MCF52259 QSPI 5 Chip select

fcorra — Mon, 20 Sep 2010 23:56:12 GMT

Hi,

i'm working on a custom board with 3 internal (cs0,cs2,cs3 ) + 2 external (gpio) chip select for spi device.

I got a look at the driver code and found that the ioctl install the callback function

as:

callbacks = (SPI_CS_CALLBACK_STRUCT_PTR)(param_ptr);
                for (num = 0; num < MCF5XXX_QSPI_CS_COUNT; num++)
                {
                    if (0 != (callbacks->MASK & (1 << num)))
                    {
                        io_info_ptr->CS_CALLBACK[num] = callbacks->CALLBACK;
                        io_info_ptr->CS_USERDATA[num] = callbacks->USERDATA;
                    }

The internal structure has a callback function and userdata for each CS but install the same values on each CS.

the MCF5XXX_QSPI_CS_COUNT is defined as 4, this is the total CS count (included CS0,CS2,CS3 ) or just the callback managed CS?

if it is the total CS count how can i manage 5 CS? Do i need to modify the driver code?

Thanks

fulvio

Re: MCF52259 QSPI 5 Chip select

PetrM — Fri, 24 Sep 2010 20:09:03 GMT

You can call this IOCTL five times, each time with MASK set to different CS and with different callback to have it separated.

I'm affraid you'll have to set the MCF5XXX_QSPI_CS_COUNT to 6 and recompile BSP for your purpose. It's total number of CSs. And you'll have to come up with your own bit definitions of CS4 and CS5 (external).

PetrM

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MCF52259 QSPI 5 Chip select

Re: MCF52259 QSPI 5 Chip select