[WIP] add power management to the stm32 spi driver #32544
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This will activate the LPTIM for the test sequence once the power management is enabled Signed-off-by: Francois Ramu <[email protected]>
This sample uses the lptim when calling the k_sleep for the STM32xx from STMicroelectronics. Using new DT for button and Led, Button is ready to exit from low power state. Signed-off-by: Francois Ramu <[email protected]>
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Signed-off-by: Francois Ramu <[email protected]>
This sample uses is demonstrating the spi transfer followed by a low power period. The lptim is the timer to program the low power mode. The button is ready to exit from low power state. Signed-off-by: Francois Ramu <[email protected]>
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| /* Configure LEDs */ | ||
| gpio_led = device_get_binding(LED0); | ||
| if (gpio_led == NULL) { |
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You can assert here, or log the error, otherwise it will silent fail what is not that helpful.
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With this change, the spi driver of the stm32 soc, is prepared to enter/exit the low power mode.
The SPI executes the
spi_stm32_set_power_statefrom thespi_stm32_pm_controlto have a clean configuration before entering/exiting the low power mode.This is the case with stm32wb55 and stm32l47 as first targets devices, which are using the lptimer.
On wakeup, the clocks are re-configured thanks to the stm32_clock_control_init function called directly in the
pm_power_state_exit_post_ops of each soc.
This method is similar to what was done on the UART.
A new sample application is added to demonstrate the operations on the SPI driver.
Signed-off-by: Francois Ramu [email protected]