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samples: boards: stm32 serial wakeup form LPUART on nucleo_wl55jc

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This overlay shows the LPUART at 9600 with wakeUp capability
to exit the nucleo_wl55jc target plaform from the low Power
stop mode, EXTI_Line 28 is the corresponding wakeUp source.
The LPUART is sourced by the LSE (32768Hz) and max baudrate
is 9600. Set the console to 9600.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2022-09-12 16:24:57 +02:00 • committed by Fabio Baltieri
commit 44b9cde054
1 changed files with 20 additions and 0 deletions
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samples/boards/stm32/power_mgmt/serial_wakeup/boards/nucleo_wl55jc.overlay Normal file
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/*
* Copyright (c) 2022 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*/
&clk_lse {
status = "okay";
};
/* LPUART1 clock source on LSE : set console at 9600 */
&lpuart1 {
/delete-property/ clocks;
clocks = <&rcc STM32_CLOCK_BUS_APB1_2 0x00000001>,
<&rcc STM32_SRC_LSE LPUART1_SEL(3)>;
current-speed = <9600>;
wakeup-source;
wakeup-line = <28>;
};