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properly drop characters when buffer is full

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fix by David Kopf
This commit is contained in:
Mariano Alvira 2010-07-06 09:34:23 -04:00
parent beb75cd355
commit 7e5ebe88f7
1 changed files with 3 additions and 2 deletions
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5
lib/uart1.c
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@ -65,8 +65,9 @@ void uart1_putc(char c) {
u1_head += 1; u1_head += 1;
if (u1_head >= sizeof(u1_tx_buf)) if (u1_head >= sizeof(u1_tx_buf))
u1_head = 0; u1_head = 0;
if (u1_head == u1_tail) /* drop chars when no room */ if (u1_head == u1_tail) { /* drop chars when no room */
return; if (u1_head) { u1_head -=1; } else { u1_head = sizeof(u1_tx_buf); }
}
enable_irq(UART1); enable_irq(UART1);
} }
} }