tinygo-org/tinygo
1
0
Fork 0
mirror of https://github.com/tinygo-org/tinygo.git synced 2026-08-15 00:13:43 +00:00
Code Issues Packages Projects Releases 6 Wiki Activity

machine: make I2C usable in the simulator

Browse Source 
This fixes/improves a few issues with I2C support:

  * Validate I2C pins, so only pins that are supported by the hardware
    can be used (similar to how it's done with PWM).
  * Add address to Tx API (without it, the simulator can't really
    simulate I2C).
  * Add frequency when configuring. Not currently used, but might be
    useful in the future and adding it now avoids possibly breaking
    changes.

This is a breaking change, but since the simulator doesn't support I2C
yet that seems fine to me. (It does in my local changes, but those need
to be cleaned up before I can push them).
This commit is contained in:
Ayke van Laethem
2025-07-07 13:40:44 +02:00
committed by Ron Evans
parent 35adbffa54
commit f845b469b1
9 changed files with 87 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/machine/machine_atsamd21_simulator.go
+18
View File
@@ -43,3 +43,21 @@ var TCC2 = &timerType{
{PA01, PA13, PA17}, // channel 1
},
}
var (
// According to the datasheet, only some pins have I2C support. However it
// looks like many boards just use any SERCOM I2C instance, even if the
// datasheet says those don't support I2C. I guess they do work in practice,
// then.
// These are:
// * PA00/PA01 for the Adafruit Circuit Playground Express (I2C1, SERCOM1).
// * PB02/PB03 for the Adafruit Circuit Playground Express (I2C0, SERCOM5).
// * PB08/PB09 for the Arduino Nano 33 IoT (I2C0, SERCOM4).
// https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/Atmel-42181-SAM-D21_Datasheet.pdf
sercomI2CM0 = &I2C{Bus: 0, PinsSDA: []Pin{PA08}, PinsSCL: []Pin{PA09}}
sercomI2CM1 = &I2C{Bus: 1, PinsSDA: []Pin{PA00, PA16}, PinsSCL: []Pin{PA01, PA17}}
sercomI2CM2 = &I2C{Bus: 2, PinsSDA: []Pin{PA08, PA12}, PinsSCL: []Pin{PA09, PA13}}
sercomI2CM3 = &I2C{Bus: 3, PinsSDA: []Pin{PA16, PA22}, PinsSCL: []Pin{PA17, PA23}}
sercomI2CM4 = &I2C{Bus: 4, PinsSDA: []Pin{PA12, PB08, PB12}, PinsSCL: []Pin{PA13, PB09, PB13}}
sercomI2CM5 = &I2C{Bus: 5, PinsSDA: []Pin{PA22, PB02, PB16, PB30}, PinsSCL: []Pin{PA23, PB03, PB17, PB31}}
)