ChibiOS Free Embedded RTOS

Hi!

Does it possible to flush serial driver buffer?

Thanks in advance!

Hi,

If you want to erase all the buffered content there are two ways:

1) Read and discard all content using TIME_IMMEDIATE, you get MSG_TIMEOUT when the queue is empty.
2) Reset the queue directly using iqResetI().

osalSysLock();
isResetI();
osalOsRescheduleS();
osalSysUnlock();

You may use "ch" function instead of "osal" functions, it is the same.

Giovanni

Hi,

I mean output buffer, is there any method to force driver process all output buffer to implement this scenario:

sdStart();
chprintf("log message");
// force driver to process log message before stop it
sdStop();

Hi,

There is a specific event flag for transmission complete, you need to wait for that.

Giovanni

Thanks!

Hi, Giovanni!

Is this right way to wait transmission complete:


[font=Courier New]event_listener_t serial_listener;

chEvtRegisterMaskWithFlags(&(SD2.event), &serial_listener, EVENT_MASK(0), CHN_TRANSMISSION_END);

sdStart(&STDOUT_SD, &SD2Config);

<write to STDOUT_SD>

while (true) {
chEvtWaitAny(EVENT_MASK(0));
if (chEvtGetAndClearFlags(&serial_listener) & CHN_TRANSMISSION_END) {
break;
}
}

sdStop(&STDOUT_SD);[/font]

Hi,

It looks OK.

Giovanni

At risk of stating the obvious, dependent on your application you may need to check that there is a transmission in progress before waiting for it to complete. Or just add a timeout into the event wait.

Hi,

is there no queue for events? In this case you are right, there is a chance to wait forever.
Can not figure out how to check that transmission is in progress....

Hi,

Events are bit masks, there is no queuing. You need to make sure there are no events pending before starting transmission.

Giovanni