Hi, On Fri, Jan 3, 2014 at 4:08 PM, Micka <[email protected]> wrote: > > Ok, > > Well, the baudrate is at 38400, the distribution is the Ubuntu from Robert C Nelson ( 3.8.13 bone 30 ), the driver is the omap . I've modified a little bit the driver to add RS485 support ( see the patch attached ) , the only major modification that I've done is to add : > > + wait_for_xmitr(up); > + if (up->rs485.flags & SER_RS485_ENABLED) { > + if(up->rs485.delay_rts_after_send>0){ > + udelay(up->rs485.delay_rts_after_send); > + } > + /* Disable RS485 TX EN */ > + val = (up->rs485.flags & SER_RS485_RTS_AFTER_SEND) ? 1 : 0; > + gpio_set_value(up->rs485.gpio_pin, val); > + } > > > in the function serial_omap_stop_tx . > > > It works most of the time, but for an unknown reason there is this weird behavior ..... > > > Any tips ? lead to follow ?
How much data are you writing? Are you doing it with a single call to write? If you're doing multipe calls to write then its quite possible that a context switch is allowing another task to run and delaying your second write. -- Dave Hylands Shuswap, BC, Canada http://www.davehylands.com -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
