Impact of using UART
I'm trying to understand the impact of using UART communication of the Raspberry's GPIO pins. So I'm reading the Raspberry UART documentation, but I'm not sure if I get everything right.
It says:
By default, on Raspberry Pis equipped with the wireless/Bluetooth module (Raspberry Pi 3 and Raspberry Pi Zero W), the PL011 UART is connected to the BT module
I'm not sure what "connected" means in this context. Because it says "by default", it seems to me that there are other options, potentially configurable, so it's just a software connection.
Later, the documentation says
pi3-disable-btdisables the Bluetooth device and restores UART0/ttyAMA0 to GPIOs 14 and 15.
So does "connected" mean that a) the bluetooth data is forwarded/copied to the PL011 UART (one-way)? Or b) does it also mean that writing to the GPIO pins will send data over bluetooth (two-way)? Or c) the connection between Bluetooth and UART on GPIO pins is an exclusive one. You could either use Bluetooth or use UART.
Last, I have a question on the sentence
pi3-miniuart-btswitches the Raspberry Pi 3 and Raspberry Pi Zero W Bluetooth function to use the mini UART (ttyS0), and restores UART0/ttyAMA0 to GPIOs 14 and 15.
in combination with
The particular deficiencies of the mini UART compared to the PL011 are : [...] [long list of disadvantages]
Since I need Bluetooth and UART, this seems to be the right option to me. Does Bluetooth work really fine using the Mini-UART? I definitely don't like to have Bluetooth issues.
bluetooth uart
asked 4 hours ago
Thomas Weller
1,15011135
add a comment |
I'm trying to understand the impact of using UART communication of the Raspberry's GPIO pins. So I'm reading the Raspberry UART documentation, but I'm not sure if I get everything right.
It says:
By default, on Raspberry Pis equipped with the wireless/Bluetooth module (Raspberry Pi 3 and Raspberry Pi Zero W), the PL011 UART is connected to the BT module
I'm not sure what "connected" means in this context. Because it says "by default", it seems to me that there are other options, potentially configurable, so it's just a software connection.
Later, the documentation says
pi3-disable-btdisables the Bluetooth device and restores UART0/ttyAMA0 to GPIOs 14 and 15.
So does "connected" mean that a) the bluetooth data is forwarded/copied to the PL011 UART (one-way)? Or b) does it also mean that writing to the GPIO pins will send data over bluetooth (two-way)? Or c) the connection between Bluetooth and UART on GPIO pins is an exclusive one. You could either use Bluetooth or use UART.
Last, I have a question on the sentence
pi3-miniuart-btswitches the Raspberry Pi 3 and Raspberry Pi Zero W Bluetooth function to use the mini UART (ttyS0), and restores UART0/ttyAMA0 to GPIOs 14 and 15.
in combination with
The particular deficiencies of the mini UART compared to the PL011 are : [...] [long list of disadvantages]
Since I need Bluetooth and UART, this seems to be the right option to me. Does Bluetooth work really fine using the Mini-UART? I definitely don't like to have Bluetooth issues.
bluetooth uart
asked 4 hours ago
Thomas Weller
1,15011135
add a comment |
I'm trying to understand the impact of using UART communication of the Raspberry's GPIO pins. So I'm reading the Raspberry UART documentation, but I'm not sure if I get everything right.
It says:
By default, on Raspberry Pis equipped with the wireless/Bluetooth module (Raspberry Pi 3 and Raspberry Pi Zero W), the PL011 UART is connected to the BT module
I'm not sure what "connected" means in this context. Because it says "by default", it seems to me that there are other options, potentially configurable, so it's just a software connection.
Later, the documentation says
pi3-disable-btdisables the Bluetooth device and restores UART0/ttyAMA0 to GPIOs 14 and 15.
So does "connected" mean that a) the bluetooth data is forwarded/copied to the PL011 UART (one-way)? Or b) does it also mean that writing to the GPIO pins will send data over bluetooth (two-way)? Or c) the connection between Bluetooth and UART on GPIO pins is an exclusive one. You could either use Bluetooth or use UART.
Last, I have a question on the sentence
pi3-miniuart-btswitches the Raspberry Pi 3 and Raspberry Pi Zero W Bluetooth function to use the mini UART (ttyS0), and restores UART0/ttyAMA0 to GPIOs 14 and 15.
in combination with
The particular deficiencies of the mini UART compared to the PL011 are : [...] [long list of disadvantages]
Since I need Bluetooth and UART, this seems to be the right option to me. Does Bluetooth work really fine using the Mini-UART? I definitely don't like to have Bluetooth issues.
bluetooth uart
asked 4 hours ago
Thomas Weller
1,15011135
I'm trying to understand the impact of using UART communication of the Raspberry's GPIO pins. So I'm reading the Raspberry UART documentation, but I'm not sure if I get everything right.
It says:
By default, on Raspberry Pis equipped with the wireless/Bluetooth module (Raspberry Pi 3 and Raspberry Pi Zero W), the PL011 UART is connected to the BT module
I'm not sure what "connected" means in this context. Because it says "by default", it seems to me that there are other options, potentially configurable, so it's just a software connection.
