Multiple Instances of SPI doesn't seem to be working.

RE: Multiple Instances of SPI doesn't seem to be working.

scla — Mon, 20 May 2019 22:51:57 GMT

Hi, I think I am running into this same issue. I know your post is several months old, but any chance you have this resolved? I noticed that when I compile the application with the optimizer set to "Debug" instead of "Optimize for size" (or levels 1-3), everything works fine. If I at all have gcc optimize, it looks like data sent to peripheral A is going to peripheral B.

RE: Multiple Instances of SPI doesn't seem to be working.

Kenneth — Wed, 05 Dec 2018 15:00:00 GMT

How about using a 1kohm serie resistor in series with the MISO pin?

Best regards,
Kenneth

RE: Multiple Instances of SPI doesn't seem to be working.

Rajat — Wed, 05 Dec 2018 06:42:18 GMT

So far we are not using the Epaper, But still i would like to let you know that

The problem was whenever i remove the Epaper, then CAN Works

But whenever i connect the epaper , CAN initalization gets failed.

I saw on logic analyzer which showed me that Epaper was causing the BUSY(MISO) pin to be low and hence instead of data that was supposed to be on MISO Lines , it became 0 .

So CAN Initilazation failed.

Do You have any workaround for this in your mind?

Thanks!

RE: Multiple Instances of SPI doesn't seem to be working.

Kenneth — Wed, 21 Nov 2018 13:21:25 GMT

[quote user="Rajat"]But when i connect the epaper , CAN module doesn't get initalised.[/quote]

If you look at a logic analyzer plot between the two you can see what difference?

Maybe if you do a dump of the SPI configuration registers with and without the epaper you can identify the difference?

RE: Multiple Instances of SPI doesn't seem to be working.

Rajat — Wed, 21 Nov 2018 05:12:55 GMT

No, They are not overlapping with other peripherals.

This is what is happening now.

If i remove the Epaper from the hardware and test, it works fine.

But when i connect the epaper , CAN module doesn't get initalised.

RE: Multiple Instances of SPI doesn't seem to be working.

Kenneth — Mon, 01 Oct 2018 18:00:57 GMT

Hi,

Have you checked that the SPI instances (0 and 2) you are using are not overlapping with other peripherals you may have enabled:
http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52840.ps/memory.html?cp=2_0_0_3_1_3#topic

Are you able to replicate this by simply extending the SDK example to use instance 0 and 2?
Try \nRF5_SDK_15.2.0_9412b96\nRF5_SDK_15.2.0_9412b96\examples\peripheral\spi\

E.g. in main.c add:
static const nrf_drv_spi_t spi2 = NRF_DRV_SPI_INSTANCE(2); /**< SPI instance 2. */ // #define SPI2_ENABLED 1 in sdk_config.h

Best regards,
Kenneth

RE: Multiple Instances of SPI doesn't seem to be working.

Rajat — Fri, 28 Sep 2018 10:54:50 GMT

On a logic analyzer on epaper pins , it shows me that "The inital idle state of clk line does not match the settings"

RE: Multiple Instances of SPI doesn't seem to be working.

Rajat — Fri, 28 Sep 2018 07:16:26 GMT

Except the CS pin , all other pins are same. Now i changed

RE: Multiple Instances of SPI doesn't seem to be working.

Rajat — Fri, 28 Sep 2018 06:24:42 GMT

Also

I am using SPI instance 0 for Epaper

SPI Instance 2 for CAN

TWI instance 1 for an I2C Sensor (Because SPI and TWI are shared resources, if i am not wrong)

RE: Multiple Instances of SPI doesn't seem to be working.

Rajat — Fri, 28 Sep 2018 04:42:24 GMT

The pins for Epaper and Can bus Module are entirely different
(Just in case it helps )