i2c bus hangs in master RPi access to MSP430G uC ~1 in 1000 accesses Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern) Congratulation Joan for 50k!How to unbind i2c bus 0 from the i2c driver?Rpi Slave and Arduino MasterHow do I use the I2C bus?i2c requires restart before bus accessI2C Bus voltagepigpio: Bad I2C Busi2c dtoverlay bus numberEnabling Second I2C BUS Causes crashRPi I2C Master vs. slave with ArduinoI2C bus 0 not working, I2C bus 1 is
Delete free apps from library
Mounting TV on a weird wall that has some material between the drywall and stud
what is the log of the PDF for a Normal Distribution?
Putting class ranking in CV, but against dept guidelines
How many time has Arya actually used Needle?
Does the Black Tentacles spell do damage twice at the start of turn to an already restrained creature?
Google .dev domain strangely redirects to https
A term for a woman complaining about things/begging in a cute/childish way
Was Kant an Intuitionist about mathematical objects?
How were pictures turned from film to a big picture in a picture frame before digital scanning?
Printing attributes of selection in ArcPy?
Constant factor of an array
I can't produce songs
New Order #6: Easter Egg
What initially awakened the Balrog?
Did pre-Columbian Americans know the spherical shape of the Earth?
What is the "studentd" process?
Moving a wrapfig vertically to encroach partially on a subsection title
Did any compiler fully use 80-bit floating point?
Simple HTTP Server
If Windows 7 doesn't support WSL, then what is "Subsystem for UNIX-based Applications"?
Why not use the yoke to control yaw, as well as pitch and roll?
GDP with Intermediate Production
Is there public access to the Meteor Crater in Arizona?
i2c bus hangs in master RPi access to MSP430G uC ~1 in 1000 accesses
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)
Congratulation Joan for 50k!How to unbind i2c bus 0 from the i2c driver?Rpi Slave and Arduino MasterHow do I use the I2C bus?i2c requires restart before bus accessI2C Bus voltagepigpio: Bad I2C Busi2c dtoverlay bus numberEnabling Second I2C BUS Causes crashRPi I2C Master vs. slave with ArduinoI2C bus 0 not working, I2C bus 1 is
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
... resetting the MSP430 clears the hung state. I've slowed down the i2c clock freq, beefed up the PSupply, changed pull-up resistors - no change. However I made the "errors" increase significantly by busying the ARM with 2 calculation-intensive programs. I use Python in RPi, using smbus, SMBUS and
i2c_LCD_driver and try/except routines in the RPi to catch the bad access and reset the MSP - after that, accesses every 5 seconds continue fine until the next hang, ~1000 accesses later. I use C for the ISRs to manage interrupts in the MSP430.
I know both devices have hardware state machines that manage the i2c. Given that I can hang the bus by overworking the RPi, my suspicion was/is the implementation of the canned i2c python code. Is anyone aware of any weird
stuff about the Broadcom Serial Controller (BSC) i2c controller in the ARM that would hang a slave's state machine based on busy-ness of the OS managing the BSC ... or other cases of very intermittent bus hangs ?
i2c
asked 2 hours ago
JoeMJoeM
161
New contributor
JoeM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
... resetting the MSP430 clears the hung state. I've slowed down the i2c clock freq, beefed up the PSupply, changed pull-up resistors - no change. However I made the "errors" increase significantly by busying the ARM with 2 calculation-intensive programs. I use Python in RPi, using smbus, SMBUS and
i2c_LCD_driver and try/except routines in the RPi to catch the bad access and reset the MSP - after that, accesses every 5 seconds continue fine until the next hang, ~1000 accesses later. I use C for the ISRs to manage interrupts in the MSP430.
I know both devices have hardware state machines that manage the i2c. Given that I can hang the bus by overworking the RPi, my suspicion was/is the implementation of the canned i2c python code. Is anyone aware of any weird
stuff about the Broadcom Serial Controller (BSC) i2c controller in the ARM that would hang a slave's state machine based on busy-ness of the OS managing the BSC ... or other cases of very intermittent bus hangs ?
i2c
asked 2 hours ago
JoeMJoeM
161
New contributor
JoeM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
... resetting the MSP430 clears the hung state. I've slowed down the i2c clock freq, beefed up the PSupply, changed pull-up resistors - no change. However I made the "errors" increase significantly by busying the ARM with 2 calculation-intensive programs. I use Python in RPi, using smbus, SMBUS and
i2c_LCD_driver and try/except routines in the RPi to catch the bad access and reset the MSP - after that, accesses every 5 seconds continue fine until the next hang, ~1000 accesses later. I use C for the ISRs to manage interrupts in the MSP430.
