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Code Issues Packages Projects Releases Wiki Activity

Update for consistency with the other docs

This commit is contained in:
Marcel Stör 2016-01-10 16:04:23 +01:00
parent 8d38cef044
commit 7eba3cbcf3
3 changed files with 503 additions and 539 deletions
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528
docs/en/modules/file.md
View File

@ -5,151 +5,6 @@ The file system is a flat file system, with no notion of directories/folders.
Only one file can be open at any given time. Only one file can be open at any given time.
## file.fsinfo()
Return size information for the file system, in bytes.
####Syntax
`file.fsinfo()`
####Parameters
`nil`
####Returns
- `remaining` (number)
- `used` (number)
- `total` (number)
####Example
```lua
-- get file system info
remaining, used, total=file.fsinfo()
print("\nFile system info:\nTotal : "..total.." Bytes\nUsed : "..used.." Bytes\nRemain: "..remaining.." Bytes\n")
```
```
___
## file.format()
Format the file system. Completely erases any existing file system and writes a new one. Depending on the size of the flash chip in the ESP, this may take several seconds.
####Syntax
`file.format()`
####Parameters
`nil`
####Returns
`nil`
####Example
```lua
file.format()
```
####See also
- `file.remove()`
___
## file.list()
Lists all files in the file system.
####Syntax
`file.list()`
####Parameters
`nil`
####Returns
a lua table which contains the {file name: file size} pairs
####Example
```lua
l = file.list();
for k,v in pairs(l) do
print("name:"..k..", size:"..v)
end
```
___
## file.remove()
Remove a file from the file system. The file must not be currently open.
###Syntax
`file.remove(filename)`
####Parameters
- `filename`: file to remove
####Returns
`nil`
####Example
```lua
-- remove "foo.lua" from file system.
file.remove("foo.lua")
```
####See also
- `file.open()`
___
## file.rename()
Renames a file. If a file is currently open, it will be closed first.
####Syntax
`file.rename(oldname, newname)`
####Parameters
- `oldname`: old file name
- `newname`: new file name
####Returns
`true` on success, `false` on error.
####Example
```lua
-- rename file 'temp.lua' to 'init.lua'.
file.rename("temp.lua","init.lua")
```
___
## file.open()
Opens a file for access, potentially creating it (for write modes).
When done with the file, it must be closed using `file.close()`.
####Syntax
`file.open(filename, mode)`
####Parameters
- `filename`: file to be opened, directories are not supported
- `mode`:
- "r": read mode (the default)<br />
- "w": write mode<br />
- "a": append mode<br />
- "r+": update mode, all previous data is preserved<br />
- "w+": update mode, all previous data is erased<br />
- "a+": append update mode, previous data is preserved, writing is only allowed at the end of file
####Returns
- `nil` if file not opened, or not exists (read modes). true` if file opened ok.
####Example
```lua
-- open 'init.lua', print the first line.
file.open("init.lua", "r")
print(file.readline())
file.close()
```
####See also
- `file.close()`
- `file.readline()`
___
## file.close() ## file.close()
Closes the open file, if any. Closes the open file, if any.
@ -158,13 +13,12 @@ Closes the open file, if any.
`file.close()` `file.close()`
#### Parameters #### Parameters
`nil` none
#### Returns #### Returns
`nil` `nil`
#### Example #### Example
```lua ```lua
-- open 'init.lua', print the first line. -- open 'init.lua', print the first line.
file.open("init.lua", "r") file.open("init.lua", "r")
@ -172,134 +26,17 @@ Closes the open file, if any.
file.close() file.close()
``` ```
#### See also #### See also
- `file.open()` [`file.open()`](#fileopen)
___
## file.readline()
Read the next line from the open file.
####Syntax
`file.readline()`
####Parameters
`nil`
####Returns
File content in string, line by line, include EOL('\n'). Return `nil` when EOF.
####Example
```lua
-- print the first line of 'init.lua'
file.open("init.lua", "r")
print(file.readline())
file.close()
```
####See also
- `file.open()`
- `file.close()`
- `file.read()`
___
## file.writeline()
Write a string to the open file and append '\n' at the end.
####Syntax
`file.writeline(string)`
####Parameters
- `string`: content to be write to file
####Returns
`true` if write ok, `nil` on error.
