"warning: narrowing conversion" warning error

[alexruffell]

I keep getting this warning and do not know how to fix it. I don't believe it is due to anything I may have done as I reused the code as-is.

In file included from src/main.cpp:107:
src/ld2410_uart.h: In member function 'void LD2410::setConfigMode(bool)':
src/ld2410_uart.h:217:27: warning: narrowing conversion of '(enable ? 255 : 254)' from 'int' to 'char' inside { } [-Wnarrowing]
     char cmd[2] = {enable ? 0xFF : 0xFE, 0x00};
                    ~~~~~~~^~~~~~~~~~~~~
src/ld2410_uart.h: In member function 'void LD2410::setEngineeringMode(bool)':
src/ld2410_uart.h:245:27: warning: narrowing conversion of '(enable ? 98 : 99)' from 'int' to 'char' inside { } [-Wnarrowing]
     char cmd[2] = {enable ? 0x62 : 0x63, 0x00};
                    ~~~~~~~^~~~~~~~~~~~~
In file included from src/main.cpp:107:
src/ld2410_uart.h: In member function 'void LD2410::setBaudrate(int)':
src/ld2410_uart.h:273:33: warning: narrowing conversion of 'index' from 'int' to 'char' inside { } [-Wnarrowing]
     char value[2] = {index, 0x00};
                                 ^

The warning above happens when leaving the framework to the default arduino. Since the code appears to crash my ESP32, I tried IDF and it is now causing the compiler to fail:

In file included from src/main.cpp:93:
src/ld2410_uart.h: In member function 'void LD2410::sendCommand(char*, char*, int)':
src/ld2410_uart.h:46:16: error: 'lowByte' was not declared in this scope
     write_byte(lowByte(len));
                ^~~~~~~
src/ld2410_uart.h:47:16: error: 'highByte' was not declared in this scope
     write_byte(highByte(len));
                ^~~~~~~~
src/ld2410_uart.h: In member function 'void LD2410::setConfigMode(bool)':
src/ld2410_uart.h:217:27: error: narrowing conversion of '(enable ? 255 : 254)' from 'int' to 'char' inside { } [-Werror=narrowing]
     char cmd[2] = {enable ? 0xFF : 0xFE, 0x00};
                    ~~~~~~~^~~~~~~~~~~~~
src/ld2410_uart.h: In member function 'void LD2410::setEngineeringMode(bool)':
src/ld2410_uart.h:245:27: error: narrowing conversion of '(enable ? 98 : 99)' from 'int' to 'char' inside { } [-Werror=narrowing]
     char cmd[2] = {enable ? 0x62 : 0x63, 0x00};
                    ~~~~~~~^~~~~~~~~~~~~
src/ld2410_uart.h: In member function 'void LD2410::setMaxDistancesAndNoneDuration(int, int, int)':
src/ld2410_uart.h:252:35: error: 'lowByte' was not declared in this scope
     char value[18] = {0x00, 0x00, lowByte(maxMovingDistanceRange), highByte(maxMovingDistanceRange), 0x00, 0x00, 0x01, 0x00, lowByte(maxStillDistanceRange), highByte(maxStillDistanceRange), 0x00, 0x00, 0x02, 0x00, lowByte(noneDuration), highByte(noneDuration), 0x00, 0x00};
                                   ^~~~~~~
src/ld2410_uart.h:252:68: error: 'highByte' was not declared in this scope
     char value[18] = {0x00, 0x00, lowByte(maxMovingDistanceRange), highByte(maxMovingDistanceRange), 0x00, 0x00, 0x01, 0x00, lowByte(maxStillDistanceRange), highByte(maxStillDistanceRange), 0x00, 0x00, 0x02, 0x00, lowByte(noneDuration), highByte(noneDuration), 0x00, 0x00};
                                                                    ^~~~~~~~
In file included from src/main.cpp:93:
src/ld2410_uart.h: In member function 'void LD2410::setBaudrate(int)':
src/ld2410_uart.h:273:33: error: narrowing conversion of 'index' from 'int' to 'char' inside { } [-Werror=narrowing]
     char value[2] = {index, 0x00};
                                 ^

[DavidSack]

I am seeing the same thing except it does not seem to crash my ESP32.

