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]
> <javascript:>> 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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