Later, the documentation says
pi3-disable-btdisables the Bluetooth device and restores UART0/ttyAMA0 to GPIOs 14 and 15.
So does "connected" mean that a) the bluetooth data is forwarded/copied to the PL011 UART (one-way)? Or b) does it also mean that writing to the GPIO pins will send data over bluetooth (two-way)? Or c) the connection between Bluetooth and UART on GPIO pins is an exclusive one. You could either use Bluetooth or use UART.
Last, I have a question on the sentence
pi3-miniuart-btswitches the Raspberry Pi 3 and Raspberry Pi Zero W Bluetooth function to use the mini UART (ttyS0), and restores UART0/ttyAMA0 to GPIOs 14 and 15.
in combination with
The particular deficiencies of the mini UART compared to the PL011 are : [...] [long list of disadvantages]
Since I need Bluetooth and UART, this seems to be the right option to me. Does Bluetooth work really fine using the Mini-UART? I definitely don't like to have Bluetooth issues.
bluetooth uart
bluetooth uart
asked 4 hours ago
Thomas Weller
1,15011135
asked 4 hours ago
Thomas Weller
1,15011135
asked 4 hours ago
Thomas Weller
1,15011135
asked 4 hours ago
Thomas Weller
1,15011135
asked 4 hours ago
Thomas Weller
1,15011135
1,15011135
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
The three options are:
default configuration
- UART0/ttyAMA0 to Bluetooth
- Mini-UART/dev/ttyS0 to GPIOs 14 and 15
pi3-disable-bt
- no Bluetooth support
- UART0/ttyAMA0 to GPIOs 14 and 15
pi3-miniuart-bt
- Mini-UART/ttyS0 connected to Bluetooth
- UART0/ttyAMA0 to GPIOs 14 and 15
In general, the Mini-UART has one big pitfall. It doesn't have its own clock source, so the UART bitrate depends on the CPU clock. Which means you have to set a fixed CPU clock for reliable communication. For serial console this is usually not a problem because it's a debugging tool.
answered 3 hours ago
Janka
1,284310
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
});
}
});
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%2f92505%2fimpact-of-using-uart%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
The three options are:
default configuration
- UART0/ttyAMA0 to Bluetooth
- Mini-UART/dev/ttyS0 to GPIOs 14 and 15
pi3-disable-bt
- no Bluetooth support
- UART0/ttyAMA0 to GPIOs 14 and 15
pi3-miniuart-bt
- Mini-UART/ttyS0 connected to Bluetooth
- UART0/ttyAMA0 to GPIOs 14 and 15
In general, the Mini-UART has one big pitfall. It doesn't have its own clock source, so the UART bitrate depends on the CPU clock. Which means you have to set a fixed CPU clock for reliable communication. For serial console this is usually not a problem because it's a debugging tool.
answered 3 hours ago
Janka
1,284310
add a comment |
The three options are:
default configuration
- UART0/ttyAMA0 to Bluetooth
- Mini-UART/dev/ttyS0 to GPIOs 14 and 15
pi3-disable-bt
- no Bluetooth support
- UART0/ttyAMA0 to GPIOs 14 and 15
pi3-miniuart-bt
- Mini-UART/ttyS0 connected to Bluetooth
- UART0/ttyAMA0 to GPIOs 14 and 15
In general, the Mini-UART has one big pitfall. It doesn't have its own clock source, so the UART bitrate depends on the CPU clock. Which means you have to set a fixed CPU clock for reliable communication. For serial console this is usually not a problem because it's a debugging tool.
answered 3 hours ago
Janka
1,284310
add a comment |
The three options are:
default configuration
- UART0/ttyAMA0 to Bluetooth
- Mini-UART/dev/ttyS0 to GPIOs 14 and 15
pi3-disable-bt
- no Bluetooth support
- UART0/ttyAMA0 to GPIOs 14 and 15
pi3-miniuart-bt
- Mini-UART/ttyS0 connected to Bluetooth
- UART0/ttyAMA0 to GPIOs 14 and 15
In general, the Mini-UART has one big pitfall. It doesn't have its own clock source, so the UART bitrate depends on the CPU clock. Which means you have to set a fixed CPU clock for reliable communication. For serial console this is usually not a problem because it's a debugging tool.
answered 3 hours ago
Janka
1,284310
The three options are:
default configuration
- UART0/ttyAMA0 to Bluetooth
- Mini-UART/dev/ttyS0 to GPIOs 14 and 15
pi3-disable-bt
- no Bluetooth support
- UART0/ttyAMA0 to GPIOs 14 and 15
pi3-miniuart-bt
- Mini-UART/ttyS0 connected to Bluetooth
- UART0/ttyAMA0 to GPIOs 14 and 15
In general, the Mini-UART has one big pitfall. It doesn't have its own clock source, so the UART bitrate depends on the CPU clock. Which means you have to set a fixed CPU clock for reliable communication. For serial console this is usually not a problem because it's a debugging tool.
answered 3 hours ago
Janka
1,284310
answered 3 hours ago
Janka
1,284310
answered 3 hours ago
Janka
1,284310
answered 3 hours ago
Janka
1,284310
1,284310
add a comment |
add a comment |
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.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- 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%2f92505%2fimpact-of-using-uart%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
