jepler/tinyuf2
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Merge pull request #292 from blues/swan_r5_LSE_drive

Browse source 
fix: Increases the drive strength of 32kHz external crystal
This commit is contained in:
Ha Thach 2023-03-01 12:02:37 +07:00 committed by GitHub
commit a7ea738052
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
ports/stm32l4/boards/swan_r5/board.c
View file

@ -28,8 +28,10 @@ void clock_init(void)
/* Enable Power Control clock */
__HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
__HAL_RCC_PWR_CLK_ENABLE();
// Sets the drive strength of 32kHz external crystal, in line with calculations specified in ST AN2867 sections 3.3, 3.4, and STM32L4 datasheet DS12023 Table 58. LSE oscillator characteristics.
// The drive strength RCC_LSEDRIVE_LOW is marginal for the 32kHz crystal oscillator stability, and RCC_LSEDRIVE_MEDIUMLOW meets the calculated drive strength with a small margin for parasitic capacitance.
__HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_MEDIUMLOW);
__HAL_RCC_PWR_CLK_ENABLE();
if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1_BOOST) != HAL_OK) {
Error_Handler();