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by Petergar
Thu Feb 06, 2020 11:49 pm
Forum: Troubleshooting
Topic: pi zero uart pins not configured correctly
Replies: 1
Views: 413

Re: pi zero uart pins not configured correctly

I wrote myself a utility to read the gpio registers (by mapping to /dev/gpiomem) and confirmed that the gpio control register at 7e200004 was being set correctly to 24000, which is ALT1 for each output, which is correct, so not apparently a software problem. The zero W had the register set to 12000,...
by Petergar
Wed Feb 05, 2020 11:30 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4B – Don't get output video
Replies: 6
Views: 565

Re: Raspberry Pi 4B – Don't get output video

Hi, I recently had some experience with a non-booting 3b. Try to establish that the pi is able to read from disk. I cannot see clearly from your youtube videos if the green LED is blinking or not. I believe I saw 3 green flashes, which would mean that the pi has detected a disk but is unable to load...
by Petergar
Wed Feb 05, 2020 5:25 am
Forum: Troubleshooting
Topic: pi zero uart pins not configured correctly
Replies: 1
Views: 413

pi zero uart pins not configured correctly

Hi, I have a gps I wish to connect to a pi zero, using the uart. It works with a pi zero w, but not with a pi zero. The zero w is permanently wired to a piece of veroboard, while the zero has a connector attached to a pcb. I want to use the pcb. I am accessing via /dev/serial0, which uses the PL011 ...
by Petergar
Sat Jan 25, 2020 10:47 am
Forum: Troubleshooting
Topic: My pi-3b cannot read sd-card
Replies: 3
Views: 180

Re: My pi-3b cannot read sd-card

On the pc "Raspberry Pi 3 Model B Vi.2 @Raspberry Pi 2015" So its a 3 I would say. I blasted the drive with compressed air, no change. I have already tried 3 different SD cards with the latest image, all of which also work on pi-zero, so not going to buy more, no point wasting money, this was just s...
by Petergar
Sat Jan 25, 2020 3:45 am
Forum: Troubleshooting
Topic: My pi-3b cannot read sd-card
Replies: 3
Views: 180

My pi-3b cannot read sd-card

Hi, I have a pi-3b and whenever I attempt to boot it, the red led comes on, and the green led goes into a cycle of active - 3 quick flashes - active. I have measured the io voltage with a voltmeter and it has full volts on the appropriate pins, so I do not think power supply is the issue. The 3 diff...

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