AVR (ATmega328P): UART/SPI HAL, drivers.zig, and nRF24L01+ driver (Emakefun RF-Nano V3.0)
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调研方向
Start with the referenced ATtiny port (#947), the related issues #637 and #701, and the existing work listed in the body, especially draft #1070. The plan spans an ATmega328P HAL, adapters, timing, an nRF24L01+ driver with unit tests, and examples; first get maintainer feedback on the open API and hardware questions. Done means the proposed steps are accepted and implemented, including tested send/receive examples.
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描述
I'd like to add support for the Emakefun RF-Nano V3.0 (repo): an Arduino Nano clone (ATmega328P @ 16 MHz) with an onboard nRF24L01+ on the hardware SPI bus. I have the boards and test everything on hardware.
Already up: #1063 (blinky delay), #1064 (board), #1068 (.rodata in RAM, fixes #679), #1071 (GPIO read() fix) and #1070 (UART HAL, draft).
Plan, one PR per step, with HAL files under hals/atmega328p/ like the ATtiny port (#947):
- UART (#1070).
- SPI host HAL.
drivers.zigadapting the HAL toDatagramDevice,Digital_IOandClockDevice, like ch32v, plus a small Timer0-basedtime.zig.- An MCU-agnostic nRF24L01+ driver in
drivers/src/wireless, followingssd1306.zig, with unit tests. It polls STATUS, since IRQ isn't wired on this board. - Send/receive examples between two boards.
Note: on AVR, Zig 0.17.0 fails to compile some error unions with a payload (ziglang/zig#37099, fix pending). So for now there's no std.Io for the UART, and drivers can't use DatagramDevice.read.
Questions:
DatagramDevicehas no full-duplex transfer, so the STATUS byte the nRF24 sends back with every command is lost, and the driver needs an extra transaction to read it. Is that fine, or would you rather add atransceiveoperation (related to #637/#701)?ClockDeviceneeds a monotonicu64microsecond clock. I'd use the Timer0 overflow (4 µs ticks), with the HAL exporting theTIMER0_OVFhandler for the app to register. That takes over PWM on D5/D6. OK, or is there a preferred approach?- AVR GPIO uses
sbi/cbi, which need comptime operands, so theDigital_IOadapter would be one type per comptime pin (e.g.GPIO_Device(.d, 7)). OK?
Is the nRF24 driver welcome in drivers/? Any feedback is appreciated!
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