Raspberry pi pico unable to use 2 hardware serial ports (Serial1&2) #210

MNS26 · 2021-04-28T20:26:02Z

I was redirected here form platfromIO to open an issue about it.
( platformio/platform-raspberrypi#3 )

I've been trying it read my gps module for a project and decided to use the pi pico for it, however even though it "sees" the connection (no check wire connection message) it receives no data.

i used the default "FullExampel" file from the TinyGPS library
i removed SoftwareSerial because there is no interrup.h file and replaced it with Serial1 (RP pi pico should be able to have 2 hardware serial connections)

GPS lock is established (red led)

data from serial console

Gerriko · 2021-05-25T20:15:23Z

I've tested this using a standard Raspberry Pi Pico board and I was able to get the Pico to use a 2nd serial port (as well as still use USB/CDC Virtual Serial), but it requires modifying ArduinoCore-mbed code.

However, I think that this mod requires plenty of testing as on my first few tests it appears unstable. When I reset my board using my own reset button I get an mbed error on the Serial1 port only. But then this error clears on 2nd reset and my test sketch works. The error only happens with a manual reset otherwise my mod appears to work.

++ MbedOS Error Info ++
Error Status: 0x80010133 Code: 307 Module: 1
Error Message: Mutex: 0x2000C274, Not allowed in ISR context
Location: 0x10004007
Error Value: 0x2000C274
Current Thread: rtx_idle Id: 0x2000CE30 Entry: 0x10004011 StackSize: 0x200 StackMem: 0x2000B9B8 SP: 0x2003FD14 
For more info, visit: https://mbed.com/s/error?error=0x80010133&osver=61000&core=0x410CC601&comp=2&ver=100300&tgt=RASPBERRY_PI...

-- MbedOS Error Info --

So what did I do...
First, you need to open up pin_arduino.h found in the variants/RASPBERRY_PI_PICO folder:
https://github.com/arduino/ArduinoCore-mbed/blob/master/variants/RASPBERRY_PI_PICO/pins_arduino.h

Then for my Serial pins I used the following (I believe you are quite limited on choice of pins to prevent clashing with SPI/I2C):

// Serial
#define PIN_SERIAL_TX (0ul)
#define PIN_SERIAL_RX (1ul)
#define PIN_SERIAL_TX2 (8ul)
#define PIN_SERIAL_RX2 (9ul)

Then you add in some new additions. First increase SERIAL_HOWMANY to 2 and then add in SERIAL2 TX/RX

#define SERIAL_HOWMANY		2
#define SERIAL1_TX			(digitalPinToPinName(PIN_SERIAL_TX))
#define SERIAL1_RX			(digitalPinToPinName(PIN_SERIAL_RX))
#define SERIAL2_TX			(digitalPinToPinName(PIN_SERIAL_TX2))
#define SERIAL2_RX			(digitalPinToPinName(PIN_SERIAL_RX2))

And that is all I did.

I was not sure about this code though and what it was doing internally:

#define SERIAL_PORT_HARDWARE        Serial1
#define SERIAL_PORT_HARDWARE_OPEN   Serial1

Then for my Arduino sketch, I simply modified the existing SerialPassthrough sketch as follows:

void setup() {
  Serial.begin(115200);
  Serial1.begin(115200);
  Serial2.begin(115200);

  delay(100);
  Serial.println("Lets start");
  // Just a quick initial test to make sure I am seeing text in both my serial terminals
  for (auto i = 0; i < 6; i++) {
    delay(3000);
    Serial1.println("Hello world 1");  
    Serial2.println("Hello world 2");
  }
  Serial.println("We are finished first test");
}

void loop() {
  if (Serial2.available()) {      // If anything comes in Serial (USB),
    Serial1.write(Serial2.read());   // read it and send it out Serial1 (pins 0 & 1)
    Serial.print(".");          // output via usb just in case we don't get anything
  }

  if (Serial1.available()) {     // If anything comes in Serial1 (pins 0 & 1)
    Serial2.write(Serial1.read());   // read it and send it out Serial (USB)
    Serial.print(".");          // output via usb just in case we don't get anything
  }
}

facchinm · 2021-05-27T09:58:00Z

Hi @MNS26 and @Gerriko ,
I just posted a PR #240 to ease the creation of additional serial objects without touching the core.
By applying it the resulting sketch will look like