I know both devices have hardware state machines that manage the i2c. Given that I can hang the bus by overworking the RPi, my suspicion was/is the implementation of the canned i2c python code. Is anyone aware of any weird
stuff about the Broadcom Serial Controller (BSC) i2c controller in the ARM that would hang a slave's state machine based on busy-ness of the OS managing the BSC ... or other cases of very intermittent bus hangs ?
i2c
asked 2 hours ago
JoeMJoeM
161
New contributor
JoeM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
... resetting the MSP430 clears the hung state. I've slowed down the i2c clock freq, beefed up the PSupply, changed pull-up resistors - no change. However I made the "errors" increase significantly by busying the ARM with 2 calculation-intensive programs. I use Python in RPi, using smbus, SMBUS and
i2c_LCD_driver and try/except routines in the RPi to catch the bad access and reset the MSP - after that, accesses every 5 seconds continue fine until the next hang, ~1000 accesses later. I use C for the ISRs to manage interrupts in the MSP430.
I know both devices have hardware state machines that manage the i2c. Given that I can hang the bus by overworking the RPi, my suspicion was/is the implementation of the canned i2c python code. Is anyone aware of any weird
stuff about the Broadcom Serial Controller (BSC) i2c controller in the ARM that would hang a slave's state machine based on busy-ness of the OS managing the BSC ... or other cases of very intermittent bus hangs ?
i2c
i2c
asked 2 hours ago
JoeMJoeM
161
New contributor
JoeM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 hours ago
JoeMJoeM
161
New contributor
JoeM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 hours ago
JoeMJoeM
161
New contributor
JoeM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 hours ago
JoeMJoeM
161
asked 2 hours ago
JoeMJoeM
161
161
New contributor
JoeM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
JoeM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
JoeM is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Question
... I've slowed down the i2c clock freq ...
Answer
I am using RPi3B+ stretch 2019apr python 3.5.3.
I surprisingly and sadly experienced, and read that Rpi3B+ stretch python 3.5x I2C is buggy.
I could never have slowed down the default I2C 100kHz. I tried to change speed up to 400kHz and down to 50kHz. But hardware did not respond - no nothing changed. :(
I read that it is a hardware bug. Are you sure you have actually successfully changed the speed? I vaguely remember that I could indeed change the speed when I was in jessie or earlier days.
I also found that python 3.5.3 block read does not fully implement to entertain all the parameter patterns. My projects were "hung" and much time wasted. :(
I am anxiously waiting for the coming soon Rpi4 to hopefully resume my couple of long stalled I2C related projects. In the meaning time I am switching to SPI (I2C MCP23017 to SPI MCP23S17, etc)
Update 2019apr21hkt1156
I did try smbus2 but sadly encountered other compatibility problems. :(
References
Rpi3 I2C Baud Rate Setting - samtal 2018aug04
/ to continue, ...
answered 1 hour ago
tlfong01tlfong01
832312
add a comment |
Your Answer
StackExchange.ifUsing("editor", function ()
return StackExchange.using("schematics", function ()
StackExchange.schematics.init();
);
, "cicuitlab");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "447"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
JoeM is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fraspberrypi.stackexchange.com%2fquestions%2f96748%2fi2c-bus-hangs-in-master-rpi-access-to-msp430g-uc-1-in-1000-accesses%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Question
... I've slowed down the i2c clock freq ...
Answer
I am using RPi3B+ stretch 2019apr python 3.5.3.
I surprisingly and sadly experienced, and read that Rpi3B+ stretch python 3.5x I2C is buggy.
I could never have slowed down the default I2C 100kHz. I tried to change speed up to 400kHz and down to 50kHz. But hardware did not respond - no nothing changed. :(
I read that it is a hardware bug. Are you sure you have actually successfully changed the speed? I vaguely remember that I could indeed change the speed when I was in jessie or earlier days.
