function call

Hi,

I am a little confused by the following example:

portCHAR myaddress = 0xFF;
ReadRegister(myaddress);
void ReadRegister(portSHORT address);

The compiler isn't giving me a warning for using a portCHAR(8 bit) as a
parameter when portSHORT(16 bit) is used.
But even though I expected the compiler to do "something" and assign
0x00FF to address, this was not the case.
Inside the function ReadRegister "address" is 0x??FF with ?? being
something undeterministic.
It is not "auto-casting" to 0x00FF.
I am fine with this functionality ... but I don't get it why there is
no compiler warning.
Any ideas?

thanks in advance

Juergen

I am using
cpu: MSP430xF1611
gcc: msp430-gcc 3.3.6
gdb: msp430-gdb 5.1.1
OS: linux
embedded OS: freeRTOS

.

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