STM32F103的串口2配置
/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
// RCC system reset(for debug purpose)
RCC_DeInit();
// Enable HSE
RCC_HSEConfig(RCC_HSE_ON);
// Wait till HSE is ready
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
// HCLK = SYSCLK
RCC_HCLKConfig(RCC_SYSCLK_Div1);
// PCLK2 = HCLK
RCC_PCLK2Config(RCC_HCLK_Div1);
// PCLK1 = HCLK/2
RCC_PCLK1Config(RCC_HCLK_Div2);
// ADCCLK = PCLK2/4
RCC_ADCCLKConfig(RCC_PCLK2_Div4);
// Flash 2 wait state
FLASH_SetLatency(FLASH_Latency_2);
// Enable Prefetch Buffer
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
// PLLCLK = 8MHz * 9 = 72 MHz
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
// Enable PLL
RCC_PLLCmd(ENABLE);
// Wait till PLL is ready
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
// Select PLL as system clock source
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
// Wait till PLL is used as system clock source
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
/* Enable peripheral clocks --------------------------------------------------*/
// I2C1 Periph clock enable
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
// Enable DMA clock
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA, ENABLE);
// TIM3 TIM4 I2C1 I2C2 USART clock enable
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3 | RCC_APB1Periph_TIM4 | RCC_APB1Periph_I2C1 | RCC_APB1Periph_I2C2
| RCC_APB1Periph_USART2, ENABLE);
// GPIOA B C D E AFIO clock enable
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC
| RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE);
//USART1 ADC1 clock enable
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_ADC1, ENABLE);
}
/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : Configures Vector Table base location.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
// Set the Vector Table base location at 0x20000000
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else // VECT_TAB_FLASH
// Set the Vector Table base location at 0x08000000
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
// Configure 1 bits for preemption priority
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
// Enable the USART2 Interrupt
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : Configure the GPIOD Pins.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// GPIOA AF Configuration
// PIN_2 for 485-2T PIN_7 for OutLeft Pin_9 for 485-1T Pin_12 for CANT
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_7 | GPIO_Pin_9 | GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// GPIOB AF Configuration
// Pin_7 for OutRight
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// Enable the I2C1 Pins Software Remapping
GPIO_PinRemapConfig(GPIO_Remap_I2C1, ENABLE);
// GPIOB AFOD Configuration
// Pin_8.9 for I2C1 SCL.SDA Pin_10.11 for I2C2 SCL.SDA
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// GPIOA Out Configuration
// Pin_0 for 5620Load Pin_1 for 485-2RTS Pin_5 for 5620DATA Pin_8 for 485-1TRS
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_5 | GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// GPIOB Out Configuration
// Pin_0 for 165-2CLK Pin_12 for 165-1CLK Pin_14 for 165-1EN Pin_15 for 5620CLK
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_12 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// GPIOC OutConfiguration
// Pin_5 for 165-2EN Pin_6.7.8 for 595-1CLK.SCLK.EN Pin_10.11.12 for 595-2CLK.SCLK.EN
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12;
GPIO_Init(GPIOC, &GPIO_InitStructure);
// GPIOD Out Configuration
// Pin_2 for BELL
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_Init(GPIOD, &GPIO_InitStructure);
// GPIOA INFLOATING Configuration
// Pin_3 for 485-2R Pin_4 for OCrossing Pin_6 for LeftOCrossing Pin_10 for 485-1R Pin_11 for CANR
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_6 | GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// GPIOB INFLOATING Configuration
// Pin_1 for SIGNAL Pin_6 for RightOCrossing Pin_13 for 165-1Out
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_6 | GPIO_Pin_13;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// GPIOC INFLOATING Configuration
// Pin_4 for 165-2Out Pin_9 for Interrupt
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_9;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15 | GPIO_Pin_11 | GPIO_Pin_10 | GPIO_Pin_12;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
GPIO_Init(GPIOE, &GPIO_InitStructure);
// GPIOC AIN Configuration
// Pin_0.1.2.3 for ADC0.1.2.3
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
/*******************************************************************************
* Function Name : USART_Configuration
* Description : Configures USART1 and USART2
* Input : None
* Output : None
* Return : None
*******************************************************************************/
USART_InitStructure.USART_BaudRate = 9600；// bps.