####Example
```lua
-- open 'init.lua' in 'a+' mode
file.open("init.lua", "a+")
-- write 'foo bar' to the end of the file
file.writeline('foo bar')
file.close()
```
####See also
- `file.open()`
- `file.readline()`
___
## file.read()
Read content from the open file.
####Syntax
`file.read([n_or_str])`
####Parameters
- `n_or_str`:
- if nothing passed in, read all byte in file.
- if pass a number n, then read n bytes from file, or EOF is reached.
- if pass a string "str", then read until 'str' or EOF is reached.
####Returns
File content in string, or nil when EOF.
####Example
```lua
-- print the first line of 'init.lua'
file.open("init.lua", "r")
print(file.read('\n'))
file.close()
-- print the first 5 byte of 'init.lua'
file.open("init.lua", "r")
print(file.read(5))
file.close()
```
####See also
- `file.open()`
- `file.readline()`
___
## file.write()
Write a string to the open file.
####Syntax
`file.write(string)`
####Parameters
`string`: content to be write to file.
####Returns
`true` if the write is ok, `nil` on error.
####Example
```lua
-- open 'init.lua' in 'a+' mode
file.open("init.lua", "a+")
-- write 'foo bar' to the end of the file
file.write('foo bar')
file.close()
```
####See also
- `file.open()`
- `file.writeline()`
___
## file.flush() ## file.flush()
Flushes any pending writes to the file system, ensuring no data is lost on a restart. Closing the open file using `file.close()` performs an implicit flush as well. Flushes any pending writes to the file system, ensuring no data is lost on a restart. Closing the open file using [`file.close()`](#fileclose) performs an implicit flush as well.
#### Syntax #### Syntax
`file.flush()` `file.flush()`
#### Parameters #### Parameters
`nil` none
#### Returns #### Returns
`nil` `nil`
@ -316,9 +53,202 @@ Flushes any pending writes to the file system, ensuring no data is lost on a res
file.close() file.close()
``` ```
#### See also #### See also
- `file.close()` [`file.close()`](#fileclose)
## file.format()
Format the file system. Completely erases any existing file system and writes a new one. Depending on the size of the flash chip in the ESP, this may take several seconds.
#### Syntax
`file.format()`
#### Parameters
none
#### Returns
`nil`
#### See also
[`file.remove()`](#fileremove)
## file.fsinfo()
Return size information for the file system, in bytes.
#### Syntax
`file.fsinfo()`
#### Parameters
none
#### Returns
- `remaining` (number)
- `used` (number)
- `total` (number)
#### Example
```lua
-- get file system info
remaining, used, total=file.fsinfo()
print("\nFile system info:\nTotal : "..total.." Bytes\nUsed : "..used.." Bytes\nRemain: "..remaining.." Bytes\n")
```
## file.list()
Lists all files in the file system.
#### Syntax
`file.list()`
#### Parameters
none
#### Returns
a lua table which contains the {file name: file size} pairs
#### Example
```lua
l = file.list();
for k,v in pairs(l) do
print("name:"..k..", size:"..v)
end
```
## file.open()
Opens a file for access, potentially creating it (for write modes).
When done with the file, it must be closed using `file.close()`.
#### Syntax
`file.open(filename, mode)`
#### Parameters
- `filename` file to be opened, directories are not supported
- `mode`:
- "r": read mode (the default)
- "w": write mode
- "a": append mode
- "r+": update mode, all previous data is preserved
- "w+": update mode, all previous data is erased
- "a+": append update mode, previous data is preserved, writing is only allowed at the end of file
#### Returns
`nil` if file not opened, or not exists (read modes). `true` if file opened ok.
#### Example
```lua
-- open 'init.lua', print the first line.
file.open("init.lua", "r")
print(file.readline())
file.close()
```
#### See also
- [`file.close()`](#fileclose)
- [`file.readline()`](#filereadline)
## file.read()
Read content from the open file.
#### Syntax
`file.read([n_or_str])`
#### Parameters
- `n_or_str`:
- if nothing passed in, read all byte in file
- if pass a number n, then read n bytes from file, or EOF is reached
- if pass a string "str", then read until 'str' or EOF is reached
#### Returns
fdile content in string, or nil when EOF
#### Example
```lua
-- print the first line of 'init.lua'
file.open("init.lua", "r")
print(file.read('\n'))
file.close()
-- print the first 5 byte of 'init.lua'
file.open("init.lua", "r")
print(file.read(5))
file.close()
```
#### See also
- [`file.open()`](#fileopen)
- [`file.readline()`](#filereadline)
## file.readline()
Read the next line from the open file.
