Mesa modbus and pktUart

vre
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16 Mar 2025 19:11 #324067 by vre

Replied by vre on topic Mesa modbus and pktUart

yes this patch works..
the strange is that works very fast with update-hz 1000

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PCW
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16 Mar 2025 20:28 #324069 by PCW

Replied by PCW on topic Mesa modbus and pktUart

At update-hz = 1000 the update rate will be limited by the data communication time plus the response time.
(9600 baud is about 1 ms per character so probably something like 100Hz would be the max communication rate
if the I/O device had no delays in responding to commands)

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vre
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16 Mar 2025 23:30 #324076 by vre

Replied by vre on topic Mesa modbus and pktUart

with update-hz 0 all work fine if set it to possitive i get
call/response function number mismatch but this didn't hurt is the known bug..
What does this code that removing it fixes the problem?

        // Check for Send Count FIFO error
//		r = hm2->llio->queue_read(hm2->llio, hm2->pktuart.instance[inst].tx_mode_addr,
//                                     &buff, sizeof(rtapi_u32));
//        if ((buff >> 4) & 0x01) {
//            HM2_ERR_NO_LL("%s: SCFFIFO error\n", name);
//            return -HM2_PKTUART_TxSCFIFOError;
//        }

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PCW
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16 Mar 2025 23:44 - 17 Mar 2025 00:32 #324077 by PCW

Replied by PCW on topic Mesa modbus and pktUart

Edit: The test code was removed because it was in
the wrong place, it will be restored to the correct
place later. its not a very important test.

The error was that the code accessed a RX buffer
that was not filled yet, this trashed the stack under
some circumstances, causing random garbage
in other functions.

The function miss-match is unrelated. This happens
because the PKTUART RX FIFO is not cleared before
the modbus driver starts, so may have left over characters
from the last time LinuxCNC was run, power cycle garbage
charcters etc. Its not harmful and will be fixed soon.

Last edit: 17 Mar 2025 00:32 by PCW.

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