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74 lines
2.0 KiB
74 lines
2.0 KiB
/* ttyhandle_out.c - ttyhandle_out */ |
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#include <xinu.h> |
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/*------------------------------------------------------------------------ |
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* ttyhandle_out - Handle an output on a tty device by sending more |
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* characters to the device FIFO (interrupts disabled) |
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*------------------------------------------------------------------------ |
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*/ |
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void ttyhandle_out( |
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struct ttycblk *typtr, /* Ptr to ttytab entry */ |
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struct uart_csreg *csrptr /* Address of UART's CSRs */ |
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) |
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{ |
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int32 ochars; /* Number of output chars sent */ |
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/* to the UART */ |
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int32 avail; /* Available chars in output buf*/ |
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int32 uspace; /* Space left in onboard UART */ |
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/* output FIFO */ |
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/* If output is currently held, simply ignore the call */ |
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if (typtr->tyoheld) { |
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return; |
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} |
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/* If echo and output queues empty, turn off interrupts */ |
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if ( (typtr->tyehead == typtr->tyetail) && |
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(semcount(typtr->tyosem) >= TY_OBUFLEN) ) { |
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return; |
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} |
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/* Initialize uspace to the available space in the Tx FIFO */ |
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/* avr specific: just one byte of fifo so far */ |
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uspace = UART_FIFO_SIZE; |
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/* While onboard FIFO is not full and the echo queue is */ |
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/* nonempty, xmit chars from the echo queue */ |
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while ( (uspace>0) && typtr->tyehead != typtr->tyetail) { |
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serial_put_char(*typtr->tyohead++); /* send chars using uart */ |
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if (typtr->tyehead >= &typtr->tyebuff[TY_EBUFLEN]) { |
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typtr->tyehead = typtr->tyebuff; |
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} |
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uspace--; |
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} |
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/* While onboard FIFO is not full and the output queue is */ |
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/* nonempty, transmit chars from the output queue */ |
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ochars = 0; |
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avail = TY_OBUFLEN - semcount(typtr->tyosem); |
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while ( (uspace>0) && (avail > 0) ) { |
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serial_put_char(*typtr->tyohead++); /* send chars using uart */ |
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if (typtr->tyohead >= &typtr->tyobuff[TY_OBUFLEN]) { |
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typtr->tyohead = typtr->tyobuff; |
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} |
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avail--; |
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uspace--; |
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ochars++; |
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} |
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if (ochars > 0) { |
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signaln(typtr->tyosem, ochars); |
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} |
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if ( (typtr->tyehead == typtr->tyetail) && |
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(semcount(typtr->tyosem) >= TY_OBUFLEN) ) { |
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/* deshabilitar interrupcines de transmición */ |
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} |
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return; |
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}
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