#### Syntax
`file.readline()`
#### Parameters
none
#### Returns
File content in string, line by line, include EOL('\n'). Return `nil` when EOF.
#### Example
```lua
-- print the first line of 'init.lua'
file.open("init.lua", "r")
print(file.readline())
file.close()
```
#### See also
- [`file.open()`](#fileopen)
- [`file.close()`](#fileclose)
- [`file.read()`](#filereade)
## file.remove()
Remove a file from the file system. The file must not be currently open.
###Syntax
`file.remove(filename)`
#### Parameters
`filename` file to remove
#### Returns
`nil`
#### Example
```lua
-- remove "foo.lua" from file system.
file.remove("foo.lua")
```
#### See also
[`file.open()`](#fileopen)
## file.rename()
Renames a file. If a file is currently open, it will be closed first.
#### Syntax
`file.rename(oldname, newname)`
#### Parameters
- `oldname` old file name
- `newname` new file name
#### Returns
`true` on success, `false` on error.
#### Example
```lua
-- rename file 'temp.lua' to 'init.lua'.
file.rename("temp.lua","init.lua")
```
___
## file.seek() ## file.seek()
Sets and gets the file position, measured from the beginning of the file, to the position given by offset plus a base specified by the string whence. Sets and gets the file position, measured from the beginning of the file, to the position given by offset plus a base specified by the string whence.
@ -326,16 +256,16 @@ Sets and gets the file position, measured from the beginning of the file, to the
`file.seek([whence [, offset]])` `file.seek([whence [, offset]])`
#### Parameters #### Parameters
- `whence`: - `whence`
- "set": base is position 0 (beginning of the file) - "set": base is position 0 (beginning of the file)
- "cur": base is current position (default value) - "cur": base is current position (default value)
- "end": base is end of file - "end": base is end of file
- offset: default 0 - `offset` default 0
If no parameters are given, the function simply returns the current file offset. If no parameters are given, the function simply returns the current file offset.
#### Returns #### Returns
The resulting file position, or `nil` on error. the resulting file position, or `nil` on error
#### Example #### Example
```lua ```lua
@ -346,6 +276,56 @@ The resulting file position, or `nil` on error.
file.close() file.close()
``` ```
#### See also #### See also
- `file.open()` [`file.open()`](#fileopen)
___ ## file.write()
Write a string to the open file.
#### Syntax
`file.write(string)`
#### Parameters
`string` content to be write to file
#### Returns
`true` if the write is ok, `nil` on error
#### Example
```lua
-- open 'init.lua' in 'a+' mode
file.open("init.lua", "a+")
-- write 'foo bar' to the end of the file
file.write('foo bar')
file.close()
```
#### See also
- [`file.open()`](#fileopen)
- [`file.writeline()`](#filewriteline)
## file.writeline()
Write a string to the open file and append '\n' at the end.
#### Syntax
`file.writeline(string)`
#### Parameters
`string` content to be write to file
#### Returns
`true` if write ok, `nil` on error
#### Example
```lua
-- open 'init.lua' in 'a+' mode
file.open("init.lua", "a+")
-- write 'foo bar' to the end of the file
file.writeline('foo bar')
file.close()
```
#### See also
- [`file.open()`](#fileopen)
- [`file.readline()`](#filereadline)

393
docs/en/modules/tmr.md
View File

@ -4,29 +4,113 @@ The tmr module allows access to simple timers, the system counter and uptime.
It is aimed at setting up regularly occurring tasks, timing out operations, and provide low-resolution deltas. It is aimed at setting up regularly occurring tasks, timing out operations, and provide low-resolution deltas.
What the tmr module is *not* however, is a time keeping module. While most timeouts are expressed in milliseconds or even microseconds, the accuracy is limited and compounding errors would lead to rather inaccurate time keeping. Consider using the `rtctime` module for "wall clock" time. What the tmr module is *not* however, is a time keeping module. While most timeouts are expressed in milliseconds or even microseconds, the accuracy is limited and compounding errors would lead to rather inaccurate time keeping. Consider using the [rtctime](rtctime.md) module for "wall clock" time.
NodeMCU provides 7 timers, numbered 0-6. It is currently up to the user to keep track of which timers are used for what. NodeMCU provides 7 timers, numbered 0-6. It is currently up to the user to keep track of which timers are used for what.
