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stm32f0: rcc: Enable prefetch buffer in rcc_clock_setup_*()

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Prefetch buffer makes the code execution from the Flash memory faster.

Signed-off-by: Adam Heinrich <adam@adamh.cz>
This commit is contained in:
Adam Heinrich 2017-09-30 13:48:09 +02:00 committed by Karl Palsson
parent 8f892a8e81
commit e9a8c5106e
1 changed files with 3 additions and 0 deletions
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3
lib/stm32/f0/rcc.c
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@ -543,6 +543,7 @@ void rcc_clock_setup_in_hse_8mhz_out_48mhz(void)
rcc_set_hpre(RCC_CFGR_HPRE_NODIV);
rcc_set_ppre(RCC_CFGR_PPRE_NODIV);
flash_prefetch_buffer_enable();
flash_set_ws(FLASH_ACR_LATENCY_024_048MHZ);
/* PLL: 8MHz * 6 = 48MHz */
@ -570,6 +571,7 @@ void rcc_clock_setup_in_hsi_out_48mhz(void)
rcc_set_hpre(RCC_CFGR_HPRE_NODIV);
rcc_set_ppre(RCC_CFGR_PPRE_NODIV);
flash_prefetch_buffer_enable();
flash_set_ws(FLASH_ACR_LATENCY_024_048MHZ);
/* 8MHz * 12 / 2 = 48MHz */
@ -595,6 +597,7 @@ void rcc_clock_setup_in_hsi48_out_48mhz(void)
rcc_set_hpre(RCC_CFGR_HPRE_NODIV);
rcc_set_ppre(RCC_CFGR_PPRE_NODIV);
flash_prefetch_buffer_enable();
flash_set_ws(FLASH_ACR_LATENCY_024_048MHZ);
rcc_set_sysclk_source(RCC_HSI48);