Toyomasa Watarai / mbed-src

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Diff: targets/hal/TARGET_NXP/TARGET_LPC176X/serial_api.c

Revision:
40:5fa4b7c54c1d
Parent:
20:4263a77256ae
Child:
51:7838415c99e7
--- a/targets/hal/TARGET_NXP/TARGET_LPC176X/serial_api.c	Fri Oct 25 13:30:04 2013 +0100
+++ b/targets/hal/TARGET_NXP/TARGET_LPC176X/serial_api.c	Fri Oct 25 13:45:04 2013 +0100
@@ -106,6 +106,7 @@
         case UART_2: obj->index = 2; break;
         case UART_3: obj->index = 3; break;
     }
+    obj->count = 0;
     
     is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);
     
@@ -283,6 +284,7 @@
 void serial_putc(serial_t *obj, int c) {
     while (!serial_writable(obj));
     obj->uart->THR = c;
+    obj->count++;
 }
 
 int serial_readable(serial_t *obj) {
@@ -290,7 +292,13 @@
 }
 
 int serial_writable(serial_t *obj) {
-    return obj->uart->LSR & 0x20;
+    int isWritable = 1;
+    if (obj->uart->LSR & 0x20)
+        obj->count = 0;
+    else if (obj->count >= 16)
+        isWritable = 0;
+        
+    return isWritable;
 }
 
 void serial_clear(serial_t *obj) {