OVMS3-idf/docs/api-reference/peripherals/uart.rst
michael 08b9fbc242 feat(global): add macros for GPIO->channel lookup
including: macros for dac, adc, touch, rtc_gpio, uart and clk_out.

TW#13970
2017-09-07 10:40:25 +08:00

34 lines
945 B
ReStructuredText

UART
====
Overview
--------
`Instructions`_
.. _Instructions: ../template.html
Application Example
-------------------
Configure uart settings and install uart driver to read/write using UART0 and UART1 interfaces: :example:`peripherals/uart`.
API Reference
-------------
.. include:: /_build/inc/uart.inc
GPIO Lookup Macros
^^^^^^^^^^^^^^^^^^
Some useful macros can be used to specified the **direct** GPIO (UART module connected to pads through direct IO mux without the GPIO mux) number of a UART channel, or vice versa.
The pin name can be omitted if specify the channel of a GPIO num.
e.g.
1. ``UART_NUM_2_TXD_DIRECT_GPIO_NUM`` is the GPIO number of UART channel 2 TXD pin (17);
2. ``UART_GPIO19_DIRECT_CHANNEL`` is the UART channel number of GPIO 19 (channel 0);
3. ``UART_CTS_GPIO19_DIRECT_CHANNEL`` is the UART channel number of GPIO 19, and GPIO 19 must be a CTS pin (channel 0).
.. include:: /_build/inc/uart_channel.inc