外设设置规则:
$ Q2 F# U- k. k- s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。% N7 T2 ~, e0 @' j- N5 Z, ]: l
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1、 时钟设置:包括引脚时钟和外设时钟:* J) |) ~/ `0 { \' K8 x
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RCC_XXXPeriphClockCmd();
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2 {0 c$ f; ]) r; l: n5 g& B2、 引脚连接:即把引脚和外设功能进行连接;- t- q! F) p4 o3 X. I7 p
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GPIO_PinAFConfig();
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如下功能需要引脚与外设连接。& l( e' d$ Y; A% u T0 }* O, a
! {8 b' ~5 e% i * @arg GPIO_AF_RTC_50Hz, g# p" I7 w3 l; Q% x" |
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* @arg GPIO_AF_MCO& F& k2 X/ l* i! I" |% U [/ }
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* @arg GPIO_AF_TAMPER- V6 @+ l$ x) p9 }4 l/ O3 w: r4 v7 N
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* @arg GPIO_AF_SWJ
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% e$ w% F, H$ w. l; X * @arg GPIO_AF_TRACE- R) E9 C+ _* t6 z
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* @arg GPIO_AF_TIM1" w- g3 t2 m2 b
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* @arg GPIO_AF_TIM2
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' t# \' d5 q8 ]# c. b * @arg GPIO_AF_TIM3
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* @arg GPIO_AF_TIM4
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* @arg GPIO_AF_TIM5
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* @arg GPIO_AF_TIM8/ F& r9 [% F- a
6 g- ]0 J' O, ?# o * @arg GPIO_AF_TIM91 x- w! m R) [/ s$ ?( J
" I& D" Z( k# U& v' P8 K * @arg GPIO_AF_TIM10
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8 p% A; c4 n( Z* D+ _9 i! {# m * @arg GPIO_AF_TIM110 F/ f/ t; T, r, P& b! C0 r
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* @arg GPIO_AF_I2C1
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* @arg GPIO_AF_I2C2
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* @arg GPIO_AF_I2C3! W# B$ `9 g" s) ^) g
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* @arg GPIO_AF_SPI1; z- G; J. k/ Q( o8 M% S$ o
5 u1 p. A L; E* h: k4 L* e * @arg GPIO_AF_SPI2
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$ n& o4 E/ e9 M/ ^ * @arg GPIO_AF_SPI3$ }+ J9 Z H! V7 l
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* @arg GPIO_AF_USART15 ?, K! \5 Z0 p
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* @arg GPIO_AF_USART23 }# {/ [ C. T t. _, R# [
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* @arg GPIO_AF_USART3
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1 F. R# P6 ]. n/ [6 | * @arg GPIO_AF_UART4
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' f6 L1 x! f8 W" r * @arg GPIO_AF_UART5
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* @arg GPIO_AF_USART6
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$ |! L5 j( o0 I * @arg GPIO_AF_CAN1
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* @arg GPIO_AF_CAN2
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* @arg GPIO_AF_TIM12
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4 @2 f% Y$ ^1 ~2 ? * @arg GPIO_AF_TIM13 A5 B0 e2 e4 b" W" S
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* @arg GPIO_AF_TIM14
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5 p- ~3 K3 \0 U b * @arg GPIO_AF_OTG1_FS
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* @arg GPIO_AF_OTG2_HS
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, w7 _% i @: i9 [1 s( p * @arg GPIO_AF_ETH; t) Y0 e& j+ o3 a' H& {7 [
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* @arg GPIO_AF_FSMC
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* @arg GPIO_AF_OTG2_FS
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* @arg GPIO_AF_SDIO f0 m, _; {8 y% W$ y {; F `
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* @arg GPIO_AF_DCMI
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* @arg GPIO_AF_EVENTOUT
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3、 初始化GPIO配置:
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# i' y! I& a1 L+ E2 ZGPIO_Init();
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4、 外设初始化:+ c- [. ?& c: }" Y( t
( R+ E7 A+ C) \; O `: h" `: X如UART初始化如下:) P' M+ }6 j0 [6 Z" w$ E$ i, L
7 q# r1 {5 ]( H: J- USART_InitStructure.USART_BaudRate = 115200;# u1 H3 Z$ B" E' l3 V! o
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- USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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- USART_InitStructure.USART_StopBits = USART_StopBits_1;7 V4 L* J6 ?& w
: @0 f# s' H( ~- USART_InitStructure.USART_Parity = USART_Parity_No;
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?" o3 z2 E* n' N' _- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;9 t! w7 [6 }4 w' u" r
. E1 h9 R- o; }& k1 ^" Y, U: g- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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& ^4 G4 Z8 o" j: P- USART_Init(USARTx, &USART_InitStructure);
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ADC初始化如下:(多路模式)+ Q" g& N+ z* e c
- ?* T F9 c$ V3 R- // DMA1_Stream0 channel0 configuration **************************************/
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- DMA_DeInit(DMA2_Stream0);
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- DMA_InitStructure.DMA_Channel = DMA_Channel_0; ! b& J" A3 q+ F' D0 |
/ f3 @! F/ k: _5 P/ V- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS; //定义外设基址, A& w" K; `) s3 c- ?" |
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- DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADCConvertedValue; //定义寄存器基址" e6 H' M( E' i5 h4 q
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- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //定义DMA传输模式从外设到内存
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- DMA_InitStructure.DMA_BufferSize = 4; //定义buffer大小,根据通道数来定: _, L/ Q# ^; Z
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- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变
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- 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
