add CPOL setting

[reiyawea]

Add CPOL setting thus supporting SPI MODE 2&3.

[reiyawea]

Sorry for replying so late. It's difficult to access gmail here.
First, a search on bing gives that setting bit 29 in SPI_PIN register will
make CPOL=1. (See: http://bbs.espressif.com/viewtopic.php?t=1570)
It seems to be a different register naming system. Then I reviewed the
codes of other ESP8266 projects and find that one of them uses the same
naming system. It's called NodeMCU.
By matching the absolute address I found that SPI1P here is the same
register as SPI_PIN there.
I lit up a VFD module with the modified code which uses SPI MODE2 and
succeeded.
I hope it helps.

2016-03-27 5:42 GMT+08:00 0xPIT [email protected]:

I've tested just now with my logic analyzer. Unfortunately, it does not
work.
I've also tried all modes (0,1,2,3) and SCK always idles in low state,
whereas with CPOL=1 (in modes 2 & 3) it should idle at high.

Where did you find the info about bit 29 in SPI1P is setting CPOL?

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