本帖最后由 Dylan疾风闪电 于 2018-8-9 15:39 编辑
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/ g5 g7 V+ s' k, p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) ;7 L0 X L1 n0 z, K Q) p
HW_SystemClockMux(USE_INTERNAL_HSI, SystemClockMHz);
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代码已验证。发个帖子,便于自己移植使用。: X: U# V! P+ }' M, {# j* f
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- /* Const to source of high speed clock:internal or external. */
* m) F; a1 G* b! J9 k - #define USE_EXTERNAL_HSE 0
& W( W L/ Q5 L; S N. y5 F4 ^" D! o( F - #define USE_INTERNAL_HSI 1; m) s1 d/ z& @( ^
- /**
9 P0 R' c6 ]+ _) r1 V - * <b>配製系統主時鐘頻率。</b>) _. X8 W4 }$ n( q% ~& ?" W
- * <p>功能:選擇時鐘源,并進行PLL倍頻。0 R5 O+ E' f `: @2 t0 Y% c
- * @param osc 高速時鐘源的選擇。, x: `! E, q2 `/ {( ]; P1 v0 y# i
- * @arg USE_EXTERNAL_HSE: 外部高速晶振
; l! _' H, A4 {9 v1 ~! {" Y% ~) N - * @arg USE_INTERNAL_HSI: 內部高速晶振
3 w2 ?! s+ P' S5 r( p0 b - * @param maxFreq 芯片最大主频?M,查询对应的数据手册4 i" H( P# O% d7 G2 x9 M
- * @return osc
2 c+ D2 @$ E$ L, l' @* I& f. c. I - * @version 2.0.0.0(20160407)
6 o5 a; q" S2 ]2 t4 `/ s: k/ q - * <p-2014>实现CM0与CM3兼容完成!
+ H- f2 y2 g# p5 k' m" p) ~ - * <p-2016>對字符串/單詞進行變更。
& W( N7 ]. a Y. Z% { - * @author Dylan8 V( Y2 J3 g6 H# c3 @3 H
- */" @1 J% u E) f2 ~4 ~; l" R: }
- uint8_t HW_SystemClockMux(uint8_t osc, uint8_t maxFreq)
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- #if defined (STM32F100) || defined (STM32F101) || defined (STM32F103)
8 G! A* y4 o) [) J" G8 ^ - uint8_t errCode = 0xff;
- |8 P, U; f& y) _* N6 u7 ~; @4 `1 d - uint32_t sTimeCount, sTimeMax = 0xFFF;: a! n/ H2 g6 {/ b; e) s# E7 Z
- #endif, [9 a* F% V* w7 A2 v# y4 I
- # B8 S+ n. s6 G9 }
- HW_SystemPowerON();
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, n3 p( N, r7 \9 X- W$ c& b$ N - switch(osc)8 F \2 L6 C9 h3 ~. V
- {9 p# ~5 J: n+ b2 }; i' z x
- case USE_EXTERNAL_HSE:: S) O- m1 c4 D5 t& c z
- #if defined (STM32F100) || defined (STM32F101) || defined (STM32F103): F: ~! I& i; H) S' x( ]2 g8 _
- RCC->CR |= 1<<16; //HSEON
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- sTimeCount = sTimeMax;3 r6 f9 s; N0 q$ w
- while(((RCC->CR>>17) & 0x1) == 0) //等待HSE就绪. n: x% B$ W) x
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- if (sTimeCount--) return errCode;/ R) c7 e9 C# a' F8 s2 ? ]
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-
) H* G$ V$ D# C7 u - RCC->CFGR |= (maxFreq/8-2)<<18; //设置PLL值倍频//HSE 8MHz. D. u- ^( v" Y
-
, w( p/ N; [3 M; Y0 p+ H - RCC->CFGR |= 1<<16; //切换PLL输入时钟源为0->1:HSI/2(4MHz)->HSE(8MHz)
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- //存在等待状态时,必须先开启预取缓冲区- u0 Q: O- |5 I) s+ W( `, {
- if (maxFreq <= 24)
) X4 f b* x" ]9 H' _& e: V7 w - FLASH->ACR |= 0x30;//000:零等待状态,当 0 < SYSCLK ≤ 24MHz
/ S# w7 H! T+ g% ?. k - else if (maxFreq <= 48)
5 }/ E6 \) X# z - FLASH->ACR |= 0x31;//001:一个等待状态,当 24MHz < SYSCLK ≤ 48MHz; u7 E$ Y/ h6 X: l. }! S
- else5 l) \8 f" u4 l$ d
- FLASH->ACR |= 0x32;//010:两个等待状态,当 48MHz < SYSCLK ≤ 72MHz
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' t$ d5 n& J# z* T( t# D- k K - RCC->CR |= 1<<24; //PLLON
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C& r6 I; T: ~ - sTimeCount = sTimeMax;! U# ^8 H6 G! L( d+ B! \: N( H& E7 [
- while(((RCC->CR>>25) & 0x1) == 0) //等待PLL就绪
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4 _$ p) q% F7 n e; J, D% b - if (sTimeCount--) return errCode;
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- RCC->CFGR |= 0x2; //PLL作为sysClk
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& y; r; M& I/ ]( Y: D3 J8 K - sTimeCount = sTimeMax;
* ^4 J4 W' g4 b - while(((RCC->CFGR>>2) & 0x3) != 0x02) //等待sysClk就绪
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- if (sTimeCount--) return errCode;
