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allenhuffman
Joined: 17 Jun 2019
Posts: 552
Location: Des Moines, Iowa, USA
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 Posted: Fri Dec 04, 2020 12:04 pm |
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| Ttelmah wrote: | Er. Level=7, is the highest priority. Not what is wanted.....
Level=1. |
I haven’t even looked at that yet. I just assumed "there must be a reason it says 7" 
We use a ton of timers (most use every timer available) and I2C as the only interrupts.
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ? |
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allenhuffman
Joined: 17 Jun 2019
Posts: 552
Location: Des Moines, Iowa, USA
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| Posted: Wed Dec 16, 2020 11:16 am |
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Just curious... I based my polled I2C routines on existing examples. As such, after each byte, I poll looking for either a stop bit or the next incoming ISR flag:
| Code: |
// Wait for either a stop bit, or another incoming data byte.
while ((P == 0) && (I2C_SYSTEM_BUS_IRQ_PENDING_BIT == 0));
if (P != 0)
{
//DEBUG_PRINTF ("P");
break;
}
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I recently saw code that polled the RBF (receive buffer full) status instead of the IRQ pending bit.
Is there an advantage to one method over the other? I just tested the RBF method in my code and it seems to also work fine... Block until there is either another byte to read, or a stop bit has been seen.
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ? |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19529
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| Posted: Thu Dec 17, 2020 1:22 am |
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Some chips have errata on one. On these it is recommended to use RBF
rather than the interrupt. Also, though your chip doesn't support interrupt
on start/stop, a lot do. On these if you checked the interrupt, it might be
one of these, not the data.... |
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allenhuffman
Joined: 17 Jun 2019
Posts: 552
Location: Des Moines, Iowa, USA
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| Posted: Mon Nov 11, 2024 8:44 am |
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| allenhuffman wrote: | | I went down the "I2C bus reset" rabbit hole a year ago, seeing it mentioned and documented with ways to un-stick the lines. But, sadly, FTDI provides no way to do this from their Windows driver/API so we could never implement it :( |
I just wanted to add, since this was posted FTDI finally DID add a Bus Reset feature to its Windows driver.
Sadly, nothing we have tried (exhausting all the suggestions from FTDI) works at un-freezing a system when we get the real lockup. The FTDI chip seems unreliable when it gets messed up, and none of their Reset, Cycle Port, re-init routines will un-stick it. We have to power cycle the Windows computer when this happens ;-)
Windows is not an optimal solution for something you want to run reliably for months at a time ;-)
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ? |
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