本帖最后由 Dylan疾风闪电 于 2018-8-9 15:39 编辑
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使用举例:配置72MHZ时钟作为系统时钟#define SystemClockMHz 72//MHZ
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HW_SystemClockMux(USE_EXTERNAL_HSE, SystemClockMHz) ;
3 ?$ G1 y* a- u7 s; DHW_SystemClockMux(USE_INTERNAL_HSI, SystemClockMHz);
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2 w G! M( ?% \代码已验证。发个帖子,便于自己移植使用。+ d" P! N' k* j6 e7 p% W1 S4 \
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$ [# Z+ a E, L4 E" W; P. L- /* Const to source of high speed clock:internal or external. */
& N* b5 r, _: b8 ? - #define USE_EXTERNAL_HSE 0
! K( U( L& F4 O% F8 ?; l: N - #define USE_INTERNAL_HSI 1
2 ~8 [- `# P- S: x* _ d$ Z6 } - /**
Q5 ?1 [( |0 x! w# M& E% g: ^: a - * <b>配製系統主時鐘頻率。</b>. ]# j$ }' x; P2 K1 Y+ \
- * <p>功能:選擇時鐘源,并進行PLL倍頻。
7 L9 s5 F5 K: Q% z - * @param osc 高速時鐘源的選擇。
' a' @! R8 G" j - * @arg USE_EXTERNAL_HSE: 外部高速晶振
$ I9 o: k8 u& g& o - * @arg USE_INTERNAL_HSI: 內部高速晶振
8 B8 J# M3 Q8 C7 H, V4 S - * @param maxFreq 芯片最大主频?M,查询对应的数据手册1 `. q6 @1 {# u, k# T7 B2 _
- * @return osc
* c( G; k) I' `, \ - * @version 2.0.0.0(20160407)
! f: f5 t7 k; L8 l; }+ g ] - * <p-2014>实现CM0与CM3兼容完成!) W% s4 Y' [. J( x" E- Q3 e; u& m
- * <p-2016>對字符串/單詞進行變更。5 i# L4 m( a3 q
- * @author Dylan
/ Y) D ^# W# H/ ^, V, ? - */
2 o! W8 f4 y& k% c8 Y - uint8_t HW_SystemClockMux(uint8_t osc, uint8_t maxFreq)2 o% x8 X8 J$ u' H; b
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- #if defined (STM32F100) || defined (STM32F101) || defined (STM32F103)
& N% I+ h2 h+ }( b& i - uint8_t errCode = 0xff;
, \; @7 L- {, O - uint32_t sTimeCount, sTimeMax = 0xFFF;* Q. C+ e6 m' [9 b* {4 _
- #endif
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- HW_SystemPowerON();
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- switch(osc)3 u+ r* e: I. Z( s. ~
- {
+ m6 E$ D2 O3 v* s; v2 t3 Z7 H - case USE_EXTERNAL_HSE:0 t& s8 k' I& b* Q+ v% N1 u! Y
- #if defined (STM32F100) || defined (STM32F101) || defined (STM32F103)
. o/ G5 ]4 D; t6 A - RCC->CR |= 1<<16; //HSEON
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- sTimeCount = sTimeMax;$ s! T: x1 X) A( ^
- while(((RCC->CR>>17) & 0x1) == 0) //等待HSE就绪
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- if (sTimeCount--) return errCode;
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- RCC->CFGR |= (maxFreq/8-2)<<18; //设置PLL值倍频//HSE 8MHz8 A# t% n4 x! i5 K: M
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- RCC->CFGR |= 1<<16; //切换PLL输入时钟源为0->1:HSI/2(4MHz)->HSE(8MHz)
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1 B! {" ?+ l( J# _ - //存在等待状态时,必须先开启预取缓冲区4 X- P) }( N( ]8 g
- if (maxFreq <= 24)0 u; t2 G. K9 I8 `. E
- FLASH->ACR |= 0x30;//000:零等待状态,当 0 < SYSCLK ≤ 24MHz- _, e& _0 S) }
- else if (maxFreq <= 48)& J* `5 r0 E# M1 X# q- n" y
- FLASH->ACR |= 0x31;//001:一个等待状态,当 24MHz < SYSCLK ≤ 48MHz& ^6 _+ @; Z4 @+ @& d y6 e7 R0 ^
- else
" z% }% T: Q* }/ X$ J - FLASH->ACR |= 0x32;//010:两个等待状态,当 48MHz < SYSCLK ≤ 72MHz5 v% W# J: p& V y L1 [) y
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- RCC->CR |= 1<<24; //PLLON
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. o2 Y( g$ `5 J% A - sTimeCount = sTimeMax;1 Y8 Z: G; ?( M/ g5 K
- while(((RCC->CR>>25) & 0x1) == 0) //等待PLL就绪) T c, i; t7 Y5 c3 Y7 T
- {
& N8 Q% `& S/ W5 C" ?* R8 W9 t1 {) y - if (sTimeCount--) return errCode;
2 q' X. u! Z2 d! J - }
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! H; ]7 X: o7 H+ q g" p& @ - RCC->CFGR |= 0x2; //PLL作为sysClk
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4 O0 @0 O# s% h4 T - sTimeCount = sTimeMax;0 T2 B) H, O( e! H+ Q' J0 W. r* v/ L
- while(((RCC->CFGR>>2) & 0x3) != 0x02) //等待sysClk就绪: R7 z- w/ V% i" N2 R6 t
- {
) S4 i/ B9 h O+ B - if (sTimeCount--) return errCode;7 `' f9 h* V$ [: _/ ~! A
- }
: i$ C( I! U; T- t - #elif defined (STM32F051) || defined (STM32F042) //none
/ Z9 E' j; }1 y5 w0 Y: C: s' g - #else% W p7 Z. o2 s1 D4 r
- #warning "Make sure needn't define STM32Fxxx etc. ?"