[elchanly]

I stepped into something similar when changing arduino to espidf.
My log: In file included from src/main.cpp:84: src/ld2410_uart.h: In member function 'void LD2410::sendCommand(char*, char*, int)': src/ld2410_uart.h:46:16: error: 'lowByte' was not declared in this scope write_byte(lowByte(len)); ^~~~~~~ src/ld2410_uart.h:47:16: error: 'highByte' was not declared in this scope write_byte(highByte(len)); ^~~~~~~~ src/ld2410_uart.h: In member function 'void LD2410::setConfigMode(bool)': src/ld2410_uart.h:217:27: error: narrowing conversion of '(enable ? 255 : 254)' from 'int' to 'char' inside { } [-Werror=narrowing] char cmd[2] = {enable ? 0xFF : 0xFE, 0x00}; ~~~~~~~^~~~~~~~~~~~~ src/ld2410_uart.h: In member function 'void LD2410::setEngineeringMode(bool)': src/ld2410_uart.h:245:27: error: narrowing conversion of '(enable ? 98 : 99)' from 'int' to 'char' inside { } [-Werror=narrowing] char cmd[2] = {enable ? 0x62 : 0x63, 0x00}; ~~~~~~~^~~~~~~~~~~~~ src/ld2410_uart.h: In member function 'void LD2410::setMaxDistancesAndNoneDuration(int, int, int)': src/ld2410_uart.h:252:35: error: 'lowByte' was not declared in this scope char value[18] = {0x00, 0x00, lowByte(maxMovingDistanceRange), highByte(maxMovingDistanceRange), 0x00, 0x00, 0x01, 0x00, lowByte(maxStillDistanceRange), highByte(maxStillDistanceRange), 0x00, 0x00, 0x02, 0x00, lowByte(noneDuration), highByte(noneDuration), 0x00, 0x00}; ^~~~~~~ src/ld2410_uart.h:252:68: error: 'highByte' was not declared in this scope char value[18] = {0x00, 0x00, lowByte(maxMovingDistanceRange), highByte(maxMovingDistanceRange), 0x00, 0x00, 0x01, 0x00, lowByte(maxStillDistanceRange), highByte(maxStillDistanceRange), 0x00, 0x00, 0x02, 0x00, lowByte(noneDuration), highByte(noneDuration), 0x00, 0x00}; ^~~~~~~~ In file included from src/main.cpp:84: src/ld2410_uart.h: In member function 'void LD2410::setBaudrate(int)': src/ld2410_uart.h:273:33: error: narrowing conversion of 'index' from 'int' to 'char' inside { } [-Werror=narrowing] char value[2] = {index, 0x00}; ^ Compiling .pioenvs/bano/bootloader_support/src/flash_encrypt.o Compiling .pioenvs/bano/bootloader_support/src/secure_boot.o Compiling .pioenvs/bano/bootloader_support/src/flash_partitions.o Compiling .pioenvs/bano/bootloader_support/src/flash_qio_mode.o Compiling .pioenvs/bano/bootloader_support/src/bootloader_flash_config_esp32.o Compiling .pioenvs/bano/bootloader_support/src/bootloader_efuse.o Compiling .pioenvs/bano/bootloader_support/src/idf/bootloader_sha.o cc1plus: some warnings being treated as errors Compiling .pioenvs/bano/bt/controller/esp32/bt.o *** [.pioenvs/bano/src/main.o] Error 1

My pins are 16 and 17 and im using NodeMCU-32s
I've to also tell that, when on arduino, platform warnings just appeared but could compile and it worked, in fact thats what i have now working flawlessly