VS Arduino - was not declared in this scope error

Sep 18^th, 2024 at 9:58am (UTC)

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VS Arduino › › › was not declared in this scope error

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was not declared in this scope error (Read 2938 times)

SVB Newbies Offline Posts: 2 Joined: Sep 13^th, 2018	was not declared in this scope error Sep 13^th, 2018 at 7:08am	Print Post
	I get an error in Atmel Studio while compiling the following code: #include "Debug_I2c.h" #include "Arduino.h" int i = 0; #include <Wire.h> void setup() { Wire.begin(2); // join i2c bus with address #2 Wire.onRequest(requestEvent); // register event pinMode(13, OUTPUT); Serial.begin(9600); while(!Serial); Serial.println("begin"); } void loop() { delay(100); Serial.println("test"); if(i++ > 5) { digitalWrite(13, !digitalRead(13)); i = 0; } } // function that executes whenever data is requested by master // this function is registered as an event, see setup() void requestEvent() { Wire.write("hello "); // respond with message of 6 bytes // as expected by master } Message in the output: Debug_I2c.cpp: In function void setup() Error compiling project sources Build failed for project 'Debug_I2c' Debug_I2c.cpp: 11:18: error: 'requestEvent' was not declared in this scope Wire.onRequest(requestEvent); \\ register event The code compiles fine in Arduino. Do I have to declare the 'requestEvent' somewhere else as well?


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Tim@Visual Micro Administrator Offline Posts: 12136 Location: United Kingdom Joined: Apr 10^th, 2010	Re: was not declared in this scope error Reply #1 - Sep 13^th, 2018 at 10:56am	Print Post
	You might not be using visual micro and arduino. This looks like it might be a native atmel build. you need to post the full build output when posting errors. Does the same code build in the arduino ide?


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SVB Newbies Offline Posts: 2 Joined: Sep 13^th, 2018	Re: was not declared in this scope error Reply #2 - Sep 13^th, 2018 at 11:15am	Print Post
	Here is the full build output: Compiling 'Debug_I2c' for 'Adafruit Metro M4 (SAMD51)' Build Folder: etro_m4/Debug" Summary: Header=1 Prototypes=1 Imports=0 Additional Defines: Architecture Tools: abi-gcc/4.8.3-2014q1/bin/" Api: 1.1806.1-5 Sketch Book: "file:///C:/Users/user/Documents/Arduino" Using Debug_I2c.cpp as the intial project code Sketch Include Paths Core Include Paths Include Path .2.3/cores/arduino" Include Path .2.3/variants/metro_m4" Deep search for libraries ... 4.8.3-2014q1\bin\arm-none-eabi-g++" -mcpu=cortex-m4 -mthumb -c -g -Os -w -std=gnu++11 -ffunction-sections -fdata-sections -fno-threadsafe-statics -nostdlib --param max-inline-insns-single=500 -fno-rtti -fno-exceptions -w -x c++ -E -CC -g -DF_CPU=120000000L -DARDUINO=10805 -DARDUINO_METRO_M4 -DARDUINO_ARCH_SAMD -D__SAMD51J19A__ -DADAFRUIT_METRO_M4_EXPRESS -D__SAMD51__ -DUSB_VID=0x239A -DUSB_PID=0x8020 -DUSBCON -DUSB_MANUFACTURER="\"Adafruit LLC\"" -DUSB_PRODUCT="\"Adafruit Metro M4\"" -D__FPU_PRESENT -DARM_MATH_CM4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DENABLE_CACHE S/Include/" 0/CMSIS/Device/ATMEL/" ores\arduino" ariants\metro_m4" "C:\Users\user\Documents\Arduino\Debug_I2c\Debug_I2c.cpp" -o "nul" 4.8.3-2014q1\bin\arm-none-eabi-g++" -mcpu=cortex-m4 -mthumb -c -g -Os -w -std=gnu++11 -ffunction-sections -fdata-sections -fno-threadsafe-statics -nostdlib --param max-inline-insns-single=500 -fno-rtti -fno-exceptions -w -x c++ -E -CC -g -DF_CPU=120000000L -DARDUINO=10805 -DARDUINO_METRO_M4 -DARDUINO_ARCH_SAMD -D__SAMD51J19A__ -DADAFRUIT_METRO_M4_EXPRESS -D__SAMD51__ -DUSB_VID=0x239A -DUSB_PID=0x8020 -DUSBCON -DUSB_MANUFACTURER="\"Adafruit LLC\"" -DUSB_PRODUCT="\"Adafruit Metro M4\"" -D__FPU_PRESENT -DARM_MATH_CM4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DENABLE_CACHE S/Include/" 0/CMSIS/Device/ATMEL/" ores\arduino" ariants\metro_m4" ibraries\Wire" "C:\Users\user\Documents\Arduino\Debug_I2c\Debug_I2c.cpp" -o "nul" Using previous search results: aries\Wire\Wire.cpp Building variant ... Using previously compiled variant Building core ... Building libraries ... Using library Wire version 1.0 in folder .2.3/libraries/Wire" Using previously compiled file: ebug\Wire\Wire.cpp.o Building project code ... 4.8.3-2014q1/bin/arm-none-eabi-g++" -mcpu=cortex-m4 -mthumb -c -g -Os -w -std=gnu++11 -ffunction-sections -fdata-sections -fno-threadsafe-statics -nostdlib --param max-inline-insns-single=500 -fno-rtti -fno-exceptions -MMD -g -DF_CPU=120000000L -DARDUINO=10805 -DARDUINO_METRO_M4 -DARDUINO_ARCH_SAMD -D__SAMD51J19A__ -DADAFRUIT_METRO_M4_EXPRESS -D__SAMD51__ -DUSB_VID=0x239A -DUSB_PID=0x8020 -DUSBCON -DUSB_MANUFACTURER="\"Adafruit LLC\"" -DUSB_PRODUCT="\"Adafruit Metro M4\"" -D__FPU_PRESENT -DARM_MATH_CM4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DENABLE_CACHE S/Include/" 0/CMSIS/Device/ATMEL/" -I"C:\Users\user\Documents\Arduino\Debug_I2c" ores\arduino" ariants\metro_m4" ibraries\Wire" -I"C:\Program Files (x86)\Arduino\libraries" -I"C:\Users\user\Documents\Arduino\libraries" -I"C:\Program Files (x86)\Atmel\Studio\7.0\Extensions\bu5kipiw.4jy\Micro Platforms\default\debuggers" ibraries" "C:\Users\user\Documents\Arduino\Debug_I2c\Debug_I2c.cpp" -o Debug\Debug_I2c.cpp.o" Debug_I2c.cpp: In function void setup() Error compiling project sources Build failed for project 'Debug_I2c' Debug_I2c.cpp: 11:18: error: 'requestEvent' was not declared in this scope Wire.onRequest(requestEvent); \\ register event


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Tim@Visual Micro Administrator Offline Posts: 12136 Location: United Kingdom Joined: Apr 10^th, 2010	Re: was not declared in this scope error Reply #3 - Sep 13^th, 2018 at 11:50am	Print Post
	Thanks, The problem is that an arduino project is compiled in a temp folder. All the .ino code is merged into temp\Debug_I2c.cpp then built. Because you have added a file called Debug_I2c.cpp to the real project this is taken as an indicator that you want to override normal arduino .ino code. Rename the Debug_I2c.cpp to something other than the name of the project and it will be ok


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