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_2;
USART_InitStructure.USART_Parity = USART_Parity_No ;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_RTS_CTS;//None
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_InitStructure.USART_Clock = USART_Clock_Disable;
USART_InitStructure.USART_CPOL = USART_CPOL_Low;
USART_InitStructure.USART_CPHA = USART_CPHA_1Edge;
USART_InitStructure.USART_LastBit = USART_LastBit_Enable;
USART_Init(USART2, &USART_InitStructure);
USART_ITConfig(USART2, USART_IT_TXE, ENABLE);
//USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
// Enable the USART2
USART_Cmd(USART2, ENABLE);
/*******************************************************************************
* Function Name : main
* Description : Main program
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
debug();
#endif
/* System clocks configuration ---------------------------------------------*/
RCC_Configuration();
/* NVIC configuration ------------------------------------------------------*/
NVIC_Configuration();
/* GPIO configuration */
GPIO_Configuration();
// Configure USART
USART_Configuration();
GPIO_WriteBit(GPIOA, GPIO_Pin_1, Bit_RESET);
while(1)
{int i;
for(i=1;i<20;i++)
{
GPIO_WriteBit(GPIOA, GPIO_Pin_1, Bit_RESET);
Delay74595(500);Delay74595(500);Delay74595(500);
USART_SendData(USART2,1);}
}
}
单片机的串口配置
//===========================================
void Set485asTransmitter()
{ P16=0;
}
void Set485asReceiver()
{ P16=1;
}
void Send(unsigned char com)
{
SBUF=com;
while(TI==0){;}
TI=0;
}
//================================================
void IniCPU110592Mhz(unsigned int baud_rate)
{//VB Setting 2400,n,8,1
EX1=1; //Enable Infra-Red Interruption
IT1=1; // Falling Edge Triger INT1 (Infra-red Interruption)
PX1=1; // INT1 (Infra-red) prioritary
EX0=1; // Zero-crossing Interruption Enabled
IT0=1; // -_ INT0 (Zero Interruption)
// TMOD=0x21;/*Timer 0(ZERO_CROSSING): MODE 1, Timer 1:MODE 2 (AUTOCHARGING)
// Timer0 for Zero_crossing Timer1 for BAUD RATE for 4800 Timer2 for Infra_red
PS=1;
switch(baud_rate)
{
case 1200: TH1=TL1=0xe8;PCON=0;TMOD=0x21;break;
case 2400: TH1=TL1=0xf4;PCON=0;TMOD=0x21;break;
case 4800: TH1=TL1=0xfa;PCON=0;TMOD=0x21;break;
case 9600: TH1=TL1=0xfd;PCON=0;TMOD=0x21;break;
case 19200: TH1=TL1=0xfd;PCON=0x80;TMOD=0x21;break;
}
SCON=0x50;// 11 bit
ES=1;
TR1=1; // Start TIMER 1 for BAUD RATE generation
T2CON=0x00; //TF2:0,EXF2:0, RCLK:1, TCLK:1, EXEN2:0, TR2:1,
TR2=1;
TH0=-(1000/256);
TL0=-(1000%256);
ET0=1;
TR0=1;
EA=1;
}
//===========================================
void SSIO(void) interrupt 4 using 1
{
if(RI)
{
RI=0;
SerialRe[SerialReIndicator]=SBUF;
{SerialReIndicator+=1;}
if(SerialReIndicator==30)
SerialReIndicator=0;
}
}
}
//================================
void main(void)
{uchar i;
IniCPU110592Mhz(9600);
while(1)
{
for(i=1;i<21;i++)
//Set485asTransmitter();Delay(90);
//Send(0x1);
Delay(90);
//Set485asReceiver();
}
}
通过以上配置后运行程序，STM32发送数据，单片机接收，单片机接收到的数据要么全是“0x01”，要么全是“0x64”，我查过是否是波特率的问题，经过验证，波特率都是9600.在配置上有什么问题吗？
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