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Forum Index : Microcontroller and PC projects : MMX Help needed
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| WhiteWizzard Guru  Joined: 05/04/2013 Location: United KingdomPosts: 2959 |
With the 'solder flood method' involving wick 'clean-up' - you do still need to then run a wet tip over the pins to give a nice clean (and secure) finish. The iron needs to be used very gently so as to avoid putting any pressure on the thin pins - otherwise the pins can bend and become close to the neighbouring pin). Side-profile pictures would help highlight any soldering/shorting/bridging issues. |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10570 |
You can use either pair. In the case of this PCB the other pair is pin 5 of the 40-pin header and the right audio channel |
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OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 1013 |
There seems to be a glimmer of hope...........  Connecting to MPLAB PICkit 3... Currently loaded firmware on PICkit 3 Firmware Suite Version.....01.46.14 Firmware type..............PIC32MZ Programmer to target power is enabled - VDD = 3.300000 volts. Target Device ID (0x7222053) is a valid Device ID but does not match the expected Device ID (0x7227053) as selected. 2018-03-21 15:56:34 +1100 - Programming... Device Erased... Programming... The following memory area(s) will be programmed: program memory: start address = 0x0, end address = 0x12dfff boot config memory configuration memory Programming/Verify complete 2018-03-21 15:58:30 +1100 - Programming complete Pass Count: 33 This is from the first board I loaded. I will put it down to my soldering techniques not the PCB or design. I have gone over the pins a few times with plenty of liquid flux and a very small amount of solder on the tip. ( I am using Jaycar Pencil Soldering Iron . I could see the heat follow from the pad to the pin and moved on to the next. My current limitation seems to be the lack of magnification for my eyes using the illuminated lens. I think it is 5X magnification and I think 10X would be better. My continuity testing from the shoulder of the chip to the various pins must have had enough pressure to make the pin contact the pad. I have tried to access the chip via the console but still no joy will delve in deeper as time permits. OA47 |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10570 |
Glad you are making progress finally. To get the chip fully working the oscillator needs to be in place (and the two potential divider resistors if using a through-hole 5V oscillator). Install the heartbeat LED and if that is flashing MMBasic is running |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 1013 |
Now that I think that I have a lot less dry solder joints on the PIC, I am learning to drive the beast. Can someone give me a pointer as to why TTS does not work TTS "Hello" Error:Not Enough Memory mm.ver=5.0414 |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10570 |
Please let me know what options you have set and I'll try and replicate |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 1013 |
Here are the current options: OPTION LIST OPTION CPU 200 OPTION COLOURCODE ON OPTION DISPLAY 24, 53 OPTION LCDPANEL VGA OPTION KEYBOARD US OPTION SDCARD 93, 94 OPTION LCDPANEL CONSOLE OPTION RTC 15, 16 OPTION HEARTBEAT ON Thankyou Peter, OA47 |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10570 |
The error was real in that OPTION LCDPANEL VGA leaves 194K free. TTS uses a memory buffer allowing 10 seconds of speech at 22050 bytes per second so the buffer couldn't be allocated. Attached is a version where I have reduced the buffer to 8 seconds. This seems to be safe as there is also a limit of 32 phonemes which shouldn't create a buffer overrun. The TTS code is a port someone did from 30 year old assembler and doesn't include buffer overflow checking but hopefully this version won't crash  2018-03-23_201142_MMX5.04.15.zip |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 1013 |
@ Matherp Thank you for going the extra mile in not just identifying the cause of the issue, but also returning with a fixed program version. OA47 |
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