Messages

Hi Friends,

I am using LPC2378 processor with 16 MHz crystal oscillator.I am trying to connect the USB CDC but the USB device not recognized by PC.

The same code using the 12 MHz oscillator is working.

Fcco value = 288 MHz
Crystal oscillator value = 12MHz
PLL 'M' value = 12
PLL 'N' value = 1
USBCLKCFG,USBSEL value = 6

Result : The USB CDC is detecting in PC

Fcco value = 288 MHz
Crystal oscillator value = 16MHz
PLL 'M' value = 9
PLL 'N' value = 1
USBCLKCFG,USBSEL value = 6

Result : The USB CDC is Not Recognized

I am using the Formula to calculate the M value is
M = Fcco/2xcrystal oscillator vale

Please help me to solve this problem.

With Regards,
Murthy.R

Yes, i am not able to program via the ulink.

Firmware disables the Embedded Debug : I will check and reply.

I have checked the crystal oscillator frequency and the speed.(12MHz and 9600bps).

with regards & thanks
Murthy.R

Hi Friends,

I am working in the LPC2378 processor.
First i Downloaded the program using keil ulink. It was programmed,then i try to reprogram it again,But it is not programmed.then i try with Flash Magic tool in ISP mode,i am not able to detect the device using the "Read Device Signature".

Every time i am getting "Operation Failed - (Failed to auto baud - step 1)" message.

Similar to this problem i have read one topic in "http://forum.flashmagictool.com/index.php?topic=3424.0"
I followed the steps what our friend suggested.


First I have Used the 16 MHz crystal Oscillator with 9600 baud rate speed,The T1 time is 50ms and T2 time is 100 ms.I have tried Different Speed and Different T1,T2 timings.
Then I Changed the 12 MHz crystal oscillator and tried with different speed and timings.

But still I am not able to programming the Chip through ISP..


Please Help me to Solve this problem.

with regards & thanks
Murthy.R