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//go:build rp2040
package machine
import (
"device/rp"
"runtime/volatile"
"unsafe"
)
const (
_NUMBANK0_GPIOS = 30
_NUMBANK0_IRQS = 4
_NUMIRQ = 32
rp2350ExtraReg = 0
RESETS_RESET_Msk = 0x01ffffff
initUnreset = rp.RESETS_RESET_ADC |
rp.RESETS_RESET_RTC |
rp.RESETS_RESET_SPI0 |
rp.RESETS_RESET_SPI1 |
rp.RESETS_RESET_UART0 |
rp.RESETS_RESET_UART1 |
rp.RESETS_RESET_USBCTRL
initDontReset = rp.RESETS_RESET_IO_QSPI |
rp.RESETS_RESET_PADS_QSPI |
rp.RESETS_RESET_PLL_USB |
rp.RESETS_RESET_USBCTRL |
rp.RESETS_RESET_SYSCFG |
rp.RESETS_RESET_PLL_SYS
padEnableMask = rp.PADS_BANK0_GPIO0_IE_Msk |
rp.PADS_BANK0_GPIO0_OD_Msk
)
const (
PinOutput PinMode = iota
PinInput
PinInputPulldown
PinInputPullup
PinAnalog
PinUART
PinPWM
PinI2C
PinSPI
PinPIO0
PinPIO1
)
const (
ClkGPOUT0 clockIndex = iota // GPIO Muxing 0
ClkGPOUT1 // GPIO Muxing 1
ClkGPOUT2 // GPIO Muxing 2
ClkGPOUT3 // GPIO Muxing 3
ClkRef // Watchdog and timers reference clock
ClkSys // Processors, bus fabric, memory, memory mapped registers
ClkPeri // Peripheral clock for UART and SPI
ClkUSB // USB clock
ClkADC // ADC clock
ClkRTC // Real time clock
NumClocks
)
func CalcClockDiv(srcFreq, freq uint32) uint32 {
// Div register is 24.8 int.frac divider so multiply by 2^8 (left shift by 8)
return uint32((uint64(srcFreq) << 8) / uint64(freq))
}
type clocksType struct {
clk [NumClocks]clockType
resus struct {
ctrl volatile.Register32
status volatile.Register32
}
fc0 fc
wakeEN0 volatile.Register32
wakeEN1 volatile.Register32
sleepEN0 volatile.Register32
sleepEN1 volatile.Register32
enabled0 volatile.Register32
enabled1 volatile.Register32
intR volatile.Register32
intE volatile.Register32
intF volatile.Register32
intS volatile.Register32
}
// GPIO function selectors
const (
fnJTAG pinFunc = 0
fnSPI pinFunc = 1 // Connect one of the internal PL022 SPI peripherals to GPIO
fnUART pinFunc = 2
fnI2C pinFunc = 3
// 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
fnXIP pinFunc = 0
)
// Configure configures the gpio pin as per mode.
func (p Pin) Configure(config PinConfig) {
if p == NoPin {
return
}
p.init()
mask := uint32(1) << p
switch config.Mode {
case PinOutput:
p.setFunc(fnSIO)
rp.SIO.GPIO_OE_SET.Set(mask)
case PinInput:
p.setFunc(fnSIO)
p.pulloff()
case PinInputPulldown:
p.setFunc(fnSIO)
p.pulldown()
case PinInputPullup:
p.setFunc(fnSIO)
p.pullup()
case PinAnalog:
p.setFunc(fnNULL)
p.pulloff()
case PinUART:
p.setFunc(fnUART)
case PinPWM:
p.setFunc(fnPWM)
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)
case PinPIO0:
p.setFunc(fnPIO0)
case PinPIO1:
p.setFunc(fnPIO1)
}
}
var (
timer = (*timerType)(unsafe.Pointer(rp.TIMER))
)
// Enable or disable a specific interrupt on the executing core.
// num is the interrupt number which must be in [0,31].
func irqSet(num uint32, enabled bool) {
if num >= _NUMIRQ {
return
}
irqSetMask(1<<num, enabled)
}
func irqSetMask(mask uint32, enabled bool) {
if enabled {
// Clear pending before enable
// (if IRQ is actually asserted, it will immediately re-pend)
rp.PPB.NVIC_ICPR.Set(mask)
rp.PPB.NVIC_ISER.Set(mask)
} else {
rp.PPB.NVIC_ICER.Set(mask)
}
}
func (clks *clocksType) initRTC() {
// ClkRTC = pllUSB (48MHz) / 1024 = 46875Hz
clkrtc := clks.clock(ClkRTC)
clkrtc.configure(0, // No GLMUX
rp.CLOCKS_CLK_RTC_CTRL_AUXSRC_CLKSRC_PLL_USB,
48*MHz,
46875)
}
func (clks *clocksType) initTicks() {} // No ticks on RP2040
// startTick starts the watchdog tick.
// cycles needs to be a divider that when applied to the xosc input,
// produces a 1MHz clock. So if the xosc frequency is 12MHz,
// this will need to be 12.
func (wd *watchdogImpl) startTick(cycles uint32) {
rp.WATCHDOG.TICK.Set(cycles | rp.WATCHDOG_TICK_ENABLE)
}
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