i.MX Processors中的主题 Re: EPDC Android Patch Rev 13.4.1.01

EPDC Android Patch Rev 13.4.1.01

norishinozaki — Wed, 20 Jan 2016 01:58:35 GMT

Hello,

I'm using EPDC Android Patch Rev 13.4.1.01.

There is JavaDoc in the patch like follows.

/** * The waveform mode of no wait update

* @hide

public static final int EINK_WAIT_MODE_NOWAIT = 0x00000000;

/** * The waveform mode of wait update

* @hide

public static final int EINK_WAIT_MODE_WAIT = 0x00000040;

/** * The Mask of waveform mode

* @hide

*/ public static final int EINK_WAIT_MODE_MASK = 0x00000040;

Could you provide a doc which explains the register functions?

Best regards,

N.Shinozaki

Re: EPDC Android Patch Rev 13.4.1.01

gusarambula — Thu, 28 Jan 2016 17:15:20 GMT

Hello Nori Shinozaki,

Unfortunately we do not have a document explaining the code. The only recommendation we can provide is to review the code in order to understand what each of the definitions represent.

For example, EINK_WAIT_MODE_xxx is used in the followed code, so we can understand it tells the driver to wait for the EINK operation to be complete or not.

+ if((updatemode & EINK_WAIT_MODE_MASK) == EINK_WAIT_MODE_NOWAIT)

+ wait_for_complete = false;

+ else if((updatemode & EINK_WAIT_MODE_MASK) == EINK_WAIT_MODE_WAIT)

+ wait_for_complete = true;

+ else

+ LOGI("wait_for_complete wrong\n");

...

+ if (wait_for_complete) {

+ /* Get unique marker value */

+ upd_data.update_marker = marker_val++;

+ } else {

+ upd_data.update_marker = 0;

+ }

+ retval = ioctl(fb_dev, MXCFB_SEND_UPDATE, &upd_data);

+ while (retval < 0) {

+ /* We have limited memory available for updates, so wait and

+ * then try again after some updates have completed */

+ usleep(300000);

+ retval = ioctl(fb_dev, MXCFB_SEND_UPDATE, &upd_data);

+ LOGI("MXCFB_SEND_UPDATE retval = 0x%x try again maybe", retval);

+ }

I hope this helps!

Re: EPDC Android Patch Rev 13.4.1.01

norishinozaki — Fri, 29 Jan 2016 07:05:40 GMT

Hello All,

Understood, thanks for answers!

Best regards,

Nori Shinozaki

2016-01-29 2:17 GMT+09:00 gusarambula <admin@community.freescale.com>:

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EPDC Android Patch Rev 13.4.1.01
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