整个系统的工作模式是做一个通信中转，将一个串口接收到的数据从另一个串口发送出去。
现遇到以下问题：单向的时候，即一个串口收，一个串口发时还是比较稳定地
当工作在全双工时，时间一长就会出问题，其中一个串口会接收不到数据
请问：中断处理上，和初始化上有什么需要注意的？
两个串口的程序差不多，
*/
/*
* 初始串口0
*/
void Usart0_init(void)
{
extern AT91S_PIO * pPIO ;
unsigned long statu;
Com0RecBLengA = 0 ;
Com0RecBLengB = 0 ;
Com0RecOK = 0 ;
/* Disable all interrupt */
pPIO->PIO_ASR = AT91C_PA5_RXD0|AT91C_PA6_TXD0; /* set rxd txd pin contral by pers A */
pPIO->PIO_BSR = 0 ;
pPIO->PIO_PDR = AT91C_PA5_RXD0|AT91C_PA6_TXD0; /* Disable RXD and TXD pin controler by PIO */
AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_US0); /* enable the clock of the PIOA */
AT91C_BASE_US0->US_IDR = 0xf3fff;
/* reset receive and transmitter, disable receive and transmitter */
AT91C_BASE_US0->US_CR = AT91C_US_RSTRX|AT91C_US_RSTTX|AT91C_US_RXDIS|AT91C_US_TXDIS ;
AT91C_BASE_US0->US_RCR = 0 ; /* clear receive counter */
AT91C_BASE_US0->US_TCR = 0 ; /* clear transmit counter */
AT91C_BASE_US0->US_BRGR = AT91F_US_Baudrate(SYS_MCK, 57600) ; /* Define the baud rate divisor register */
/* Define the USART mode SYNC = 0 OVER = 0 baud = mck/div/16/BRGR */
AT91C_BASE_US0->US_MR = AT91C_US_USMODE_NORMAL /* normal */
|AT91C_US_CLKS_CLOCK /* mck/div */
|AT91C_US_CHRL_8_BITS /* 8 bit */
|AT91C_US_PAR_EVEN /* EVEN 奇检验 */
|AT91C_US_NBSTOP_1_BIT ; /* one stop bit */
AT91C_BASE_US0->US_TTGR = 0 ; /* Write the Timeguard Register */
//* Enable receiver and transmitter
AT91C_BASE_US0->US_CR = AT91C_US_RXEN | AT91C_US_TXEN ;
AT91C_BASE_US0->US_RTOR= 0 ;
AT91C_BASE_US0->US_PTCR = AT91C_PDC_RXTDIS ;
AT91C_BASE_US0->US_PTCR = AT91C_PDC_TXTDIS ;
AT91C_BASE_US0->US_TNPR = 0 ;
AT91C_BASE_US0->US_TNCR = 0 ;
AT91C_BASE_US0->US_RNPR = 0 ;
AT91C_BASE_US0->US_RNCR = 0 ;
AT91C_BASE_US0->US_TPR = 0 ;
AT91C_BASE_US0->US_TCR = 0 ;
AT91C_BASE_US0->US_RPR = (unsigned int)Com0RecBufA ;
Com0RecBufDex = 0 ;
AT91C_BASE_US0->US_RCR = COM0_REC_BUFFER_LENGTH ;
AT91C_BASE_US0->US_RTOR = 10 ;
AT91C_BASE_US0->US_PTCR = AT91C_PDC_RXTEN ;
AT91C_BASE_US0->US_PTCR = AT91C_PDC_TXTEN ;
/* USART IRQ open */
/* Global UART Interrupt: Mode and Vector with Highest Priority and Enable */
AT91C_BASE_AIC->AIC_IDCR = (1 << AT91C_ID_US0); // enable interrupt
AT91C_BASE_AIC->AIC_SMR[AT91C_ID_US0] = AT91C_AIC_SRCTYPE_INT_EDGE_TRIGGERED |
AT91C_AIC_PRIOR_HIGHEST;
AT91C_BASE_AIC->AIC_SVR[AT91C_ID_US0] = (unsigned long) USART0_ISR;
AT91C_BASE_AIC->AIC_IECR = (1 << AT91C_ID_US0); // enable interrupt
AT91C_BASE_AIC->AIC_ICCR = (1 << AT91C_ID_US0); // clear interrupt
statu = AT91C_BASE_AIC->AIC_IMR ;
statu = AT91C_BASE_AIC->AIC_IPR ;
AT91C_BASE_US0->US_IER=AT91C_US_TIMEOUT|AT91C_US_RXBUFF;
statu = AT91C_BASE_US0->US_IMR;
}
int Usart0_send_frame (unsigned char * pbuffer, short bufsize )
{
while((pUART0->US_CSR & US_ENDTX ) == 0) ; /* Wait for previous transfer finished */
pUART0->US_TPR = (unsigned int)pbuffer ; /* Store the address of the buffer */
pUART0->US_TCR = bufsize ;
return TRUE ;
}
void USART0_Handler(void)
{
unsigned long statu,length;
// *AT91C_AIC_EOICR = 0; /* End of Interrupt */
statu = pUART0->US_CSR ; /* get the channel status */
length = pUART0->US_RCR ;
if ( statu & (AT91C_US_TIMEOUT|AT91C_US_RXBUFF))
{
if(Com0RecBufDex == 0)
{
Com0RecBufDex = 1;
pUART0->US_RPR = (unsigned int) Com0RecBufB;
pUART0->US_RCR = COM0_REC_BUFFER_LENGTH;
Com0RecBLengA = COM0_REC_BUFFER_LENGTH - length ;
Com0RecOK = 1 ;
}
else
{
Com0RecBufDex = 0;
pUART0->US_RPR = (unsigned int) Com0RecBufA;
pUART0->US_RCR = COM0_REC_BUFFER_LENGTH;
Com0RecBLengB = COM0_REC_BUFFER_LENGTH - length ;
Com0RecOK = 1 ;
}
pUART0->US_CR = AT91C_US_STTTO;
}
pUART0->US_CR = AT91C_US_RSTSTA;
}
USART0_ISR
sub r14, r14, #4
stmfd sp!, {r14}
mrs r14, spsr
stmfd sp!, {r0,r14}
mrs r14, cpsr
bic r14, r14, #I_Bit
orr r14, r14, #Mode_SVC
msr cpsr_cxsf, r14
stmfd sp!, { r0-r12, r14}
bl USART0_Handler
ldmia sp!, { r0-r12, r14}
mrs r0, cpsr
bic r0, r0, #Mode_SVC
orr r0, r0, #I_Bit:OR:Mode_IRQ
msr cpsr_cxsf, r0
ldr r0, =AIC_BASE
str r0, [r0, #AIC_EOICR]
ldmia sp!, {r0,r14}
msr spsr_cxsf, r14
ldmia sp!, {pc}^ |
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