• Async Transmission a raw byte array containing a set of instructions for the RTM module (see rmt_item32_t)

Example

using nanoFramework.Hardware.Esp32.RMT.Tx;

...

// Register new RTM transmitter on GPIO15
var rmt_transmitter = Transmitter.Register(GPIO: 15);

// transmitter configuration
rmt_transmitter.CarierEnabled = false;
rmt_transmitter.isSource80MHz = true;
rmt_transmitter.ClockDivider = 4; // base period 80 MHz / 4 => 20 MHz -> 0.05 us
rmt_transmitter.IsTransmitIdleEnabled = true;
rmt_transmitter.TransmitIdleLevel = false;

// create new pulse command for to transmitt
// IDLE  0.5us  1us       1.5 us           2 us             2.5 us	   IDLE..
//      |----|        |------------|                |--------------------|
// -----|    |--------|            |----------------|                    |------
var commandlist = new PulseCommandList();
commandlist
	.AddLevel(true, 10)
	.AddLevel(false, 20)
	.AddLevel(true, 30)
	.AddLevel(false, 40)
	.AddLevel(true, 50);

rmt_transmitter.Send(commandlist);

// destroy transmitter instance and free associated RMT channel
rmt_transmitter.Dispose();

Result on GPIO15

Build

1. Clone repository into any dirrectory

git clone https://github.com/ololoshka2871/nanoFramework.Hardware.Esp32.RMT.git

2. Setup nf-interpreter build environment. Manual.

3. Copy file Native/FindINTEROP-nanoFramework.Hardware.Esp32.RMT.cmake.template to nf-interpreter\CMake\Modules\FindINTEROP-nanoFramework.Hardware.Esp32.RMT.cmake

4. Edit file nf-interpreter/CMake/Modules/FindINTEROP-nanoFramework.Hardware.Esp32.RMT.cmake Replace ${PROJECT_SOURCE_DIR}/<PATH_TO_YOUR nanoFramework.Hardware.Esp32.RMT/Native folder> to path of cloned repository.

5. Add string "NF_INTEROP_ASSEMBLIES" : [ "nanoFramework.Hardware.Esp32.RMT" ] to in file cmake-variants.json in nf-interpreter folder

6. Build and flash nf-interpreter into ESP32

7. Add reference to nanoFramework.Hardware.Esp32.RMT library into your C# project.

8. Build and deploy application into ESP32

9. Enjoy!

Applications

• Control WS2812 Led strips Library