howto setup cfg bits for minimig´s PIC 18LF252?

Chain · 08 January 2009, 06:59

Is there abybody who already programmed PIC for minimig and can give me hints how to set cfg bits properly? trial and error method seems to be very time consumpting

I just need to burn tinybootloader into it

Chain · 08 January 2009, 17:03

bump

Chain · 09 January 2009, 07:08

nobody?
im sure there are few user which makes it

yaqube · 09 January 2009, 11:46

Hi,

As the Watchdog Timer is disabled the WDTPS bits are irrelevant.

It's most important to disable Low Voltage Programming.
If Brown-out Reset is enabled the VBOR should be set to 2.7V.

Caution: in the picture below selecting an option clears the selected bit!
All protection bits should be unprogrammed ('1').

The ID bytes don't matter.

Are you building a Minimig for yourself?

Cheers!

Chain · 09 January 2009, 12:25

thanks for that!!

yes ive build it, now it just need to push teh pic on a socket
hope it will works

(leds are working, and all voltages are in boundaries, no hot parts spotted)

Chain · 09 January 2009, 13:50

ive set it as on this screenshot, still pc tinybld cant see the pic

http://chain.3dgrafika.cz/temp/bits.gif

yaqube · 09 January 2009, 14:30

My mistake, the Low Voltage Programming must be DISABLED as it prevents the use of the RB5 pin as the general purpose I/O. Nevertheless you should be able to boot the FPGA with such configuration.

I can see you have enabled Stack Overflow Reset which should be disabled but it shouldn't be a reason why Tinybld can't see the PIC.

Immediately after reset or power-up the bootloader inside the PIC expects to receive a token from the Tinybld. If it doesn't happen in a given time window (a second or so) the bootloader jumps to the programmed code.

The best way is to press and hold the PGM RESET button then click CheckPIC or Write Flash in the Tinybld and then release the PGM RESET button.

Make sure you have a jumper in MCU position on your Minimig board.

Chain · 09 January 2009, 15:27

Connected to \\.\COM1 at 115200
Searching for PIC ...
Found:18F 252o/452o

but tinybld crashes while flashing the minimig core hex file

Chain · 09 January 2009, 15:53

now ive tried older pc exe (tinybld) 197 instead of 198 and

HOLY COW!

Connected to \\.\COM1 at 115200
HEX: 256 days old, INHX8M,18Fcode, total=14916 bytes.
Searching for PIC ...
Found:18F 252o/452o
WRITE OK at 15:52, time:7.359 sec

now green led is flashing!

yaqube · 09 January 2009, 15:59

The number of flashes depends on the error condition. You must have an SD/MMC card formatted using FAT16 filesystem and have minimig1.bin file in the root directory.

Chain · 09 January 2009, 16:13

monitor says out of range, and i have jumper set to 31 khz

Ive copied kick.rom and minimig1.bin to fat16 formatted sd card (1gig goodram)

yaqube · 09 January 2009, 16:22

Probably you have used a PAL core which outputs 50 Hz vertical sync and your monitor is not capable of it. Try to use an NTSC core.

Chain · 09 January 2009, 16:32

checked that with lcd which says 15.6khz,49.9hz, in both jumper positions

ive probably fucked up that spartan

Chain · 09 January 2009, 16:40

with ntsc core its 15.6khz,59,4hz, always

need a new pcb and will start again

Chain · 09 January 2009, 16:47

anynone knows if some boards from nusim ltd still left for sale?

yaqube · 09 January 2009, 16:55

Don't give up. It's hard to destroy this beast. Remove the 15kHz jumper and measure the voltage at this pin then tell us what it is. It's probably shorted to ground.

Chain · 09 January 2009, 17:16

fond one joint around that pin which leads on scan rate jumper

now it make some color stripes and then it stops at blue screen

yaqube · 09 January 2009, 17:20

What version of the PIC firmware and the FPGA core file are you using?

Chain · 09 January 2009, 17:35

im back to original one: minimig1_build_27_04_2008

yaqube · 09 January 2009, 17:53

That one has a built-in memory test but I'm not familiar with it. I hope you have also reflashed the PIC to an appropriate firmware version because they are not interchangeable.

Besides your problems might be caused by other solder joints, it's very common.

08 January 2009, 06:59	#1
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	minimig buiding (was:howto setup cfg bits for minimig´s PIC 18LF252?) Is there abybody who already programmed PIC for minimig and can give me hints how to set cfg bits properly? trial and error method seems to be very time consumpting I just need to burn tinybootloader into it Last edited by Chain; 09 January 2009 at 17:35.