UART Serial2(8,9);

void setup() {
  Serial.begin(115200);
  Serial1.begin(115200);
  Serial2.begin(115200);

  delay(100);
  Serial.println("Lets start");
  // Just a quick initial test to make sure I am seeing text in both my serial terminals
  for (auto i = 0; i < 6; i++) {
    delay(3000);
    Serial1.println("Hello world 1");  
    Serial2.println("Hello world 2");
  }
  Serial.println("We are finished first test");
}

void loop() {
  if (Serial2.available()) {      // If anything comes in Serial (USB),
    Serial1.write(Serial2.read());   // read it and send it out Serial1 (pins 0 & 1)
    Serial.print(".");          // output via usb just in case we don't get anything
  }

  if (Serial1.available()) {     // If anything comes in Serial1 (pins 0 & 1)
    Serial2.write(Serial1.read());   // read it and send it out Serial (USB)
    Serial.print(".");          // output via usb just in case we don't get anything
  }
}

I tested it on a Pico and couldn't reproduce the crash that @Gerriko is reporting. Could you test if the issue is reproducible after the PR is applied? Thx

MNS26 · 2021-05-29T13:10:27Z

Hi @MNS26 and @Gerriko ,
I just posted a PR #240 to ease the creation of additiona serial objects without touching the core.
By apply it the resulting sketch will look like

UART Serial2(8,9);

void setup() {
  Serial.begin(115200);
  Serial1.begin(115200);
  Serial2.begin(115200);

  delay(100);
  Serial.println("Lets start");
  // Just a quick initial test to make sure I am seeing text in both my serial terminals
  for (auto i = 0; i < 6; i++) {
    delay(3000);
    Serial1.println("Hello world 1");  
    Serial2.println("Hello world 2");
  }
  Serial.println("We are finished first test");
}

void loop() {
  if (Serial2.available()) {      // If anything comes in Serial (USB),
    Serial1.write(Serial2.read());   // read it and send it out Serial1 (pins 0 & 1)
    Serial.print(".");          // output via usb just in case we don't get anything
  }

  if (Serial1.available()) {     // If anything comes in Serial1 (pins 0 & 1)
    Serial2.write(Serial1.read());   // read it and send it out Serial (USB)
    Serial.print(".");          // output via usb just in case we don't get anything
  }
}

I tested it on a Pico and couldn't reproduce the crash that @Gerriko is reporting. Could you test if the issue is reproducible after the PR is applied? Thx

@facchinm after i edited the pins_arduino.h file and tried to use your example i cant get it to compile, everytime i try to do it i get this

> Executing task: C:\Users\MS26\.platformio\penv\Scripts\platformio.exe run --environment pico helicopter <

