Is that possible to build a SPI master/slave bus using SSP0/SSP1 on one board?

lpcware — Wed, 15 Jun 2016 18:52:10 GMT

Content originally posted in LPCWare by stanley76726 on Fri Oct 19 20:59:49 MST 2012
Hello!

For checking whether the SPI bus on LPC4357 is available, I am trying to use SSP0 as a master and SSP1 as a slave on the same board (MCB4300).

At first, I ran the Ssp_Master sample and check the waveforms (SCK, SSEL, and MOSI) from a oscilloscope, it seemed to work as expected.

But since I am unsure whether the MISO/MOSI can receive data correctly and have only one board, I want to built a SPI master/slave bus on one board, as titled.

Therefore, I combined both Ssp_Master and Ssp_Slave samples into a progrom.

My problem is that:

When I was debugging using Keil uVision4, the SSP Data Register (SSPx->DR) was wrote to some wrong values. Take Ssp_Master as an example, when it went in SSP_ReadWrite() -> SSP_SendData(), the value of SSPx->DR was set to 0x80 or 0xFF, not 0x01~0x3F as I expected. On the other hand, the SSP Status Register SSPx->SR was always 0x00000003 (meant to Transmit FIFO Empty(TFE) and Transmit FIFO Not Full(TNF)), SSPx->SR should be written to 0x00000000 or 0x00000002 when the FIFO is full or is sent 1-7 data frame(s), isn't it?

Anyone have already run Ssp_Master/Ssp_Slave sampels on LPC43xx boards, or had similar experience? Share with me please!

Re: Is that possible to build a SPI master/slave bus using SSP0/SSP1 on one board?

lpcware — Wed, 15 Jun 2016 18:52:11 GMT

Content originally posted in LPCWare by stanley76726 on Wed Nov 07 05:29:54 MST 2012
Answering my own question: It is feasible!

For anyone who are facing similar problems, please view some related discussion on http://www.lpcware.com/showthread.php?t=2803

LPC MicrocontrollersのトピックIs that possible to build a SPI master/slave bus using SSP0/SSP1 on one board?

Is that possible to build a SPI master/slave bus using SSP0/SSP1 on one board?

Re: Is that possible to build a SPI master/slave bus using SSP0/SSP1 on one board?