GD32芯片的USART1初始化代码（转载）

1万 · 2018-10-26 15:39

void usart_init(void)
{
/* Enable USART2 APB clock */
RCC_APB2PeriphClock_Enable(RCC_APB2PERIPH_USART1, ENABLE);
/* USART1 Pins configuration **************************************************/
{
/* Configure the GPIO ports */
GPIO_InitPara  GPIO_InitStructure;

/* Connect pin to Periph */
GPIO_PinAFConfig(GPIOA , GPIO_PINSOURCE9, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA , GPIO_PINSOURCE10, GPIO_AF_1);

/* Configure pins as AF pushpull */
GPIO_InitStructure.GPIO_Pin    = GPIO_PIN_9 | GPIO_PIN_10;
GPIO_InitStructure.GPIO_Mode = GPIO_MODE_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_SPEED_50MHZ;
GPIO_InitStructure.GPIO_OType = GPIO_OTYPE_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PUPD_NOPULL;
GPIO_Init(GPIOA , &GPIO_InitStructure);
} //GPIO setting

{
USART_InitPara  USART_InitStructure;

USART_DeInit(USART1);
USART_InitStructure.USART_BRR =9600;
USART_InitStructure.USART_WL                = USART_WL_8B;
USART_InitStructure.USART_STBits             = USART_STBITS_1;
USART_InitStructure.USART_Parity             = USART_PARITY_RESET;
USART_InitStructure.USART_HardwareFlowControl = USART_HARDWAREFLOWCONTROL_NONE;
USART_InitStructure.USART_RxorTx             = USART_RXORTX_RX | USART_RXORTX_TX;
USART_Init(USART1, &USART_InitStructure);
}
{
NVIC_InitPara  NVIC_InitStructure;

/* Configure the NVIC Preemption Priority Bits */
/* Configure the preemption priority and subpriority:
   - 1 bits for pre-emption priority: possible value are 0 or 1
   - 3 bits for subpriority: possible value are 0..7
   - Lower values gives higher priority
   */

/* Re-configure and enable USART interrupt to have the higher priority */
NVIC_InitStructure.NVIC_IRQ = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQPreemptPriority = 5;
NVIC_InitStructure.NVIC_IRQSubPriority = 1;
NVIC_InitStructure.NVIC_IRQEnable = ENABLE;
NVIC_Init(&NVIC_InitStructure);
} //NVIC  usart2 setting
/* Enable the USART1 Receive interrupt */
USART_INT_Set(USART1, USART_INT_RBNE, ENABLE);
/* USART enable */
USART_Enable(USART1, ENABLE);

}

1万 · 2018-10-26 15:39

//发送单字节
void usart_transmit( unsigned char data )
{
USART_ClearBitState (USART1,USART_FLAG_TC);
USART_DataSend(USART1,data);
while(USART_GetBitState(USART1,USART_FLAG_TC)==RESET);
USART_ClearBitState (USART1,USART_FLAG_TC);
}

1万 · 2018-10-26 15:39

//发送字符串
void usart_send_string(char *str)
{
while(*str)
{
usart_transmit(*str) ;
str++;
}
}

只看该作者 · 2018-10-30 12:05

void usart_init(void) { /* Enable USART2 APB clock */ RCC_APB2PeriphClock_Enable(RCC_APB2PERIPH_USART1, ENABLE); /* USART1 Pins configuration

1万 · 2018-11-5 17:19

请问这个有什么问题吗