# ^7 j0 u m# f4 c* P N# N - #endif% C( O, e) L8 u x3 {. R
- break;
2 F3 T0 x M- \6 [0 c - default: //case USE_INTERNAL_HSI:
5 P+ n4 u* h4 h - RCC->CFGR &= 0xFFFEFFFF; //HSI 8MHz/2
6 i) X6 o0 Q8 S' J( r" ]6 N' X! J - RCC->CFGR |= ((maxFreq>>2)-2)<<18; //设置PLL值倍频1 E3 P% X9 B: k/ {6 ^
-
: O! |$ X2 g- g9 ~+ d5 m - //存在等待状态时,必须先开启预取缓冲区, e. `! W( q; e' s
- if (maxFreq <= 24)
' J5 k5 N U0 W, _, S# ]5 n - FLASH->ACR |= 0x30;//000:零等待状态,当 0 < SYSCLK ≤ 24MHz
3 H* {6 I8 k1 {% [+ v; g8 r - else if (maxFreq <= 48)* ]& j: ]8 T% T" ]7 V- b4 D, S) L
- FLASH->ACR |= 0x31;//001:一个等待状态,当 24MHz < SYSCLK ≤ 48MHz
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- FLASH->ACR |= 0x32;//010:两个等待状态,当 48MHz < SYSCLK ≤ 72MHz; T6 C" H+ e6 Q9 v1 j
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- RCC->CR |= 1<<24; //PLLON
1 ~" b S- G: M5 T* e+ z% I - while(((RCC->CR>>25) & 0x1) != 1); //等待PLL就绪7 `0 \5 _# W0 K* @! O8 j# x
- RCC->CFGR |= 0x2; //PLL作为sysClk
: o- z; T" b6 S# b - while(((RCC->CFGR>>2)&0x3) != 0x02); //等待sysClk就绪
: Z. f3 j* L' n' `; G: { - break;
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-
- m' N- @) j# G. Z - return 0;
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- /**9 H/ {9 Y+ R. C% @2 {" \3 |
- * <b>芯片上电默认时钟配置。</b>0 P6 J3 Q8 n) q5 C: n1 V
- * <p>功能:用来恢复时钟系统到上电默认状态。# S8 c) B* x1 `, W' H# s% A
- * @version 1.1.0.0(20140228)
7 p4 P/ }( {. t - * <p-2014>实现CM0与CM3兼容完成!' s: C$ F7 F1 C ^7 I3 q
- * @author Dylan
" }+ ^ n/ W _, q1 m - */
- v# O- h0 H+ N$ G; l, |; K - void HW_SystemPowerON(void)
* V& P" _% Y3 D) t& L - {
8 A3 {+ ~2 Z' d) N - #if defined (STM32F051) || defined (STM32F042)
% r. P* k/ r7 V5 g0 }, v" _4 y - RCC->CR |= 0x00000001;//HSION% Z9 o* ~0 m: f9 x9 Q I
5 b. V; q2 i7 f: c4 S/ f- RCC->CR &= 0x0202FFFF;/* Reset HSEON, CSSON and PLLON, HSEBYP bit */
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- RCC->CFGR &= 0x0000000C;/* Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE and MCOSEL[2:0],PLLSRC, PLLXTPRE and PLLMUL[3:0] bits */
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- RCC->CFGR2 &= 0x00000000;/* Reset PREDIV1[3:0] bits *///与CFGR[17]一起用作HSE-PLL设置! ^) N; }1 P/ S, A; r; t
. v; ~( S" W. A1 ~) J" X- RCC->CFGR3 &= 0x00000000;/* Reset USARTSW[1:0], I2CSW, CECSW and ADCSW bits */% v; Z9 u0 M0 n2 K8 t9 D7 O3 g
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- RCC->CR2 &= 0xFFFFFFFE;/* Reset HSI14 bit */
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0 v/ D; W2 \; T! ~9 H* {; W- RCC->CIR = 0x00000000;/* Disable all interrupts */
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2 {& @1 f3 E. I- #elif defined (STM32F100) || defined (STM32F101) || defined (STM32F103)
6 y0 [; w# C9 i' [5 S - RCC->CR &= 0x0000FF83;//把HSI调整到8MHz±1%==》开启HSI==》等待就绪
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0 i# r+ h+ |% S3 E* V/ u& M9 D) `- RCC->CFGR = 0x00000400;//限制APB1时钟是HCLK_Div28 {! P, a0 ?$ |8 @3 I& h
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- RCC->CIR = 0x00BF0000;//清除所有的RCC中断标志3 \6 ~% d' k4 U$ }; n
- 7 \; [ `1 x/ r6 P0 A: ?
- //配置向量表
( Y7 r9 P- R& l+ D j - #ifdef VECT_TAB_RAM" L& M# \+ G f& N2 [. [( R* p
- /* Set the Vector Table base location at 0x20000000 */
: A& T$ Z( ]+ U, A9 X( f - NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
; g; I7 j! N1 S3 r - #else /* VECT_TAB_FLASH */6 z& }" v3 e! b3 S& k, l0 ]
- /* Set the Vector Table base location at 0x08000000 */' ~! n( J5 g8 ~' N, e
- NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);* F0 V" I+ q, ?8 {9 B
- #endif) A* J ~* h! \3 u
- #else
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# n; ^, u7 B8 S" }" ` - #endif1 h6 c! u9 g; f4 ]6 D6 \4 G
- }
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