nRF51822 SPI Module RX

RE: nRF51822 SPI Module RX

Hung Bui — Fri, 10 Jan 2014 14:36:42 GMT

@Modern Advice: P0.22 is physically pin 41 on the QFN chip and B5 on the WLCSP chip. You can find the pin assignment in the nRF51822 Product Specification document at Section 2.2.

RE: nRF51822 SPI Module RX

Charles Horkin — Thu, 09 Jan 2014 18:35:10 GMT

I mean that pin number 22 is not the same as P0.22. The P0.x pins that the firmware refrences are mapped to different physical pins with other numbers.

RE: nRF51822 SPI Module RX

Cagdas Ogut — Thu, 09 Jan 2014 04:39:04 GMT

I am stuck and SPI as well. What do you mean by P0.22 != P22 ?

I cannot even see SPI clock on my oscilloscope.

Thanks in advance.

RE: nRF51822 SPI Module RX

Hung Bui — Thu, 31 Oct 2013 18:48:33 GMT

Balaji, Could you please upload your project files ?

RE: nRF51822 SPI Module RX

Charles Horkin — Thu, 31 Oct 2013 17:34:02 GMT

What about if you short 21 and 23 together? Also, are you shorting pin 20, or P0.21 to pin 22, or P0.22? Note that P0.22 != P22.

RE: nRF51822 SPI Module RX

balaji — Thu, 31 Oct 2013 07:30:28 GMT

Hi Hung Bui,

I have pca10001 board eva board.

i tried spi communication by spi_master_example in nrf6310 source code.

i shorted 20(MOSI) to 22 pin(MISO) . i change ERROR_PIN_SPI0 =18 ERROR_PIN_SPI1=19.

But for every byte i am sending ,i am receiving data byte as 0xFF.

Kindly suggest me.

Regards Balaji

RE: nRF51822 SPI Module RX

Hung Bui — Fri, 25 Oct 2013 14:17:30 GMT

@Charles: If you don't read the byte out, you will be able to send maximum 2 bytes since the SPI RX buffer is only 2 bytes. The figure in the Reference Manual showed that the first byte was clocked out before the third one came.

RE: nRF51822 SPI Module RX

Charles Horkin — Thu, 24 Oct 2013 19:06:26 GMT

Follow-up: The Reference manual shows 3 TXd bytes followed by a pause followed by more...but when I do it, I get 2, then 2, then more....am I missing something?

RE: nRF51822 SPI Module RX

Charles Horkin — Thu, 24 Oct 2013 18:09:10 GMT

That fixed it. I guess I failed to see that the crystal was there....thanks!

RE: nRF51822 SPI Module RX

Hung Bui — Thu, 24 Oct 2013 10:56:21 GMT

Hi Charles,

Have you tried spi_master_example in folder nRF6310 ? It was made for the Dev Kit, You would need to modify the source code a little bit for the PCA10001. Mainly the LEDs configuration.

Note that on the PCA10001 P0.08->P0.11 are used for UART and P0.26 and P0.27 are connected to 32kHz crystal. If you want to use these pins, you would need to cut the solder bridges.

If SPI1 and SPI0 working properly and be looped back properly (connected MOSI and MISO), ERROR_PIN_SPI0 and ERROR_PIN_SPI1 should be low (both LEDs are off).

Please upload your source code if you still experience the issue.

RE: nRF51822 SPI Module RX

guillermo — Thu, 24 Oct 2013 00:29:32 GMT

Hi Charles, I'm shooting in the dark here because I haven't dive into hardware configurations yet, but it seems like a signal conditioning issue. Are you sure that your input pin is correctly configured as High Z or open collector with a pull up? is an enable signal to allow the pin to connect to the internal bus?