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https://github.com/tinygo-org/tinygo.git
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Ayke van Laethem
f845b469b1
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).
64 lines
2.4 KiB
Go
64 lines
2.4 KiB
Go
//go:build !baremetal && (gemma_m0 || qtpy || trinket_m0 || arduino_mkr1000 || arduino_mkrwifi1010 || arduino_nano33 || arduino_zero || circuitplay_express || feather_m0_express || feather_m0 || itsybitsy_m0 || p1am_100 || xiao)
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// Simulated atsamd21 chips.
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package machine
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// The timer channels/pins match the hardware, and encode the same information
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// as pinTimerMapping but in a more generic (less efficient) way.
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var TCC0 = &timerType{
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instance: 0,
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frequency: 48e6,
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bits: 24,
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prescalers: []int{1, 2, 4, 8, 16, 64, 256, 1024},
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channelPins: [][]Pin{
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{PA04, PA08, PB10, PA14, PB16, PA22, PB30}, // channel 0
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{PA05, PA09, PB11, PA15, PB17, PA23, PB31}, // channel 1
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{PA10, PB12, PA12, PA16, PA18, PA20}, // channel 2
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{PA11, PB13, PA13, PA17, PA19, PA21}, // channel 3
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},
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}
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var TCC1 = &timerType{
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instance: 1,
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frequency: 48e6,
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bits: 24,
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prescalers: []int{1, 2, 4, 8, 16, 64, 256, 1024},
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channelPins: [][]Pin{
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{PA06, PA10, PA30}, // channel 0
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{PA07, PA11, PA31}, // channel 1
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{PA08, PA24, PB30}, // channel 2
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{PA09, PA25, PB31}, // channel 3
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},
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}
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var TCC2 = &timerType{
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instance: 2,
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frequency: 48e6,
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bits: 16,
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prescalers: []int{1, 2, 4, 8, 16, 64, 256, 1024},
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channelPins: [][]Pin{
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{PA00, PA12, PA16}, // channel 0
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{PA01, PA13, PA17}, // channel 1
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},
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}
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var (
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// According to the datasheet, only some pins have I2C support. However it
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// looks like many boards just use any SERCOM I2C instance, even if the
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// datasheet says those don't support I2C. I guess they do work in practice,
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// then.
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// These are:
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// * PA00/PA01 for the Adafruit Circuit Playground Express (I2C1, SERCOM1).
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// * PB02/PB03 for the Adafruit Circuit Playground Express (I2C0, SERCOM5).
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// * PB08/PB09 for the Arduino Nano 33 IoT (I2C0, SERCOM4).
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// https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/Atmel-42181-SAM-D21_Datasheet.pdf
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sercomI2CM0 = &I2C{Bus: 0, PinsSDA: []Pin{PA08}, PinsSCL: []Pin{PA09}}
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sercomI2CM1 = &I2C{Bus: 1, PinsSDA: []Pin{PA00, PA16}, PinsSCL: []Pin{PA01, PA17}}
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sercomI2CM2 = &I2C{Bus: 2, PinsSDA: []Pin{PA08, PA12}, PinsSCL: []Pin{PA09, PA13}}
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sercomI2CM3 = &I2C{Bus: 3, PinsSDA: []Pin{PA16, PA22}, PinsSCL: []Pin{PA17, PA23}}
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sercomI2CM4 = &I2C{Bus: 4, PinsSDA: []Pin{PA12, PB08, PB12}, PinsSCL: []Pin{PA13, PB09, PB13}}
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sercomI2CM5 = &I2C{Bus: 5, PinsSDA: []Pin{PA22, PB02, PB16, PB30}, PinsSCL: []Pin{PA23, PB03, PB17, PB31}}
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)
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