外设设置规则:
2 G; F# b* ~* C1 U在配置之前必须添加外设的.c文件,以及相应包含的.h。.h文件在stm32f2xx_conf.h中添加。
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5 o P. ^1 Y$ F& h1、 时钟设置:包括引脚时钟和外设时钟:0 B9 b7 y0 ]" P0 X$ c N) F
* I: k5 `' X6 a# `RCC_XXXPeriphClockCmd();
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2、 引脚连接:即把引脚和外设功能进行连接;
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GPIO_PinAFConfig();* E' A5 I w$ z: z' Q7 _
3 V6 b# O8 r$ P' ?% k& L& d如下功能需要引脚与外设连接。* T9 T7 ^, l! B1 {& E
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* @arg GPIO_AF_RTC_50Hz
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* @arg GPIO_AF_MCO
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6 U8 A/ o. m2 [; @# x * @arg GPIO_AF_TAMPER* n: N5 G2 z$ P. ^# ]
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* @arg GPIO_AF_SWJ
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4 |# B0 z# e' k9 ] * @arg GPIO_AF_TRACE
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* @arg GPIO_AF_TIM1
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* @arg GPIO_AF_TIM2$ ?: ?$ R5 P4 f5 l+ d K3 r3 |5 H( ^
9 H( W/ c0 v! O- O a+ ^ * @arg GPIO_AF_TIM33 m( t1 d/ K. O. M
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* @arg GPIO_AF_TIM4- w n' i2 b* b* {; Z3 c
! @6 J" ]. L4 c7 V3 E * @arg GPIO_AF_TIM5% J7 ?# l) h* F1 r$ R9 d. {
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* @arg GPIO_AF_TIM8# E- ?6 X1 Q# [- Y$ s
) f& B3 `1 G& r- @ * @arg GPIO_AF_TIM9
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* @arg GPIO_AF_TIM10+ J# S1 l# l' ^# @
* B- W& U% u# n5 b( l" u3 c * @arg GPIO_AF_TIM11
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* @arg GPIO_AF_I2C1
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p/ w7 _; t9 l3 ]$ Z+ E5 y * @arg GPIO_AF_I2C2
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B7 [3 F. ^" Z; O4 q& v * @arg GPIO_AF_I2C3
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$ v$ p, q- e% t/ t$ z9 f) J * @arg GPIO_AF_SPI1
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* @arg GPIO_AF_SPI27 k" N1 \! z, p2 X+ E
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* @arg GPIO_AF_SPI3
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* @arg GPIO_AF_USART1" \3 y, Z6 c* }
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* @arg GPIO_AF_USART2: m* u+ b) G! E2 S$ Z
; n+ S' E% }# N. B( J5 o. n * @arg GPIO_AF_USART3
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# o( G- D" }# c1 i6 F * @arg GPIO_AF_UART4: x6 E6 q) ]& R; N V Y0 }; N
3 Z T3 E' q, B3 Y; d+ Z0 Z * @arg GPIO_AF_UART5* [7 W+ V; _: x6 L/ l" E! p
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* @arg GPIO_AF_USART6
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* @arg GPIO_AF_CAN1! _; @# a6 r; h# \8 A# q* p+ |. R
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* @arg GPIO_AF_CAN2; {4 V3 A) B, Y6 w% ?2 }7 g1 D1 ]
; K. }# m& w) S9 } * @arg GPIO_AF_TIM12; [& R: k, T$ n& a/ C" O# F
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* @arg GPIO_AF_TIM13. k( n" ^7 Y9 a9 B |
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* @arg GPIO_AF_TIM14+ ]9 t( {3 \. i( W8 h2 O% n
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* @arg GPIO_AF_OTG1_FS
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* @arg GPIO_AF_OTG2_HS/ a1 z; y* n' n* V' j
1 j1 G$ t- _) s- D * @arg GPIO_AF_ETH/ Y2 Q E2 e% S$ C
) v, X- E. A# w: s2 K * @arg GPIO_AF_FSMC
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& A6 }3 c; A: e * @arg GPIO_AF_OTG2_FS
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8 x+ m/ ^. x8 U * @arg GPIO_AF_SDIO0 C b* d( ]3 V* [9 |" W
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* @arg GPIO_AF_DCMI7 V1 e* V1 K) R7 H; M/ u; W7 C
0 W$ w$ C' @- H. \- e. [ * @arg GPIO_AF_EVENTOUT
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4 J: B$ e6 r9 b9 i7 q5 E& m* C3、 初始化GPIO配置:
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2 K t6 _4 x* r" P5 z% P7 mGPIO_Init();. c$ p$ ?" H: `3 ^! t
2 d W4 O# x: W8 m- b' Y4、 外设初始化:) L5 p0 M1 o& ~7 H V
2 ]1 L/ N& {5 k4 e9 u如UART初始化如下:
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; H% }) Y9 ]! h9 \# a: ^- USART_InitStructure.USART_BaudRate = 115200;% X1 J/ ]( X9 ~3 r+ [
