Help for Serial communication with LED driver

Spradecom · Joined: 01 Jun 2011 Posts: 19 Location: INDIA

I am using PIC 16F887 as master and MY9221 as slave. Communication with MY9221 is 16 bit communication and data is written in MY9221 on both edges of clock cycle. I had tried but get no proper communication with MY9221. Can anyone help me how to communicate with that IC ?
http://www.my-semi.com/content/products/product_mean.aspx?id=4
http://www.seeedstudio.com/wiki/images/9/98/MY9221_DS_1.0.pdf

ckielstra · Joined: 18 Mar 2004 Posts: 3680 Location: The Netherlands

I had a quick look into the datasheet and it is using a strange variation on the SPI protocol where data is clocked in on both edges but it is unclear to me how the data is clocked out.

Post your program for as far as you have it now. Make the program as small as possible by only having the setup code and code for communication to the driver. No other fancy stuff for light patterns, just one fixed gray value.

temtronic · Posted: Fri Dec 23, 2011 6:48 am

You should show us your code so that we can comment on it.
A quick look at the datasheet shows how to send the 208bits of data, it's a simple shift register chip.
If you want a 'driver' written for you, just send me 6 pieces of the chip mounted on DIP carriers and give me 1 week.
I don't give code that I cannot test 100% with real chips.