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trezorhal: add spread spectrum clock

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This commit is contained in:
Jan Pochyla 2017-10-31 11:49:18 +01:00
parent ce3dc61e63
commit c632f9450f
1 changed files with 2 additions and 0 deletions
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embed/trezorhal/stm32.c
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@ -22,6 +22,8 @@ void SystemInit(void)
| (0U << RCC_PLLCFGR_PLLP_Pos) // P = 2 (two bits, 00 means PLLP = 2) | (0U << RCC_PLLCFGR_PLLP_Pos) // P = 2 (two bits, 00 means PLLP = 2)
| (168U << RCC_PLLCFGR_PLLN_Pos) // N = 168 | (168U << RCC_PLLCFGR_PLLN_Pos) // N = 168
| (4U << RCC_PLLCFGR_PLLM_Pos); // M = 4 | (4U << RCC_PLLCFGR_PLLM_Pos); // M = 4
// enable spread spectrum clock for main PLL
RCC->SSCGR = RCC_SSCGR_SSCGEN | (44 << RCC_SSCGR_INCSTEP_Pos) | (250 << RCC_SSCGR_MODPER_Pos);
// enable clock security system, HSE clock, and main PLL // enable clock security system, HSE clock, and main PLL
RCC->CR |= RCC_CR_CSSON | RCC_CR_HSEON | RCC_CR_PLLON; RCC->CR |= RCC_CR_CSSON | RCC_CR_HSEON | RCC_CR_PLLON;
// wait until PLL and HSE ready // wait until PLL and HSE ready