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Ensuring a TLC5947 device is disabled on power up.
Excellent,  many thanks   regards
Sunday, 22 September 2019 - 19:33
Ensuring a TLC5947 device is disabled on power up.
What is the effect of the associated input pin during startup, won't it sink the voltage thereby bringing the blank pin low and therefore making the TLC active?   regards...
Sunday, 22 September 2019 - 16:43
Ensuring a TLC5947 device is disabled on power up.
The issue isn't so easy to resolve I fear.  As I understand from reading the data-sheet, on startup all ports are inputs.     The problem I'm trying to solve is...
Sunday, 22 September 2019 - 15:27
Ensuring a TLC5947 device is disabled on power up.
Now I understand.  Thanks for the explanation   regards  
Tuesday, 10 September 2019 - 20:31
Problems with 2 SPI Slaves
this is how it's setup   /Setup SS for MCP as output     DDRC |=  (1 << PIN_SSW);  I'll but some test code on the analyser...
Tuesday, 10 September 2019 - 20:30
Problems with 2 SPI Slaves
hmm, I thought I was toggling high low as below   PORTC &= ~(1 << PIN_SSW); // Start transaction spiSendByte(0x00); // function...
Tuesday, 10 September 2019 - 20:24
Ensuring a TLC5947 device is disabled on power up.
Sweet, thank you.     That said I'm having a hard time understanding why setting an output pin to low would sink the line to 0v unless the effect is to ground it....
Tuesday, 10 September 2019 - 20:11
Ensuring a TLC5947 device is disabled on power up.
Ahh,   Just to get this straight that's all I need to do with the setup below?   regards   5v -> 10k resistor ----- > Blank pin on TLC      ...
Tuesday, 10 September 2019 - 20:03
Ensuring a TLC5947 device is disabled on power up.
sorry, my bad, data sheet is here    Generally, if a pin needs to be high while an AVR is in reset, an external pull-up resister is used.   Thanks, but yes I...
Tuesday, 10 September 2019 - 19:52
Problems with 2 SPI Slaves
I take your point, and I would dearly have liked the time to figure it out software wise, but time was a constraint.  The purist in me wanted to keep going, sadly I ran out...
Tuesday, 10 September 2019 - 19:47
Problems with 2 SPI Slaves
You're absolutely correct but testing says otherwise.  The time of the overlap is 40 micro seconds.  Is it possible that this is the time it takes a pin to change from...
Tuesday, 10 September 2019 - 19:43
Problems with 2 SPI Slaves
No, I'm not using the SPI interrupt.   Changing the MAX7221's for ones I know are 100% genuine made no difference, neither did adding a pull-up on the SS line.   The...
Saturday, 7 September 2019 - 14:46

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