Processing pico helicopter (platform: https://github.com/platformio/platform-raspberrypi.git; framework: arduino; board: pico)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/raspberrypi/pico.html
PLATFORM: Raspberry Pi RP2040 (1.0.0+sha.095da74) > Raspberry Pi Pico
HARDWARE: RP2040 133MHz, 264KB RAM, 2MB Flash
DEBUG: Current (cmsis-dap) External (cmsis-dap, jlink, raspberrypi-swd)
PACKAGES:
 - framework-arduino-mbed 2.1.0
 - tool-rp2040tools 1.0.2
 - toolchain-gccarmnoneeabi 1.90201.191206 (9.2.1)
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 31 compatible libraries
Scanning dependencies...
Dependency Graph
|-- <Wire>
|-- <TinyGPSPlus> 1.0.2
Building in release mode
Compiling .pio\build\pico helicopter\src\main.cpp.o
Compiling .pio\build\pico helicopter\src\main1.cpp.o
Compiling .pio\build\pico helicopter\lib1b0\Wire\Wire.cpp.o
Compiling .pio\build\pico helicopter\libf0e\TinyGPSPlus\TinyGPS++.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduinoVariant\double_tap_usb_boot.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduinoVariant\variant.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\Interrupts.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\Serial.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\Tone.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\USB\PluggableUSBDevice.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\USB\USBCDC.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\USB\USBSerial.cpp.o
In file included from C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_regs/include/hardware/platform_defs.h:12,
                 from C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2_common/pico_platform/include/pico/platform.h:12,
                 from C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/common/pico_base/include/pico.h:19,
                 from C:\Users\MS26\.platformio\packages\framework-arduino-mbed\variants\RASPBERRY_PI_PICO\double_tap_usb_boot.cpp:2:
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2_common/hardware_timer/include/hardware/timer.h: In function 'uint32_t time_us_32()':       
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_regs/include/hardware/regs/addressmap.h:56:20: warning: type qualifiers ignored on cast result type [-Wignored-qualifiers]
   56 | #define TIMER_BASE 0x40054000
      |                    ^~~~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_structs/include/hardware/structs/timer.h:33:38: note: in expansion of macro 'TIMER_BASE'
   33 | #define timer_hw ((timer_hw_t *const)TIMER_BASE)
      |                                      ^~~~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2_common/hardware_timer/include/hardware/timer.h:66:12: note: in expansion of macro 'timer_hw'
   66 |     return timer_hw->timerawl;
      |            ^~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2_common/hardware_timer/include/hardware/timer.h: In function 'bool time_reached(absolute_time_t)':
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_regs/include/hardware/regs/addressmap.h:56:20: warning: type qualifiers ignored on cast result type [-Wignored-qualifiers]
   56 | #define TIMER_BASE 0x40054000
      |                    ^~~~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_structs/include/hardware/structs/timer.h:33:38: note: in expansion of macro 'TIMER_BASE'
   33 | #define timer_hw ((timer_hw_t *const)TIMER_BASE)
      |                                      ^~~~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2_common/hardware_timer/include/hardware/timer.h:110:19: note: in expansion of macro 'timer_hw'
  110 |     uint32_t hi = timer_hw->timerawh;
      |                   ^~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_regs/include/hardware/regs/addressmap.h:56:20: warning: type qualifiers ignored on cast result type [-Wignored-qualifiers]
   56 | #define TIMER_BASE 0x40054000
      |                    ^~~~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_structs/include/hardware/structs/timer.h:33:38: note: in expansion of macro 'TIMER_BASE'
   33 | #define timer_hw ((timer_hw_t *const)TIMER_BASE)
      |                                      ^~~~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2_common/hardware_timer/include/hardware/timer.h:111:33: note: in expansion of macro 'timer_hw'
  111 |     return (hi >= hi_target && (timer_hw->timerawl >= (uint32_t) target || hi != hi_target));
      |                                 ^~~~~~~~
src\main1.cpp:16: warning: "PIN_SERIAL_TX" redefined
   16 | #define PIN_SERIAL_TX (4)
      |
In file included from C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Arduino.h:79,
                 from src\main1.cpp:1:
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\variants\RASPBERRY_PI_PICO/pins_arduino.h:41: note: this is the location of the previous definition
   41 | #define PIN_SERIAL_TX (0ul)
      |
src\main1.cpp:17: warning: "PIN_SERIAL_RX" redefined
   17 | #define PIN_SERIAL_RX (5)
      |
In file included from C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Arduino.h:79,
                 from src\main1.cpp:1:
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\variants\RASPBERRY_PI_PICO/pins_arduino.h:42: note: this is the location of the previous definition
   42 | #define PIN_SERIAL_RX (1ul)
      |
src\main.cpp:3:17: error: no matching function for call to 'arduino::UART::UART(int, int)'
    3 | UART Serial2(4,5);
      |                 ^
In file included from C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Arduino.h:105,
                 from src\main.cpp:1:
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:42:3: note: candidate: 'arduino::UART::UART()'
   42 |   UART() {
      |   ^~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:42:3: note:   candidate expects 0 arguments, 2 provided
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:41:3: note: candidate: 'arduino::UART::UART(int, int, int, int)'
   41 |   UART(int tx, int rx, int rts, int cts) : _tx((PinName)tx), _rx((PinName)rx), _rts((PinName)rts), _cts((PinName)cts) {}
      |   ^~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:41:3: note:   candidate expects 4 arguments, 2 provided
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:39:7: note: candidate: 'constexpr arduino::UART::UART(const arduino::UART&)'
   39 | class UART : public HardwareSerial {
      |       ^~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:39:7: note:   candidate expects 1 argument, 2 provided
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:39:7: note: candidate: 'constexpr arduino::UART::UART(arduino::UART&&)'
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:39:7: note:   candidate expects 1 argument, 2 provided
.pio\libdeps\pico helicopter\TinyGPSPlus\src\TinyGPS++.cpp: In member function 'bool TinyGPSPlus::encode(char)':
.pio\libdeps\pico helicopter\TinyGPSPlus\src\TinyGPS++.cpp:63:12: warning: this statement may fall through [-Wimplicit-fallthrough=]
   63 |     parity ^= (uint8_t)c;
      |     ~~~~~~~^~~~~~~~~~~~~
.pio\libdeps\pico helicopter\TinyGPSPlus\src\TinyGPS++.cpp:64:3: note: here
   64 |   case '\r':
      |   ^~~~
*** [.pio\build\pico helicopter\src\main.cpp.o] Error 1
================================================================================================ [FAILED] Took 16.64 seconds ================================================================================================
The terminal process "C:\Users\MS26\.platformio\penv\Scripts\platformio.exe 'run', '--environment', 'pico helicopter'" terminated with exit code: 1.

