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add usarts to 303

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This commit is contained in:
Edward Emelianov
2021-07-15 22:21:37 +03:00
parent 5715444e1e
commit 813549e0f2
18 changed files with 983 additions and 2 deletions
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2
F303-nolib/inc/Fx/stm32f3.h
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@@ -109,7 +109,7 @@ TRUE_INLINE int StartHSE(){ // system bus 72MHz from PLL
#define WAITWHILE(x) do{StartUpCounter = 0; while((x) && (++StartUpCounter < 0xffffff)){nop();}; if(x) return 0;}while(0)
RCC->CR = (RCC->CR & ~RCC_CR_PLLON) | RCC_CR_HSEON; // disable PLL to reconfigure, enable HSE
WAITWHILE(!(RCC->CR & RCC_CR_HSERDY));
// Enable Prefetch Buffer. Flash 2 wait states for 48..72MHz
// Enable Prefetch Buffer. Flash 4 wait states for 48..72MHz
FLASH->ACR = (FLASH->ACR & ~(FLASH_ACR_LATENCY)) |
FLASH_ACR_LATENCY_2 | FLASH_ACR_PRFTBE;
// HCLK = SYSCLK (AHB prescaler = 1), PCLK1 = HCLK (APB1 prescaler = 1), PCLK2 = HCLK (APB2 prescaler = 1)