31 lines
886 B
C++
31 lines
886 B
C++
#include "CH32V20xxx.h"
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extern "C" void SystemInit ();
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enum CLKSRC : uint32_t {
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CLK_HSI = 0u,
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CLK_HSE,
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CLK_PLL,
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};
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// HSE i HSI mají frekvenci 8 MHz
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void SystemInit(void) {
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/// TODO
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EXTEND.EXTEND_CTR.B.PLL_HSI_PRE = SET; // HSI used for PLL, not divided
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RCC.CFGR0.modify([](RCC_Type::CFGR0_DEF & r) -> uint32_t {
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r.B.PLLMUL = 0xFu; // 8x18 = 144
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r.B.PPRE1 = 4u; // 100: HCLK divided by 2 (PB1)
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return r.R; // HB, PB2 not divided
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});
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RCC.CTLR.modify([](RCC_Type::CTLR_DEF & r) -> uint32_t {
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r.B.HSITRIM = 0x10u;
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r.B.HSION = SET;
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//r.B.HSEBYP = SET;
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r.B.CSSON = SET; // Enable clock security system
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r.B.PLLON = SET;
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return r.R;
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});
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RCC.INTR.R = 0x009F0000u; // clear interrupts
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while (RCC.CTLR.B.PLLRDY == RESET);
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// USE PLL
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RCC.CFGR0.B.SW = CLK_PLL ;
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while (RCC.CFGR0.B.SWS != CLK_PLL);
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}
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