i2c still not working for me

[Daniel Braniss]

> On 9 Apr 2019, at 10:58, Emmanuel Vadot <manu at bidouilliste.com> wrote:
> 
> On Tue, 9 Apr 2019 10:50:22 +0300
> Daniel Braniss <danny at cs.huji.ac.il> wrote:
> 
>> Hi,
>> after the latest changes to i2c there is a small improvement,
>> i2c -s finds the device but complains:
>> 
>> root at neo-14:~ # i2c -s
>> Hardware may not support START/STOP scanning; trying less-reliable read method.
>> Scanning I2C devices on /dev/iic0: 24
>> 
>> but nothing else works.
>> 
>> I?ll try and connect my saleae signal analyzer later, but  in the meantime this is what I get
>> on the console:
>> [?]
>> iichb0: twsi_control_clear: read val=58
>> iichb0: twsi_control_clear: write val=40
>> iichb0: TWSI_WRITE: Writing 40 to c
>> iichb0: twsi_start: twsi_start: slave=48
>> iichb0: twsi_locked_start: send start
>> iichb0: TWSI_READ: read 58 from c
>> iichb0: twsi_control_set: read val=58
>> iichb0: twsi_control_set: write val=68
>> iichb0: TWSI_WRITE: Writing 68 to c
>> iichb0: twsi_poll_ctrl: Waiting for ctrl r.
>> eg to match mask 8
>> iichb0: TWSI_READ: read 48 from c
>> gic0: iichb0: Spurious interrupt detected: last irq: 32 on CPU1
>> twsi_poll_ctrl: done
>> gic0: iichb0: Spurious interrupt detected: last irq: 32 on CPU1
>> TWSI_READ: read 8 from 10
>> iichb0: twsi_locked_start: status=8
>> iichb0: TWSI_WRITE: Writing 48 to 8
>> gic0: Spurious interrupt detected: last irq: 32 on CPU1
>> iichb0: TWSI_READ: read 48 from c
>> gic0: iichb0: Spurious interrupt detected: last irq: 32 on CPU1
>> twsi_control_clear: read val=48
>> gic0: iichb0: Spurious interrupt detected: last irq: 32 on CPU1
>> twsi_control_clear: write val=40
>> gic0: iichb0: Spurious interrupt detected: last irq: 32 on CPU1
>> TWSI_WRITE: Writing 40 to c
>> gic0: Spurious interrupt detected: last irq: 32 on CPU1
>> iichb0: twsi_poll_ctrl: Waiting for ctrl reg to match mask 8
>> gic0: iichb0: Spurious interrupt detected: last irq: 32 on CPU1
>> TWSI_READ: read 48 from c
>> iichb0: twsi_poll_ctrl: done
>> iichb0: TWSI_READ: read 8 from 10
>> iichb0: twsi_locked_start: no ACK (status: 08) after sending slave address
>> gic0: iichb0: Spurious interrupt detected: last irq: 32 on CPU1
>> twsi_stop: twsi_stop
>> [?]
>> 
>> BTW, the hardware is NanoPi-neo and it?s running Current 345984
>> 
>> thanks,
>> 	danny
>> 
> 
> Based on the function names you are using directly stop/start/etc ...
> My changes were only for i2c_transfer (I2CRDWR ioctls)
> 

ok, this will show my ignorance, but could you send me some sample code that uses I2CRDWR?
btw, the device i’m trying out is an RFID reader pn533, which works with a modified driver …

thanks,
	danny

> -- 
> Emmanuel Vadot <manu at bidouilliste.com> <manu at freebsd.org>