Display TFT ST7789 (OshonSoft Basic).

DogFlu66

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I leave the library to use ST7789 TFT display, I have translated one that is in C language. But unfortunately I have not been able to get it to work yet. I leave the files in case someone with more experience with these displays can review it.
 

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  • Main_ST7789.bas
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  • ST7789_240X240.bas
    15 KB · Views: 169
  • _SPI_Library.bas
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  • _Pic18F26K22Library.bas
    46.4 KB · Views: 169
  • _SetUpAmicus18.bas
    2.9 KB · Views: 159
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I am using an Amicus PCB with a Pic18F26K22 microcontroller, the hardware is proven to work because I have downloaded the C language version and the TFT works.

I attach the C library used.
 

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  • ST7789_240x240.c
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This example with the basic configuration has been generated by an AI that I have been training for some time. It has not made a single syntax error but it does not work, I upload the files in case someone can review them.
 

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  • Main ST7789 ChatGPT.bas
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  • ST7789 ChatGPT_01.bas
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How different is the ST7735, as on this very web site we did some super fast SPI read/writes
I used the Il92341 and Eric was using the ST7735 the code seemed to be very similar.

I have tried searching but it must be MUCH earlier than I remeber.. Cam was involved.
 
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Hi I and D,
First thanks D for starting this thread. I hoped for this.
I have some TFT displays, so I'll see if I can get results.

Here's what I think 'I' was talking about: https://www.electro-tech-online.com/threads/tft-lcd-projects-ideas-applications-open-discussion.152344/

If anyone is particularly interested in Nokia phone screens, Eric produce fonts for them, where he produced a choice of large and small characters also scrolling, but that may be on AAC. I can 'point' to it if asked, although the TFT screens are superior.
Cheers, C.
Here's a wiring diagram for PIC to TFT:
 

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  • TFT.png
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Last edited:
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Hi,
It appears that my 'old' tft screens need level shifters, so not a good start.
I've ordered some later SPI ones.
C
 
Last edited:
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camerart said:
Hi,
It appears that my 'old' tft screens need level shifters, so not a good start.
I've ordered some later SPI ones.
C
Click to expand...
Most TFT screens are 3.3V, so you can either run your system at 3.3V, or add a 3.3V/5V converter - or you can buy TFT's with built-in converters, it's not a question of 'age', it's just a question of ordering the correct one for your needs.
 
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Nigel Goodwin said:
Most TFT screens are 3.3V, so you can either run your system at 3.3V, or add a 3.3V/5V converter - or you can buy TFT's with built-in converters, it's not a question of 'age', it's just a question of ordering the correct one for your needs.
Click to expand...
Hi N,
I used the term 'old' meaning I bought them when I was young.

I ordered new SPI ones, for simplicity.
C
 
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I'm still working on the subject, but I found that the tests are not good because the micro I use at 64Mhz internal clock when used from 16Mhz and consecutive pins of the same port are controlled (for example: PORTC.0 = 1, PORTC.1 = 0, etc) as outputs fail and do not stay at the designated value.
So I have ordered other micros to replace them, although there is no problem in using the old micro with lower clock speeds or adding a NOP after each PORTx.x and it works perfectly at any speed. Unfortunately I dismantled the display before knowing this and started with other things so I have postponed it for September. But I was also waiting for two suggestions for improvements to the compiler, one of which has already been incorporated and is that functions allow more than 5 input arguments, currently up to 30, and another of lesser importance and is that tables can be made with a greater number of elements, at least 255, which until now is limited to just over 100.
 
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Nigel Goodwin said:
Weren't the old ones SPI? - or had you specifically bought a different type?.
Click to expand...
Hi N,
At the time I bought them, I don't think I knew what SPI was. I just looked around and bought them from 'Open-smart'. I looked at them today, and I doubt they are SPI. I don't want to add comlication, so I just bought SPI ones. Should be here in 6 weeks
C
 
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Hi D,
As you can see above, I've ordered some screens, which may be a while.

I have PCBs for an other project with 18F46K20, that have Nokia screens, which are SPI, and I don't think it will take much to wire up the TFT screens in their place.

Also I can use the programs I have that with your modifications will make it a little easier for me to read than yours, so I may be able to help a little or just test what you do.

These PCBs have 8mHz crystals X4 PLL.
C.
 
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I use a lot of that same microcontroller but ending in 22, which is the same as the 20 but with more memory. I use it at 16Mhz x 4PLL with internal clock.

I have taken advantage of an order of components for work and I have added a pair of Pic18F26K22 which are the ones I use at home, and it is the one that fails me from 16Mhz, and which I use at 16Mhz x 4PLL. But in my case they arrive in just 3 days because I have ordered them from Farnell Spain.
 
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Hi D,
Supposedly, the internal clock is fine, but I had issues many years ago, so I added XTLs, and now I don't get clock issues any more, but my max is 32mHz. I'm no expert. I think both sppeds will be ok.
C
 
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camerart said:
Hi D,
Supposedly, the internal clock is fine, but I had issues many years ago, so I added XTLs, and now I don't get clock issues any more, but my max is 32mHz. I'm no expert. I think both sppeds will be ok.
C
Click to expand...
Using TFT's requires the highest speed you can get, and running the SPI as fast as the TFT will stand - however, running the PIC at 64MHz may require backing the SPI speed down a notch, as they are somewhat limited.
 
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Nigel Goodwin said:
Using TFT's requires the highest speed you can get, and running the SPI as fast as the TFT will stand - however, running the PIC at 64MHz may require backing the SPI speed down a notch, as they are somewhat limited.
Click to expand...
Hi N,
Ok! I guess that they will run slower, but not efficiently, is this correct?
C.
 
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camerart said:
Hi N,
Ok! I guess that they will run slower, but not efficiently, is this correct?
C.
Click to expand...
If you run them slower, the display updates slower, and there's a considerable amount of data to transfer to a TFT - the small Nokia LCD displays are far easier, as they are only B&W, and much lower resolution, so updates are much faster.
 
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Nigel Goodwin said:
If you run them slower, the display updates slower, and there's a considerable amount of data to transfer to a TFT - the small Nokia LCD displays are far easier, as they are only B&W, and much lower resolution, so updates are much faster.
Click to expand...
Hi N,
Ok, that's fine, at least I'll be able to test 'D's CODE.
C
 
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camerart said:
Hi N,
Ok, that's fine, at least I'll be able to test 'D's CODE.
C
Click to expand...

They even work using software SPI, but the speed is appalling

It is useful though for testing purposes, or when you inadvertently allocated the PCB SPI pins to non-SPI pins on the PIC, while you can allocate most peripheral pins to various of the physical pins it's not universal, and varies from PIC to PIC.
 
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