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1 J' L1 [/ b; Y1 u, [# c8 h# \- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //DMA存储器数据大小,16位半字7 [& K. R, o( |& o
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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, j% p. V; V8 ]/ i9 O/ z
8 I3 t4 G: T% j# \# l% i- DMA_InitStructure.DMA_DirectMode = DMA_DirectMode_Disable; //直接传输模式无效 DMA_InitStructure.DMA_FifoThreshold = DMA_FifoThreshold_HalfFull;: D, M1 b, x4 K! B I1 a
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- DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;3 k( O' O0 }. p$ I) Q6 \- C* y$ F
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- DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;9 p) _& [/ f- M7 ~9 R
9 J o. q+ T7 U7 i( ^0 v" p; {, o- DMA_Init(DMA2_Stream0, &DMA_InitStructure);
复制代码- //************ DMA2_Stream0 enable ************/7 F; w4 Y- |/ L
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- DMA_Cmd(DMA2_Stream0, ENABLE); //使能DMA流0
复制代码- //***************** ADCs DeInit ***************/
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4 @1 d) Z, x2 ~# ~3 t/ G- ADC_DeInit(); //ADC重初始化
复制代码- //************* ADC Common Init ****************/9 {7 [# l* O% d/ ~- k8 p# J
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- ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; //ADC独立模式# V) J) j4 k+ q7 S9 u& @5 l
2 K2 t2 G* f- b9 P- ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2; //ADC采样周期2分频
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- ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;. d' x) J4 b6 J% n# N
( R% F4 J, Y0 J* X$ v- ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; //采样周期* g3 q0 @+ b _' P! h1 \+ H) d
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- ADC_CommonInit(&ADC_CommonInitStructure); //基本初始化
复制代码- //*************** ADC1 Init ********************/ H# O. R7 p, n; w
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- ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //ADC采样精度
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7 u$ y6 a, [5 E' r& G, ?- ADC_InitStructure.ADC_ScanConvMode = ENABLE; //采用扫描模式,因为多路
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3 [, F2 p. j) U$ C- ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //连续扫描模式
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! {, e1 ?8 `% F1 |- i% ]0 x- 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
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$ R( i$ t4 S0 w2 {, [- ADC_InitStructure.ADC_NbrOfChannel = 4; //采样通道数3 V+ [4 P/ u) G4 a- M9 V
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- 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);! |6 Y5 `+ ^/ l
6 k+ l& O: ^% c: J( I- ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 2, ADC_SampleTime_3Cycles);5 t( |! O4 _& w# n7 Q; y) C
, K) O7 x9 m& s; s y- ^0 c: {- ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 3, ADC_SampleTime_3Cycles); f. H( z7 P) K# c; x* e+ ]/ c
2 _( t3 r2 F9 R8 K, v# }( S- ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 4, ADC_SampleTime_3Cycles);
复制代码- //********* Enable DMA request after last transfer (Multi-ADC mode) *********/3 d9 N2 y ~) F' b7 ]' @% ^% Y
: }) S$ {7 g" k# Q: r2 J- ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
复制代码- //*********** Enable ADC1 DMA ****************// b# K- N8 A- B' K/ q" y: @; H
) w, F8 f3 ~& q. L- ADC_DMACmd(ADC1, ENABLE);
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复制代码- //*************** Enable ADC1 ***************/: Y7 W2 @' z9 O U
) k: x/ C8 ~! U* X- ADC_Cmd(ADC1, ENABLE);
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, e9 F8 P5 r! K# _- //******* Start ADC1 Software Conversion *****/9 f8 D7 |4 Z% h" Y- ^) T2 u
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- ADC_SoftwareStartConv(ADC1); //软启动开始采样
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5、 中端配置:
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以下为串口中断配置:# a: x8 e' Q" T5 U7 `' G5 R' d
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- void NVIC_Configuration(void)
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- NVIC_InitTypeDef NVIC_InitStructure;# j; j' V8 W+ Y- H0 Z/ J s
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- /* Configure the NVIC Preemption Priority Bits */ , M8 m$ v/ G8 Z8 g! e* g' M
8 o) `. g- ?' T1 D- s- /* Configure one bit for preemption priority */
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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 */
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4 w/ f* |9 l# q, ?+ L1 P, H" ~5 Y- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
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- /* Enable the USART1 Interrupt */
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! t' S m, k, }- NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn; //设置串口5中断
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+ w6 @* P V0 c8 w% o7 b$ g- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级 0
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1 {9 o" \. P( B8 e' w( ]- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级为0
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- ?7 [1 I0 ]9 Y- `- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能3 K8 Y y+ G, [1 ^) x" N4 A6 Z! _
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- NVIC_Init(&NVIC_InitStructure);
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- USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //使能接收中断
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- USART_ITConfig(USART1, USART_IT_TXE, ENABLE); //使能发送缓冲空中断
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$ I+ K t3 `! y( Z- USART_ITConfig(USART1, USART_IT_TC, ENABLE); //使能发送完成中断
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6、 使能外设功能:
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4 y' k5 [5 Z2 c8 m* Z) V7 `串口使能:9 z0 ]& ?) {4 O1 B. i6 j* `4 q
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- USART_Cmd(USARTx, ENABLE);
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4 A5 `8 V2 [) p: Z# p- ADC使能:# P( Y7 c3 z3 N {8 i: \6 I
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- ADC_Cmd(ADC1, ENABLE);
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