On Fri, 23 Mar 2018, Peter C. Wallace wrote:
Date: Fri, 23 Mar 2018 07:14:38 -0700 (PDT) From: Peter C. Wallace <p...@mesanet.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 encoderOn Fri, 23 Mar 2018, Th?ng L? wrote:Date: Fri, 23 Mar 2018 16:04:47 +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 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:When you start looking for the serial data do you clear the FIFO first? (writing to the FIFO count register clears the FIFO) Does the low level read function wait for data? (FIFO count not 0) If you dont do these things its not likely you will get usable data
Also you should read _all_ characters in the FIFO every ms (meaning you must read the FIFO count first to determine how many to read) 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
