Adjusted the minimum Turnaround time for ARM and AVR ports to give a minimum since there are errors induced from the clock and from rounding.

2007-08-20 19:39:36 +00:00
parent 1d46e28189
commit 03dfa101c9
3 changed files with 9 additions and 11 deletions
@@ -123,11 +123,9 @@ void RS485_Send_Frame(

    /* delay after reception - per MS/TP spec */
    if (mstp_port) {
-        /* wait about 40 bit times since reception */
-        turnaround_time = (Tturnaround*1000UL)/RS485_Baud;
-        if (!turnaround_time) {
-            turnaround_time = 1;
-        }
+        /* wait a minimum  40 bit times since reception */
+        /* at least 1 ms for errors: rounding, clock tick */
+        turnaround_time = 1 + ((Tturnaround*1000UL)/RS485_Baud);
        while (mstp_port->SilenceTimer() < turnaround_time) {
            /* do nothing - wait for timer to increment */
        };