## tmr.alarm()
This is a convenience function combining [`tmr.register()`](#tmrregister) and [`tmr.start()`](#tmrstart) into a single call.
To free up the resources with this timer when done using it, call [`tmr.unregister()`](#tmrunregister) on it. For one-shot timers this is not necessary, unless they were stopped before they expired.
#### Parameters
- `id` timer id (0-6)
- `interval_ms` timer interval in milliseconds. Maximum value is 12884901. In SDKs <= 1.5.0 values >6871948 result in incorrect behaviour.
- `mode` timer mode:
- `tmr.ALARM_SINGLE` a one-shot alarm (and no need to call [`tmr.unregister()`](#tmrunregister))
- `tmr.ALARM_SEMI` manually repeating alarm (call [`tmr.start()`](#tmrstart) to restart)
- `tmr.ALARM_AUTO` automatically repeating alarm
#### Returns
`true` if the timer was started, `false` on error
#### Example
```lua
if not tmr.alarm(0, 5000, tmr.ALARM_SINGLE, function() print("hey there") end) then print("whoopsie") end
```
#### See also #### See also
- rtctime module - [`tmr.register()`](#tmrregister)
- [`tmr.start()`](#tmrstart)
- [`tmr.unregister()`](#tmrunregister)
## tmr.delay()
Busyloops the processor for a specified number of microseconds.
This is in general a **bad** idea, because nothing else gets to run, and the networking stack (and other things) can fall over as a result. The only time `tmr.delay()` may be appropriate to use is if dealing with a peripheral device which needs a (very) brief delay between commands, or similar. *Use with caution!*
Also note that the actual amount of time delayed for may be noticeably greater, both as a result of timing inaccuracies as well as interrupts which may run during this time.
#### Syntax
`tmr.delay(us)`
#### Parameters
`us` microseconds to busyloop for
#### Returns
`nil`
#### Example
```lua
tmr.delay(100)
```
## tmr.interval()
Changes a registered timer's expiry interval.
#### Syntax
`tmr.interval(id, interval_ms)`
#### Parameters
- `id` timer id (0-6)
- `interval_ms` new timer interval in milliseconds. Maximum value is 12884901. In SDKs <= 1.5.0 values >6871948 result in incorrect behaviour.
#### Returns
`nil`
#### Example
```lua
tmr.register(0, 5000, tmr.ALARM_SINGLE, function() print("hey there") end)
tmr.interval(0, 3000) -- actually, 3 seconds is better!
```
## tmr.now()
Returns the system counter, which counts in microseconds. Limited to 31 bits, after that it wraps around back to zero. That is essential if you use this function to [debounce or throttle GPIO input](https://github.com/hackhitchin/esp8266-co-uk/issues/2).
#### Syntax
`tmr.now()`
#### Parameters
none
#### Returns
the current value of the system counter
#### Example
```lua
print(tmr.now())
print(tmr.now())
```
## tmr.register() ## tmr.register()
Configures a timer and registers the callback function to call on expiry. Configures a timer and registers the callback function to call on expiry.
To free up the resources with this timer when done using it, call `tmr.unregister()` on it. For one-shot timers this is not necessary, unless they were stopped before they expired. To free up the resources with this timer when done using it, call [`tmr.unregister()`](#tmrunregister) on it. For one-shot timers this is not necessary, unless they were stopped before they expired.
#### Syntax #### Syntax
`tmr.register(id, interval_ms, mode, func)` `tmr.register(id, interval_ms, mode, func)`
#### Parameters #### Parameters
- `id`: The timer id (0-6). - `id` timer id (0-6)
- `interval_ms`: timer interval in milliseconds. Maximum value is 12884901. In SDKs <= 1.5.0 values >6871948 result in incorrect behaviour. - `interval_ms` timer interval in milliseconds. Maximum value is 12884901. In SDKs <= 1.5.0 values >6871948 result in incorrect behaviour.
- `mode`: timer mode: - `mode` timer mode:
- `tmr.ALARM_SINGLE`: a one-shot alarm (and no need to call `tmr.unregister()`) - `tmr.ALARM_SINGLE` a one-shot alarm (and no need to call [`tmr.unregister()`](#tmrunregister))
- `tmr.ALARM_SEMI`: manually repeating alarm (call `tmr.start()` to restart) - `tmr.ALARM_SEMI` manually repeating alarm (call [`tmr.start()`](#tmrunregister) to restart)
- `tmr.ALARM_AUTO`: automatically repeating alarm - `tmr.ALARM_AUTO` automatically repeating alarm
Note that registering does *not* start the alarm. Note that registering does *not* start the alarm.