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- USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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; w# ]2 P5 Y2 \& o- USART_InitStructure.USART_StopBits = USART_StopBits_1;/ l! a: ^+ u/ ]& }0 c
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- USART_InitStructure.USART_Parity = USART_Parity_No;
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- ~1 a' h! j% u- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;% l0 e0 o5 G+ R- U1 H
- E V4 E, n2 V! i- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;( S! Q) q4 h7 J1 v; `/ u r
) B( T8 Q0 c3 s# G0 |, ^- USART_Init(USARTx, &USART_InitStructure);
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ADC初始化如下:(多路模式)# k4 N9 D F& K; m. R0 y
% K5 \8 f6 s# }# D7 N- // DMA1_Stream0 channel0 configuration **************************************/
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- DMA_DeInit(DMA2_Stream0);
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8 T% t3 k7 H/ w0 o- DMA_InitStructure.DMA_Channel = DMA_Channel_0;
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5 j! q( Y# d* u/ [$ d- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS; //定义外设基址
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& {8 w5 @/ Y. U' @- DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADCConvertedValue; //定义寄存器基址
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- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //定义DMA传输模式从外设到内存+ J f9 r; \* K7 }1 m4 `; j
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- DMA_InitStructure.DMA_BufferSize = 4; //定义buffer大小,根据通道数来定
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- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变
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, \0 E4 R. ~; K4 S7 _3 ^0 \- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //DMA寄存器随之增加(单通道不增加)
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- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //DMA外设数据大小,16位半字9 F+ I$ q7 s9 a9 y6 n& g$ _) M
& X! q) k1 w- o4 S7 f- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //DMA存储器数据大小,16位半字 i6 `$ A, U" ]0 g# N
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- DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //模式为循环模式
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- DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA优先级高
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- DMA_InitStructure.DMA_DirectMode = DMA_DirectMode_Disable; //直接传输模式无效 DMA_InitStructure.DMA_FifoThreshold = DMA_FifoThreshold_HalfFull;/ s( _4 m4 H3 s {# }7 W, p0 B' j
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- DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
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. P! Z+ T3 j. |" r8 d" H* V" R$ j- DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;) |% o2 J2 M0 Q6 Q8 i
0 O, u" |6 e I: @7 P$ V3 [' z- DMA_Init(DMA2_Stream0, &DMA_InitStructure);
复制代码- //************ DMA2_Stream0 enable ************/% T* M% o1 z$ p& P, d/ [
3 ?2 A3 Q7 m* O1 ?, m- DMA_Cmd(DMA2_Stream0, ENABLE); //使能DMA流0
复制代码- //***************** ADCs DeInit ***************/
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8 i7 Z2 W) n! C- ADC_DeInit(); //ADC重初始化
复制代码- //************* ADC Common Init ****************/2 F& p3 [: i8 F7 Q) k% B) _
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- ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; //ADC独立模式
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- w* k+ l% A) c% \- ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2; //ADC采样周期2分频8 T+ X! w7 r. U8 z& x1 _3 ^
4 Z: ^2 |7 t# \! K6 M Q5 ^- ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
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- ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; //采样周期: q" T% m" M' C1 t
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- ADC_CommonInit(&ADC_CommonInitStructure); //基本初始化
复制代码- //*************** ADC1 Init ********************/
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" @+ y4 N( `$ m* \ F- A- ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //ADC采样精度, x2 \, X% U; [' R9 ^! \
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- ADC_InitStructure.ADC_ScanConvMode = ENABLE; //采用扫描模式,因为多路4 S( {( S$ s$ h/ }9 \
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- ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //连续扫描模式
