stm8l051f3p6串口发送失败

只看该作者 · 2021-1-5 09:48

想通过串口tx打印调试信息，但是始终调不通，没用中断，没用rx。示波器观察PA2始终高电平。

代码如下：

void SysClkInit(void)
{
CLK_CKDIVR_bit.CKM = 3;
CLK_ICKCR_bit.HSION = 1;
CLK_SWR = 1;

CLK_PCKENR1_bit.PCKEN15 = 1;    //USART1
CLK_PCKENR1_bit.PCKEN10 = 1;    //TIM2

CLK_PCKENR2_bit.PCKEN27 = 1;       //Boot ROM
CLK_PCKENR2_bit.PCKEN20 = 1;       //ADC1
}

void SysUSART1Init(void)
{
SYSCFG_RMPCR1_bit.USART1TR_REMAP = 1;    //USART1_TX on PA2 and USART1_RX on PA3
PA_DDR_DDR2 = 1;          //output
PA_ODR_ODR2 = 1;          //data
PA_CR1_C12 = 1;          //push pull
PA_CR2_C22 = 1;          //10M

USART1_CR1_bit.M = 0;    //1 start bit, 8 data bits, n stop bit
USART1_CR3_bit.STOP0 = 0;
USART1_CR3_bit.STOP1 = 0; //1 stop bit
USART1_CR1_bit.PCEN = 0; //parity disable
USART1_BRR2 = 0x00;       //9600
USART1_BRR1 = 0x0D;

USART1_CR2_bit.TEN = 1;    //transmitter enable
USART1_CR1_bit.USARTD = 0;  //usart enable
}

void UsartTxAByte(unsigned char ucData)
{
USART1_DR = ucData;
while (0 == USART1_SR_bit.TXE);
}
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