SPI master intrrupt

[Tim_Shih]

Dear Receive, 

In SPI communication, 

# if MCU is a SPI master, SPI master transmits data to SPI slave and then SPI slave replied at the same time.

# I mean SPI master must transmit data first and SPI slave replied. SPI slave will not transmit data first to SPI slave.

I feel a little confuse about  in what situation SPI master needs interrupt ?! 

Thank you so much.

[Len_CONSULTRON · Accepted solution]

Tim,

SPI does not require interrupts to operate.

You can use polling which has the CPU wait for each SPI transaction.   

However, more CPU-efficient method would be interrupts.  This reduces the load on the CPU.

Interrupts are used if you need to operate the SPI at maximum speed.  Otherwise, polling should be sufficient.

[Tim_Shih]

thank you