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Re: [Qemu-devel] [PATCH RFC] i2c-tiny-usb
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH RFC] i2c-tiny-usb |
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Date: |
Fri, 27 Nov 2015 13:53:22 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 27/11/2015 13:39, Tim Sander wrote:
>
> I have one more thing, i2cdetect looks like this:
> 0 1 2 3 4 5 6 7 8 9 a b c d e f
> 00: 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
> 10: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
> 20: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f
> 30: 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f
> 40: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f
> 50: 50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f
> 60: 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f
> 70: 70 71 72 73 74 75 76 77
>
> But i only have a device at 0x50 so most numbers should be "--".
> I know that i just have to set the read length to zero, to archive that.
> Currently i don't know how to determine if there is something registered on
> the requested i2c address?
If there is no slave at the requested address, i2c_start_transfer will
return 1.
Paolo