intx uart_read( TiUartAdapter * uart, char * buf, intx size, uint8 opt )
{
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
intx copied=0;
int8 count =0;
hal_enter_critical();
copied = min( uart->rxlen, size );
if (copied > 0)
{
memmove( (void *)buf, (void *)&(uart->rxbuf[0]), copied );
uart->rxlen -= copied;
if (uart->rxlen > 0)
memmove( (void *)&(uart->rxbuf[0]), (void *)&(uart->rxbuf[copied]), uart->rxlen );
}
hal_leave_critical();
return copied;
#endif
#ifndef CONFIG_UART_INTERRUPT_DRIVEN
intx ret=0;
if (size > 0)
{
ret = uart_getchar( uart, buf );
}
return ret;
#endif
}
//This writes up to nbytes bytes to the FIFO
//If the head runs in to the tail, not all bytes are written
//The number of bytes written is returned
int fifo_write(fifo_t * f, const void * buf, int nbytes)
{
int i;
const char * p;
p = buf;
hal_enter_critical();
for (i = 0; i < nbytes; i++) {
//first check to see if there is space in the buffer
if ( (f->head + 1 == f->tail) ||
( (f->head + 1 == f->size) && (f->tail == 0) ) )
return i; //no more room
else {
f->buf[f->head] = *p++;
f->head++; //increment the head
if ( f->head == f->size ) //check for wrap-around
f->head = 0;
}
}
hal_exit_critical();
return nbytes;
}
void uart_close( TiUartAdapter * uart )
{
// todo:
// you should disable interrutps here
//
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
uart->rxlen = 0;
uart->txlen = 0;
switch (uart->id)
{
case 0:
//hal_detachhandler( INTNUM_USART1_RX );
//hal_detachhandler( INTNUM_USART1_UDRE );
break;
case 1:
//hal_detachhandler( INTNUM_USART1_RX );
//hal_detachhandler( INTNUM_USART1_UDRE );
};
#endif
}
/*******************************************************************************
* this function is hardware related
* you should change the register in this function
*
* attention: this function will return immediately. it will not wait for the
* incoming data. if there's no arrival data pending in the USART's register,
* this function will simply return -1.
*
* @return
* 0 success, *ch is char just read from UART
* -1 failed. The value of -1 means the uart object doesn't exists.
******************************************************************************/
intx uart_getchar( TiUartAdapter * uart, char * pc )
{
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
intx ret = -1;
hal_enter_critical();
if (uart->rxlen > 0)
{
*pc = uart->rxbuf[0];
uart->rxlen --;
memmove( (void *)&(uart->rxbuf[0]), (void *)&(uart->rxbuf[1]), uart->rxlen );
ret = 0;
}
hal_leave_critical();
return ret;
#endif
#ifndef CONFIG_UART_INTERRUPT_DRIVEN
int8 ret=0;
char c;
BYTE status;
switch (uart->id)
{
case 0:
// Turning on reception
status = U0CSR;
U0CSR |= UART_ENABLE_RECEIVE;
while (!URX0IF );
c = U0DBUF;
URX0IF = FALSE;
// Restoring old state
U0CSR = status;
*pc = c;
ret = 0;
break;
case 1:
break;
case 2:
break;
default:
ret = -1;
}
return ret;
#endif
}