Gerriko
commented
3 years ago 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
MNS26
resolvethis
aord
I was redirected here form platfromIO to open an issue about it. ( https://github.com/platformio/platform-raspberrypi/issues/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