外设设置规则:" { P! L- x" u x
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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$ C* \7 n2 e* V1、 时钟设置:包括引脚时钟和外设时钟:
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$ c' w% c/ L- HRCC_XXXPeriphClockCmd();
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; O6 {1 ?: A" c' E3 ]2 @: F- }2、 引脚连接:即把引脚和外设功能进行连接;
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GPIO_PinAFConfig();
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如下功能需要引脚与外设连接。. P2 C2 G; Z- O" G( l. K: p
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* @arg GPIO_AF_RTC_50Hz
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* @arg GPIO_AF_MCO0 A& O0 n1 T! b6 d* [( {
' W, p5 B% V4 P6 B; y% |* p8 ` d * @arg GPIO_AF_TAMPER h5 c4 f# ^6 w
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* @arg GPIO_AF_SWJ
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* @arg GPIO_AF_TRACE3 Q u% p; G, r1 b5 [+ Q9 z
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* @arg GPIO_AF_TIM1
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~9 _0 M4 d" J * @arg GPIO_AF_TIM2) _7 b; A* r4 C
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* @arg GPIO_AF_TIM3; z3 @! Y! _, G# w, \
1 \ K T, ?4 h( C s* V * @arg GPIO_AF_TIM4. s: I9 r& Q3 C
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* @arg GPIO_AF_TIM5
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* @arg GPIO_AF_TIM8% N1 _/ q- m2 b) B# }
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* @arg GPIO_AF_TIM9- {, {* ]9 ^* l, T3 q: Q
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* @arg GPIO_AF_TIM10
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* a4 M5 N) ^6 y0 A* I: U8 t * @arg GPIO_AF_TIM11
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* @arg GPIO_AF_I2C1
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% X/ W; @% H" l" z3 z * @arg GPIO_AF_I2C2
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* @arg GPIO_AF_I2C3
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* W9 } f4 f7 O% {( B * @arg GPIO_AF_SPI1
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* @arg GPIO_AF_SPI2
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* @arg GPIO_AF_SPI3" h* N/ P g1 w
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* @arg GPIO_AF_USART1# L4 g- d+ d- g8 b# Z- R7 O
3 f0 c. [0 }9 W# N6 O/ M * @arg GPIO_AF_USART2: P; E1 p3 C, ~! e* W
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* @arg GPIO_AF_USART3- y7 L( m8 P, B; d- ]( t
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* @arg GPIO_AF_UART4; A4 D4 u- f' d3 f+ L
" N" k$ d$ F$ _* p4 W * @arg GPIO_AF_UART54 ?+ R' l! }( |+ N4 V% a- Z9 i1 R3 n& I
8 O1 W. f+ B! W, _! l * @arg GPIO_AF_USART6
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6 ?" y) a, ]. U: m7 H * @arg GPIO_AF_CAN1/ E6 a2 E; b4 Q. {# q9 E+ d) A
0 u+ i2 j( N I * @arg GPIO_AF_CAN2) v2 z6 g: {; f, w% `
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* @arg GPIO_AF_TIM12& m3 o% w3 }- r1 k9 D
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* @arg GPIO_AF_TIM13
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U2 Z. ]( p* d3 F; o1 u * @arg GPIO_AF_TIM14
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8 Y% K' ^: u6 z( B * @arg GPIO_AF_OTG1_FS& J7 o- A5 g/ R- g
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* @arg GPIO_AF_OTG2_HS3 g4 W- v6 F" k* Q6 }1 v
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* @arg GPIO_AF_ETH
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* @arg GPIO_AF_FSMC% Y8 i* B1 m3 o; ~
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* @arg GPIO_AF_OTG2_FS9 P8 c9 G% y$ a3 h2 G
9 z( Z, C H6 h& `! d * @arg GPIO_AF_SDIO
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* @arg GPIO_AF_DCMI
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, G$ E, Z& F$ x: H) \4 k& ]& R G4 n3、 初始化GPIO配置:2 x, u* q2 n3 o8 ^
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GPIO_Init();% p, T* S5 s4 p- \9 }: G
9 I s8 |% |. K) H/ E$ q4、 外设初始化:
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6 y! W7 `4 V4 O7 j; @如UART初始化如下:
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1 e0 t* K6 X/ @- USART_InitStructure.USART_BaudRate = 115200;( T7 ? g7 l8 r
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- USART_InitStructure.USART_StopBits = USART_StopBits_1;
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- USART_InitStructure.USART_Parity = USART_Parity_No;4 T" k% s/ G# k( z
/ }! E4 ~/ {# I, d1 m+ C- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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, K( z1 K# `# k# F K+ B$ }% h2 F- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;" g7 O+ y* G, f2 X: J
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- USART_Init(USARTx, &USART_InitStructure);
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7 d/ V4 y0 {1 {- D. t7 ^ADC初始化如下:(多路模式)' t! }6 q# J& K/ z
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- // DMA1_Stream0 channel0 configuration **************************************/
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- DMA_DeInit(DMA2_Stream0);
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- DMA_InitStructure.DMA_Channel = DMA_Channel_0; . I6 R0 w, _7 r) \1 g/ T
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- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS; //定义外设基址
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- 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! C0 q# i( e) x0 |
0 M! m$ r. }2 y1 C; F- DMA_InitStructure.DMA_BufferSize = 4; //定义buffer大小,根据通道数来定
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' m1 p- s% A, X6 \5 L* g j- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变+ H1 X* q4 C3 R
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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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) q6 ~: S' V" c+ f9 t5 B- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //DMA外设数据大小,16位半字
