Managing 24bit data with MSP430 16 bit

Saretta Bellina

Hi,

I'm really new with microcontroller.

My question is how to manage 24 bit data (for example from a 24 bit sigma delta ADC) if the microcontroller bus is 16 bit?

Thank you
Saretta

over 14 years ago

0 Piergiuseppe Tundo over 14 years ago

Genius 3155 points

Normally, an external ADC has some serial interface (e.g. SPI), where the 24-bit sample will probably read as 3 consecutive bytes (typically from most to least significant ).... anyway the MSP430 C type (unsigned) long is 32 bits wide, so you can store the value of the sample in a variable like this:

unsigned long sample = first_byte << 16 + second_byte << 8 + third_byte;

Regards.

Peppe

0 Saretta Bellina over 14 years ago in reply to Piergiuseppe Tundo

Prodigy 60 points

Thaks Peppe!

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Managing 24bit data with MSP430 16 bit