外设设置规则:- N# B" `! q/ m# D G
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。/ G$ x9 e u. g# j/ @6 n3 J
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1、 时钟设置:包括引脚时钟和外设时钟:: D' S- m# ^5 B
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2、 引脚连接:即把引脚和外设功能进行连接;) H- |* N9 l5 }9 h9 X8 r2 z
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如下功能需要引脚与外设连接。
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& J, v U1 ?! U * @arg GPIO_AF_RTC_50Hz# E- f8 ~' b# R3 T
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* @arg GPIO_AF_MCO+ ?+ ]! T( B4 [+ S7 _5 D6 b
: G; ?! F& B; u * @arg GPIO_AF_TAMPER2 S; Y+ R4 d" m2 Z3 u; B
- b" j; F" W+ V9 i" x0 `% e * @arg GPIO_AF_SWJ( i) {. T8 X# `6 }! ?
4 `" x# u6 c0 Q8 ]& z * @arg GPIO_AF_TRACE
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& n: ^) f9 D" _( p * @arg GPIO_AF_TIM1
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* @arg GPIO_AF_TIM2
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3 L* Y: L6 f9 R * @arg GPIO_AF_TIM3
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* @arg GPIO_AF_TIM44 A( @! J/ @" {
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* @arg GPIO_AF_TIM5( f* j+ K: i# k) W1 V V
; N4 p. _1 x1 Q' c! G0 g * @arg GPIO_AF_TIM8
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* @arg GPIO_AF_TIM9
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* @arg GPIO_AF_TIM10" v* V! ?* a; S% c; ~: D' T- k$ v
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* @arg GPIO_AF_TIM11- Q0 k5 O% F4 w* X) K2 t6 ~8 C/ B
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* @arg GPIO_AF_I2C1
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: C$ t+ O" s# M u7 x# K8 h * @arg GPIO_AF_I2C20 z" B# c2 i) D8 M" D9 k5 U
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* @arg GPIO_AF_I2C31 Z( e' @ F7 S& Y: Y8 h' u M# R$ R
2 Q. a" y1 F3 }0 q * @arg GPIO_AF_SPI1. ~# E) v# U' o3 W2 E, ^
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* @arg GPIO_AF_SPI2
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: t1 T& A' q% U. v' w) k * @arg GPIO_AF_SPI3
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* @arg GPIO_AF_USART1. b9 E# a6 }, ]% c4 O5 o9 V
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* @arg GPIO_AF_USART22 [. e B% n& T$ o2 R' _
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* @arg GPIO_AF_USART35 L, [5 l- [3 v1 s! c/ \9 G, i
0 J* V5 _) }( ^: U * @arg GPIO_AF_UART4! |) l0 x' j6 f5 z. X2 t+ k
+ b7 d6 c+ }3 M% D * @arg GPIO_AF_UART5/ {0 e M, N% L- G& D! R/ {& n3 D" E- V3 ?
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* @arg GPIO_AF_USART6( f7 J9 J! \' M* e8 o* Q# A
) m7 U1 y6 R9 X+ J7 \; G * @arg GPIO_AF_CAN1
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. C) L; O n" U * @arg GPIO_AF_CAN2$ e @6 |4 f9 @5 n/ w
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* @arg GPIO_AF_TIM123 }. L* F! ~- b; C' u [6 {( M) A
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* @arg GPIO_AF_TIM13
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, d" }! A2 a, v6 B4 z * @arg GPIO_AF_TIM14$ @7 m! \9 p8 M& P$ x3 |6 G
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* @arg GPIO_AF_OTG1_FS. a( U, ~6 n6 ?, b
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* @arg GPIO_AF_OTG2_HS
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* @arg GPIO_AF_ETH
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7 U6 a" x( \+ l: r" S. g * @arg GPIO_AF_FSMC1 P6 I3 k9 K/ X g" ^7 r. z
: p6 O0 L5 d6 ^' ^ * @arg GPIO_AF_OTG2_FS8 f/ o9 W/ H8 i- u
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* @arg GPIO_AF_SDIO
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9 C, r9 L0 A4 V7 S7 a- D * @arg GPIO_AF_DCMI
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* @arg GPIO_AF_EVENTOUT" h# T2 }( F/ m+ {2 O
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3、 初始化GPIO配置:
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GPIO_Init();
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+ V" ?6 v. @% L1 Z/ P2 R: G% Q; r* A4、 外设初始化:% ^3 Q9 f$ O# d) ?
, v" c8 g& o% H4 I如UART初始化如下:
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- USART_InitStructure.USART_BaudRate = 115200;* m) a; v1 H7 P7 p& }3 p
6 r* s6 ? ?( i( R8 d% T# b- USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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- USART_InitStructure.USART_StopBits = USART_StopBits_1;: } `& V$ Z- ^; s. v1 R6 ?2 Q
& I; t L% |- a& ?' n- USART_InitStructure.USART_Parity = USART_Parity_No;
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- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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. |$ j# t) z% w; G9 ?- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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- USART_Init(USARTx, &USART_InitStructure);
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ADC初始化如下:(多路模式). y; D9 i. u; Y7 J3 q& M4 |
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- // DMA1_Stream0 channel0 configuration **************************************/
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- DMA_DeInit(DMA2_Stream0); J* z6 o d; d" O1 v( V L2 V) {
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- DMA_InitStructure.DMA_Channel = DMA_Channel_0; * H! g- {; n' W8 i3 B
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- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS; //定义外设基址 }3 \3 p1 G% I, A2 T
. M& n3 @- E. l# X4 W% P7 [% d- DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADCConvertedValue; //定义寄存器基址. N0 z: _8 E0 X8 x
- u; }6 W7 Y/ t! g2 S- ?8 V3 E- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //定义DMA传输模式从外设到内存3 p4 x3 E4 p% ?