Terminal will be reused by tasks, press any key to close it.

and the code i used

#include <Arduino.h>

UART Serial2(4,5);

void setup() {
  Serial.begin(115200);
  Serial1.begin(115200);
  Serial2.begin(115200);

  delay(100);
  Serial.println("Lets start");
  // Just a quick initial test to make sure I am seeing text in both my serial terminals
  for (auto i = 0; i < 6; i++) {
    delay(3000);
    Serial1.println("Hello world 1");  
    Serial2.println("Hello world 2");
  }
  Serial.println("We are finished first test");
}

void loop() {
  if (Serial2.available()) {      // If anything comes in Serial (USB),
    Serial.write(Serial2.read());   // read it and send it out Serial1 (pins 0 & 1)
    Serial.println();          // output via usb just in case we don't get anything
  }
/*
  if (Serial1.available()) {     // If anything comes in Serial1 (pins 0 & 1)
    Serial2.write(Serial1.read());   // read it and send it out Serial (USB)
    Serial.print(".");          // output via usb just in case we don't get anything
  }*/
}

Gerriko · 2021-05-30T10:30:26Z

@MNS26 you say " i edited the pins_arduino.h file "

When looking through the error log it tells you "warning: "PIN_SERIAL_TX" redefined" and "warning: "PIN_SERIAL_RX" redefined".

That suggests to me that Serial2 and Serial1 and trying to use the same PIN_SERIAL_TX and PIN_SERIAL_RX.

Maybe check your pins_arduino.h file again.

MNS26 · 2021-05-31T15:14:15Z

@Gerriko I have pin GP4 and pin GP5 for serial 1 (GPS) and plan on using GP12 and GP13 for serial 0 (RC receiver).
In the pins_arduino.h file
pin definition

// Serial
#define PIN_SERIAL_TX (0ul)
#define PIN_SERIAL_RX (1ul)

#define PIN_SERIAL_TX2 (8ul)
#define PIN_SERIAL_RX2 (9ul)

serialX definition

//SERIAL Setup
#define SERIAL_HOWMANY		2
#define SERIAL1_TX			(digitalPinToPinName(PIN_SERIAL_TX))
#define SERIAL1_RX			(digitalPinToPinName(PIN_SERIAL_RX))

#define SERIAL2_TX			(digitalPinToPinName(PIN_SERIAL_TX2))
#define SERIAL2_RX			(digitalPinToPinName(PIN_SERIAL_RX2))

i used GP0 and GP1 for a I2C sensor (mpu6050 with auxiliary I2C enabled for compass).

EDIT:
Found the redefine issue (a file i forgot to remove in the project folder).
but now the output changed to

> Executing task: C:\Users\MS26\.platformio\penv\Scripts\platformio.exe run --environment pico helicopter <

