On Friday 23 March 2018 05:04:47 Thắng Lê wrote: > i guess i cant contact UART on mesa 5i25 by linuxcnc, just only can > get data from FIFO. I found a way to solve this problem without > touchich uart.c source but it's not complete. > > in 8 bytes serial, the first data is "P" (80 in hexa) and last bytes > is "CR" (13 in hexa). > > if i read FIFO data every 1 ms ( speed to read 1 bytes at 9600 > baudrate and 10 bit frames), function will stop reading when it sees > 80 ( or 13) but i get only 1 byte that is 80 (or 13). I guess RX FIFO > is cleared everytime i read but i didnt find where that function is > in: 9600 baud? Run that up to as fast as you can. At 9600, you'll be watching grass grow. 256k or better.
> https://github.com/araisrobo/linuxcnc/blob/master/src/hal/drivers/mesa >-hostmot2/uart.c#L267 > > So I "read" data in RX FIFO as fast as time to send/receive 8 bytes > data, function will stop when it sees 80 . For UART has 9600 > baudrate, 10 bit/byte and 8 bytes. My formula to caculate thread : > 100us/bit * 10bit/byte * 8bytes * 2 ( for tx and rx). > This time i get all data but sometimes lost last bytes. > > Below is my modified mesa_uart.comp file. > > 2018-03-23 10:47 GMT+07:00 Thắng Lê <lethang12...@gmail.com>: > > 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 -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ 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