@ -39,183 +123,8 @@ tmr.register(0, 5000, tmr.ALARM_SINGLE, function() print("hey there") end)
tmr.start(0) tmr.start(0)
``` ```
#### See also #### See also
- `tmr.alarm()` [`tmr.alarm()`](#tmralarm)
___
## tmr.unregister()
Stops the timer (if running) and unregisters the associated callback.
This isn't necessary for one-shot timers (`tmr.ALARM_SINGLE`), as those automatically unregister themselves when fired.
####Syntax
`tmr.unregister(id)`
####Parameters
- `id`: The timer id (0-6).
####Returns
`nil`
####Example
```lua
tmr.unregister(0)
```
####See also
- `tmr.register()`
___
## tmr.start()
Starts or restarts a previously configured timer.
####Syntax
`tmr.start(id)`
####Parameters
- `id`: The timer id (0-6).
####Returns
True if the timer was started, false on error.
####Example
```lua
tmr.register(0, 5000, tmr.ALARM_SINGLE, function() print("hey there") end)
if not tmr.start(0) then print("uh oh") end
```
####See also
- `tmr.register()`
- `tmr.stop()`
- `tmr.unregister()`
___
## tmr.stop()
Stops a running timer, but does *not* unregister it. A stopped timer can be restarted with `tmr.start()`.
####Syntax
`tmr.stop(id)`
####Parameters
- `id`: The timer id (0-6).
####Returns
True if the timer was stopped, false on error.
####Example
```lua
if not tmr.stop(2) then print("timer 2 not stopped, not registered?") end
```
####See also
- `tmr.register()`
- `tmr.stop()`
- `tmr.unregister()`
___
## tmr.interval()
Changes a registered timer's expiry interval.
####Syntax
`tmr.interval(id, interval_ms)`
####Parameters
- `id`: The timer id (0-6).
- `interval_ms`: new timer interval in milliseconds.
####Returns
`nil`
####Example
```lua
tmr.register(0, 5000, tmr.ALARM_SINGLE, function() print("hey there") end)
tmr.interval(0, 3000) -- actually, 3 seconds is better!
```
___
## tmr.state()
Checks the state of a timer.
####Syntax
`tmr.state(id)`
####Parameters
- `id`: The timer id (0-6).
####Returns
(bool, int) or nil
If the specified timer is registered, returns whether it is currently started and its mode. If the timer is not registered, `nil` is returned.
####Example
```lua
running, mode = tmr.state(0)
```
___
## tmr.alarm()
This is a convenience function combining `tmr.register()` and `tmr.start()` into a single call.
To free up the resources with this timer when done using it, call `tmr.unregister()` on it. For one-shot timers this is not necessary, unless they were stopped before they expired.
####Parameters
- `id`: The timer id (0-6).
- `interval_ms`: timer interval in milliseconds.
- `mode`: timer mode:
- `tmr.ALARM_SINGLE`: a one-shot alarm (and no need to call `tmr.unregister()`)
- `tmr.ALARM_SEMI`: manually repeating alarm (call `tmr.start()` to restart)
- `tmr.ALARM_AUTO`: automatically repeating alarm
####Returns
True if the timer was started, false on error.
####Example
```lua
if not tmr.alarm(0, 5000, tmr.ALARM_SINGLE, function() print("hey there") end) then print("whoopsie") end
```
####See also
- `tmr.register()`
- `tmr.start()`
- `tmr.unregister()`
___
## tmr.now()
Returns the system counter, which counts in microseconds. Limited to 31 bits, after that it wraps around back to zero.
####Syntax
`tmr.now()`
####Parameters
`nil`
####Returns
The current value of the system counter.
####Example
```lua
print(tmr.now())
print(tmr.now())
```
___
## tmr.time()
Returns the system uptime, in seconds. Limited to 31 bits, after that it wraps around back to zero.
####Syntax
`tmr.time()`
####Parameter
`nil`
####Returns
The system uptime, in seconds, possibly wrapped around.
