cpointerswarningscompiler-warningsmplab-c18

Suspcicious pointer conversion warning

I'm compiling my C code using Microchip's C18 compiler. I'm getting a warning [2054] suspicious pointer conversion in this code:

unsigned char ENC_MAADR1 = 0x65;
unsigned char ENC_ReadRegister(unsigned char address);
// ...
puts(ENC_ReadRegister(ENC_MAADR1)); // <-- warning on this line

What does this warning mean and how can I solve it?

Solution

  • puts requires const char*, you are delivering unsigned char, not even a pointer.

    From here:

    #include <stdio.h> 

int puts(const char *s);

    The puts() function writes the string pointed to by s to standard output stream stdout and appends a newline character to the output. The string's terminating null character is not written.

    Use putc(int c, FILE* stream) instead... See here for a reference.

    Thank you for the annotations!!