Processing pico helicopter (platform: https://github.com/platformio/platform-raspberrypi.git; framework: arduino; board: pico)
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/raspberrypi/pico.html
PLATFORM: Raspberry Pi RP2040 (1.0.0+sha.095da74) > Raspberry Pi Pico
HARDWARE: RP2040 133MHz, 264KB RAM, 2MB Flash
DEBUG: Current (cmsis-dap) External (cmsis-dap, jlink, raspberrypi-swd)
PACKAGES:
 - framework-arduino-mbed 2.1.0
 - tool-rp2040tools 1.0.2
 - toolchain-gccarmnoneeabi 1.90201.191206 (9.2.1)
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 31 compatible libraries
Scanning dependencies...
No dependencies
Building in release mode
Compiling .pio\build\pico helicopter\src\main.cpp.o
Archiving .pio\build\pico helicopter\libFrameworkArduinoVariant.a
Compiling .pio\build\pico helicopter\FrameworkArduino\wiring_analog.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\wiring_digital.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\wiring_pulse.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\wiring_shift.cpp.o
src\main.cpp:3:17: error: no matching function for call to 'arduino::UART::UART(int, int)'
    3 | UART Serial2(4,5);
      |                 ^
In file included from C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Arduino.h:105,
                 from src\main.cpp:1:
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:42:3: note: candidate: 'arduino::UART::UART()'
   42 |   UART() {
      |   ^~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:42:3: note:   candidate expects 0 arguments, 2 provided
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:41:3: note: candidate: 'arduino::UART::UART(int, int, int, int)'
   41 |   UART(int tx, int rx, int rts, int cts) : _tx((PinName)tx), _rx((PinName)rx), _rts((PinName)rts), _cts((PinName)cts) {}
      |   ^~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:41:3: note:   candidate expects 4 arguments, 2 provided
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:39:7: note: candidate: 'constexpr arduino::UART::UART(const arduino::UART&)'
   39 | class UART : public HardwareSerial {
      |       ^~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:39:7: note:   candidate expects 1 argument, 2 provided
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:39:7: note: candidate: 'constexpr arduino::UART::UART(arduino::UART&&)'
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/Serial.h:39:7: note:   candidate expects 1 argument, 2 provided
*** [.pio\build\pico helicopter\src\main.cpp.o] Error 1
==================================================================================================== [FAILED] Took 5.55 seconds ====================================================================================================The terminal process "C:\Users\MS26\.platformio\penv\Scripts\platformio.exe 'run', '--environment', 'pico helicopter'" terminated with exit code: 1.

Terminal will be reused by tasks, press any key to close it.

But when i remove the line
UART Serial2(4,5);
will compile without any issues at all.

MNS26 · 2021-06-11T10:53:17Z

Is there anything else i can try to get it to work?
@facchinm do you have any idea why it does compile (but not work) when removing the UART Serial2(4,5); line?
Ive been trying things out in my free time here and there but i either fail to compile it (same thing as previous message) or the serial port is not made.

Should i see this project as a lost cause and "drop it"? or is there still a light somewhere at the end of the tunnel.

resolvethis · 2021-06-16T14:35:05Z

The proposed code did not compile as it was shown there.

UART Serial2(8, 9); // did not compile

I got the following error:

no matching function for call to 'arduino::UART::UART(int, int)'
...
note: candidate: arduino::UART::UART(int, int, int, int)

What worked for me was:

UART Serial2(8, 9, 0, 0);

Full code:

    #include <Arduino.h>
    
    UART Serial2(8, 9, 0, 0);
    
    void setup() {
      Serial2.begin(9600);
      // ...
      Serial2.write("hello world");
    }
    
    void loop {}

MNS26 · 2021-06-27T19:57:36Z

@resolvethis Did you also edit the pins_arduino.h file? When i try and use your code (and adding the () to loop) i still get a error.