####Example
```lua
print("Uptime (probably):", tmr.time())
```
___
## tmr.softwd() ## tmr.softwd()
Provides a simple software watchdog, which needs to be re-armed or disabled before it expires, or the system will be restarted. Provides a simple software watchdog, which needs to be re-armed or disabled before it expires, or the system will be restarted.
@ -224,7 +133,7 @@ Provides a simple software watchdog, which needs to be re-armed or disabled befo
`tmr.softwd(timeout_s)` `tmr.softwd(timeout_s)`
#### Parameters #### Parameters
- `timeout_s`: watchdog timeout, in seconds. To disable the watchdog, use -1 (or any other negative value). `timeout_s` watchdog timeout, in seconds. To disable the watchdog, use -1 (or any other negative value).
#### Returns #### Returns
`nil` `nil`
@ -240,30 +149,112 @@ tmr.softwd(5)
-- go off and attempt to do whatever might need a restart to recover from -- go off and attempt to do whatever might need a restart to recover from
complex_stuff_which_might_never_call_the_callback(on_success_callback) complex_stuff_which_might_never_call_the_callback(on_success_callback)
``` ```
___
## tmr.delay()
Busyloops the processor for a specified number of microseconds. ## tmr.start()
This is in general a **bad** idea, because nothing else gets to run, and the Starts or restarts a previously configured timer.
networking stack (and other things) can fall over as a result. The only time `tmr.delay()` may be appropriate to use is if dealing with a peripheral device which needs a (very) brief delay between commands, or similar. *Use with caution!*
Also note that the actual amount of time delayed for may be noticeably greater, both as a result of timing inaccuracies as well as interrupts which may run during this time.
#### Syntax #### Syntax
`tmr.delay(us)` `tmr.start(id)`
#### Parameters #### Parameters
- `us`: microseconds to busyloop for. `id` timer id (0-6)
#### Returns
`true` if the timer was started, `false` on error
#### Example
```lua
tmr.register(0, 5000, tmr.ALARM_SINGLE, function() print("hey there") end)
if not tmr.start(0) then print("uh oh") end
```
#### See also
- [`tmr.register()`](#tmrregister)
- [`tmr.stop()`](#tmrstop)
- [`tmr.unregister()`](#tmrunregister)
## tmr.state()
Checks the state of a timer.
#### Syntax
`tmr.state(id)`
#### Parameters
`id` timer id (0-6)
#### Returns
(bool, int) or `nil`
If the specified timer is registered, returns whether it is currently started and its mode. If the timer is not registered, `nil` is returned.
#### Example
```lua
running, mode = tmr.state(0)
```
## tmr.stop()
Stops a running timer, but does *not* unregister it. A stopped timer can be restarted with [`tmr.start()`](#tmrstart).
#### Syntax
`tmr.stop(id)`
#### Parameters
`id` timer id (0-6)
#### Returns
`true` if the timer was stopped, `false` on error
#### Example
```lua
if not tmr.stop(2) then print("timer 2 not stopped, not registered?") end
```
#### See also
- [`tmr.register()`](#tmrregister)
- [`tmr.stop()`](#tmrstop)
- [`tmr.unregister()`](#tmrunregister)
## tmr.time()
Returns the system uptime, in seconds. Limited to 31 bits, after that it wraps around back to zero.
#### Syntax
`tmr.time()`
#### Parameters
none
#### Returns
the system uptime, in seconds, possibly wrapped around
#### Example
```lua
print("Uptime (probably):", tmr.time())
```
## tmr.unregister()
Stops the timer (if running) and unregisters the associated callback.
This isn't necessary for one-shot timers (`tmr.ALARM_SINGLE`), as those automatically unregister themselves when fired.
#### Syntax
`tmr.unregister(id)`
#### Parameters
`id` timer id (0-6)
#### Returns #### Returns
`nil` `nil`
#### Example #### Example
```lua ```lua
tmr.delay(100) tmr.unregister(0)
``` ```
___ #### See also
[`tmr.register()`](#tmrregister)
## tmr.wdclr() ## tmr.wdclr()
Feed the system watchdog. Feed the system watchdog.
