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machine: make I2C usable in the simulator

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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
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src/machine/machine_fe310_simulator.go
+5
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@@ -0,0 +1,5 @@
//go:build !baremetal && hifive1b
package machine
var I2C0 = &I2C{Bus: 0, PinsSDA: []Pin{P12}, PinsSCL: []Pin{P13}}