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clear_otg_hs_memory: Delay after an RCC peripheral clock enabling

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mcudev 2017-10-12 16:06:15 -04:00 committed by Pavol Rusnak
parent 7103404b90
commit 73214017fa
1 changed files with 3 additions and 2 deletions
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5
embed/boardloader/lowlevel.c
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@ -11,11 +11,12 @@
void clear_otg_hs_memory(void)
{
RCC->AHB1ENR |= RCC_AHB1ENR_OTGHSEN; // enable USB_OTG_HS peripheral clock so that the peripheral memory is accessible
// use the HAL version due to section 2.1.6 of STM32F42xx Errata sheet
__HAL_RCC_USB_OTG_HS_CLK_ENABLE(); // enable USB_OTG_HS peripheral clock so that the peripheral memory is accessible
const uint32_t unpredictable = rng_get();
memset_reg((volatile void *) USB_OTG_HS_DATA_FIFO_RAM, (volatile void *) (USB_OTG_HS_DATA_FIFO_RAM + USB_OTG_HS_DATA_FIFO_SIZE), unpredictable);
memset_reg((volatile void *) USB_OTG_HS_DATA_FIFO_RAM, (volatile void *) (USB_OTG_HS_DATA_FIFO_RAM + USB_OTG_HS_DATA_FIFO_SIZE), 0);
RCC->AHB1ENR &= ~RCC_AHB1ENR_OTGHSEN; // disable USB OTG_HS peripheral clock as the peripheral is not needed right now
__HAL_RCC_USB_OTG_HS_CLK_DISABLE(); // disable USB OTG_HS peripheral clock as the peripheral is not needed right now
}
#define WANTED_WRP (OB_WRP_SECTOR_0 | OB_WRP_SECTOR_1 | OB_WRP_SECTOR_2)