附上程序，程序也是我根据例程改的
#include <stdio.h>
#include "M051Series.h"
#define PLLCON_SETTING SYSCLK_PLLCON_50MHz_XTAL
#define PLL_CLOCK 50000000
/*---------------------------------------------------------------------------------------------------------*/
/* Define functions prototype */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void);
void Delay(int32_t time)
{
while(time--)
{
;
}
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Unlock protected registers */
SYS_UnlockReg();
/* Enable external 12MHz XTAL */
SYSCLK->PWRCON |= SYSCLK_PWRCON_XTL12M_EN_Msk;
SYSCLK->PLLCON = PLLCON_SETTING;
/* Waiting for clock ready */
SYS_WaitingForClockReady(SYSCLK_CLKSTATUS_PLL_STB_Msk | SYSCLK_CLKSTATUS_XTL12M_STB_Msk);
/* Switch HCLK clock source to PLL */
SYSCLK->CLKSEL0 = SYSCLK_CLKSEL0_HCLK_PLL;
/* Enable IP clock */
SYSCLK->APBCLK = SYSCLK_APBCLK_UART0_EN_Msk | SYSCLK_APBCLK_UART1_EN_Msk;
/* IP clock source */
SYSCLK->CLKSEL1 = SYSCLK_CLKSEL1_UART_PLL ;
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
//SystemCoreClockUpdate();
PllClock = PLL_CLOCK; // PLL
SystemCoreClock = PLL_CLOCK / 1; // HCLK
CyclesPerUs = PLL_CLOCK / 1000000; // For SYS_SysTickDelay()
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P3 multi-function pins for UART0 RXD and TXD */
SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0;
/* Set P1 multi-function pins for UART1 RXD and TXD */
SYS->P1_MFP = SYS_MFP_P12_RXD1 | SYS_MFP_P13_TXD1;
/* Set P0 multi-function pins for UART1 RTS and CTS */
SYS->P0_MFP = SYS_MFP_P01_RTS1 | SYS_MFP_P00_CTS1;
/* Lock protected registers */
SYS_LockReg();
}
void UART0_Init()
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
UART0->BAUD = UART_BAUD_MODE2 | UART_BAUD_DIV_MODE2(PLL_CLOCK,115200);
_UART_SET_DATA_FORMAT(UART0, UART_WORD_LEN_8 | UART_PARITY_NONE | UART_STOP_BIT_1);
}
/*---------------------------------------------------------------------------------------------------------*/
/* UART Test Sample */
/* Test Item */
/* It sends the received data to HyperTerminal. */
/*---------------------------------------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function */
/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
/* Init System, IP clock and multi-function I/O */
SYS_Init();
/* Init UART0 for printf */
UART0_Init();
/* Init UART1 for testing */
/*---------------------------------------------------------------------------------------------------------*/
/* SAMPLE CODE */
/*---------------------------------------------------------------------------------------------------------*/
// _UART_ENABLE_INT(UART0, (UART_IER_RDA_IEN_Msk | UART_IER_THRE_IEN_Msk | UART_IER_RTO_IEN_Msk));
_UART_ENABLE_INT(UART0, UART_IER_RDA_IEN_Msk);
NVIC_EnableIRQ(UART0_IRQn);
while(1)
{
;
}
}
/*---------------------------------------------------------------------------------------------------------*/
/* ISR to handle UART Channel 0 interrupt event */
/*---------------------------------------------------------------------------------------------------------*/
void UART0_IRQHandler(void)
{
uint8_t u8InChar=0xFF;
uint32_t u32IntSts= UART0->ISR;
if(u32IntSts & UART_ISR_RDA_INT_Msk)
{
/* Get all the input characters */
while(_UART_IS_RX_READY(UART0))
{
while(_UART_IS_RX_FULL(UART0))
{
;
}
/* Get the character from UART Buffer */
_UART_RECEIVEBYTE(UART0,u8InChar); /* Rx trigger level is 1 byte*/
_UART_SENDBYTE(UART0,u8InChar);
_UART_WAIT_TX_EMPTY(UART0);
}
}
}
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