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// +build nrf52
package machine
import (
"device/nrf"
"unsafe"
)
const CPU_FREQUENCY = 64000000
// Get peripheral and pin number for this GPIO pin.
func (p GPIO) getPortPin() (*nrf.GPIO_Type, uint8) {
return nrf.P0, p.Pin
}
func (uart UART) setPins(tx, rx uint32) {
nrf.UART0.PSELTXD.Set(tx)
nrf.UART0.PSELRXD.Set(rx)
}
//go:export UARTE0_UART0_IRQHandler
func handleUART0() {
UART0.handleInterrupt()
}
func (i2c I2C) setPins(scl, sda uint8) {
i2c.Bus.PSELSCL.Set(uint32(scl))
i2c.Bus.PSELSDA.Set(uint32(sda))
}
// SPI
func (spi SPI) setPins(sck, mosi, miso uint8) {
if sck == 0 {
sck = SPI0_SCK_PIN
}
if mosi == 0 {
mosi = SPI0_MOSI_PIN
}
if miso == 0 {
miso = SPI0_MISO_PIN
}
spi.Bus.PSEL.SCK.Set(uint32(sck))
spi.Bus.PSEL.MOSI.Set(uint32(mosi))
spi.Bus.PSEL.MISO.Set(uint32(miso))
}
// InitADC initializes the registers needed for ADC.
func InitADC() {
return // no specific setup on nrf52 machine.
}
// Configure configures an ADC pin to be able to read analog data.
func (a ADC) Configure() {
return // no pin specific setup on nrf52 machine.
}
// Get returns the current value of a ADC pin in the range 0..0xffff.
func (a ADC) Get() uint16 {
var pwmPin uint32
var value int16
switch a.Pin {
case 2:
pwmPin = nrf.SAADC_CH_PSELP_PSELP_AnalogInput0
case 3:
pwmPin = nrf.SAADC_CH_PSELP_PSELP_AnalogInput1
case 4:
pwmPin = nrf.SAADC_CH_PSELP_PSELP_AnalogInput2
case 5:
pwmPin = nrf.SAADC_CH_PSELP_PSELP_AnalogInput3
case 28:
pwmPin = nrf.SAADC_CH_PSELP_PSELP_AnalogInput4
case 29:
pwmPin = nrf.SAADC_CH_PSELP_PSELP_AnalogInput5
case 30:
pwmPin = nrf.SAADC_CH_PSELP_PSELP_AnalogInput6
case 31:
pwmPin = nrf.SAADC_CH_PSELP_PSELP_AnalogInput7
default:
return 0
}
nrf.SAADC.RESOLUTION.Set(nrf.SAADC_RESOLUTION_VAL_12bit)
// Enable ADC.
nrf.SAADC.ENABLE.Set(nrf.SAADC_ENABLE_ENABLE_Enabled << nrf.SAADC_ENABLE_ENABLE_Pos)
for i := 0; i < 8; i++ {
nrf.SAADC.CH[i].PSELN.Set(nrf.SAADC_CH_PSELP_PSELP_NC)
nrf.SAADC.CH[i].PSELP.Set(nrf.SAADC_CH_PSELP_PSELP_NC)
}
// Configure ADC.
nrf.SAADC.CH[0].CONFIG.Set(((nrf.SAADC_CH_CONFIG_RESP_Bypass << nrf.SAADC_CH_CONFIG_RESP_Pos) & nrf.SAADC_CH_CONFIG_RESP_Msk) |
((nrf.SAADC_CH_CONFIG_RESP_Bypass << nrf.SAADC_CH_CONFIG_RESN_Pos) & nrf.SAADC_CH_CONFIG_RESN_Msk) |
((nrf.SAADC_CH_CONFIG_GAIN_Gain1_5 << nrf.SAADC_CH_CONFIG_GAIN_Pos) & nrf.SAADC_CH_CONFIG_GAIN_Msk) |
((nrf.SAADC_CH_CONFIG_REFSEL_Internal << nrf.SAADC_CH_CONFIG_REFSEL_Pos) & nrf.SAADC_CH_CONFIG_REFSEL_Msk) |
((nrf.SAADC_CH_CONFIG_TACQ_3us << nrf.SAADC_CH_CONFIG_TACQ_Pos) & nrf.SAADC_CH_CONFIG_TACQ_Msk) |
((nrf.SAADC_CH_CONFIG_MODE_SE << nrf.SAADC_CH_CONFIG_MODE_Pos) & nrf.SAADC_CH_CONFIG_MODE_Msk))
// Set pin to read.
