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 on: April 18, 2018, 06:31:39 PM 
Started by Farid - Last Post by Farid
Can anyone tell me how to update only a portion of an LCD display. In my case, I need to display a numeric value on the main display once a user touches a certain button.

Now I am just transmitting the entire display content every 200 ms(which I dont think is efficient)

Thank you!

 on: April 18, 2018, 06:21:54 PM 
Started by Farid - Last Post by Farid
I am trying to load a JPEG image using the function below. if I call this function in my code, my whole program stops working, can anyone tells me what I am doing wrong here?


void cmd_loadimage(uint8_t img[], uint32_t ptr, uint32_t length, uint32_t opt)
   uint32_t i;

   ft800memWrite32(RAM_CMD + cmdOffset, CMD_LOADIMAGE);
   cmdOffset = incCMDOffset(cmdOffset, 4);
   ft800memWrite32(RAM_CMD + cmdOffset, ptr);
   cmdOffset = incCMDOffset(cmdOffset, 4);
   ft800memWrite32(RAM_CMD + cmdOffset, opt);
   cmdOffset = incCMDOffset(cmdOffset, 4);
   for (i = 0; i < length; i++)
     ft800memWrite8(RAM_CMD + cmdOffset, img);   


 on: April 18, 2018, 02:18:06 PM 
Started by shewitson - Last Post by shewitson

I am looking into the 9bit mode of the UART, but can't get my head around the datasheet.

Has anyone had any more luck with it?


 on: April 18, 2018, 09:46:24 AM 
Started by mrm78 - Last Post by pauljiao
Hi Marcel,
  I tried your code and it works fine for me.

  I enclosed the converted EVE Paletted8 format data for you to reference(with .raw file extension), which is working on my side.

  The pngp2pa.exe requires the pngquant.exe was run for the input file in advance. pngquant is the utility to make sure the input PNG file is in correct format.

   Let me know if it is working for you.

 on: April 17, 2018, 01:21:50 PM 
Started by r6mf49t2 - Last Post by FTDI Community

Please note that our recommendations are not intended to contradict or replace the datasheet, and are intended as additional helpful advice only. The device datasheet still provides the most up to date device information and so you can still refer to the configurations shown there.

By powering your regulator from the same source as VCC, you can avoid the case mentioned whereby the IOs are at unknown states which is advantageous for many use cases.

Best Regards, FTDI Community

 on: April 17, 2018, 06:17:43 AM 
Started by NW27 - Last Post by NW27
I'm using the MikroC compiler to program a FT90x and FT812 display.
When I write the following to the display "°C", the display severely breaks up with missing text/boxes and squiggly lines displayed. The issue is the "°" degree symbol. If I leave this out, the display works perfectly. If I write "DegC" it works perfectly (point being that it is not a string size issue).
Is there an issue with the FT812 displaying special characters?


P.S. Does every post have to be approved by a moderator?

 on: April 16, 2018, 12:03:48 PM 
Started by ppeter - Last Post by ppeter
This is exactly what I was looking for. Thanks a lot.

 on: April 16, 2018, 10:18:20 AM 
Started by ppeter - Last Post by FTDI Community

Please see the following links which should help:

How does RTS/CTS flow control work in an FTDI chip?

Flow Control

AN232B-04 Data Throughput, Latency and Handshaking

Best Regards,

FTDI Community

 on: April 16, 2018, 06:33:40 AM 
Started by r6mf49t2 - Last Post by r6mf49t2
This contradicts the following document: http://www.ftdichip.com/Support/Documents/DataSheets/Modules/DS_UMFT230XA.pdf

The FT230X can process signals at CMOS/TTL logic levels in the range of 1.8V to 3.3V.
Figure 5.4 shows a configuration where the FT230X is interfaced to a device with IOs operating in the range of 1.8V – 3.3V. The IO ports of this module need to be powered with a voltage level that is equal to the level of the signals it is processing. Since the FT230X’s embedded voltage regulator only outputs 3V3 the IO ports will need to be powered from another power source when operating at voltage levels other than 3.3V.

If power is applied to VCCIO and no power is applied to VCC all Ios will be at an unknown state, this however will not damage the chip.

 on: April 14, 2018, 02:12:08 PM 
Started by ppeter - Last Post by ppeter

there is little information on the RTS/CTS hardware flow control behaviour in the datasheets, e.g. for FT230X.

* At which buffer fill level will RTS be negated, when will it be asserted agian? How quickly has the sender to stop sending/how many bytes can still be sent without loss, even if RTS was negated?
* How many bytes should I expect to receive in a MCU from e.g. FT230X when the converter's CTS line is deasserted, i.e. when should the MCU negate its RTS line to stop the serial converter in time.


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