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avr: use standard pin numbering

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This commit changes pin numbering for atmega328 based boards (Uno, Nano)
to use the standard format, where pin number is determined by the
pin/port. Previously, pin numbers were based on what the Uno uses, which
does not seem to have a clear pattern.

One difference is that counting starts at port B, as there is no port A.
So PB0 is 0, PB1 is 1… PC0 is 8.

This commit also moves PWM code to the atmega328 file, as it may not be
generic to all ATmega chips.
This commit is contained in:
Ayke van Laethem
2020-05-10 15:07:58 +02:00
committed by Ron Evans
parent 2c71f08922
commit 6b8940421e
8 changed files with 195 additions and 120 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/machine/machine_atmega.go
-66
View File
@@ -7,72 +7,6 @@ import (
"runtime/interrupt"
)
// InitPWM initializes the registers needed for PWM.
func InitPWM() {
// use waveform generation
avr.TCCR0A.SetBits(avr.TCCR0A_WGM00)
// set timer 0 prescale factor to 64
avr.TCCR0B.SetBits(avr.TCCR0B_CS01 | avr.TCCR0B_CS00)
// set timer 1 prescale factor to 64
avr.TCCR1B.SetBits(avr.TCCR1B_CS11)
// put timer 1 in 8-bit phase correct pwm mode
avr.TCCR1A.SetBits(avr.TCCR1A_WGM10)
// set timer 2 prescale factor to 64
avr.TCCR2B.SetBits(avr.TCCR2B_CS22)
// configure timer 2 for phase correct pwm (8-bit)
avr.TCCR2A.SetBits(avr.TCCR2A_WGM20)
}
// Configure configures a PWM pin for output.
func (pwm PWM) Configure() {
if pwm.Pin < 8 {
avr.DDRD.SetBits(1 << uint8(pwm.Pin))
} else {
avr.DDRB.SetBits(1 << uint8(pwm.Pin-8))
}
}
// Set turns on the duty cycle for a PWM pin using the provided value. On the AVR this is normally a
// 8-bit value ranging from 0 to 255.
func (pwm PWM) Set(value uint16) {
value8 := uint8(value >> 8)
switch pwm.Pin {
case 3:
// connect pwm to pin on timer 2, channel B
avr.TCCR2A.SetBits(avr.TCCR2A_COM2B1)
avr.OCR2B.Set(value8) // set pwm duty
case 5:
// connect pwm to pin on timer 0, channel B
avr.TCCR0A.SetBits(avr.TCCR0A_COM0B1)
avr.OCR0B.Set(value8) // set pwm duty
case 6:
// connect pwm to pin on timer 0, channel A
avr.TCCR0A.SetBits(avr.TCCR0A_COM0A1)
avr.OCR0A.Set(value8) // set pwm duty
case 9:
// connect pwm to pin on timer 1, channel A
avr.TCCR1A.SetBits(avr.TCCR1A_COM1A1)
// this is a 16-bit value, but we only currently allow the low order bits to be set
avr.OCR1AL.Set(value8) // set pwm duty
case 10:
// connect pwm to pin on timer 1, channel B
avr.TCCR1A.SetBits(avr.TCCR1A_COM1B1)
// this is a 16-bit value, but we only currently allow the low order bits to be set
avr.OCR1BL.Set(value8) // set pwm duty
case 11:
// connect pwm to pin on timer 2, channel A
avr.TCCR2A.SetBits(avr.TCCR2A_COM2A1)
avr.OCR2A.Set(value8) // set pwm duty
default:
panic("Invalid PWM pin")
}
}
// I2CConfig is used to store config info for I2C.
type I2CConfig struct {
Frequency uint32