Mity CPU Platforms » MityDSP-L138 (ARM9 Based Platforms)

07/24/2024

02:31 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

I figure it's about 10% of the CPU when operating 1200 baud and 1 response per second; it gets much lower as you appr... Fred Weiser

07/22/2024

07:21 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

> before shutting off the 485 driver
Any idea how often the shutting down occurs? Jonathan Cormier

07:19 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

I patched the 8250.c file to increase the 10ms timeout. I found the timeout is really there only to assure the uart t... Fred Weiser

07/19/2024

06:14 PM PCB Development: RE: MityDSP-L138F Block Diagram Inconsistencies

Dan,
That clears things up perfectly. Thank you for a quick and comprehensive response. Dylan Louviaux

06:10 PM PCB Development: RE: MityDSP-L138F Block Diagram Inconsistencies

Hi Dylan,
The external input to the Boot Config Block is the EXT_BOOT# signal pin bin 12 of the SO-DIMM connector.... Daniel Vincelette

04:06 PM PCB Development: MityDSP-L138F Block Diagram Inconsistencies

All,
I am designing a carrier board for the MityDSP-L138F with A7 FPGA. I have noticed some inconsistencies with the... Dylan Louviaux

07/03/2024

02:19 PM Software Development: RE: MityDSP-L138 Power Draw in Deep Sleep? Waking ARM core from DSP core? Power and Sleep Controller (PSC)

Michael Bisbano wrote in message#6697:
> Hi Jonathan,
> Thank you for the response, please let me know what you fi... Jonathan Cormier

07/01/2024

09:16 PM Software Development: RE: MityDSP-L138 Power Draw in Deep Sleep? Waking ARM core from DSP core? Power and Sleep Controller (PSC)

Hi Jonathan,
Thank you for the response, please let me know what you find out! The system as a whole must be under ... Michael Bisbano

07:05 PM Software Development: RE: MityDSP-L138 Power Draw in Deep Sleep? Waking ARM core from DSP core? Power and Sleep Controller (PSC)

Michael Bisbano wrote:
> Hi all,
>
> I was wondering if anyone had data on power draw for the MityDSP-L138 in dee... Jonathan Cormier

06:34 PM Software Development: MityDSP-L138 Power Draw in Deep Sleep? Waking ARM core from DSP core? Power and Sleep Controller (PSC)

Hi all,
I was wondering if anyone had data on power draw for the MityDSP-L138 in deep sleep? My application is bat... Michael Bisbano

03:49 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

Fred Weiser wrote in message#6688:
> Changing the timer is probably not in my best interest; my project supports dow... Jonathan Cormier

06/27/2024

09:06 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

Changing the timer is probably not in my best interest; my project supports down to 1200 baud with packets up to 256 ... Fred Weiser

06:12 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

Here's the snip:... Fred Weiser

05:45 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

Looks like wait_for_xmitr has a 10ms timeout, this might explain why the TXEN is enabled for a constant time. At low... Jonathan Cormier

04:19 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

What does your pinmux look like for UART2? Jonathan Cormier

03:36 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

Please see two attached scope traces; the second with a 7 character buffer, the first with a 16 character buffer. I w... Fred Weiser

02:31 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

It looks like (in the 3.2 kernel anyway) the only serial port driver that supports the delay_rts_after_send option is... Tim Iskander

01:46 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

Thanks for the ideas; I'm looking into the code cited above now; I don't have any new news there at this time.
Ho... Fred Weiser

01:05 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

My suspicion is that the register read in wait_for_xmitr() is "lying" and the UART is actually still serializing the ... Tim Iskander

08:47 PM Software Development: RE: RS485 Direction Control on UART1

Seems like it could work. Good find. Jonathan Cormier

07:17 PM Software Development: RE: RS485 Direction Control on UART1

I did come across this application note from TI: https://www.ti.com/lit/ug/tidubw6/tidubw6.pdf?ts=1719509747706
(if ... Michael Bisbano

06/25/2024

09:59 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

The kernel driver code for RS485 support can be found here: https://support.criticallink.com/gitweb/?p=linux-davinci.... Jonathan Cormier

06:58 PM Software Development: RE: Serial port 2 issue, RS485, RTS drops to early

Seems a "paste" didn't work as expected...
SER_RS485_USE_GPIO is the same as 1<<5 Fred Weiser

06:54 PM Software Development: Serial port 2 issue, RS485, RTS drops to early

We are having a problem with serial port ttyS2 on our L138 SoM which I believe resides in the Linux driver or the TI ... Fred Weiser