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Added workaround for 6551 UART.

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Oliver Schmidt 2019-05-06 17:47:02 +02:00
parent 81724c8855
commit 5499e53880
1 changed files with 7 additions and 1 deletions
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8
cpu/6502/net/slip_arch.c
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@ -69,7 +69,13 @@ void
slip_arch_writeb(unsigned char c)
{
while(ser_put(c) == SER_ERR_OVERFLOW)
;
/* The 6551 doesn't allow to send while receive(!) flow control is set.
* This behavior can easily result in a dead-lock right here. Therefore
* we need to empty the low level input buffer in order to have receive
* flow control cleared - even if this results in the high level input
* buffer 'rxbuf' to overflow and thus a SLIP packet to be discarded.
*/
slip_arch_poll();
}
/*---------------------------------------------------------------------------*/
void