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Forum Index : Microcontroller and PC projects : Confusion with SPI LCD panel

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apalert
Newbie

Joined: 06/07/2023
Location: Australia
Posts: 36
Posted: 04:46am 06 Feb 2024
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Attempting to setup a ST7735S SPI LCD panel on Picomite

Correct me if I'm wrong but from the manual I gleaned the process as:


At command prompt:
OPTION SYSTEM SPI CLKpin, MOSIpin, MISOpin
OPTION LCDPANEL ST7735S, OR, DC, RESET, CS [,offset]

In code:

SETPIN rx, tx, clk, SPI


I suspect all 3 of those lines refer to the same 3 pins but using different naming conventions and not necessarily in the same order.

Any help will be appreciated!

Mal
 
TassyJim

Guru

Joined: 07/08/2011
Location: Australia
Posts: 6283
Posted: 05:55am 06 Feb 2024
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Displays are configured from the commandline and then they are 'permanent' until the options are reset.

the DC, RESET and CS pins referred to in the second OPTION are in addition to the SYSTEM SPI pins and all 6 pins are needed.

The display will use the SYSTEM SPI pins.

Jim
VK7JH
MMedit
 
apalert
Newbie

Joined: 06/07/2023
Location: Australia
Posts: 36
Posted: 06:26am 06 Feb 2024
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Thanks Jim

And with the last line, SETPIN rx, tx, clk, SPI I'm guessing that:

rx = MOSIpin
tx = MISOpin
clk = CLKpin
 
TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6283
Posted: 06:33am 06 Feb 2024
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MOSI is 'Master Out Slave In' which I would call tx
VK7JH
MMedit
 
phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2642
Posted: 06:47am 06 Feb 2024
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As noted by Jim  'SETPIN rx, tx, clk, SPI' isn't needed as OPTION SYSTEM SPI takes care of that every time the Pico boots.

On many panels their Rx is labelled SDI and connects to MOSI = Tx on the Pico
and their Tx is labelled SDO and connects to MISIO = Rx on the Pico.
 
Volhout
Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 5091
Posted: 07:50am 06 Feb 2024
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You only need this:



Volhout
PicomiteVGA PETSCII ROBOTS
 
apalert
Newbie

Joined: 06/07/2023
Location: Australia
Posts: 36
Posted: 08:35am 08 Feb 2024
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Thanks everyone for your help. Got it running today :)
 
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