Couldn't automatically find serial port for Pico W during test

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1

Hello all,

I’m currently trying to use the unity test framework for my Raspberry Pi Pico W. I’m also running VSCode as superuser on an Arch Linux machine. While running pio test -vvv, I get some TimeoutErrors after the upload completes.

Building, uploading and monitoring works individually yet running the test doesn’t.

During the test i get this:

The device was rebooted to start the application.

Testing...
If you don't see any output for the first 10 secs, please reset board (press reset button)

[Errno 2] could not open port /dev/ttyACM0: [Errno 2] No such file or directory: '/dev/ttyACM0'

Alternatively if i comment test_port = /dev/ttyACM0 in the ini file, I get:

The device was rebooted to start the application.

Testing...
If you don't see any output for the first 10 secs, please reset board (press reset button)

TimeoutError: Could not automatically find serial port for the `Pico W` board based on the declared HWIDs=['2E8A:00C0', '2E8A:F00A']
TimeoutError: Could not automatically find serial port based on the known UART bridges

Below are the important files. Thank you for any suggestions!

platformio.ini

; PlatformIO Project Configuration File
;
;   Build options: build flags, source filter
;   Upload options: custom upload port, speed and extra flags
;   Library options: dependencies, extra library storages
;   Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html

[env:rpipicow]
platform = https://github.com/maxgerhardt/platform-raspberrypi
framework = arduino
board = rpipicow
board_build.core = earlephilhower

upload_protocol = picotool
upload_port = /dev/ttyACM0

monitor_speed = 115200
monitor_port = /dev/ttyACM0

check_tool = cppcheck

test_speed = 115200
test_port= /dev/ttyACM0

lib_deps =
    ESP8266WiFi
build_flags = -I include/

src/manager.cpp:

#include "manager.h"

// settings to make the manager pico an access point 
const char* ssid = "Manager";
const char* password = "123456789";

// for statics addressing our lovely network
IPAddress local_IP(192,168,0,2);
IPAddress gateway(192,168,0,1);
IPAddress subnet(255,255,255,0);

// Turns raspberry pi into an access point for other devices to connect to via WiFi
void initAP(String ssid, String password) {
    Serial.print("Attempting to create AP: ");
    Serial.println(WiFi.softAP(ssid, password, 1, false, 4) ? "Created" : "Failed");

    Serial.print("Attempting to configure AP: ");
    WiFi.softAPConfig(local_IP, gateway, subnet);
    Serial.println((WiFi.SSID() == ssid) ? "Configured" : "Failed"); 

    Serial.print("Local static IP: ");
    Serial.println(WiFi.softAPIP());
}

void setup() {
    // Allows us to see messages on our computers via serial monitor e.g. pio device monitor
    Serial.begin(115200);
    // 5 sec delay so that an external serial monitor can connect for debugging purposes
    delay(5000);

    initAP(ssid, password);
}

void loop() {

}

include/manager.h

#ifndef MANAGER_H
#define MANAGER_H

#include <Arduino.h>
#include <ESP8266WiFi.h>

void initAP();

#endif

test/testinitAP.cpp

#include <Arduino.h>
#include <unity.h>
#include <ESP8266WiFi.h>
#include "manager.h"

// settings to make the manager pico an access point 
const char* ssid = "Manager";
const char* password = "123456789";

// for statics addressing our lovely network
IPAddress local_IP(192,168,0,2);
IPAddress gateway(192,168,0,1);
IPAddress subnet(255,255,255,0);

/*
void test_ap_activated(void) {
    initAP(ssid, password);
    TEST_ASSERT_EQUAL_STRING(ssid, WiFi.softAPSSID().c_str());
    WiFi.softAPdisconnect();
}


void test_ap_local_ip(void) {
    initAP(ssid, password);
    IPAddress expected_ip(192, 168, 0, 1);
    TEST_ASSERT_EQUAL(expected_ip, WiFi.softAPIP());
    WiFi.softAPdisconnect();
}
*/

void test_stuff(void) {
    WiFi.softAP(ssid, password);
    TEST_ASSERT_EQUAL_STRING(ssid, WiFi.softAPSSID().c_str());
    WiFi.softAPdisconnect();
}

void setup(void) {

}

void tearDown(void) {

}

int main(void) {
    delay(10000);
    UNITY_BEGIN();
    RUN_TEST(test_stuff);
    //RUN_TEST(test_ap_activated);
    //RUN_TEST(test_ap_local_ip);
    return UNITY_END();
}
2

Does a minimal project work when you create it as such?

(you can exchange rpipico with rpipicow)

3

Hi maxgerhardt,

Thank you for the suggestion, I just edited my reply because i realised what you meant. When i used the same test made in the link you provided me, the test runner worked. I’ll see if i can do my tests using the structure you provided me. Thank you!

Edit Again:

It works thank you so much, I believe that having while(!Serial) delay(10); was the solution to make sure the test actually finds the port.

4

Just to say it explicitly: Do not overwrite the main() function in your test file for embedded devices. This is only valid for platform = native. When the firmware for unit testing is generated, it’s still done under framework = arduino, which means that there has to be a setup() and lopo() function – just like the official examples show.