diff options
Diffstat (limited to 'src/stm32/stm32f4.c')
| -rw-r--r-- | src/stm32/stm32f4.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/stm32/stm32f4.c b/src/stm32/stm32f4.c index a2060d76..fd3eb0ba 100644 --- a/src/stm32/stm32f4.c +++ b/src/stm32/stm32f4.c @@ -138,8 +138,8 @@ enable_clock_stm32f446(void) while (!(PWR->CSR & PWR_CSR_ODSWRDY)) ; - // Enable 48Mhz USB clock - if (CONFIG_USB) { + // Enable 48Mhz USB clock for USB or for SDIO + if (CONFIG_USB || CONFIG_HAVE_GPIO_SDIO) { uint32_t ref = (CONFIG_STM32_CLOCK_REF_INTERNAL ? 16000000 : CONFIG_CLOCK_REF_FREQ); uint32_t plls_base = 2000000, plls_freq = FREQ_USB * 4; @@ -153,6 +153,14 @@ enable_clock_stm32f446(void) ; RCC->DCKCFGR2 = RCC_DCKCFGR2_CK48MSEL; + } else { + // Reset value just in case the booloader modified the default value + RCC->DCKCFGR2 = 0; + } + + // Set SDIO clk to PLL48CLK + if (CONFIG_HAVE_GPIO_SDIO) { + MODIFY_REG(RCC->DCKCFGR2, RCC_DCKCFGR2_SDIOSEL, 0); } #endif } |