djsundog
/
circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

stm32/powerctrlboot: Increase SYSCLK to 32MHz for L0 MCUs.

This commit is contained in:
Damien George 2019-07-16 14:46:31 +10:00
parent 4c1ad1f691
commit 4096fa397b
1 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
ports/stm32/powerctrlboot.c
View File

@ -82,11 +82,21 @@ void SystemClock_Config(void) {
// Enable power control peripheral
__HAL_RCC_PWR_CLK_ENABLE();
// Use the 16MHz internal oscillator
// Set flash latency to 1 because SYSCLK > 16MHz
FLASH->ACR |= FLASH_ACR_LATENCY;
// Enable the 16MHz internal oscillator
RCC->CR |= RCC_CR_HSION;
while (!(RCC->CR & RCC_CR_HSIRDY)) {
}
const uint32_t sysclk_src = 1;
// Use HSI16 and the PLL to get a 32MHz SYSCLK
RCC->CFGR = 1 << RCC_CFGR_PLLDIV_Pos | 1 << RCC_CFGR_PLLMUL_Pos;
RCC->CR |= RCC_CR_PLLON;
while (!(RCC->CR & RCC_CR_PLLRDY)) {
// Wait for PLL to lock
}
const uint32_t sysclk_src = 3;
// Select SYSCLK source
RCC->CFGR |= sysclk_src << RCC_CFGR_SW_Pos;