Hmmmm.. the pwm path appears to have changed for the 4.4 kernel.
Bonescript uses
*/sys/devices/platform/ocp/48304000.epwmss/48304200.ehrpwm/pwm/pwmchip6*,
but the new 4.4 kernel path is
*/sys/devices/platform/ocp/48304000.epwmss/48304200.pwm/pwm/pwmchip6* (the
ehr is missing).
A quick hack is to edit :
*/usr/local/lib/node_modules/bonescript/src/hw_mainline.js* and remove the
*ehr* from line 95.
--Mark
On Tuesday, May 24, 2016 at 3:52:21 AM UTC-4, Baozhu Zuo wrote:
>
> I think there are some wrong with pwm driver on linux-v4.4 kernel.
> run:
> var b = require('bonescript');
> b.pinMode('P9_14', b.OUTPUT);
> b.analogWrite('P9_14', 0.7, 2000.0, printStatus);
> function printStatus(x) {
> console.log('x.value = ' + x.value);
> console.log('x.err = ' + x.err);
> }
> output:
> x.err = error updating PWM freq and value: undefined/pwm0, Error: ENOENT,
> no such file or directory 'undefined/pwm0/period'
>
> root@beaglebone:~/workspace# ls /sys/class/pwm/
> pwmchip0 pwmchip2 pwmchip4 pwmchip5 pwmchip6
>
> the export and unexport file disappeared.
>
>
> 在 2016年5月6日星期五 UTC+8上午5:27:39，robert nelson写道：
>>
>>
>>
>> On Thu, May 5, 2016 at 1:18 PM, Robert Nelson <[email protected]>
>> wrote:
>>
>>> Just a heads up, TI just landed two large changes to the v4.4.x tree
>>> today:
>>>
>>>
>>> https://github.com/RobertCNelson/ti-linux-kernel/compare/584991ea2c87ead7ce1e0ef145a9e66a4408a9d5...ee87bb1741b3e2f05a5ff46b1ad59ca82b8f2514
>>>
>>> remoteproc_pruss & sgx
>>>
>>> remoteproc_pruss: this should be compatible with v4.1.x-ti
>>>
>>> sgx: the "modules" should build and enter the archive when the kernel
>>> *.deb get's built..
>>>
>>
>> The sgx modules for stretch were successfully built, the build farm is
>> currently working on all of them, so they should get pushed to the deb repo
>> later tonight..
>>
>> Thus, the sgx flag in the ./update_kernel.sh script is now set, so it'll
>> install the sgx modules by default for v4.4.x-ti kernel's going forward..
>>
>> Regards,
>>
>> --
>> Robert Nelson
>> https://rcn-ee.com/
>>
>
--
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