How to compile Raspberry Pi Pico .pio files?

zapta · June 2, 2021, 5:33am

Is there a way to include in a platformio Pico/RP2040 project also .pio files? (For the programmable I/O state machines of the Pico)

For example

github.com

raspberrypi/pico-examples/blob/master/pio/i2c/i2c.pio

;
; Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
;
; SPDX-License-Identifier: BSD-3-Clause
;

.program i2c
.side_set 1 opt pindirs

; TX Encoding:
; | 15:10 | 9     | 8:1  | 0   |
; | Instr | Final | Data | NAK |
;
; If Instr has a value n > 0, then this FIFO word has no
; data payload, and the next n + 1 words will be executed as instructions.
; Otherwise, shift out the 8 data bits, followed by the ACK bit.
;
; The Instr mechanism allows stop/start/repstart sequences to be programmed
; by the processor, and then carried out by the state machine at defined points
; in the datastream.

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I am using @wizio ‘baremetal’ distribution but other distributions should also be ok.

maxgerhardt · June 2, 2021, 9:07am

Supported per Wiz-IO’s documentation.

board_build.pio = 
                      src/file_1.pio
                      src/file_2.pio
                      include/file_3.pio

I do not see it supported in PlatformIO’s raspberry platform.

zapta · June 2, 2021, 1:08pm

Thanks @maxgerhardt, this is exactly what I was looking for. I will give it a try.

Anyway way I look, I get back to WizIO’s ‘baremetal’. The Pico C++ SDK is too difficult to install, at least on windows, and the official Pico framework does not support the full SDK.

I hope that platform.io will adopt WizIO’s ‘baremetal’ as an official environment or provide a similar one.

maxgerhardt · June 2, 2021, 1:38pm

Issues Support .pio assembly files · Issue #10 · platformio/platform-raspberrypi · GitHub and Add baremetal as framework · Issue #4 · platformio/platform-raspberrypi · GitHub are open for that, so I hope they get addressed.

zapta · June 2, 2021, 4:02pm

Thanks @maxgerhardt! I just tried WizIO’s pio support and it’s very nice. It create a *.h file in the source directory which makes it very accessible.

BTW, is it a good idea to add also a feature request for a ‘baremetal’ Pico env with full SDK compatibility?

maxgerhardt · June 2, 2021, 5:10pm

Meaning what exactly? Isn’t that just compiling with the SDK ‘available’ but not using it?

zapta · June 2, 2021, 7:52pm

Not really. Some Pico examples wouldn’t compile with the Arduino variant, or any implicit resource allocation and initialization done by the Arduino framework, no the unavailability of main().