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- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //DMA存储器数据大小,16位半字
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- DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //模式为循环模式. ^9 m% T+ F0 p C
: Z2 [( ?! \' C ^- DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA优先级高% p" E* }0 c+ i. V- B, H. {1 z
( v; h% R+ E4 X1 n- DMA_InitStructure.DMA_DirectMode = DMA_DirectMode_Disable; //直接传输模式无效 DMA_InitStructure.DMA_FifoThreshold = DMA_FifoThreshold_HalfFull;
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- DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
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- DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
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- DMA_Init(DMA2_Stream0, &DMA_InitStructure);
复制代码- //************ DMA2_Stream0 enable ************/: } k, {' v. C* n
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- DMA_Cmd(DMA2_Stream0, ENABLE); //使能DMA流0
复制代码- //***************** ADCs DeInit ***************/ 0 I2 {8 ?3 w- v, q* s# B$ J
# Z0 I" z; S3 J4 K, F) @4 D8 D- ADC_DeInit(); //ADC重初始化
复制代码- //************* ADC Common Init ****************/1 D) I( |4 e' j( Y& Y1 j2 O
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- ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; //ADC独立模式
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- 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;
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' a7 f# @$ S2 z7 o1 T& u% B- ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; //采样周期* o3 A4 m$ v, \
, k. ?8 i, L9 U( O- ADC_CommonInit(&ADC_CommonInitStructure); //基本初始化
复制代码- //*************** ADC1 Init ********************/- m* [8 [! @+ g1 n
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- ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //ADC采样精度
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. v+ ?8 a" T+ R8 z u$ A% }+ L- ADC_InitStructure.ADC_ScanConvMode = ENABLE; //采用扫描模式,因为多路
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j' g4 \" q3 R- ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //连续扫描模式* P. |# {. b" F; H
9 a! V e1 f0 o0 ~, J% i- ADC_InitStructure.ADC_ExternalTrigConvPolarity = ADC_ExternalTrigConvPolarity_None;//无外部触发
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; @( e: h/ ]2 ^; w. M. M& c/ y- ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //数据右对齐; B5 Q9 g0 H- W% ^$ F( k
' p9 r7 F$ R* E" a! D# \3 m- 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 ************/9 q6 R5 o7 f8 x9 I9 d: D/ X
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- ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 1, ADC_SampleTime_3Cycles);
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- ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 2, ADC_SampleTime_3Cycles);
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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) *********/
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- ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
复制代码- //*********** Enable ADC1 DMA ****************/
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6 ]: e l5 d. P# S( `- ADC_DMACmd(ADC1, ENABLE);
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复制代码- //*************** Enable ADC1 ***************/" Y, c1 r& V' X' C4 ]8 M
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- ADC_Cmd(ADC1, ENABLE);
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4 E) B7 G2 h3 v0 O- //******* Start ADC1 Software Conversion *****/
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- ADC_SoftwareStartConv(ADC1); //软启动开始采样
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5、 中端配置:$ I% `6 H) k& C8 {+ z1 t
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以下为串口中断配置:
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- void NVIC_Configuration(void)$ N! N+ x4 T# ]" \- w; H
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- NVIC_InitTypeDef NVIC_InitStructure;+ p, T7 Z: Y# l; M
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- /* Configure the NVIC Preemption Priority Bits */
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- /* Configure one bit for preemption priority */; F; o' S8 q& g* G' \7 y& J
: \& l! t- v* H. U: w; |- /* 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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- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
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- /* Enable the USART1 Interrupt */
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- NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn; //设置串口5中断
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^0 l' Q3 ?/ `, {! i3 J0 R6 c, t8 ~! L- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级 0
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- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级为0( r( Y9 m# ~0 N( o8 t
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- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能
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- NVIC_Init(&NVIC_InitStructure);
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& T% b# P3 @/ D- s# ]" Q- USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //使能接收中断& e" h; Y8 X: J; i( }1 [9 C
4 z0 ]- c( L. f: U4 B' Y z- USART_ITConfig(USART1, USART_IT_TXE, ENABLE); //使能发送缓冲空中断+ A4 l& S" ~( p& |
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- USART_ITConfig(USART1, USART_IT_TC, ENABLE); //使能发送完成中断
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4 {0 a' `& I4 g6、 使能外设功能:( K! A. n& S- U. w* @3 i
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串口使能:4 g2 L+ N2 n1 Z
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- USART_Cmd(USARTx, ENABLE);
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- ADC使能:
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- ADC_Cmd(ADC1, ENABLE);$ I6 r2 B/ t* \" I# _, }3 o
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