System.Device.I2c.I2cDevice.Write transmits more bytes than expected

[RolandoMagico]

Details about Problem

nanoFramework area: C# code

VS version: 2019

VS extension version:

Target: ESP32

Device capabilities output:

Description

System.Device.I2c.I2cDevice.Write transmits all bytes of a byte array even if the length was reduced by a SpanByte.

Detailed repro steps so we can see the same problem

1. Hardware Setup
   ESP32 board (TTGO T-Beam) with a SH1106 display connected to I2C bus 1.

2. Code to reproduce

I2cDevice i2cDevice = I2cDevice.Create(new I2cConnectionSettings(1, 0x3C, I2cBusSpeed.StandardMode));
byte[] buffer = new byte[64];
buffer[0] = ControlByteData;
buffer[1] = 0x22;
SpanByte span = new SpanByte(buffer, 0, 2);
this.i2cDevice.Write(span);

3. Measure the transmitted data with a logic analyzer

Other suggested things

Expected behaviour

Only 2 bytes are transmitted via I2C, not 64 as seen in the logic analyzer screenshot.

Sample Project

https://github.com/RolandoMagico/TTGO-T-Beam-nanoframework/tree/bc9327cad90675bba1b1626e285ceb253556880a

(Enable test code in BaseDisplay constructor to test)

Screenshot

Span in the debugger:

I2C communication on the bus (65 bytes because of device address + 64 bytes of data):

[RolandoMagico]

Hello @AdrianSoundy ,
i made a proposal for an fix in the ESP32 target: https://github.com/RolandoMagico/nf-interpreter/commit/ac5e49515b912921cac34b383958b733f99cf5f6
Not quite sure if I can create a pull request for this change.
BR
Roland