I have now used the #include <SoftwareSerial.h> with this ini file on platformIO

To make it work I load code over usb interface then switch to USB to ttl dongle and read rx tx over serial monitor.

I would like to use //#include <DigiCDC.h> //serial monitor
But this one i cant get to work. Does not detect com port

[env:attiny88]
platform = atmelavr
board = attiny88
framework = arduino
board_build.f_cpu = 16000000L
build_flags = -DCLOCK_SOURCE=18 -Wno-narrowing
upload_protocol = micronucleus
lib_deps =
featherfly/SoftwareSerial@^1.0

Code:

// this works, must use USB to ttl adapter and tx is Rx on the out and inpins
const byte rxPin = 3 ; // RX is D3 - on TTL it is TX
const byte txPin = 4 ; // TX is D4 - on TTL it is RX

SoftwareSerial mySerial(rxPin, txPin);

void setup() {
pinMode(rxPin, INPUT);
pinMode(txPin, OUTPUT);

mySerial.begin(9600);
mySerial.println("Initializing...");
}

void loop (){
mySerial.println("Test\n");
delay(1000);
}

Guys, I have problem with the serial monitor I cant get it to work
::

I have this ini file
::

any suggestions ??

I have solved it , this is my settings in platformIO.ini file:
[env:attiny88]
platform = atmelavr
board = attiny88
framework = arduino
board_build.f_cpu = 16000000L

; change clock source if needed
build_flags = -DCLOCK_SOURCE=18
; new clock source
;build_flags = -DCLOCK_SOURCE=17

upload_protocol = micronucleus

//////////////////////
also I needed to download
https://zadig.akeo.ie/#google_vignette
used this driver :
Ibusb-win32 (v1.2.6.0)

//////////////////
check this tutorial :

https://www.youtube.com/watch?v=NiRAF8N1JBU

//////////////
end of message

Hi guys I have this Attiny88 board but can not get it to work with the PlatformIO interface.
The Red LED is flashing when powered on via usb cable.

I get this Error :
C:\Users\johna.platformio\packages\framework-arduino-avr-attiny\cores\tiny\wiring.c: In function 'init':
C:\Users\johna.platformio\packages\framework-arduino-avr-attiny\cores\tiny\wiring.c:1095:8: error: #error "Frequency requested from internal oscillator that cannot be generated by prescaling"
#error "Frequency requested from internal oscillator that cannot be generated by prescaling"
^~~~~
Compiling .pio\build\attiny88\FrameworkArduino\wiring_pulse.c.o
C:\Users\johna.platformio\packages\framework-arduino-avr-attiny\cores\tiny\wiring.c:1096:8: error: #error "Custom tuning is not supported in the current version of ATTinyCore"
#error "Custom tuning is not supported in the current version of ATTinyCore"

Kindest any suggestions ??