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: 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 > -- Lê Thắng Phone: (+84) 1222443855 Email: lethang12...@gmail.com
mesa_uart.comp
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