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Topics - Werner

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LPC2xxx / FlashMagic 12.75 doesn't erase/program LPC2129
« on: January 29, 2020, 05:24:47 am »

i found that FlashMagic 12.75 cannot erase/program an LPC2129 anymore. Reading device signature works well.

I took a terminal program in order to watch for differences between FlashMagic 11.20 (erase/program works well) and FlashMagic 12.75 and found that FlashMagic 12.75 sends an oscillator frequency of 0. With that the erase command stalls inside the LPC2129.

FlashMagic 11.20 has a field for an adjustble oscillator frequency which is filled with 12.000 MHz by default. The LPC2129 has no internal RC-oscillator but always runs on the external crystal. So the LPC2129 needs this number for the erase/program timing.
I tried to set the oscillator frequency to 0 in FlashMagic 11.20. Then the LPC2129 stalls again. Setting a frequency of 100 MHz makes erasing very slow.

FlashMagic 11.20 LPC2129 Erase all command, sent:
?Synchronized<\r><\n>12000<\r><\n>J<\r><\n>U 23130<\r><\n>P 0 16<\r><\n>E 0 16<\r><\n>

FlashMagic 12.75 LPC2129 Erase all command, sent:
?Synchronized<\r><\n>0<\r><\n>J<\r><\n>U 23130<\r><\n>P 0 16<\r><\n>E 0 16<\r><\n>


When I start FlashMagic by double-clicking an .fmx-file a message comes up ("The project has been modified. Do you want to save it?"). I have to click "No", then the settings of the double-clicked .fmx-file are loaded. Is this the wanted behavior of FlashMagic? Older versions of FlashMagic worked well by double-clicking the old .fms-file.

Best regards

ARM Cortex / Nice to have
« on: December 09, 2014, 05:02:30 am »
Hi Andy,

for the LPC1853 and other devices one can choose whether to access flash bank A or B. FlashMagic is able to take just the relevant parts of the hex file for programming.
It would be nice to have a third option "All" in order to program the entire flash in one step.

ARM Cortex / LPC1853 Can't Access Flash Bank B at 0x1B000000
« on: December 05, 2014, 01:24:33 pm »
when I try to program (or even blank check) Flash bank B on my LPC1853 (Rev '-'), I get an error message: "Device does not support operation (no flash memory)". But the LPC1853 does have 256kB Flash on Bank B.

The Display Memory command does work on bank B, of course it shows an empty memory, since I haven't been able to program it yet.

LPC9xx/LPC9xxx / LPC9xx baud rate tolerance
« on: November 07, 2008, 11:16:28 am »
Hallo Andy,

i found a problem in flashmagic (Version V4.33.1397):
During programming flashmagic sends records of 64 bytes data plus some more for address, checksum etc. All bytes are sent with maximum speed without any gaps between them (just 1 stop bit).
The ISP bootloader resides in the top region of the flash and therfore cannot use RX/TX interrupts in conjunction with RAM buffers. Since the chip has to echo every received byte the bootloader can receive bytes only as fast as its transmissions are. If the chip's baud rate is slightly slower than flashmagic's baud rate and there are many bytes to receive (and to send back), at some time flashmagic overflows the bootloader and one byte is lost. Them programming stucks and a transmit/receive error occours. This also occous with the ICP-bridge at 19200 baud.

The tolerance of the LPC9xx RC-oscillator has become worse. In the beginning almost every LPC932 had +/-1%, now there are many LPCs with +/-2.5%

So now my question:
Is it possible to insert a time gap of 1 byte every 16 or 32 bytes? Then the chip would be able to catch up timing.

I've got a second question:
I modified the bootloader to autobaud up to 115200 baud. Who is the right person at NXP to make a suggestion?

Kind regards

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