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- DMA_InitStructure.DMA_BufferSize = 4; //定义buffer大小,根据通道数来定% H# b! }! {# n6 ^6 t1 [
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- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变
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' _% A% I9 P0 ?8 } M- 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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$ \# R5 X9 H& B- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //DMA外设数据大小,16位半字. e* |1 ?) u z7 [7 r% V2 c" T
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- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //DMA存储器数据大小,16位半字5 b1 R* H- a0 C8 _& m$ k
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- DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //模式为循环模式
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0 R, U* X0 }3 P$ q/ A: _- 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;7 F+ x3 f& {2 ?6 ~* m- r
- o$ v! Y& e% ?9 s8 b" A- DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;3 Y5 L% ]$ C9 Q2 k" v( e
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- DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;2 ?4 \' X6 D d y
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- DMA_Init(DMA2_Stream0, &DMA_InitStructure);
复制代码- //************ DMA2_Stream0 enable ************/# k% g: U- y2 |9 n
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- DMA_Cmd(DMA2_Stream0, ENABLE); //使能DMA流0
复制代码- //***************** ADCs DeInit ***************/
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- ADC_DeInit(); //ADC重初始化
复制代码- //************* ADC Common Init ****************/
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$ H: s5 M6 `$ W% w4 F* Z- ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; //ADC独立模式! [' c; w. ?. I0 a' n# q
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- ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2; //ADC采样周期2分频
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8 z5 B1 n. ^* F$ m# M- ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
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- ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; //采样周期
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" p7 F6 y' \" N+ f( p/ |- ADC_CommonInit(&ADC_CommonInitStructure); //基本初始化
复制代码- //*************** ADC1 Init ********************/0 C% h! M9 @# O
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- ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //ADC采样精度
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- ADC_InitStructure.ADC_ScanConvMode = ENABLE; //采用扫描模式,因为多路
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& D }0 @8 y5 j3 B f( w Q$ Q- ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //连续扫描模式
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8 k p% C6 S( a! W/ x" i) ~! t- ADC_InitStructure.ADC_ExternalTrigConvPolarity = ADC_ExternalTrigConvPolarity_None;//无外部触发2 y) T6 ]' m; y8 |( h
0 H# n% S, T: V( g/ l- ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //数据右对齐
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& G' h; E4 M6 j; Z' T4 {- M" Z- ADC_InitStructure.ADC_NbrOfChannel = 4; //采样通道数
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- ADC_Init(ADC1, &ADC_InitStructure);
复制代码- //************ ADC1 regular channel12 configuration ************/
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2 V: i& p) e B- ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 1, ADC_SampleTime_3Cycles);7 \9 r# u @( O1 x
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- ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 2, ADC_SampleTime_3Cycles);: Q: S6 A2 }/ B h) Q3 U/ |
% A; b! J2 ~' }! Z/ C2 w' v- ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 3, ADC_SampleTime_3Cycles);( @& U6 [% h: R4 ]( F
0 U j9 J3 R& a0 ?- ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 4, ADC_SampleTime_3Cycles);
复制代码- //********* Enable DMA request after last transfer (Multi-ADC mode) *********/, _, Y w. ?/ `$ D
" }! x; a3 F, h# v4 o4 ?- U- ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
复制代码- //*********** Enable ADC1 DMA ****************/
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- ADC_DMACmd(ADC1, ENABLE);7 |- z0 F# R3 E* L
复制代码- //*************** Enable ADC1 ***************/! g& {5 u4 Z# b$ g& `) V% |
. O, M b5 L- v4 ?- ADC_Cmd(ADC1, ENABLE);
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- //******* Start ADC1 Software Conversion *****/; A" S; H& Q, Z% F7 ]' c- M! Y- `
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- ADC_SoftwareStartConv(ADC1); //软启动开始采样
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- v4 Z2 E( z0 c( r7 m8 F5、 中端配置:6 @% w, T) E- O$ N
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以下为串口中断配置:2 V. u! u' ?6 x/ e) x
& f3 O- x& ?$ O- void NVIC_Configuration(void)
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- NVIC_InitTypeDef NVIC_InitStructure;
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& R7 v7 x5 \. e: O3 b- /* Configure the NVIC Preemption Priority Bits */ 8 t; {9 }! b0 z P9 ^/ ~+ O" u
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- /* Configure one bit for preemption priority */4 M; J' g) d3 o: T; L H
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- /* 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 */ , w7 o& d+ C8 k0 A% O
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- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
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- /* Enable the USART1 Interrupt */
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5 p* f6 |5 [% u; K- NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn; //设置串口5中断& W: S# e9 K& B) W
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- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级 0
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2 b: K+ z2 R; \* C* N/ i- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级为0
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- K" n8 C. E+ }+ K3 g- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能7 Y# i' B" I, l4 X6 E
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- NVIC_Init(&NVIC_InitStructure);- a# w x& k4 A' W% R
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t) m3 |' M& l( @' \- USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //使能接收中断( c+ w4 T% J1 W l/ ^/ l8 c
' j2 D1 ]7 c; y( a- USART_ITConfig(USART1, USART_IT_TXE, ENABLE); //使能发送缓冲空中断0 h% @8 r* Q0 Z0 E
2 [+ ?3 d( J) O& C1 |, w6 a- USART_ITConfig(USART1, USART_IT_TC, ENABLE); //使能发送完成中断: i2 y% ~. ^- s* B
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6 d1 {8 n' A# x0 f8 W8 @! O7 D6、 使能外设功能:
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串口使能:" ^4 M& m1 G! A, G
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- USART_Cmd(USARTx, ENABLE);
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- ADC使能:
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- ADC_Cmd(ADC1, ENABLE);/ P2 A) k1 f+ ?, J
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