uALFAT very slow to respond or not responding at all

[RichardGunn]

I have just started working with my first uALFAT. I have it connected, in UART mode, to Hyperterminal and successfully got the Boot Loader (V2.03) to program the firmware V3.11, receiving a response of !00.

However, now I have fitted the link to allow the uALFAT out of the Boot Loader, it is not responding to commands at 9600Baud much. After several minutes, I got a start-up message out of it and have got the version using the V command, but it all seems to take forever, if it responds at all.

I am NOT using the RTC crystal and the Vbat pin is tied to the 3.3V supply.

Any ideas what I am doing wrong?

[SupportAdmin]

What is connected to CTS? This is explained in the manual very clearly.....if CTS is not low then uALFAT will not respond

[RichardGunn]

Sorry, CTS is at 0V, it is controlled by another microcontroller but it is currently always low.

[SupportAdmin]

So is it working now?

[RichardGunn]

Well yes and no, it works when you put a scope probe on the CTS pin or on the microcontroller pin which drives it; the pin always looks low on the scope but it is obviously floating. It must be a problem with the set-up of the other microcontroller. Thanks for pointing me in the right direction.

Richard Gunn

[orion]

hii..
I am working on the uALFAT SD module and am trying to connect it with the hyper terminal of the PC.

after the connections were made the letter L appeared on the PC screen.
Whereas the response should have been BL right ?

the following are the connections:(of the MMC module)

pin 1        TX USART
pin 2        RX USART
pin 7        CTS  ground
pin 5, 8    ground (SPI_SSEL# , SPI_SCK)..for USART mode.
pin 12       VBAT 3.3V
pin 13      VCC 3.3V
pin 15      ground

I even tried sending V for the version number but there is no response.

Are there any other critical connections to be made?

on the PC side( DB 9 connector) I have connected its pins ( 2, 3 ) to RS232 pins ( 14 and 13 ) respectively and pin 5 of DB9 is grounded.


 

[GHI_Support]

are connection direct from uALFAT to your PC? You shouldn't do this, you need something like MAX3232 to convert the voltage signals.

[orion]

yes there is a max232...between DB9 connector and the module...

and today I again tried...it returned the the model number (automatically)after powering ON the circuit...

then i tried sending or receiving files...nothing was happenning....

for once it showed " !00" (i.e indicating it is ready to accept the next command)...but then it showed no response to any furthur action from my side...

there was another doubt I had regarding the protocol we use to receive data from the MMC card to the PC...the options were like...X1modem, Y modem, Z ..with crash recovery... what are these and which one should I use...

thanks..

[GHI_Support]

you cannot send/receive files. uALFAT works with commands... See user manual. And on PC you should have 9600 baud 8N1 settings.