uALFAT SPI reduced power mode clarifications

[jhwsmith]

Hi All,

I am having a problem with putting a uALFAT-USB in reduced power mode, over SPI.  I am sending commands to the uALFAT from a PIC, programmed in C with the MCC18 compiler, using the supplied GHI library functions.


1. ---------------------------

On the uALFAT user manual P. 22 it says that the 'set power mode command' is as follows:

Z<SP>R>xxxx<CR>

Where 'xxxx' is TWO bytes.

However, the uALFAT library function 'GHI_μALFATPowerMode' seems to send FOUR bytes as the 'xxxx'.

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2. ---------------------------

Likewise, the uALFAT library function 'GHI_μALFATPowerMode' says that variable 'baud' is the desired baud rate.  However, looking at the code it seems that it should actually be the relevent UART divider.

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3. ---------------------------
 
So after reading all the relevent posts on this forum, the furthest I have got is this:

GHI_PutC('Z');
GHI_PutC(' ');
GHI_PutC('R'); // reduced power mode
GHI_PutC('>');
GHI_PutC(0x1f); // trying to do UART 9600 baud divider 1FAB
GHI_PutC(0xab);
GHI_PutC('\r');

And I get back error code !68 (incorrect parameters).  This is the only way I can get anything back at all.

I am using a slow SPI Master Clock (Fosc/64) on a 8MHz x 4PLL clock, well below the maximum allowable for reduced mode.

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Any clarifications/suggestions would be much appreciated.

Jonathan

[GHI_Support]

If you look at documentation, all these are sent as ascii charachters. I assume the library do that too.
I think something like this:
GHI_PutC('Z');
GHI_PutC(' ');
GHI_PutC('R'); // reduced power mode
GHI_PutC('>');
GHI_PutC('1');
GHI_PutC('F');
GHI_PutC('A');
GHI_PutC('B');
GHI_PutC('\r');

[jhwsmith]

Thanks for that - I'll get back to you once I have tried that.