您好：
使用C6748_StarterWare例程中的examples\lcdkC6748\uart中的例程稍作如下修改：
1、屏蔽了串口中断函数中的"length--;和count++;"语句；
2、将uart2修改为uart0；
3、以1S一次的速率通过计算机每次给串口发送7个字符abcdefg；
4、几分钟后串口无响应，再也不能发送和接收，串口中断无响应；
请教，这是怎么造成的，是什么原因呢？
代码如下，附件中也有代码：
#include "hw_psc_C6748.h"
#include "soc_C6748.h"
#include "interrupt.h"
#include "lcdkC6748.h"
#include "hw_types.h"
#include "uart.h"
#include "psc.h"
/****************************************************************************/
/* LOCAL FUNCTION PROTOTYPES */
/****************************************************************************/
static void ConfigureIntUART(void);
static void SetupInt(void);
static void UARTIsr(void);
/****************************************************************************/
/* GLOBAL VARIABLES */
/****************************************************************************/
char txArray[] = "StarterWare UART echo application\n\r";
/****************************************************************************/
/* LOCAL FUNCTION DEFINITIONS */
/****************************************************************************/
int main(void)
{
unsigned int intFlags = 0;
unsigned int config = 0;
/* Enabling the PSC for UART0.*/
PSCModuleControl(SOC_PSC_0_REGS, HW_PSC_UART0, PSC_POWERDOMAIN_ALWAYS_ON,
PSC_MDCTL_NEXT_ENABLE);
/* Setup PINMUX */
UARTPinMuxSetup(0, FALSE);
/* Enabling the transmitter and receiver*/
UARTEnable(SOC_UART_0_REGS);
/* 1 stopbit, 8-bit character, no parity */
config = UART_WORDL_8BITS;
/* Configuring the UART parameters*/
UARTConfigSetExpClk(SOC_UART_0_REGS, SOC_UART_0_MODULE_FREQ,
BAUD_115200, config,
UART_OVER_SAMP_RATE_16);
/* Enabling the FIFO and flushing the Tx and Rx FIFOs.*/
UARTFIFOEnable(SOC_UART_0_REGS);
/* Setting the UART Receiver Trigger Level*/
UARTFIFOLevelSet(SOC_UART_0_REGS, UART_RX_TRIG_LEVEL_1);
/*
** Enable AINTC to handle interrupts. Also enable IRQ interrupt in ARM
** processor.
*/
SetupInt();
/* Configure AINTC to receive and handle UART interrupts. */
ConfigureIntUART();
/* Preparing the 'intFlags' variable to be passed as an argument.*/
intFlags |= (UART_INT_LINE_STAT | \
UART_INT_TX_EMPTY | \
UART_INT_RXDATA_CTI);
/* Enable the Interrupts in UART.*/
UARTIntEnable(SOC_UART_0_REGS, intFlags);
while(1);
}
/*
** \brief Interrupt Service Routine(ISR) to be executed on UART interrupts.
** Depending on the source of interrupt, this
** 1> writes to the serial communication console, or
** 2> reads from the serial communication console, or
** 3> reads the byte in RBR if receiver line error has occured.
*/
static void UARTIsr()
{
static unsigned int length = sizeof(txArray);
static unsigned int count = 0;
unsigned char rxData = 0;
unsigned int int_id = 0;
/* This determines the cause of UART0 interrupt.*/
int_id = UARTIntStatus(SOC_UART_0_REGS);
#ifdef _TMS320C6X
// Clear UART0 system interrupt in DSPINTC
IntEventClear(SYS_INT_UART0_INT);
#else
/* Clears the system interupt status of UART0 in AINTC. */
IntSystemStatusClear(SYS_INT_UARTINT0);
#endif
/* Checked if the cause is transmitter empty condition.*/
if(UART_INTID_TX_EMPTY == int_id)
{
if(0 < length)
{
/* Write a byte into the THR if THR is free. */
UARTCharPutNonBlocking(SOC_UART_0_REGS, txArray[count]);
// length--;
// count++;
}
if(0 == length)
{
/* Disable the Transmitter interrupt in UART.*/
UARTIntDisable(SOC_UART_0_REGS, UART_INT_TX_EMPTY);
}
}
/* Check if the cause is receiver data condition.*/
if(UART_INTID_RX_DATA == int_id)
{
rxData = UARTCharGetNonBlocking(SOC_UART_0_REGS);
// UARTCharPutNonBlocking(SOC_UART_0_REGS, rxData);
}
/* Check if the cause is receiver line error condition.*/
if(UART_INTID_RX_LINE_STAT == int_id)
{
while(UARTRxErrorGet(SOC_UART_0_REGS))
{
/* Read a byte from the RBR if RBR has data.*/
UARTCharGetNonBlocking(SOC_UART_0_REGS);
}
}
return;
}
/*
** \brief This function invokes necessary functions to configure the ARM
** processor and ARM Interrupt Controller(AINTC) to receive and
** handle interrupts.
*/
static void SetupInt(void)
{
#ifdef _TMS320C6X
// Initialize the DSP INTC
IntDSPINTCInit();
// Enable DSP interrupts globally
IntGlobalEnable();
#else
/* Initialize the ARM Interrupt Controller(AINTC). */
IntAINTCInit();
/* Enable IRQ in CPSR.*/
IntMasterIRQEnable();
/* Enable the interrupts in GER of AINTC.*/
IntGlobalEnable();
/* Enable the interrupts in HIER of AINTC.*/
IntIRQEnable();
#endif
}
/*
** \brief This function confiugres the AINTC to receive UART interrupts.
*/
static void ConfigureIntUART(void)
{
#ifdef _TMS320C6X
IntRegister(C674X_MASK_INT4, UARTIsr);
IntEventMap(C674X_MASK_INT4, SYS_INT_UART0_INT);
IntEnable(C674X_MASK_INT4);
#else
/* Registers the UARTIsr in the Interrupt Vector Table of AINTC. */
IntRegister(SYS_INT_UARTINT0, UARTIsr);
/* Map the channel number 2 of AINTC to UART0 system interrupt. */
IntChannelSet(SYS_INT_UARTINT0, 2);
IntSystemEnable(SYS_INT_UARTINT0);
#endif
}
