Hi Xilinx,
Vivado SDK 2015.4, zedboard, SPI1, PMOD JE
Struggle with SDK spi loopback test on zedboard by directly connecting MISO and SOMI pins.
I modified xspi_polled_example.c from /opt/Xilinx/SDK/2015.4/data/embeddedsw/XilinxProcessorIPLib/drivers/spi_v4_1/examples
1 ConfigPtr = XSpi_LookupConfig(SpiDeviceId);
2 XSpi_CfgInitialize(SpiInstancePtr, ConfigPtr, ConfigPtr->BaseAddress);
3 XSpi_SetOptions(SpiInstancePtr, (XSP_MASTER_OPTION | XSP_CLK_ACTIVE_LOW_OPTION |
XSP_CLK_PHASE_1_OPTION) | XSP_MANUAL_SSELECT_OPTION);
4 XSpi_Start(SpiInstancePtr);
5 XSpi_IntrGlobalDisable(SpiInstancePtr);
6 XSpi_Transfer(SpiInstancePtr, WriteBuffer, ReadBuffer, 4);
XSpi_Transfer simply flies away, and c program hangs.
My questions:
1. I measured signal SS (pin 1) always high. Loopback test doesn't have a slave device. Do I need to drive down SS pin, and How?
2. Is it still necessary for interrupt handling, since this is just a loopback test?
3. Please also advise on XSpi_SetOptions of an external loopback.
Thanks in advance.
Mike
