github.com/tinygo-org/tinygo@v0.31.3-0.20240404173401-90b0bf646c27/src/machine/machine_atmega1284p.go (about)

     1  //go:build avr && atmega1284p
     2  
     3  package machine
     4  
     5  import (
     6  	"device/avr"
     7  	"runtime/volatile"
     8  )
     9  
    10  const irq_USART0_RX = avr.IRQ_USART0_RX
    11  
    12  // Return the current CPU frequency in hertz.
    13  func CPUFrequency() uint32 {
    14  	return 20000000
    15  }
    16  
    17  const (
    18  	portA Pin = iota * 8
    19  	portB
    20  	portC
    21  	portD
    22  )
    23  
    24  const (
    25  	PA0 = portA + 0
    26  	PA1 = portA + 1
    27  	PA2 = portA + 2
    28  	PA3 = portA + 3
    29  	PA4 = portA + 4
    30  	PA5 = portA + 5
    31  	PA6 = portA + 6
    32  	PA7 = portA + 7
    33  	PB0 = portB + 0
    34  	PB1 = portB + 1
    35  	PB2 = portB + 2
    36  	PB3 = portB + 3
    37  	PB4 = portB + 4
    38  	PB5 = portB + 5
    39  	PB6 = portB + 6
    40  	PB7 = portB + 7
    41  	PC0 = portC + 0
    42  	PC1 = portC + 1
    43  	PC2 = portC + 2
    44  	PC3 = portC + 3
    45  	PC4 = portC + 4
    46  	PC5 = portC + 5
    47  	PC6 = portC + 6
    48  	PC7 = portC + 7
    49  	PD0 = portD + 0
    50  	PD1 = portD + 1
    51  	PD2 = portD + 2
    52  	PD3 = portD + 3
    53  	PD4 = portD + 4
    54  	PD5 = portD + 5
    55  	PD6 = portD + 6
    56  	PD7 = portD + 7
    57  )
    58  
    59  // getPortMask returns the PORTx register and mask for the pin.
    60  func (p Pin) getPortMask() (*volatile.Register8, uint8) {
    61  	switch {
    62  	case p >= PA0 && p <= PA7:
    63  		return avr.PORTA, 1 << uint8(p-portA)
    64  	case p >= PB0 && p <= PB7:
    65  		return avr.PORTB, 1 << uint8(p-portB)
    66  	case p >= PC0 && p <= PC7:
    67  		return avr.PORTC, 1 << uint8(p-portC)
    68  	default:
    69  		return avr.PORTD, 1 << uint8(p-portD)
    70  	}
    71  }
    72  
    73  // SPI configuration
    74  var SPI0 = SPI{
    75  	spcr: avr.SPCR,
    76  	spsr: avr.SPSR,
    77  	spdr: avr.SPDR,
    78  	sck:  PB7,
    79  	sdo:  PB5,
    80  	sdi:  PB6,
    81  	cs:   PB4}