If # 1
# pragma import (__use_no_semihosting)
//the standard library needs the support of function
Struct __FILE
{
Int handle;
};

The FILE __stdout;
//define _sys_exit () to avoid using half a host mode
Void _sys_exit (int x)
{
X=x;
}
//redefine fputc function
Int fputc (int ch, FILE * f)
{
While ((USART6 - & gt; SR& 0 x40)==0);//cycle to send, until completion of the send
USART6 - & gt; DR=(u8) ch;
return ch;
}
# endif

Void uart6_init (u32 bound)
{
//set the GPIO port
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHB1PeriphClockCmd (RCC_AHB1Periph_GPIOG, ENABLE);//can make GPIOG clock
RCC_APB2PeriphClockCmd (RCC_APB2Periph_USART6, ENABLE);//can make USART6 clock

//a serial port 6 corresponding pins reuse mapping
GPIO_PinAFConfig (GPIOG, GPIO_PinSource9 GPIO_AF_USART6);//GPIOG9 reuse for USART6
GPIO_PinAFConfig (GPIOG, GPIO_PinSource14 GPIO_AF_USART6);//GPIOG14 reuse for USART6

//USART6 port configuration
GPIO_InitStructure. GPIO_Pin=GPIO_Pin_9 | GPIO_Pin_14;//GPIOG9 GPIOG14
GPIO_InitStructure. GPIO_Mode=GPIO_Mode_AF;//multiplexing function
GPIO_InitStructure. GPIO_Speed=GPIO_Speed_50MHz;//speed 50 MHZ
GPIO_InitStructure. GPIO_OType=GPIO_OType_PP;//push-pull multiplexing output
GPIO_InitStructure. GPIO_PuPd=GPIO_PuPd_UP;//pull
GPIO_Init (GPIOG, & amp; GPIO_InitStructure);//initialize

//USART6 initialization setting
USART_InitStructure. USART_BaudRate=bound;//baud rate setting
USART_InitStructure. USART_WordLength=USART_WordLength_8b;//word length of 8 bits of data format
USART_InitStructure. USART_StopBits=USART_StopBits_1;//a stop bit
USART_InitStructure. USART_Parity=USART_Parity_No;//and white parity bit
USART_InitStructure. USART_HardwareFlowControl=USART_HardwareFlowControl_None;//no hardware flow control
USART_InitStructure. USART_Mode=USART_Mode_Rx | USART_Mode_Tx;//transceiver model
USART_Init (USART6, & amp; USART_InitStructure);//initialize a serial port 6

USART_Cmd (USART6, ENABLE);//can make a serial port 6

USART_ClearFlag (USART6 USART_FLAG_TC);

USART_ITConfig (USART6, USART_IT_RXNE, ENABLE);//open the relevant interrupt

//Usart6 NVIC configuration
NVIC_InitStructure. NVIC_IRQChannel=USART6_IRQn;//a serial port 6 interrupt channel
NVIC_InitStructure. NVIC_IRQChannelPreemptionPriority=3;//take priority 3
NVIC_InitStructure. NVIC_IRQChannelSubPriority=2;//child priority 2
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;//IRQ channel can make
NVIC_Init (& amp; NVIC_InitStructure);//initializes the NVIC register according to the specified parameters
}


Void USART6_IRQHandler (void)//a serial port 6 interrupt service routines
{
U8 Res;

If (USART_GetITStatus (USART6, USART_IT_RXNE)!=RESET)//receiving interrupt
{
Res=USART_ReceiveData (USART6);//(USART1 - & gt; DR);//read the received data
}
}

CodePudding user response:

How much bound, wrong pin? If you have other initialization code, first shielding

CodePudding user response:

The find the problem, thanks, I will pick up the serial port connection 1

CodePudding user response:

Sometimes to confirm this small mistake easily