I also found that python 3.5.3 block read does not fully implement to entertain all the parameter patterns. My projects were "hung" and much time wasted. :(
I am anxiously waiting for the coming soon Rpi4 to hopefully resume my couple of long stalled I2C related projects. In the meaning time I am switching to SPI (I2C MCP23017 to SPI MCP23S17, etc)
Update 2019apr21hkt1156
I did try smbus2 but sadly encountered other compatibility problems. :(
References
Rpi3 I2C Baud Rate Setting - samtal 2018aug04
/ to continue, ...
answered 1 hour ago
tlfong01tlfong01
832312
add a comment |
Question
... I've slowed down the i2c clock freq ...
Answer
I am using RPi3B+ stretch 2019apr python 3.5.3.
I surprisingly and sadly experienced, and read that Rpi3B+ stretch python 3.5x I2C is buggy.
I could never have slowed down the default I2C 100kHz. I tried to change speed up to 400kHz and down to 50kHz. But hardware did not respond - no nothing changed. :(
I read that it is a hardware bug. Are you sure you have actually successfully changed the speed? I vaguely remember that I could indeed change the speed when I was in jessie or earlier days.
I also found that python 3.5.3 block read does not fully implement to entertain all the parameter patterns. My projects were "hung" and much time wasted. :(
I am anxiously waiting for the coming soon Rpi4 to hopefully resume my couple of long stalled I2C related projects. In the meaning time I am switching to SPI (I2C MCP23017 to SPI MCP23S17, etc)
Update 2019apr21hkt1156
I did try smbus2 but sadly encountered other compatibility problems. :(
References
Rpi3 I2C Baud Rate Setting - samtal 2018aug04
/ to continue, ...
answered 1 hour ago
tlfong01tlfong01
832312
add a comment |
Question
... I've slowed down the i2c clock freq ...
Answer
I am using RPi3B+ stretch 2019apr python 3.5.3.
I surprisingly and sadly experienced, and read that Rpi3B+ stretch python 3.5x I2C is buggy.
I could never have slowed down the default I2C 100kHz. I tried to change speed up to 400kHz and down to 50kHz. But hardware did not respond - no nothing changed. :(
I read that it is a hardware bug. Are you sure you have actually successfully changed the speed? I vaguely remember that I could indeed change the speed when I was in jessie or earlier days.
I also found that python 3.5.3 block read does not fully implement to entertain all the parameter patterns. My projects were "hung" and much time wasted. :(
I am anxiously waiting for the coming soon Rpi4 to hopefully resume my couple of long stalled I2C related projects. In the meaning time I am switching to SPI (I2C MCP23017 to SPI MCP23S17, etc)
Update 2019apr21hkt1156
I did try smbus2 but sadly encountered other compatibility problems. :(
References
Rpi3 I2C Baud Rate Setting - samtal 2018aug04
/ to continue, ...
answered 1 hour ago
tlfong01tlfong01
832312
Question
... I've slowed down the i2c clock freq ...
Answer
I am using RPi3B+ stretch 2019apr python 3.5.3.
I surprisingly and sadly experienced, and read that Rpi3B+ stretch python 3.5x I2C is buggy.
I could never have slowed down the default I2C 100kHz. I tried to change speed up to 400kHz and down to 50kHz. But hardware did not respond - no nothing changed. :(
I read that it is a hardware bug. Are you sure you have actually successfully changed the speed? I vaguely remember that I could indeed change the speed when I was in jessie or earlier days.
I also found that python 3.5.3 block read does not fully implement to entertain all the parameter patterns. My projects were "hung" and much time wasted. :(
I am anxiously waiting for the coming soon Rpi4 to hopefully resume my couple of long stalled I2C related projects. In the meaning time I am switching to SPI (I2C MCP23017 to SPI MCP23S17, etc)
Update 2019apr21hkt1156
I did try smbus2 but sadly encountered other compatibility problems. :(
References
Rpi3 I2C Baud Rate Setting - samtal 2018aug04
/ to continue, ...
answered 1 hour ago
tlfong01tlfong01
832312
edited 33 mins ago
answered 1 hour ago
tlfong01tlfong01
832312
answered 1 hour ago
tlfong01tlfong01
832312
answered 1 hour ago
tlfong01tlfong01
832312
832312
add a comment |
add a comment |
JoeM is a new contributor. Be nice, and check out our Code of Conduct.
JoeM is a new contributor. Be nice, and check out our Code of Conduct.
JoeM is a new contributor. Be nice, and check out our Code of Conduct.
JoeM is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Raspberry Pi Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fraspberrypi.stackexchange.com%2fquestions%2f96748%2fi2c-bus-hangs-in-master-rpi-access-to-msp430g-uc-1-in-1000-accesses%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
