SPI MQX 3.6

JaimeR — Fri, 24 Sep 2010 00:39:22 GMT

Hi,

I have a doubt concerning SPI driver, this is the situation:

-MCF52259

-MQX 3.6

-I need to control 3 SPI devices, one of the uses QSPI_PCS0 Pin and the other two devices use GPIO.

I understand I must use IO_IOCTL_SPI_SET_CS_CALLBACK in order to call a customized function and control Chip Select automatically.

Does this mean I must open 3 SPI drivers so that I can use a specific routine to control each chip select pin? or

How do I indicate which pin should the callback function activate/deactivate?

I already checked the SPI example but since it only used ONE spi device I don't know how to indicate which device should be active.

Thank you

Re: SPI MQX 3.6

PetrM — Fri, 24 Sep 2010 20:28:20 GMT

The relation is 1 SPI driver <=> N SPI devices.

Check the spi example again, search for "callback". You can extend this section for more callbacks and/or CSs.

There's a MASK for every callback function, which is bitfield of CS definitions passed to IO_IOCTL_SPI_SET_CS.

So when you IO_IOCTL_SPI_SET_CS in the runtime, matching CS callback will be called.

You can use MCF5XXX_QSPI_QDR_QSPI_CS0-3 CS bit definitions in the mask/ioctl.

PetrM