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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>
120 lines
2.3 KiB
Go
120 lines
2.3 KiB
Go
//go:build avr && atmega328pb
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package machine
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import (
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"device/avr"
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"runtime/interrupt"
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"runtime/volatile"
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)
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const irq_USART0_RX = avr.IRQ_USART0_RX
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const irq_USART1_RX = avr.IRQ_USART1_RX
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var (
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UART1 = &_UART1
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_UART1 = UART{
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Buffer: NewRingBuffer(),
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dataReg: avr.UDR1,
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baudRegH: avr.UBRR1H,
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baudRegL: avr.UBRR1L,
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statusRegA: avr.UCSR1A,
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statusRegB: avr.UCSR1B,
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statusRegC: avr.UCSR1C,
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}
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)
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func init() {
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// Register the UART interrupt.
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interrupt.New(irq_USART1_RX, _UART1.handleInterrupt)
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}
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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.TWSR0,
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brReg: avr.TWBR0,
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crReg: avr.TWCR0,
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drReg: avr.TWDR0,
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srPS0: avr.TWSR0_TWPS0,
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srPS1: avr.TWSR0_TWPS1,
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crEN: avr.TWCR0_TWEN,
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crINT: avr.TWCR0_TWINT,
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crSTO: avr.TWCR0_TWSTO,
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crEA: avr.TWCR0_TWEA,
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crSTA: avr.TWCR0_TWSTA,
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}
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var I2C1 = &I2C{
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srReg: avr.TWSR1,
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brReg: avr.TWBR1,
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crReg: avr.TWCR1,
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drReg: avr.TWDR1,
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srPS0: avr.TWSR1_TWPS10,
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srPS1: avr.TWSR1_TWPS11,
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crEN: avr.TWCR1_TWEN1,
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crINT: avr.TWCR1_TWINT1,
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crSTO: avr.TWCR1_TWSTO1,
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crEA: avr.TWCR1_TWEA1,
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crSTA: avr.TWCR1_TWSTA1,
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}
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// SPI configuration
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var SPI0 = &SPI{
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spcr: avr.SPCR0,
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spdr: avr.SPDR0,
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spsr: avr.SPSR0,
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spcrR0: avr.SPCR0_SPR0,
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spcrR1: avr.SPCR0_SPR1,
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spcrCPHA: avr.SPCR0_CPHA,
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spcrCPOL: avr.SPCR0_CPOL,
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spcrDORD: avr.SPCR0_DORD,
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spcrSPE: avr.SPCR0_SPE,
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spcrMSTR: avr.SPCR0_MSTR,
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spsrI2X: avr.SPSR0_SPI2X,
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spsrSPIF: avr.SPSR0_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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var SPI1 = &SPI{
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spcr: avr.SPCR1,
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spdr: avr.SPDR1,
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spsr: avr.SPSR1,
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spcrR0: avr.SPCR1_SPR10,
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spcrR1: avr.SPCR1_SPR11,
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spcrCPHA: avr.SPCR1_CPHA1,
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spcrCPOL: avr.SPCR1_CPOL1,
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spcrDORD: avr.SPCR1_DORD1,
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spcrSPE: avr.SPCR1_SPE1,
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spcrMSTR: avr.SPCR1_MSTR1,
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spsrI2X: avr.SPSR1_SPI2X1,
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spsrSPIF: avr.SPSR1_SPIF1,
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sck: PC1,
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sdo: PE3,
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sdi: PC0,
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cs: PE2,
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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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case p >= PD0 && p <= PD7: // port D
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return avr.PORTD, 1 << uint8(p-portD)
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default: // port E
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return avr.PORTE, 1 << uint8(p-portE)
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}
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}
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