da505a6b17
All the AVRs that I've looked at had the same pin/port structure, with the possible states being input/floating, input/pullup, low, and high (with the same PORT/DDR registers). The main difference is the number of available ports and pins. To reduce the amount of code and avoid duplication (and thus errors) I decided to centralize this, following the design used by the atmega2560 but while using a trick to save tracking a few registers. In the process, I noticed that the Pin.Get() function was incorrect on the atmega2560 implementation. It is now fixed in the unified code.
71 строка
1,2 КиБ
Go
71 строка
1,2 КиБ
Go
// +build avr,atmega1284p
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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_USART0_RX
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// Return the current CPU frequency in hertz.
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func CPUFrequency() uint32 {
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return 20000000
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}
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const (
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portA Pin = iota * 8
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portB
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portC
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portD
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)
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const (
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PA0 = portA + 0
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PA1 = portA + 1
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PA2 = portA + 2
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PA3 = portA + 3
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PA4 = portA + 4
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PA5 = portA + 5
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PA6 = portA + 6
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PA7 = portA + 7
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PB0 = portB + 0
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PB1 = portB + 1
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PB2 = portB + 2
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PB3 = portB + 3
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PB4 = portB + 4
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PB5 = portB + 5
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PB6 = portB + 6
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PB7 = portB + 7
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PC0 = portC + 0
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PC1 = portC + 1
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PC2 = portC + 2
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PC3 = portC + 3
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PC4 = portC + 4
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PC5 = portC + 5
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PC6 = portC + 6
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PC7 = portC + 7
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PD0 = portD + 0
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PD1 = portD + 1
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PD2 = portD + 2
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PD3 = portD + 3
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PD4 = portD + 4
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PD5 = portD + 5
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PD6 = portD + 6
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PD7 = portD + 7
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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 >= PA0 && p <= PA7:
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return avr.PORTA, 1 << uint8(p-portA)
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case p >= PB0 && p <= PB7:
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return avr.PORTB, 1 << uint8(p-portB)
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case p >= PC0 && p <= PC7:
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return avr.PORTC, 1 << uint8(p-portC)
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default:
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return avr.PORTD, 1 << uint8(p-portD)
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}
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}
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