LAUNCHXL-CC1310: Need Suggestion for the Multiple SPI slave on a single SPI bus.

Abhay Singh

Prodigy 50 points

Part Number: LAUNCHXL-CC1310
Other Parts Discussed in Thread: CC1310

Hello,

I am looking for some examples of multiple SPI slaves on a single SPI bus with CC1310.

I am planning to use MCP23S08(IO expander) and external Winbond flash(w25q80dv) on a single SPI bus.

Thanks and regards,

Abhay

over 2 years ago

0 TER over 2 years ago

TI__Guru**** 317180 points

We have a SPI example but we don't have an example where more than one SPI slave is connected to the but.

For what you want to do you have to set up the driver to not drive the CSn (SS) line (3 pin SPI). If you have 3 slaves, numbered 1, 2, 3, you have to setup 3 DIO pins to be used as CSn for these slaves. If you want to use slave 2, you first set the CSn (DIO connected to slave 2) to the wanted level , open and use the driver to write/ read data to/ from the slave and then reset the CSn line. To set/ unset the CSn/ DIO, use the GPIO or PIN driver.

0 Abhay Singh over 2 years ago in reply to TER

Prodigy 50 points

Thanks for replying TER.

TER said:
For what you want to do you have to set up the driver to not drive the CSn (SS) line (3 pin SPI). If you have 3 slaves, numbered 1, 2, 3, you have to setup 3 DIO pins to be used as CSn for these slaves. If you want to use slave 2, you first set the CSn (DIO connected to slave 2) to the wanted level , open and use the driver to write/ read data to/ from the slave and then reset the CSn line. To set/ unset the CSn/ DIO, use the GPIO or PIN driver.

Ok, I got this part.

But is there any available example or reference for the Multiple SPI slave on a single bus specifically with one slave as Flash?