dts/arm/st: wl: increase Sub-GHz SPI frequency to 12MHz #38793
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Oh neat good idea! Would be nice to make sure we are still in spec, could not find any either, maybe @ABOSTM knows something? The cube package seems to be setting |
Good catch, I'll make it 12 MHz then. |
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According to reference manual:
So both 12MHz and 16MHz are possible.
Note: increasing SUBGHZSPI_SCK to 16MHZ will need to reduce PCLK3 to 32 MHZ instead of 48MHZ. And implicitly the same for SYSCLKC , HCLK1 and HCLK2. So I am not sure it is globally better.
12MHz sounds good to me
The maximum supported speed according to the SX126x datasheet (I have not found that information in the STM32WL datasheet or reference manual). Increase the Sub-GHz SPI frequency from 1 Mhz to to 12 MHz, which corresponds to a baud rate prescaler of 4 with a 48 MHz clock. It also matches what is done the the STM32CubeWL package. This reduces the time the MCU is kept running, thus reducing the global power consumption. Signed-off-by: Aurelien Jarno <[email protected]>
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The maximum supported speed according to the SX126x datasheet (I have
not found that information in the STM32WL datasheet or reference
manual). Increase the Sub-GHz SPI frequency from 1 Mhz to to 12 MHz,
which corresponds to a baud rate prescaler of 4 with a 48 MHz clock. It
also matches what is done the the STM32CubeWL package.
This reduces the time the MCU is kept running, thus reducing the global
power consumption.
Signed-off-by: Aurelien Jarno [email protected]