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- #elif defined (STM32F051) || defined (STM32F042) //none* r! H' B" a( M/ i" q
- #else& |3 q6 Q( s! Y" a3 y
- #warning "Make sure needn't define STM32Fxxx etc. ?") m& v) I Q7 }' w* g
- #endif
$ z0 E/ T' Q: V6 K - break;
" B. L$ U- J0 w! ]5 \8 x; p - default: //case USE_INTERNAL_HSI:
|3 |$ x$ Y' M* q2 I8 X- ]9 X - RCC->CFGR &= 0xFFFEFFFF; //HSI 8MHz/29 o' p- ?4 N+ Z1 O! x: G
- RCC->CFGR |= ((maxFreq>>2)-2)<<18; //设置PLL值倍频
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# P/ A. c3 U7 B. u - //存在等待状态时,必须先开启预取缓冲区
; f. p' C U' o/ M- g0 Y# j7 X - if (maxFreq <= 24)8 Q# Q' o' F8 m
- FLASH->ACR |= 0x30;//000:零等待状态,当 0 < SYSCLK ≤ 24MHz0 m8 l) F+ T3 N8 z9 i
- else if (maxFreq <= 48)
# y3 \; n' ?# \. T - FLASH->ACR |= 0x31;//001:一个等待状态,当 24MHz < SYSCLK ≤ 48MHz
, [/ n' w4 p; v1 C+ u - else
0 g" z7 t) o. J+ K! e x - FLASH->ACR |= 0x32;//010:两个等待状态,当 48MHz < SYSCLK ≤ 72MHz. e1 b! M" ^3 z$ v
-
+ w) R$ P7 Y( }% \, |' ^! s - RCC->CR |= 1<<24; //PLLON
. ?0 u: q' k" E0 J" n - while(((RCC->CR>>25) & 0x1) != 1); //等待PLL就绪
$ V _6 u/ T0 B/ K5 |& k; P - RCC->CFGR |= 0x2; //PLL作为sysClk
7 A# z z) c6 {( o: D w% A - while(((RCC->CFGR>>2)&0x3) != 0x02); //等待sysClk就绪
2 [6 a3 F3 X3 O! I/ J* ^ - break;; C5 A2 C: A7 A/ I/ r6 u
- }
x/ A- T+ Y4 |3 U j/ k -
& s. O6 v' ~% _: j" S - return 0;
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- /**+ x' M, u, X5 [5 ^2 V
- * <b>芯片上电默认时钟配置。</b>$ K+ N4 ]7 q7 \
- * <p>功能:用来恢复时钟系统到上电默认状态。3 R* \$ j6 |+ h5 k. g
- * @version 1.1.0.0(20140228)8 `: l9 Q- X3 }+ ]
- * <p-2014>实现CM0与CM3兼容完成!( h6 u7 p( a. E. \
- * @author Dylan; l. }6 ?' a- S, S* |4 V8 F8 j
- */" U3 I3 @+ H7 d6 J
- void HW_SystemPowerON(void)
4 |0 | Q4 D+ I; Z) j' b - {
" t' y, [! U5 u8 G7 m6 n R' I+ B8 n - #if defined (STM32F051) || defined (STM32F042)
% {( O O/ m% d) ~+ i' ^ w9 ?# y6 N - RCC->CR |= 0x00000001;//HSION
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, N( j5 E) `. T2 L1 a! @7 A- RCC->CR &= 0x0202FFFF;/* Reset HSEON, CSSON and PLLON, HSEBYP bit */
m2 l$ z7 J$ ~8 P! W - - [$ M& V; w0 M; y# _+ M, [/ Y8 ]# X
- 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 */) u: I4 L; ^3 Y! Z
7 r$ `1 Z* u9 p! k9 G. s) r- RCC->CFGR2 &= 0x00000000;/* Reset PREDIV1[3:0] bits *///与CFGR[17]一起用作HSE-PLL设置
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5 }) ~* u, y: B7 P/ h3 N# \- RCC->CFGR3 &= 0x00000000;/* Reset USARTSW[1:0], I2CSW, CECSW and ADCSW bits */
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- RCC->CR2 &= 0xFFFFFFFE;/* Reset HSI14 bit */7 w1 @) K# U9 W5 h7 B% |/ N
5 y% j* T3 H8 j' U1 }& W5 B% i- RCC->CIR = 0x00000000;/* Disable all interrupts */
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- #elif defined (STM32F100) || defined (STM32F101) || defined (STM32F103)
3 c5 E! s* i7 L9 e# O+ D) q - RCC->CR &= 0x0000FF83;//把HSI调整到8MHz±1%==》开启HSI==》等待就绪; [# D0 G% ], ?* M
- $ H$ Z- n+ R" K- O, {* b: n$ C
- RCC->CFGR = 0x00000400;//限制APB1时钟是HCLK_Div20 b3 x7 F: V. e1 A3 b2 U
- : _3 W3 `8 W: Z* [: D
- RCC->CIR = 0x00BF0000;//清除所有的RCC中断标志4 Z# Z' u; C% w" ]3 k5 d/ S
8 s( F1 t# J' D5 T0 l6 B4 P" S- //配置向量表
9 W" W. ?+ H7 o/ i, \ - #ifdef VECT_TAB_RAM; g, }+ U) {0 P, d+ ?' N
- /* Set the Vector Table base location at 0x20000000 */
/ |2 i! x& |/ t. A$ m5 E0 d3 x - NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);2 z$ z W/ I9 g [& I" M8 v- T
- #else /* VECT_TAB_FLASH */6 l, V6 w* Y9 P/ `+ q# u% D
- /* Set the Vector Table base location at 0x08000000 */
( i( I* Z1 E2 t/ C1 A* k+ I - NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
6 V* x. i L4 Z - #endif
6 i! y5 i6 n! w6 R - #else
H8 _/ x. _- |# r4 H: L _& R - #warning "Make sure needn't define STM32F051 etc. ?"
. i4 b" J) ?5 o1 D+ c- k. T6 T - #endif/ S( F/ U/ R7 z4 K5 a& b
- }
复制代码
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