On 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
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 Th??ng L?? <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 Th??ng L?? <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, Th????????ng L???????? <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."
???????? George Fitch, Atlanta Constitution Newspaper, 1916
Actually theres no shifting involved, only manipulating bit 7 of the
8 bit data
Peter Wallace
Mesa Electronics
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Peter Wallace
Mesa Electronics
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Email: lethang12...@gmail.com
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L?? Th????ng
Phone: (+84) 1222443855
Email: lethang12...@gmail.com
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L?? Th????ng
Phone: (+84) 1222443855
Email: lethang12...@gmail.com
Peter Wallace
Mesa Electronics
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(")_(") signature to help him gain world domination.------------------------------------------------------------------------------
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