@ -276,13 +267,7 @@ The event-driven model of NodeMCU means that there is no need to be sitting in h
`tmr.wdclr()` `tmr.wdclr()`
#### Parameters #### Parameters
`nil` none
#### Returns #### Returns
`nil` `nil`
####Example
```lua
tmr.wdclr()
```
___

101
docs/en/modules/uart.md
View File

@ -1,52 +1,9 @@
# uart Module # UART Module
The uart module allows configuration of and communication over the uart serial port. The [UART](https://en.wikipedia.org/wiki/Universal_asynchronous_receiver/transmitter) (Universal asynchronous receiver/transmitter) module allows configuration of and communication over the UART serial port.
## uart.setup()
(Re-)configures the communication parameters of the UART.
####Syntax
`uart.setup(id, baud, databits, parity, stopbits, echo)`
####Parameters
- `id`: Always zero, only one uart supported.
- `baud`: One of 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 74880, 115200, 230400, 460800, 921600, 1843200, 2686400.
- `databits`: One of 5, 6, 7, 8.
- `parity`: uart.PARITY_NONE, uart.PARITY_ODD, or uart.PARITY_EVEN.
- `stopbits`: uart.STOPBITS_1, uart.STOPBITS_1_5, or uart.STOPBITS_2.
- `echo`: if zero, disable echo, otherwise enable echo.
####Returns
number:configured baud rate
####Example
```lua
-- configure for 9600, 8N1, with echo
uart.setup(0, 9600, 8, uart.PARITY_NONE, uart.STOPBITS_1, 1)
```
___
## uart.write()
Write string or byte to the uart.
####Syntax
uart.write(id, data1 [, data2, ...])
####Parameters
- `id`: Always zero, only one uart supported.
- `data1`...: String or byte to send via uart.
####Returns
`nil`
####Example
```lua
uart.write(0, "Hello, world\n")
```
___
## uart.on() ## uart.on()
Sets the callback function to handle uart events. Sets the callback function to handle UART events.
Currently only the "data" event is supported. Currently only the "data" event is supported.
@ -54,13 +11,13 @@ Currently only the "data" event is supported.
`uart.on(method, [number/end_char], [function], [run_input])` `uart.on(method, [number/end_char], [function], [run_input])`
#### Parameters #### Parameters
- `method`: "data", data has been received on the uart - `method` "data", data has been received on the UART
- `number/end_char`: - `number/end_char`
- if pass in a number n<255, the callback will called when n chars are received. - if pass in a number n<255, the callback will called when n chars are received.
- if n=0, will receive every char in buffer. - if n=0, will receive every char in buffer.
- if pass in a one char string "c", the callback will called when "c" is encounterd, or max n=255 received. - if pass in a one char string "c", the callback will called when "c" is encounterd, or max n=255 received.
- `function`: callback function, event "data" has a callback like this: function(data) end - `function` callback function, event "data" has a callback like this: `function(data) end`
- `run_input`: 0 or 1; If 0, input from uart will not go into Lua interpreter, can accept binary data. If 1, input from uart will go into Lua interpreter, and run. - `run_input` 0 or 1. If 0, input from UART will not go into Lua interpreter, can accept binary data. If 1, input from UART will go into Lua interpreter, and run.
To unregister the callback, provide only the "data" parameter. To unregister the callback, provide only the "data" parameter.
@ -86,5 +43,47 @@ uart.on("data", "\r",
end end
end, 0) end, 0)
``` ```
___
## uart.setup()
(Re-)configures the communication parameters of the UART.
#### Syntax
`uart.setup(id, baud, databits, parity, stopbits, echo)`
#### Parameters
- `id` always zero, only one uart supported
- `baud` one of 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 74880, 115200, 230400, 460800, 921600, 1843200, 2686400
- `databits` one of 5, 6, 7, 8
- `parity` `uart.PARITY_NONE`, `uart.PARITY_ODD`, or `uart.PARITY_EVEN`
- `stopbits` `uart.STOPBITS_1`, `uart.STOPBITS_1_5`, or `uart.STOPBITS_2`
- `echo` if 0, disable echo, otherwise enable echo
#### Returns
configured baud rate (number)
#### Example
```lua
-- configure for 9600, 8N1, with echo
uart.setup(0, 9600, 8, uart.PARITY_NONE, uart.STOPBITS_1, 1)
```
## uart.write()
Write string or byte to the UART.
#### Syntax
`uart.write(id, data1 [, data2, ...])`
#### Parameters
- `id` always 0, only one UART supported
- `data1`... string or byte to send via UART
#### Returns
`nil`
#### Example
```lua
uart.write(0, "Hello, world\n")
```