i2c bus hangs in master RPi access to MSP430G uC ~1 in 1000 accesses Announcing the arrival of...
Asymptotics question
White walkers, cemeteries and wights
Did pre-Columbian Americans know the spherical shape of the Earth?
What does the writing on Poe's helmet say?
i2c bus hangs in master RPi access to MSP430G uC ~1 in 1000 accesses
Simple HTTP Server
Is multiple magic items in one inherently imbalanced?
I got rid of Mac OSX and replaced it with linux but now I can't change it back to OSX or windows
Tips to organize LaTeX presentations for a semester
Caught masturbating at work
Weaponising the Grasp-at-a-Distance spell
Why is it faster to reheat something than it is to cook it?
Google .dev domain strangely redirects to https
How much damage would a cupful of neutron star matter do to the Earth?
What order were files/directories output in dir?
Co-worker has annoying ringtone
Trying to understand entropy as a novice in thermodynamics
What is a more techy Technical Writer job title that isn't cutesy or confusing?
Why is the change of basis formula counter-intuitive? [See details]
I can't produce songs
Is it dangerous to install hacking tools on my private linux machine?
Most effective melee weapons for arboreal combat? (pre-gunpowder technology)
Why shouldn't this prove the Prime Number Theorem?
If Windows 7 doesn't support WSL, then what is "Subsystem for UNIX-based Applications"?
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 1 hour 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 1 hour 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 1 hour 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 1 hour 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 1 hour 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 1 hour 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 1 hour ago
JoeMJoeM
161
asked 1 hour 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
I've slowed down the i2c clock freq
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 found other compatibility problems.
References
RASPBERRY PI3 I2C BAUD RATE SETTING Postby samtal » 2018-Aug-04 Sat 1:45 pm
/ to continue, ...
answered 49 mins 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
I've slowed down the i2c clock freq
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 found other compatibility problems.
References
RASPBERRY PI3 I2C BAUD RATE SETTING Postby samtal » 2018-Aug-04 Sat 1:45 pm
/ to continue, ...
answered 49 mins ago
tlfong01tlfong01
832312
add a comment |
I've slowed down the i2c clock freq
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 found other compatibility problems.
References
RASPBERRY PI3 I2C BAUD RATE SETTING Postby samtal » 2018-Aug-04 Sat 1:45 pm
/ to continue, ...
answered 49 mins ago
tlfong01tlfong01
832312
add a comment |
I've slowed down the i2c clock freq
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 found other compatibility problems.
References
RASPBERRY PI3 I2C BAUD RATE SETTING Postby samtal » 2018-Aug-04 Sat 1:45 pm
/ to continue, ...
answered 49 mins ago
tlfong01tlfong01
832312
I've slowed down the i2c clock freq
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 found other compatibility problems.
References
RASPBERRY PI3 I2C BAUD RATE SETTING Postby samtal » 2018-Aug-04 Sat 1:45 pm
/ to continue, ...
answered 49 mins ago
tlfong01tlfong01
832312
edited 24 mins ago
answered 49 mins ago
tlfong01tlfong01
832312
answered 49 mins ago
tlfong01tlfong01
832312
answered 49 mins 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
