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machine/rp2040: add I2C support (#2013)

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machine/rp2040: add i2c support
This commit is contained in:
Patricio Whittingslow
2021-08-06 12:22:50 -03:00
committed by GitHub
parent cfae2d4f9a
commit 4f7b23c2b7
6 changed files with 522 additions and 9 deletions
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src/machine/machine_rp2040_gpio.go
+37 -6
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@@ -47,14 +47,27 @@ type pinFunc uint8
// GPIO function selectors
const (
fnJTAG pinFunc = 0
fnSPI pinFunc = 1
fnSPI pinFunc = 1 // Connect one of the internal PL022 SPI peripherals to GPIO
fnUART pinFunc = 2
fnI2C pinFunc = 3
fnPWM pinFunc = 4
fnSIO pinFunc = 5
fnPIO0 pinFunc = 6
fnPIO1 pinFunc = 7
// Connect a PWM slice to GPIO. There are eight PWM slices,
// each with two outputchannels (A/B). The B pin can also be used as an input,
// for frequency and duty cyclemeasurement
fnPWM pinFunc = 4
// Software control of GPIO, from the single-cycle IO (SIO) block.
// The SIO function (F5)must be selected for the processors to drive a GPIO,
// but the input is always connected,so software can check the state of GPIOs at any time.
fnSIO pinFunc = 5
// Connect one of the programmable IO blocks (PIO) to GPIO. PIO can implement a widevariety of interfaces,
// and has its own internal pin mapping hardware, allowing flexibleplacement of digital interfaces on bank 0 GPIOs.
// The PIO function (F6, F7) must beselected for PIO to drive a GPIO, but the input is always connected,
// so the PIOs canalways see the state of all pins.
fnPIO0, fnPIO1 pinFunc = 6, 7
// General purpose clock inputs/outputs. Can be routed to a number of internal clock domains onRP2040,
// e.g. Input: to provide a 1 Hz clock for the RTC, or can be connected to an internalfrequency counter.
// e.g. Output: optional integer divide
fnGPCK pinFunc = 8
// USB power control signals to/from the internal USB controller
fnUSB pinFunc = 9
fnNULL pinFunc = 0x1f
@@ -68,6 +81,7 @@ const (
PinInputPullup
PinAnalog
PinUART
PinI2C
PinSPI
)
@@ -91,7 +105,7 @@ func (p Pin) xor() {
// get returns the pin value
func (p Pin) get() bool {
return rp.SIO.GPIO_IN.HasBits(uint32(1) << p)
return rp.SIO.GPIO_IN.HasBits(1 << p)
}
func (p Pin) ioCtrl() *volatile.Register32 {
@@ -117,6 +131,17 @@ func (p Pin) pulloff() {
p.padCtrl().ClearBits(rp.PADS_BANK0_GPIO0_PUE)
}
// setSlew sets pad slew rate control.
// true sets to fast. false sets to slow.
func (p Pin) setSlew(sr bool) {
p.padCtrl().ReplaceBits(boolToBit(sr)<<rp.PADS_BANK0_GPIO0_SLEWFAST_Pos, rp.PADS_BANK0_GPIO0_SLEWFAST_Msk, 0)
}
// setSchmitt enables or disables Schmitt trigger.
func (p Pin) setSchmitt(trigger bool) {
p.padCtrl().ReplaceBits(boolToBit(trigger)<<rp.PADS_BANK0_GPIO0_SCHMITT_Pos, rp.PADS_BANK0_GPIO0_SCHMITT_Msk, 0)
}
// setFunc will set pin function to fn.
func (p Pin) setFunc(fn pinFunc) {
// Set input enable, Clear output disable
@@ -156,6 +181,12 @@ func (p Pin) Configure(config PinConfig) {
p.pulloff()
case PinUART:
p.setFunc(fnUART)
case PinI2C:
// IO config according to 4.3.1.3 of rp2040 datasheet.
p.setFunc(fnI2C)
p.pullup()
p.setSchmitt(true)
p.setSlew(false)
case PinSPI:
p.setFunc(fnSPI)
}