我没下载451的例子，但是我看051做的挺好的啊
/****************************************************************************
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V1.00
* $Revision: 10 $
* $Date: 15/05/22 2:52p $
* [url=home.php?mod=space&uid=247401]@brief[/url] Transmit and receive data with auto flow control.
* This sample code needs to work with UART_Autoflow_Master.
*
* @note
* Copyright (C) 2011 Nuvoton Technology Corp. All rights reserved.
*
******************************************************************************/
#include <stdio.h>
#include "M051Series.h"
#define PLL_CLOCK 50000000
#define RXBUFSIZE 1024
/*---------------------------------------------------------------------------------------------------------*/
/* Global variables */
/*---------------------------------------------------------------------------------------------------------*/
uint8_t g_u8SendData[12] = {0};
uint8_t g_u8RecData[RXBUFSIZE] = {0};
volatile int32_t g_i32pointer = 0;
/*---------------------------------------------------------------------------------------------------------*/
/* Define functions prototype */
/*---------------------------------------------------------------------------------------------------------*/
extern char GetChar(void);
int32_t main(void);
void AutoFlow_FunctionRxTest(void);
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable Internal RC 22.1184MHz clock */
CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
/* Waiting for Internal RC clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
/* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));
/* Enable external XTAL 12MHz clock */
CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);
/* Waiting for external XTAL clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);
/* Set core clock as PLL_CLOCK from PLL */
CLK_SetCoreClock(PLL_CLOCK);
/* Enable UART module clock */
CLK_EnableModuleClock(UART0_MODULE);
CLK_EnableModuleClock(UART1_MODULE);
/* Select UART module clock source */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
CLK_SetModuleClock(UART1_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P3 multi-function pins for UART0 RXD and TXD */
SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk);
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_Msk | SYS_MFP_P13_Msk);
SYS->P1_MFP |= (SYS_MFP_P12_RXD1 | SYS_MFP_P13_TXD1);
/* Set P0 multi-function pins for UART1 RTS */
SYS->P0_MFP = SYS->P0_MFP & (~SYS_MFP_P01_Msk) | SYS_MFP_P01_RTS1;
}
void UART0_Init()
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset UART0 */
SYS_ResetModule(UART0_RST);
/* Configure UART0 and set UART0 Baudrate */
UART_Open(UART0, 115200);
}
void UART1_Init()
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset UART1 */
SYS_ResetModule(UART1_RST);
/* Configure UART1 and set UART1 Baudrate */
UART_Open(UART1, 115200);
}
/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function */
/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/* Init System, peripheral clock and multi-function I/O */
SYS_Init();
/* Lock protected registers */
SYS_LockReg();
/* Init UART0 for printf */
UART0_Init();
/* Init UART1 for testing */
UART1_Init();
/*---------------------------------------------------------------------------------------------------------*/
/* SAMPLE CODE */
/*---------------------------------------------------------------------------------------------------------*/
printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %dHz\n", SystemCoreClock);
printf("\n\nUART Sample Program\n");
/* UART auto flow sample slave function */
AutoFlow_FunctionRxTest();
while(1);
}
/*---------------------------------------------------------------------------------------------------------*/
/* ISR to handle UART Channel 1 interrupt event */
/*---------------------------------------------------------------------------------------------------------*/
void UART1_IRQHandler(void)
{
volatile uint32_t u32IntSts = UART1->ISR;;
/* Rx Ready or Time-out INT */
if(UART_GET_INT_FLAG(UART1, UART_ISR_RDA_INT_Msk) || UART_GET_INT_FLAG(UART1, UART_ISR_TOUT_INT_Msk))
{
/* Handle received data */
g_u8RecData[g_i32pointer] = UART_READ(UART1);
g_i32pointer++;
}
}
/*---------------------------------------------------------------------------------------------------------*/
/* AutoFlow Function Test (Slave) */
/*---------------------------------------------------------------------------------------------------------*/
void AutoFlow_FunctionRxTest()
{
uint32_t u32i;
printf("\n");
printf("+-----------------------------------------------------------+\n");
printf("| Pin Configure |\n");
printf("+-----------------------------------------------------------+\n");
printf("| _______ _______ |\n");
printf("| | | | | |\n");
printf("| |Master |---TXD1(P1.3) <====> RXD1(P1.2)---| Slave | |\n");
printf("| | |---CTS1(P0.0) <====> RTS1(P0.1)---| | |\n");
printf("| |_______| |_______| |\n");
printf("| |\n");
printf("+-----------------------------------------------------------+\n");
printf("\n");
printf("+-----------------------------------------------------------+\n");
printf("| AutoFlow Function Test (Slave) |\n");
printf("+-----------------------------------------------------------+\n");
printf("| Description : |\n");
printf("| The sample code needs two boards. One is Master and |\n");
printf("| the other is slave. Master will send 1k bytes data |\n");
printf("| to slave.Slave will check if received data is correct |\n");
printf("| after getting 1k bytes data. |\n");
printf("| Press any key to start... |\n");
printf("+-----------------------------------------------------------+\n");
GetChar();
/* Enable RTS and CTS autoflow control */
UART_EnableFlowCtrl(UART1);
/* Set RTS Trigger Level as 8 bytes */
UART1->FCR &= ~UART_FCR_RTS_TRI_LEV_Msk;
UART1->FCR |= UART_FCR_RTS_TRI_LEV_8BYTES;
/* Enable RDA\RLS\RTO Interrupt */
UART_ENABLE_INT(UART1, (UART_IER_RDA_IEN_Msk | UART_IER_RLS_IEN_Msk | UART_IER_RTO_IEN_Msk));
/* Set RX Trigger Level as 8 bytes */
UART1->FCR &= ~UART_FCR_RFITL_Msk;
UART1->FCR |= UART_FCR_RFITL_8BYTES;
/* Set Timeout time 0x3E bit-time and time-out counter enable */
UART_SetTimeoutCnt(UART1, 0x3E);
/* Enable UART1 IRQ */
NVIC_EnableIRQ(UART1_IRQn);
printf("\n Starting to receive data...\n");
/* Wait for receive 1k bytes data */
while(g_i32pointer < RXBUFSIZE);
/* Compare Data */
for(u32i = 0; u32i < RXBUFSIZE; u32i++)
{
if(g_u8RecData[u32i] != (u32i & 0xFF))
{
printf("Compare Data Failed\n");
while(1);
}
}
printf("\n Receive OK & Check OK\n");
/* Disable UART1 IRQ */
NVIC_DisableIRQ(UART1_IRQn);
/* Disable RDA\RLS\RTO Interrupt */
UART_DISABLE_INT(UART1, (UART_IER_RDA_IEN_Msk | UART_IER_RLS_IEN_Msk | UART_IER_RTO_IEN_Msk));
}
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