nrf.SAADC.CH[0].PSELN.Set(pwmPin)
nrf.SAADC.CH[0].PSELP.Set(pwmPin)
// Destination for sample result.
nrf.SAADC.RESULT.PTR.Set(uint32(uintptr(unsafe.Pointer(&value))))
nrf.SAADC.RESULT.MAXCNT.Set(1) // One sample
// Start tasks.
nrf.SAADC.TASKS_START.Set(1)
for nrf.SAADC.EVENTS_STARTED.Get() == 0 {
}
nrf.SAADC.EVENTS_STARTED.Set(0x00)
// Start the sample task.
nrf.SAADC.TASKS_SAMPLE.Set(1)
// Wait until the sample task is done.
for nrf.SAADC.EVENTS_END.Get() == 0 {
}
nrf.SAADC.EVENTS_END.Set(0x00)
// Stop the ADC
nrf.SAADC.TASKS_STOP.Set(1)
for nrf.SAADC.EVENTS_STOPPED.Get() == 0 {
}
nrf.SAADC.EVENTS_STOPPED.Set(0)
// Disable the ADC.
nrf.SAADC.ENABLE.Set(nrf.SAADC_ENABLE_ENABLE_Disabled << nrf.SAADC_ENABLE_ENABLE_Pos)
if value < 0 {
value = 0
}
// Return 16-bit result from 12-bit value.
return uint16(value << 4)
}
// PWM
var (
pwmChannelPins = [3]uint32{0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF}
pwms = [3]*nrf.PWM_Type{nrf.PWM0, nrf.PWM1, nrf.PWM2}
pwmChannelSequence [3]uint16
)
// InitPWM initializes the registers needed for PWM.
func InitPWM() {
return
}
// Configure configures a PWM pin for output.
func (pwm PWM) Configure() {
}
// Set turns on the duty cycle for a PWM pin using the provided value.
func (pwm PWM) Set(value uint16) {
for i := 0; i < 3; i++ {
if pwmChannelPins[i] == 0xFFFFFFFF || pwmChannelPins[i] == uint32(pwm.Pin) {
pwmChannelPins[i] = uint32(pwm.Pin)
pwmChannelSequence[i] = (value >> 2) | 0x8000 // set bit 15 to invert polarity
p := pwms[i]
p.PSEL.OUT[0].Set(uint32(pwm.Pin))
p.PSEL.OUT[1].Set(uint32(pwm.Pin))
p.PSEL.OUT[2].Set(uint32(pwm.Pin))
p.PSEL.OUT[3].Set(uint32(pwm.Pin))
p.ENABLE.Set(nrf.PWM_ENABLE_ENABLE_Enabled << nrf.PWM_ENABLE_ENABLE_Pos)
p.PRESCALER.Set(nrf.PWM_PRESCALER_PRESCALER_DIV_2)
p.MODE.Set(nrf.PWM_MODE_UPDOWN_Up)
p.COUNTERTOP.Set(16384) // frequency
p.LOOP.Set(0)
p.DECODER.Set((nrf.PWM_DECODER_LOAD_Common << nrf.PWM_DECODER_LOAD_Pos) | (nrf.PWM_DECODER_MODE_RefreshCount << nrf.PWM_DECODER_MODE_Pos))
p.SEQ[0].PTR.Set(uint32(uintptr(unsafe.Pointer(&pwmChannelSequence[i]))))
p.SEQ[0].CNT.Set(1)
p.SEQ[0].REFRESH.Set(1)
p.SEQ[0].ENDDELAY.Set(0)
p.TASKS_SEQSTART[0].Set(1)
break
}
}
}
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