You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
1.5 KiB
ReStructuredText
59 lines
1.5 KiB
ReStructuredText
The USART Synchronous Driver
|
|
============================
|
|
|
|
The universal synchronous and asynchronous receiver and transmitter
|
|
(USART) is usually used to transfer data from one device to the other.
|
|
|
|
User can set action for flow control pins by function usart_set_flow_control,
|
|
if the flow control is enabled. All the available states are defined in union
|
|
usart_flow_control_state.
|
|
|
|
Note that user can set state of flow control pins only if automatic support of
|
|
the flow control is not supported by the hardware.
|
|
|
|
Features
|
|
--------
|
|
|
|
* Initialization/de-initialization
|
|
* Enabling/disabling
|
|
* Control of the following settings:
|
|
|
|
* Baudrate
|
|
* UART or USRT communication mode
|
|
* Character size
|
|
* Data order
|
|
* Flow control
|
|
* Data transfer: transmission, reception
|
|
|
|
Applications
|
|
------------
|
|
|
|
They are commonly used in a terminal application or low-speed communication
|
|
between devices.
|
|
|
|
Dependencies
|
|
------------
|
|
|
|
USART capable hardware.
|
|
|
|
Concurrency
|
|
-----------
|
|
|
|
Write buffer should not be changed while data is being sent.
|
|
|
|
|
|
Limitations
|
|
-----------
|
|
|
|
* The driver does not support 9-bit character size.
|
|
* The "USART with ISO7816" mode can be only used in ISO7816 capable devices.
|
|
And the SCK pin can't be set directly. Application can use a GCLK output PIN
|
|
to generate SCK. For example to communicate with a SMARTCARD with ISO7816
|
|
(F = 372 ; D = 1), and baudrate=9600, the SCK pin output frequency should be
|
|
config as 372*9600=3571200Hz. More information can be refer to ISO7816 Specification.
|
|
|
|
Known issues and workarounds
|
|
----------------------------
|
|
|
|
N/A
|