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matherp
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Joined: 11/12/2012
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Posted: 05:09pm 06 Mar 2019

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I did some more testing on the Nucleo-L476 and discovered that analogue input wasn't working using the Armmite-L4 firmware. It transpires that the analogue setup on the L476 is sufficiently different from the L433/432/431 to require compiling with the chip specific libraries.

I can't test the L476 anymore as my Nucleo has undergone a heart transplant and is now the mythical Nucleo-L496 (64-pin variant). Much more memory

2019-03-07_031232_ArmmiteL476.zip

If you have an unmodified Nucleo-L476 please could you give the above firmware a quick checkout - particularly the various special function pins (analogue, i2c, spi, etc.)

Thanks
Edited by matherp 2019-03-08

panky

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Joined: 02/10/2012
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Posted: 11:38am 07 Mar 2019

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As luck would have it, there is a 476 on its way to me now ~ will try to get testing monday. Thanks for the update,
panky.

... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it!

panky

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Posted: 11:44am 07 Mar 2019

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@matherp

Do I take it from your picture, you have just lifted the 476 and replaced it with a 496 on the nucleo~l476rg board?

panky

... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it!

matherp
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Posted: 12:17pm 07 Mar 2019

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Quote Do I take it from your picture, you have just lifted the 476 and replaced it with a 496 on the nucleo~l476rg board?

Yes - hot air gun carefully applied until the existing solder softens (unleaded unfortunately so quite hot). Remove existing chip, clean pads with solder wick, then solder the new STM32L496RGT6 chip in place.

Edited by matherp 2019-03-08

panky

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Posted: 05:01am 11 Mar 2019

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Peter,

Re the analogue inputs on the NUCLEO-L476RG - loaded with your 2019-03-07_031232_ArmmiteL476 software - all are looking good.

Pins A0-A5 all appear to work correctly and respond to the A reference or the pin number correctly.

Pins 10(PC2),11((PC3),22(PA6),23(PA7),24(PC4),25(PC5) and 27(PB1) all appear to work correctly.

Pin 21(PA5) loads the input down when the input voltage rises above about 1.6V - I guess as it is connected via a solder bridge to LED2. Below 1.6V it appears to works correctly as an analogue input. Didn't take the bridge off as below the cutoff voltage, it looks OK.

All analog voltages read about 40mV low (according to my multimeter which is a reasonable quality unit but no guarantee of its accuracy).

Hope this assists.

Doug.

... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it!

matherp
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Posted: 01:31pm 11 Mar 2019

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Thanks for the testing

Quote All analog voltages read about 40mV low

Try "OPTION VCC pin(VDDA)" and see if that improves things (or makes them worse

)

panky

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Posted: 10:48pm 11 Mar 2019

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Excellent - analogue voltage readings now within a millivolt or 2 of the multimeter! Thanks.

... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it!

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