My Logomatic V2 "USB LED" stays "ON" ??

Development Boards MicroMod
1

Greetings All,

I have a new Logomatic powered with a SFE LiPo battery.

The USB LED is on anytime the Logomatic power switch is in the ON position. (The USB LED is ON when the Logomatic is connected to USB port of my Dell desktop computer and the USB LED is ON even if the USB cable is not plugged into the Logomatic.)

Is this normal? How does the USB LED function on your Logomatic?

Beyond this LED issue, the Logomatic seems to be logging data just fine.

Thanks for any comment or advice,

Richard

2

If it is the one near the USB connector it is actually a power indicator and is not connected to the USB. You can disable the IO in the firmware (I did this to reduce power consumption in sleep mode) The light near the connector seems to indicate charging

Stefan

3

let me correct my last statement. it is connected to the USB but it also is connected to P0.31 via a transistor. This is what I deactivated.

4

Thanks for your comments. I think the USB LED is not as helpful as it might be. A Logomatic firmware that made the operation of the USB LED an option in the control file would be a neat feature.

Richard

5

IOSET0 |= 0x80000000; //power light set high (off)

will turn the power indicator part of the light off - it should still turn on from the usb

6

Hi Stef, i recently bought a Logomatic to enter with the ARM

processors, but i just can´t find an IDE like the AVR Studio

or MPlab ide… i’ve tried with Keil, and Raisonance but i can´t

program flash, now i have instaled an EV Version for

CrossWorks…

Could you help me to take an IDE? really i´m a newbie with

ARM and by my work i MUST learn to program these devices in a

very short time (the learning curve task again). I just wnat to code a LPC2103 and a LPC2148.

Thanks in advance.

7

Hi Sauron,

I am pretty new to this myself. I am using the winARM freeware that is described on the sparkfun website. I have been using the bootloader that is supported by the logomatic V2 which is really fast and pretty easy to use. The use of the winArm and the bootloader is described pretty well on the SparkFun site and the makefile supplied with the firmware download makes the appropriate file to drag onto the SD card to update your program. I downloaded an update of the text editor supplied with winARM which seems to have been improved somewhat.

Good luck,

Stef

8

My Logomatic V2.0 USB light also stays on all the time, and it is not logging anything.

I have it powered by 3.3V coming into the solder jumpers, and I have a 3.3V TTL-level RS232 Tx from my board coming into the RXI0 on the Logomatic. I have also tried the serial data coming into RXI1 and it didn’t work either. (By the way, the documentation is pretty poor on Logomatic, doesn’t it seem?)

I have never reprogrammed the thing – I am using it as it came from SparkFun.

I connect the USB to the computer, and I can see the files and edit the control file. However, when I connect it to a TTL-level UART and power it up and send it data, nothing ever gets logged.

Can anyone give me a hint?

9

Well, I solved it! I wanted to post for others to use the knowledge.

It had to do with the impedance of the power source. The Logomatic uses a lot more current than the other things on my board, I think about 60 mA, and may have a bit of inrush requirement. So I increased the current capability of my power source, and it works great!

I will be switching it on an off from my application, because it is not a low power accessory, but that’s the break for the simplicity of using this off-the-shelf unit.

However, studying the schematic, I see how indeed simple it is to connect with a uSD card. Maybe in the future I will create my own data logging capability.

10

For the records, the USB LED is off when powered off but in ISP if the USB cable is disconnected. This is because ISP leaves most pins in the reset state which is input, therefore high-Z and not driving the transistor.

As Stef reported, it can be switched off in your microcode.