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bsp.stm32f407g_disc1: Initialize USB clock and pins.

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This commit is contained in:
William D. Jones 2019-01-11 10:20:14 -05:00
parent 75fda7d638
commit e73e016a8c
1 changed files with 14 additions and 1 deletions
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15
hw/bsp/stm32f407g_disc1/board_stm32f407g_disc1.c
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@ -58,11 +58,24 @@ void board_init(void)
// Init the LED on PD14
RCC->AHB1ENR |= RCC_AHB1ENR_GPIODEN;
GPIOD->MODER = GPIO_MODER_MODE14_0;
GPIOD->MODER |= GPIO_MODER_MODE14_0;
// USB Clock init
// PLL input- 16 MHz (HSI clock)
// VCO input- 1 to 2 MHz (2 MHz, M = 8)
// VCO output- 100 to 432 MHz (144 MHz, N = 72)
// Main PLL out- <= 180 MHz (18 MHz, P = 8, not used; HSI used as system clk.)
// USB PLL out- 48 MHz (Q = 3)
RCC->PLLCFGR = (3 << RCC_PLLCFGR_PLLQ_Pos) | (8 << RCC_PLLCFGR_PLLP_Pos) \
| (72 << RCC_PLLCFGR_PLLN_Pos) | (8 << RCC_PLLCFGR_PLLM_Pos);
RCC->CR |= RCC_CR_PLLON;
RCC->AHB2ENR |= RCC_AHB2ENR_OTGFSEN;
// USB Pin Init
// PA10- ID, PA11- DM, PA12- DP
// PC0- Power on
GPIOD->MODER |= GPIO_MODER_MODE10_1 | GPIO_MODER_MODE11_1 | GPIO_MODER_MODE12_1;
GPIOA->AFR[1] |= (10 << GPIO_AFRH_AFSEL10_Pos) | (10 << GPIO_AFRH_AFSEL11_Pos) | (10 << GPIO_AFRH_AFSEL12_Pos);
}