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Forum Index : Microcontroller and PC projects : New CMM2. Keyboard not working if SD card plugged in.
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 8296 |
As it says really... No battery fitted. Date & time setup always works, whether SD card is fitted or not. Without SD card I see the Check Disk error, but not when it's installed. Without SD card I can input normal commands & run a For/Next loop on a line. Display is good, no problems there (at this stage anyway!). SD cards (same problem with all of them): 4GB Transcend SDHC FAT32 blank 8GB Toshiba SDHC I class 10 FAT32 blank 8GB micro-SDHC I FAT32 blank in an adaptor Soldering on SD card socket *looks* ok. There seems to be connection between the PCB pad and high up on all the socket connections along the back. Anyone got any ideas? Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10594 |
Measure the 5V rail with and without the SCcard plugged in and if not solid 5V then try a different power supply. Details of which version CMM2 would be helpful Edited 2021-03-14 03:22 by matherp |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8296 |
Thanks very much. Peter. The supply was the problem. Swapped the supply and also found a shorter lead. Bang on 5V now and it seems to be working ok now. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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