How to access low and high bytes of a 16-bit data.

Vikram JHURRY

Other Parts Discussed in Thread: CC2538

Hello,

I am using the Ambient light sensor(ALS) example for the SmartRF06 wich cc2538. I want to send the data on a radio packet.

However the ALS data is 16 bit while the packet padding (as in PER test example) is 88 8-bit data bytes. How do I allocate High byte of ALS data to packet.padding[10] for example and low byte to packet.padding[11].

By the way is there a manual for all C instructions that can be used on ARM mcus?

Thanks,

Vikram.

over 9 years ago

0 Robert Adsett72 over 9 years ago

Guru 10570 points

The C instructions for ARM micros are the same as for other micros, that's what has helped make C so useful.

There are compiler specific extensions and extended libraries but even they are relatively limited.

Accessing a char array is the same on an ARM micro as on a PC

Robert

0 Amit Ashara over 9 years ago

TI__Guru**** 244400 points

Hello Vikram,

Well a simple assignment operator would be OK.

packet.padding[11] = lo_byte;
packet.padding[10] = hi_byte;

Regards
Amit

0 Vikram JHURRY over 9 years ago in reply to Amit Ashara

Prodigy 220 points

Hello Amit,

The assignment is OK - I was looking for a way to extract the first byte and second byte from the 16bit value.

I got this from stackoverflow:

int x = (number >> (8*n)) & 0xff;

where n is 0 for the first byte, 1 for the second byte, etc.

I am testing it.

Regards.

Vikram

Arm-based microcontrollers

Arm-based microcontrollers forum

How to access low and high bytes of a 16-bit data.