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samples: stm32: mco: Update sample to use dts instead of Kconfig

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Update MCO board sample to use devicetree information instead of Kconfig
configurations.

Signed-off-by: Joakim Andersson <joerchan@gmail.com>
This commit is contained in:
Joakim Andersson 2024-07-31 12:00:15 +02:00 committed by Carles Cufí
parent a624fe0f3d
commit 438ed89238
4 changed files with 34 additions and 17 deletions
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2
samples/boards/st/mco/README.rst
View file

@ -14,7 +14,7 @@ Requirements
************
The SoC should support MCO functionality and use a pin that has the MCO alternate function.
To support another board, add an overlay in boards folder.
To support another board, add a dts overlay file in boards folder.
Make sure that the output clock is enabled in dts overlay file.

22
samples/boards/st/mco/boards/nucleo_u5a5zj_q.overlay
View file

@ -3,10 +3,20 @@
status = "okay";
};
/ {
zephyr,user {
/* Select MCO pin to use. */
pinctrl-0 = <&rcc_mco_pa8>;
pinctrl-names = "default";
};
/* See reference manual (RM0456):
* 0b0111: LSE clock selected
*/
#define MCO1_SEL_LSE 7
/* See reference manual (RM0456):
* 0b001: MCO divided by 2
*/
#define MCO1_PRE_DIV_2 1
&mco1 {
status = "okay";
clocks = <&rcc STM32_SRC_LSE MCO1_SEL(MCO1_SEL_LSE)>;
prescaler = <MCO1_PRE(MCO1_PRE_DIV_2)>;
pinctrl-0 = <&rcc_mco_pa8>;
pinctrl-names = "default";
};

4
samples/boards/st/mco/prj.conf
View file

@ -1,3 +1 @@
# Set MCO1 source to desired clock.
CONFIG_CLOCK_STM32_MCO1_SRC_LSE=y
CONFIG_CLOCK_STM32_MCO1_DIV=1
# Empty

23
samples/boards/st/mco/src/main.c
View file

@ -7,15 +7,24 @@
#include <zephyr/kernel.h>
#include <zephyr/drivers/pinctrl.h>
/* Define the pinctrl information for the MCO pin. */
PINCTRL_DT_DEFINE(DT_PATH(zephyr_user));
int main(void)
{
/* Configure the MCO pin using pinctrl in order to set the alternate function of the pin. */
const struct pinctrl_dev_config *pcfg = PINCTRL_DT_DEV_CONFIG_GET(DT_PATH(zephyr_user));
(void)pinctrl_apply_state(pcfg, PINCTRL_STATE_DEFAULT);
const struct device *dev;
printk("\nMCO pin configured, end of example.\n");
/* This sample demonstrates MCO usage via Device Tree.
* MCO configuration is performed in the Device Tree overlay files.
* Each MCO will be enabled automatically by the driver during device
* initialization. This sample checks that all MCOs are ready - if so,
* the selected clock should be visible on the chosen GPIO pin.
*/
dev = DEVICE_DT_GET(DT_NODELABEL(mco1));
if (device_is_ready(dev)) {
printk("MCO1 device successfully configured\n");
} else {
printk("MCO1 device not ready\n");
return -1;
}
printk("\nDisplayed the status of all MCO devices - end of example.\n");
return 0;
}