【经验分享】STM32F2系列外设设置规则

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STMCU小助手发布时间：2021-12-4 17:03

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文章简介:	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。

外设设置规则：
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。

1、  时钟设置：包括引脚时钟和外设时钟：

RCC_XXXPeriphClockCmd();

2、  引脚连接：即把引脚和外设功能进行连接；

GPIO_PinAFConfig();

如下功能需要引脚与外设连接。

  *    @arg GPIO_AF_RTC_50Hz

  *    @arg GPIO_AF_MCO

  *    @arg GPIO_AF_TAMPER

  *    @arg GPIO_AF_SWJ

  *    @arg GPIO_AF_TRACE

  *    @arg GPIO_AF_TIM1

  *    @arg GPIO_AF_TIM2

  *    @arg GPIO_AF_TIM3

  *    @arg GPIO_AF_TIM4

  *    @arg GPIO_AF_TIM5

  *    @arg GPIO_AF_TIM8

  *    @arg GPIO_AF_TIM9

  *    @arg GPIO_AF_TIM10

  *    @arg GPIO_AF_TIM11

  *    @arg GPIO_AF_I2C1

  *    @arg GPIO_AF_I2C2

  *    @arg GPIO_AF_I2C3

  *    @arg GPIO_AF_SPI1

  *    @arg GPIO_AF_SPI2

  *    @arg GPIO_AF_SPI3

  *    @arg GPIO_AF_USART1

  *    @arg GPIO_AF_USART2

  *    @arg GPIO_AF_USART3

  *    @arg GPIO_AF_UART4

  *    @arg GPIO_AF_UART5

  *    @arg GPIO_AF_USART6

  *    @arg GPIO_AF_CAN1

  *    @arg GPIO_AF_CAN2

  *    @arg GPIO_AF_TIM12

  *    @arg GPIO_AF_TIM13

  *    @arg GPIO_AF_TIM14

  *    @arg GPIO_AF_OTG1_FS

  *    @arg GPIO_AF_OTG2_HS

  *    @arg GPIO_AF_ETH

  *    @arg GPIO_AF_FSMC

  *    @arg GPIO_AF_OTG2_FS

  *    @arg GPIO_AF_SDIO

  *    @arg GPIO_AF_DCMI

  *    @arg GPIO_AF_EVENTOUT

3、  初始化GPIO配置：

GPIO_Init();

4、  外设初始化：

如UART初始化如下：

USART_InitStructure.USART_BaudRate = 115200;6 O/ h+ {4 |5 Y# W2 ~* R5 b) y
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No;# G1 d. G6 f& ^
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;- y: D* Q9 _6 d/ e- j
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;3 T7 |+ E9 \6 \% P" i3 I7 `
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USART_Init(USARTx, &USART_InitStructure)；

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ADC初始化如下：（多路模式）

// DMA1_Stream0 channel0 configuration **************************************/
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DMA_DeInit(DMA2_Stream0);
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DMA_InitStructure.DMA_Channel = DMA_Channel_0;
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DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS; //定义外设基址- G# g0 @2 A( V: r5 c
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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
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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$ y0 M$ r: K2 @
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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）2 W2 d) N6 ^ Q. q) F9 {
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DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //DMA外设数据大小，16位半字/ e! o: q0 @# H% K! |: D! B/ a
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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
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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;
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DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;, o- {" ]$ E" R
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DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;' @: s+ @! D4 A; _
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DMA_Init(DMA2_Stream0, &DMA_InitStructure);

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//************ DMA2_Stream0 enable ************/* `4 T/ b; ], F( K
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DMA_Cmd(DMA2_Stream0, ENABLE); //使能DMA流0

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//***************** ADCs DeInit ***************/
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ADC_DeInit(); //ADC重初始化

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//************* ADC Common Init ****************/+ v: }( R, ?0 T3 k1 v6 p7 Z
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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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ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; //采样周期$ J% `# M" o x5 |! X3 J
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ADC_CommonInit(&ADC_CommonInitStructure); //基本初始化

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//*************** ADC1 Init ********************/
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ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //ADC采样精度, X6 S' g& B& u
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ADC_InitStructure.ADC_ScanConvMode = ENABLE; //采用扫描模式，因为多路
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ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //连续扫描模式6 b: x9 a$ s0 D
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ADC_InitStructure.ADC_ExternalTrigConvPolarity = ADC_ExternalTrigConvPolarity_None;//无外部触发& u0 C1 F; A0 u4 f- P, O" i
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ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //数据右对齐
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ADC_InitStructure.ADC_NbrOfChannel = 4; //采样通道数: L% L8 q' M. f
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ADC_Init(ADC1, &ADC_InitStructure);

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//************ ADC1 regular channel12 configuration ************/. h4 l* ~; R2 P( K1 e- E! P8 }$ _1 v
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ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 1, ADC_SampleTime_3Cycles);' j9 {8 }) M, c' t7 ~1 Y& f. F
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ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 2, ADC_SampleTime_3Cycles);9 R* {) \3 t R* K; M- z) S8 m9 j
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ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 3, ADC_SampleTime_3Cycles);/ s4 R0 b d8 b3 n) S o
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ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 4, ADC_SampleTime_3Cycles);

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//********* Enable DMA request after last transfer (Multi-ADC mode) *********/3 r" i- K3 C; ?# K3 X' T: e, w
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ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

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//*********** Enable ADC1 DMA ****************/9 p- a% }# d' K$ v
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ADC_DMACmd(ADC1, ENABLE);
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//*************** Enable ADC1 ***************/0 o% M' }9 e* m$ A+ M
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ADC_Cmd(ADC1, ENABLE);

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//******* 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：

以下为串口中断配置：

void NVIC_Configuration(void)& ], d( A7 m! N2 s8 {# c$ V
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NVIC_InitTypeDef NVIC_InitStructure;
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/* Configure the NVIC Preemption Priority Bits */ ! Y( {* Q7 E0 V7 ?, p0 r* K% ^
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/* 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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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); 7 j+ s0 k) J1 x) ^
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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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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! W$ J& l! }; |
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能7 `7 v; F, Z+ p; S) O
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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; G J a" k# c2 ~! S
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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5 r0 ^! M/ H- R& `, N+ d o