i read uart.c that is written by Andy and found some lines that maybe can clear FIFO:
https://github.com/araisrobo/linuxcnc/blob/master/src/hal/drivers/mesa-hostmot2/uart.c#L164-L165 the data receive RX at: https://github.com/araisrobo/linuxcnc/blob/master/src/hal/drivers/mesa-hostmot2/uart.c#L296-L332 When you said "disable RX", does that mean disable RX on 5i25 or RX on this driver? 2018-03-22 10:18 GMT+07:00 Thắng Lê <lethang12...@gmail.com>: > i 'm looking at* hm2_uart_setup,* the rx_mode describe: > * Bit 0* = FalseStart bit Status, 1 = false start bit detected > *Bit 1* = OverRun Status, 1 = overrun condition detected (no valid > stop bit) > *Bit 2* = RXMaskEnable, 1= enable RXMask for half duplex > operation, 0 = ingore RXMask > *Bit 4* = FIFOError, indicates that a host read has attemped to > read more data than available. (mainly for driver debugging) > *Bit 5* = LostDataError, indicates that data was received with no > room in FIFO, > * Bit 6* = RXMask, RO RXMASK status > * Bit 7* = FIFO Has Data > > I'm not very clearly understand when i read it,i dont see how to clear > FIFO or disable RX from these 7 bits. I guess u mention pktuart, right? > > > > 2018-03-22 0:28 GMT+07:00 Peter C. Wallace <p...@mesanet.com>: > >> On Wed, 21 Mar 2018, Th?ng L? wrote: >> >> Date: Wed, 21 Mar 2018 15:20:12 +0700 >>> From: "[UTF-8] Th?ng L?" <lethang12...@gmail.com> >>> Reply-To: EMC developers <emc-developers@lists.sourceforge.net> >>> To: EMC developers <emc-developers@lists.sourceforge.net> >>> Subject: Re: [Emc-developers] writing new firmware to read yaskawa >>> absolute >>> encoder >>> >>> i'm using mesa_uart to read serial data but i have a issue. Sometimes, >>> >> after sending 8 bytes, the phase A isnt come back idle state-5V state (it >> keeps 0V state). This mean uart is still getting data after first 8 >> bytes,then >> the UART data shows me rx-bytes = 16, all rx-data = 0. >> >> >> >> >> >> Is mesa_uart posible to limit the number bytes UART read? >> >> >> No, but this is expected if the input is driven low after the data >> you must only clear the UART/FIFO when the data line is idle >> >> You can disable RX if you know when the input data will become invalid >> >> (you would also expect to see the framing error bit set in this >> circumstance) >> >> >> >> 2018-03-16 23:52 GMT+07:00 Peter C. Wallace <p...@mesanet.com>: >> >> On Fri, 16 Mar 2018, Th?ng L? wrote: >>> >>> Date: Fri, 16 Mar 2018 23:43:49 +0700 >>> >>>> From: "[UTF-8] Th?ng L?" <lethang12...@gmail.com> >>>> Reply-To: EMC developers <emc-developers@lists.sourceforge.net> >>>> To: EMC developers <emc-developers@lists.sourceforge.net> >>>> Subject: Re: [Emc-developers] writing new firmware to read yaskawa >>>> absolute >>>> encoder >>>> >>>> ah, i understood what you mean. thank you very much >>>> >>>> >>> 2018-03-16 23:30 GMT+07:00 andy pugh <bodge...@gmail.com>: >>> >>> On 16 March 2018 at 16:27, Thÿÿÿÿng Lÿÿÿÿ <lethang12...@gmail.com> >>> wrote: >>> >>>> > this is a great idea but how can i right-shift the data? Both your way >>>> and >>>> > Peter's way seem have to touch UART source >>>> >>>> No, you can shift the raw data in the HAL component that interprets the >>>> data. >>>> >>>> -- >>>> atp >>>> "A motorcycle is a bicycle with a pandemonium attachment and is >>>> designed for the especial use of mechanical geniuses, daredevils and >>>> lunatics." >>>> ÿÿÿÿ George Fitch, Atlanta Constitution Newspaper, 1916 >>>> >>>> >>> Actually theres no shifting involved, only manipulating bit 7 of the >>> 8 bit data >>> >>> Peter Wallace >>> Mesa Electronics >>> >>> ------------------------------------------------------------ >>> ------------------ >>> Check out the vibrant tech community on one of the world's most >>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>> _______________________________________________ >>> Emc-developers mailing list >>> Emc-developers@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-developers >>> >>> >>> >> >> -- >> Lÿÿ Thÿÿÿÿng >> Phone: (+84) 1222443855 >> Email: lethang12...@gmail.com >> ------------------------------------------------------------ >> ------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> _______________________________________________ >> Emc-developers mailing list >> Emc-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-developers >> >> Peter Wallace >> Mesa Electronics >> >> (\__/) >> (='.'=) This is Bunny. Copy and paste bunny into your >> (")_(") signature to help him gain world domination. >> >> ------------------------------------------------------------ >> ------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> _______________________________________________ >> Emc-developers mailing list >> Emc-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-developers >> >> > > > -- > Lê Thắng > Phone: (+84) 1222443855 > Email: lethang12...@gmail.com > -- Lê Thắng Phone: (+84) 1222443855 Email: lethang12...@gmail.com ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
