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deadprogram
2bee29959b
Fixes #4663 "in reverse" by making SPI a pointer everywhere, as discussed in the comments. Signed-off-by: deadprogram <ron@hybridgroup.com>
61 lines
1.1 KiB
Go
61 lines
1.1 KiB
Go
//go:build avr && atmega328p
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package machine
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import (
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"device/avr"
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"runtime/volatile"
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)
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const irq_USART0_RX = avr.IRQ_USART_RX
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// I2C0 is the only I2C interface on most AVRs.
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var I2C0 = &I2C{
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srReg: avr.TWSR,
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brReg: avr.TWBR,
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crReg: avr.TWCR,
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drReg: avr.TWDR,
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srPS0: avr.TWSR_TWPS0,
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srPS1: avr.TWSR_TWPS1,
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crEN: avr.TWCR_TWEN,
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crINT: avr.TWCR_TWINT,
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crSTO: avr.TWCR_TWSTO,
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crEA: avr.TWCR_TWEA,
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crSTA: avr.TWCR_TWSTA,
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}
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// SPI configuration
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var SPI0 = &SPI{
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spcr: avr.SPCR,
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spdr: avr.SPDR,
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spsr: avr.SPSR,
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spcrR0: avr.SPCR_SPR0,
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spcrR1: avr.SPCR_SPR1,
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spcrCPHA: avr.SPCR_CPHA,
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spcrCPOL: avr.SPCR_CPOL,
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spcrDORD: avr.SPCR_DORD,
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spcrSPE: avr.SPCR_SPE,
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spcrMSTR: avr.SPCR_MSTR,
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spsrI2X: avr.SPSR_SPI2X,
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spsrSPIF: avr.SPSR_SPIF,
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sck: PB5,
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sdo: PB3,
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sdi: PB4,
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cs: PB2,
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}
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// getPortMask returns the PORTx register and mask for the pin.
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func (p Pin) getPortMask() (*volatile.Register8, uint8) {
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switch {
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case p >= PB0 && p <= PB7: // port B
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return avr.PORTB, 1 << uint8(p-portB)
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case p >= PC0 && p <= PC7: // port C
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return avr.PORTC, 1 << uint8(p-portC)
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default: // port D
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return avr.PORTD, 1 << uint8(p-portD)
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}
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}
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