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documentation: add information about SAMv7 1 wire support 

Signed-off-by: Michal Lenc <michallenc@seznam.cz>
This commit is contained in:
Michal Lenc 2023-09-20 08:33:57 +02:00 committed by Xiang Xiao
parent c5209e6189
commit 0a2c79034f
1 changed files with 7 additions and 0 deletions
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7
Documentation/platforms/arm/samv7/index.rst
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@ -59,6 +59,7 @@ The following list indicates peripherals supported in NuttX:
========== =======
Peripheral Support
========== =======
1Wire Yes
ACC No
AES No
AFEC Yes
@ -289,6 +290,12 @@ is required to configure idle bus timeout value in ``CONFIG_SAMV7_SERIAL_DMA_TIM
ensures data are read from the DMA buffer even if it is not full yet. TX DMA support is not implemented
as well as entire DMA support for UART peripheral.
USART/UART can be also used to emulate 1 wire interface. SAMv7 MCUs do not have build in support for
1 wire therefore external hardware as TX/RX connection or optical isolation might be required. Selecting
``CONFIG_SAMV7_UARTx_1WIREDRIVER`` enables 1 wire driver and sets USART/UART peripheral to this mode.
Output pins are configured as if serial mode was selected plus TX is open drain. SAMv7 part of the driver
is initialized by :c:func:`sam_1wireinitialize` with port number as an argument.
Watchdog Timer (WDT)
---------------------