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RobG

TLC5940 driver for Tiva

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Hi there, thank you for the code. I'm still trying to learn SSI on the Tiva (I'm a beginner overall). My main question is without the boosterpack in the video, how exactly do you wire up the Tiva to the TLC5940? (I guess more specifically, does PB4 --> SCLK, PB7 --> SIN? If you know where I could find a schematic of the Tiva + the driver that would be awesome)

 

Also what is the PWM timer used for?

 

Thank you.

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Thanks for the schematic, I just tried it out but nothing is lighting up. Where in the code are you clocking/pulsing GSCLK?

 

From the schematic, it looks like P1.4 from the MSP430 maps to PE5 on the Tiva/Stellaris for GSCLK, but that port is not mentioned anywhere in the code. I think that might be the reason why it is not working for me, I'm not supplying the GSCLK signal. Do you have happen to have the code for that?

 

Also I have VCC as 3.3V, with 2.2kOhm resistor on IREF to GND.

 

Thanks again.

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Real life took over so I couldn't really work on my problem until now.

 

I have tried connecting PB2 to GSCLK but that doesn't work either.

Can you please verify that I have wired everything correctly? (Just in case there were other pins you shorted)

SIN   --> PB7

SCLK  --> PB4

GSCLK --> PB2*

BLANK --> PA2

XLAT  --> PA3

DCPRG --> PA6

VPRG  --> PA4

 

PB2 (Timer3) is configured to capture an incoming positive edge and count. What is the source for that? How would this configuration make it a GSCLK?

 

I was assuming that Timer1, the PWM (PB5), generates the GSCLK and then Timer3 counts its positive edges until it reaches a complete GS cycle.

 

Sorry for the amount of questions. This is quite a learning process for me.

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