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Phil23
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Joined: 27/03/2016
Location: Australia
Posts: 1667

Posted: 08:10pm 06 Dec 2017

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Probably for Rob, Peter & Geoff.

Re the little bit of discussion recently about using other TTL devices on the console when the 1455's in circuit.

I noticed in Geoff's original design, that pins 9 & 10 are only used of initial programming, and not in the final circuit.

It has always had me wondering if whether 9 & 10 could be put to use for connecting other TTL devices for wireless access.

AND....
If so would that be able to not only provide wireless forms of access, which we already have, but also be able to feature over the air firmware updating.

(Both aware & wary of firmware updates over these sorts of links, but at times worth the risk cost).

Cheers

Phil

MicroBlocks

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Joined: 12/05/2012
Location: Thailand
Posts: 2209

Posted: 06:13am 07 Dec 2017

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Pin 9 and 10 can function as a I2C.
If you add some software you should be able to use those pins for communicating with something else.
If you can repurpose pin 8 and pin 4 then SPI becomes available.
Edited by MicroBlocks 2017-12-08

Microblocks. Build with logic.

goc30

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Joined: 12/04/2017
Location: France
Posts: 435

Posted: 11:27am 07 Dec 2017

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I have a 1459 chip
in picture you can see changes (in RED). I don't know if it is good, because the serial port is not on the same registre.

you can use rc4/rc5 for led with ComPort transmit/receive

(in magenta: new connection)Edited by goc30 2017-12-08

robert.rozee
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Joined: 31/12/2012
Location: New Zealand
Posts: 2462

Posted: 11:52am 07 Dec 2017

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pins 9 and 10 are accessible, but only when the 1455 is in programming mode - and to get there requires pressing the 'select mode' button. their function (once enabled) is to turn on/off Vpp and Vcc when programming other than a permanently attached pic32. while present, this functionality is there "for future use" and needs to be turned on before use via commands coming in through the 1455's usb port.

if you really wanted a remote pic32 firmware upgrading ability, your best bet would be to use an arduino pro mini. using the 328p firmware that pic32prog can program into any arduino, it is possible to turn on/off Vcc and carry out programming of an attached pic32 using commands sent to the arduino mini's serial port. this could be attached to an HC-12 for instance. you would likely also need to figure out a scheme for sharing the HC-12 with micromite basic.

cheers,
rob :-)

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