09 January 2009, 11:46	#4
yaqube Registered User Join Date: Mar 2008 Location: Poland Posts: 159	Hi, As the Watchdog Timer is disabled the WDTPS bits are irrelevant. It's most important to disable Low Voltage Programming. If Brown-out Reset is enabled the VBOR should be set to 2.7V. Caution: in the picture below selecting an option clears the selected bit! All protection bits should be unprogrammed ('1'). The ID bytes don't matter. Are you building a Minimig for yourself? Cheers! Last edited by yaqube; 09 January 2009 at 14:43.

09 January 2009, 14:30	#7
yaqube Registered User Join Date: Mar 2008 Location: Poland Posts: 159	My mistake, the Low Voltage Programming must be DISABLED as it prevents the use of the RB5 pin as the general purpose I/O. Nevertheless you should be able to boot the FPGA with such configuration. I can see you have enabled Stack Overflow Reset which should be disabled but it shouldn't be a reason why Tinybld can't see the PIC. Immediately after reset or power-up the bootloader inside the PIC expects to receive a token from the Tinybld. If it doesn't happen in a given time window (a second or so) the bootloader jumps to the programmed code. The best way is to press and hold the PGM RESET button then click CheckPIC or Write Flash in the Tinybld and then release the PGM RESET button. Make sure you have a jumper in MCU position on your Minimig board. Last edited by yaqube; 09 January 2009 at 14:40.

09 January 2009, 15:27	#8
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	Connected to \\.\COM1 at 115200 Searching for PIC ... Found:18F 252o/452o but tinybld crashes while flashing the minimig core hex file Last edited by Chain; 09 January 2009 at 15:37.

09 January 2009, 16:13	#11
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	monitor says out of range, and i have jumper set to 31 khz Ive copied kick.rom and minimig1.bin to fat16 formatted sd card (1gig goodram) Last edited by Chain; 09 January 2009 at 16:31.

08 January 2009, 17:03	#2
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	bump

09 January 2009, 07:08	#3
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	nobody? im sure there are few user which makes it

09 January 2009, 12:25	#5
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	thanks for that!! yes ive build it, now it just need to push teh pic on a socket hope it will works (leds are working, and all voltages are in boundaries, no hot parts spotted)

09 January 2009, 13:50	#6
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	ive set it as on this screenshot, still pc tinybld cant see the pic http://chain.3dgrafika.cz/temp/bits.gif

09 January 2009, 15:53	#9
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	now ive tried older pc exe (tinybld) 197 instead of 198 and HOLY COW! Connected to \\.\COM1 at 115200 HEX: 256 days old, INHX8M,18Fcode, total=14916 bytes. Searching for PIC ... Found:18F 252o/452o WRITE OK at 15:52, time:7.359 sec now green led is flashing!

09 January 2009, 15:59	#10
yaqube Registered User Join Date: Mar 2008 Location: Poland Posts: 159	The number of flashes depends on the error condition. You must have an SD/MMC card formatted using FAT16 filesystem and have minimig1.bin file in the root directory.

09 January 2009, 16:22	#12
yaqube Registered User Join Date: Mar 2008 Location: Poland Posts: 159	Probably you have used a PAL core which outputs 50 Hz vertical sync and your monitor is not capable of it. Try to use an NTSC core.

09 January 2009, 16:32	#13
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	checked that with lcd which says 15.6khz,49.9hz, in both jumper positions ive probably fucked up that spartan

09 January 2009, 16:40	#14
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	with ntsc core its 15.6khz,59,4hz, always need a new pcb and will start again

09 January 2009, 16:47	#15
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	anynone knows if some boards from nusim ltd still left for sale?

09 January 2009, 16:55	#16
yaqube Registered User Join Date: Mar 2008 Location: Poland Posts: 159	Don't give up. It's hard to destroy this beast. Remove the 15kHz jumper and measure the voltage at this pin then tell us what it is. It's probably shorted to ground.

09 January 2009, 17:16	#17
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	fond one joint around that pin which leads on scan rate jumper now it make some color stripes and then it stops at blue screen Last edited by Chain; 09 January 2009 at 17:37.

09 January 2009, 17:20	#18
yaqube Registered User Join Date: Mar 2008 Location: Poland Posts: 159	What version of the PIC firmware and the FPGA core file are you using?

09 January 2009, 17:35	#19
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	im back to original one: minimig1_build_27_04_2008

09 January 2009, 17:53	#20
yaqube Registered User Join Date: Mar 2008 Location: Poland Posts: 159	That one has a built-in memory test but I'm not familiar with it. I hope you have also reflashed the PIC to an appropriate firmware version because they are not interchangeable. Besides your problems might be caused by other solder joints, it's very common.

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