I am now having a problem with SPI interface of the Xplain demo board.
As you all know, SPI is quite a simple interface. I am using the one at PORTC and have configured its interrupt level as 0, MOSI as output, MISO as input, Clock as output, SS as output and used it as master. In fact I have used the same settings with other boards, and they worked well. :oops:
There is already byte output at MOSI in a correct frequency and the SS runs also correctly, however, there is no clock output! i.e. As the data comes out, the clock signal(SCK) does NOT come out synchronously. It remains high. :roll: As a result, the slave module can not be driven.
As I have tested, this SS pin is physically OK.
It seems sooo strange to me. Could someone please give some tip to figure it out? Thanks!