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| author | Kevin O'Connor <kevin@koconnor.net> | 2019-08-12 09:37:21 -0400 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2019-08-14 19:33:11 -0400 |
| commit | 841150ff007556e13664716d5ad0cdf7507d0482 (patch) | |
| tree | 5091f8d877afe8d3a109c045dfa84395572b434e /src/stm32/stm32f4.c | |
| parent | effe6f6ddd5132db4ab4f88bf8616aab575e7691 (diff) | |
| download | kutter-841150ff007556e13664716d5ad0cdf7507d0482.tar.gz kutter-841150ff007556e13664716d5ad0cdf7507d0482.tar.xz kutter-841150ff007556e13664716d5ad0cdf7507d0482.zip | |
stm32: Enable 48Mhz USB clock on stm32f446
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Diffstat (limited to 'src/stm32/stm32f4.c')
| -rw-r--r-- | src/stm32/stm32f4.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/stm32/stm32f4.c b/src/stm32/stm32f4.c index d0a2f249..dab8d524 100644 --- a/src/stm32/stm32f4.c +++ b/src/stm32/stm32f4.c @@ -131,6 +131,28 @@ enable_clock_stm32f446(void) PWR->CR = (3 << PWR_CR_VOS_Pos) | PWR_CR_ODEN | PWR_CR_ODSWEN; while (!(PWR->CSR & PWR_CSR_ODSWRDY)) ; + + // Enable 48Mhz USB clock + if (CONFIG_USBSERIAL) { + if (CONFIG_CLOCK_REF_8M) { + RCC->PLLSAICFGR = ( + (4 << RCC_PLLSAICFGR_PLLSAIM_Pos) + | (96 << RCC_PLLSAICFGR_PLLSAIN_Pos) + | (1 << RCC_PLLSAICFGR_PLLSAIP_Pos) + | (4 << RCC_PLLSAICFGR_PLLSAIQ_Pos)); + } else { + RCC->PLLSAICFGR = ( + (8 << RCC_PLLSAICFGR_PLLSAIM_Pos) + | (96 << RCC_PLLSAICFGR_PLLSAIN_Pos) + | (1 << RCC_PLLSAICFGR_PLLSAIP_Pos) + | (4 << RCC_PLLSAICFGR_PLLSAIQ_Pos)); + } + RCC->CR |= RCC_CR_PLLSAION; + while (!(RCC->CR & RCC_CR_PLLSAIRDY)) + ; + + RCC->DCKCFGR2 = RCC_DCKCFGR2_CK48MSEL; + } #endif } |