Processing pico helicopter (platform: https://github.com/platformio/platform-raspberrypi.git; framework: arduino; board: pico)
----------------------------------------------------------------------------------------------------------------------------------------------------------------------Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/raspberrypi/pico.html
PLATFORM: Raspberry Pi RP2040 (1.1.0+sha.3c6cc84) > Raspberry Pi Pico
HARDWARE: RP2040 133MHz, 264KB RAM, 2MB Flash
DEBUG: Current (cmsis-dap) External (cmsis-dap, jlink, raspberrypi-swd)
PACKAGES:
 - framework-arduino-mbed 2.1.0
 - tool-rp2040tools 1.0.2
 - toolchain-gccarmnoneeabi 1.90201.191206 (9.2.1)
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 31 compatible libraries
Scanning dependencies...
Dependency Graph
|-- <TinyGPSPlus> 1.0.2
Building in release mode
Compiling .pio\build\pico helicopter\src\main.cpp.o
Compiling .pio\build\pico helicopter\libf0e\TinyGPSPlus\TinyGPS++.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduinoVariant\double_tap_usb_boot.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduinoVariant\variant.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\Interrupts.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\Serial.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\Tone.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\USB\PluggableUSBDevice.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\USB\USBCDC.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\USB\USBSerial.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\main.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\pinToIndex.cpp.o
In file included from C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_regs/include/hardware/platform_defs.h:12,
                 from C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2_common/pico_platform/include/pico/platform.h:12,
                 from C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/common/pico_base/include/pico.h:19,
                 from C:\Users\MS26\.platformio\packages\framework-arduino-mbed\variants\RASPBERRY_PI_PICO\double_tap_usb_boot.cpp:2:
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2_common/hardware_timer/include/hardware/timer.h: In function 'uint32_t time_us_32()':
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_regs/include/hardware/regs/addressmap.h:56:20: warning: type qualifiers ignored on cast result type [-Wignored-qualifiers]
   56 | #define TIMER_BASE 0x40054000
      |                    ^~~~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_structs/include/hardware/structs/timer.h:33:38: note: in expansion of macro 'TIMER_BASE'
   33 | #define timer_hw ((timer_hw_t *const)TIMER_BASE)
      |                                      ^~~~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2_common/hardware_timer/include/hardware/timer.h:66:12: note: in expansion of macro 'timer_hw'
   66 |     return timer_hw->timerawl;
      |            ^~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2_common/hardware_timer/include/hardware/timer.h: In function 'bool time_reached(absolute_time_t)':
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_regs/include/hardware/regs/addressmap.h:56:20: warning: type qualifiers ignored on cast result type [-Wignored-qualifiers]
   56 | #define TIMER_BASE 0x40054000
      |                    ^~~~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_structs/include/hardware/structs/timer.h:33:38: note: in expansion of macro 'TIMER_BASE'
   33 | #define timer_hw ((timer_hw_t *const)TIMER_BASE)
      |                                      ^~~~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2_common/hardware_timer/include/hardware/timer.h:110:19: note: in expansion of macro 'timer_hw'
  110 |     uint32_t hi = timer_hw->timerawh;
      |                   ^~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_regs/include/hardware/regs/addressmap.h:56:20: warning: type qualifiers ignored on cast result type [-Wignored-qualifiers]
   56 | #define TIMER_BASE 0x40054000
      |                    ^~~~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2040/hardware_structs/include/hardware/structs/timer.h:33:38: note: in expansion of macro 'TIMER_BASE'
   33 | #define timer_hw ((timer_hw_t *const)TIMER_BASE)
      |                                      ^~~~~~~~~~
C:\Users\MS26\.platformio\packages\framework-arduino-mbed\cores\arduino/mbed/targets/TARGET_RASPBERRYPI/TARGET_RP2040/pico-sdk/rp2_common/hardware_timer/include/hardware/timer.h:111:33: note: in expansion of macro 'timer_hw'
  111 |     return (hi >= hi_target && (timer_hw->timerawl >= (uint32_t) target || hi != hi_target));
      |                                 ^~~~~~~~
.pio\libdeps\pico helicopter\TinyGPSPlus\src\TinyGPS++.cpp: In member function 'bool TinyGPSPlus::encode(char)':
.pio\libdeps\pico helicopter\TinyGPSPlus\src\TinyGPS++.cpp:63:12: warning: this statement may fall through [-Wimplicit-fallthrough=]
   63 |     parity ^= (uint8_t)c;
      |     ~~~~~~~^~~~~~~~~~~~~
.pio\libdeps\pico helicopter\TinyGPSPlus\src\TinyGPS++.cpp:64:3: note: here
   64 |   case '\r':
      |   ^~~~
Compiling .pio\build\pico helicopter\FrameworkArduino\wiring.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\wiring_analog.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\wiring_digital.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\wiring_pulse.cpp.o
Compiling .pio\build\pico helicopter\FrameworkArduino\wiring_shift.cpp.o
Archiving .pio\build\pico helicopter\libFrameworkArduino.a
Linking .pio\build\pico helicopter\firmware.elf
c:/users/ms26/.platformio/packages/toolchain-gccarmnoneeabi/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld.exe: .pio\build\pico helicopter\libFrameworkArduino.a(Serial.cpp.o):(.bss._UART2_+0x0): multiple definition of `_UART2_'; .pio\build\pico helicopter\src\main.cpp.o:(.bss._UART2_+0x0): first defined here  
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\pico helicopter\firmware.elf] Error 1
==================================================================== [FAILED] Took 13.01 seconds ====================================================================
The terminal process "C:\Users\MS26\.platformio\penv\Scripts\platformio.exe 'run', '--environment', 'pico helicopter'" terminated with exit code: 1.

