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fmilburn3 / WS2812

WS2812 LED drivers for MSP430G2553 in Energia and CCS C code
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no output on P1.6 #1

Closed altineller closed 5 years ago

altineller commented 5 years ago

Hello,

I tried running this with energia, msp430g2553. It did not light up the leds, so I checked the mosi pin (and other pins as well) and it does not produce the usual output for the ws2812 leds, i mean there is no output or voltage change on the scope screen.

What could have gone wrong?

fmilburn3 commented 5 years ago

The output is on pin P1.7 (MOSI) - see comments in code. Not sure what is wrong if it does not work for you. Make sure you don’t power the WS2812s with 5V as the MSP430s are not 5V tolerant.

altineller commented 5 years ago

I looked up the wrong pin map from energia site, (which they removed the 2553) so this was my mistake. I also got it to work with TivaC with the following settings:

define SPIDIV SPI_CLOCK_DIV2

define SPILONG 0b11100000

define SPISHORT 0b10000000

Also, it seems that while transmitting from MOSI, it also pulls down the CS of the SPI port. (Naturally)

Is there a way to avoid that behaivor?

Best Regards,

fmilburn3 commented 5 years ago

There was a post on 43oh about using this same method with the Tiva C. There are also some posts that use assembly to do the timing which might work the other problem if I remember correctly. You could do a search on 43oh.