pass macro definition to function taking reference as an argument

Question

How can we pass a #defined macro to the function as an argument where the function accepts reference.

This is what I am trying the wrong way:

#define RST_REQ_REG 0x04
#define RESET_CMD   0x01

write_register(RST_REQ_REG, RESET_CMD, 1);


// Decleration of write_reg is
void write_register(uint8_t regAddr, uint8_t *writeByte, uint8_t writeByteLen);

Thanks !

Answer 1

You can't. write_register accepts a pointer as second argument, period.

You probably want this:

#define RST_REQ_REG 0x04
#define RESET_CMD   0x01

uint8_t cmdbuffer[1] = {command};

write_register(RST_REQ_REG, cmdbuffer, 1);

Maybe you want to wrap this into another function:

void write_command(uint8_t regAddr, uint8_t command)
{
   uint8_t cmdbuffer[1] = {command};
   write_register(regAddr, cmdbuffer, 1);
}

...
write_command(RST_REQ_REG, RESET_CMD);