Terminal will be reused by tasks, press any key to close it.

but when i set #define SERIAL_HOWMANY to 1 it compiles without a problem.

MNS26 · 2021-07-31T09:12:28Z

@facchinm has there been any news on this issue? I have yet to find a way to use multiple serial ports at once.

aord · 2022-05-15T21:31:57Z

Many thanks to those above, especially facchinm:
Below is what I used for my NEO GPS connected to the Pico.
I had trouble with Serial1, every time I used Serial1 along with Serial it would lock up the PC comport. I'm guessing that serial1 is the same as serial? I don't know, but the following code worked for me:

#include <TinyGPSPlus.h>

TinyGPSPlus gps;

// The serial connection to the GPS device
UART Serial2(8,9);
//THE GPS TX goes to GP9 to work, 9 on the PICO to the recieve pin
//THE GPS TX goes to GP9 to work, 9 on the PICO to the recieve pin

void setup()
{
Serial.begin(9600);
Serial2.begin(9600); //You might be 4800 depending on your GPS?
}

void loop()
{

delay(500);
// This sketch displays information every time a new sentence is correctly encoded.
while (Serial2.available() > 0)
{
if (gps.encode(Serial2.read()))
displayInfo();
}

if (millis() > 5000 && gps.charsProcessed() < 10)
{
Serial.println(F("No GPS detected: check wiring."));
//while(true);
delay(7000);
Serial.println("Waited 7 sec for you to wire");
}
}

void displayInfo()
{
Serial.print(F("Location: "));
if (gps.location.isValid())
{
Serial.print(gps.location.lat(), 6);
Serial.print(F(","));
Serial.print(gps.location.lng(), 6);
}
else
{
Serial.print(F("INVALID"));
}

Serial.print(F(" Date/Time: "));
if (gps.date.isValid())
{
Serial.print(gps.date.month());
Serial.print(F("/"));
Serial.print(gps.date.day());
Serial.print(F("/"));
Serial.print(gps.date.year());
}
else
{
Serial.print(F("INVALID"));
}

Serial.print(F(" "));
if (gps.time.isValid())
{
if (gps.time.hour() < 10) Serial.print(F("0"));
Serial.print(gps.time.hour());
Serial.print(F(":"));
if (gps.time.minute() < 10) Serial.print(F("0"));
Serial.print(gps.time.minute());
Serial.print(F(":"));
if (gps.time.second() < 10) Serial.print(F("0"));
Serial.print(gps.time.second());
Serial.print(F("."));
if (gps.time.centisecond() < 10) Serial.print(F("0"));
Serial.print(gps.time.centisecond());
}
else
{
Serial.print(F("INVALID"));
}

Serial.println();
}

MNS26 changed the title ~~Raspberry pi pico unable to use 2nd or 3rd serial port (Serial1 or Serial2)~~ Raspberry pi pico unable to use 2nd serial port (Serial1) Apr 29, 2021

MNS26 changed the title ~~Raspberry pi pico unable to use 2nd serial port (Serial1)~~ Raspberry pi pico unable to use 2 hardware serial ports (Serial1&2) Apr 29, 2021

facchinm added RP2040 waiting for feedback labels May 27, 2021

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Raspberry pi pico unable to use 2 hardware serial ports (Serial1&2) #210

Raspberry pi pico unable to use 2 hardware serial ports (Serial1&2) #210

MNS26 commented Apr 28, 2021 •

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Gerriko commented May 25, 2021

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MNS26 commented Jun 11, 2021

resolvethis commented Jun 16, 2021

MNS26 commented Jun 27, 2021

MNS26 commented Jul 31, 2021

aord commented May 15, 2022

Raspberry pi pico unable to use 2 hardware serial ports (Serial1&2) #210

Raspberry pi pico unable to use 2 hardware serial ports (Serial1&2) #210

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MNS26 commented Apr 28, 2021 • edited Loading

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aord commented May 15, 2022

MNS26 commented Apr 28, 2021 •

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