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& n0 e. {0 p* j9 a5 j7 f- ADC_InitStructure.ADC_ExternalTrigConvPolarity = ADC_ExternalTrigConvPolarity_None;//无外部触发
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- ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //数据右对齐- B3 [) i @+ h
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- ADC_InitStructure.ADC_NbrOfChannel = 4; //采样通道数
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. u d4 V. {4 w1 }- ADC_Init(ADC1, &ADC_InitStructure);
复制代码- //************ ADC1 regular channel12 configuration ************/
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- ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 1, ADC_SampleTime_3Cycles);# d% F- a& @7 V! ~
4 x* @9 g- A, s' |- ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 2, ADC_SampleTime_3Cycles);% U$ k' q: e( t' \9 r& ]5 O" F2 r
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- ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 3, ADC_SampleTime_3Cycles);
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- ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 4, ADC_SampleTime_3Cycles);
复制代码- //********* Enable DMA request after last transfer (Multi-ADC mode) *********/) E- k/ z* K# m4 a ]/ ~& \# U/ f
7 `4 G; I( ~7 m2 d/ C. P1 }- ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
复制代码- //*********** Enable ADC1 DMA ****************/" W4 E: f' k! r( ~& ]9 J
6 Z5 v) [: I% q- ADC_DMACmd(ADC1, ENABLE);+ A+ g% J% u5 z4 X' q
复制代码- //*************** Enable ADC1 ***************/1 t R" N! ]4 W5 g+ C( K, `
3 D8 L9 x1 f) m2 A. z- ADC_Cmd(ADC1, ENABLE);
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- //******* Start ADC1 Software Conversion *****/9 h, \; }4 w6 Q j6 n( m9 z
1 g# w4 s5 ~% v8 t8 V; ^- ADC_SoftwareStartConv(ADC1); //软启动开始采样
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5、 中端配置:1 O- N" e: P+ t8 C
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以下为串口中断配置:
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- void NVIC_Configuration(void)- l' J( L. n$ C
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- {
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( }, X% H0 C: \2 D- NVIC_InitTypeDef NVIC_InitStructure;$ b( ~" K# P1 ^9 I, N
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- /* Configure the NVIC Preemption Priority Bits */
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- /* Configure one bit for preemption priority */
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8 F# D. `( A! \1 h- /* 优先级组说明了抢占优先级所用的位数,和子优先级所用的位数 在这里是1, 7 */
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) M0 f i3 K+ c( @: H- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); ; R, f, g4 }& p0 e
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- /* Enable the USART1 Interrupt */2 Z, @( M8 W ] b y1 Q0 P! ~' K2 c
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- NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn; //设置串口5中断7 K( ^/ V5 j* N: Z5 l t, U
7 k, e: z: {) F: F- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级 0) u) L( {- Z/ W. I1 ~
/ z+ L& l8 v6 }# }6 Q- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级为0; k! s p3 I3 B" v# Y0 h
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- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能
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/ o, [2 U7 u d4 S+ }1 L7 ` n- NVIC_Init(&NVIC_InitStructure);
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- USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //使能接收中断1 Q1 F& ]. n0 ], V1 t
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- USART_ITConfig(USART1, USART_IT_TXE, ENABLE); //使能发送缓冲空中断
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- USART_ITConfig(USART1, USART_IT_TC, ENABLE); //使能发送完成中断
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/ ?$ K' k5 ?0 i8 X/ R6、 使能外设功能:! T: U& a' k+ c7 ]
4 b$ R: m. Q5 ?串口使能:5 Y' n/ e0 v! n/ @' b- ^% B
; S' M# l9 Z/ l5 V; e) W8 L- USART_Cmd(USARTx, ENABLE);
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- ADC使能:, D& ]2 Y1 G2 D- t4 @! x' t
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- ADC_Cmd(ADC1, ENABLE);7 k5 N2 b" b% ?2 ]. I9 `1 C' d# y/ s
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