jim herd / FPGA_bus

Comms between MAX 10 FPGA and ST uP

Diff: FPGA_bus.h

Revision:
21:6b2b7a0e2d9a
Parent:
20:aacf2ebd93ff
Child:
22:c47d4177d59c
--- a/FPGA_bus.h	Mon Jun 15 21:29:40 2020 +0000
+++ b/FPGA_bus.h	Tue Jun 16 23:06:04 2020 +0000
@@ -76,14 +76,14 @@
 
 #define     nS_IN_uS                1000
 #define     FPGA_CLOCK_PERIOD_nS      20
-#define     NOS_BUS_CHECKS             3  // number of times to test bus
-#define     BUS_TEST_TIMEOUT        1000  // loop counts for timeout test
+#define     uS_DELAY_BEFORE_TEST_HANDSHAKE      25
 
 //////////////////////////////////////////////////////////////////////////
 // error codes
 
-#define     NO_ERROR     0
-#define     BUS_FAIL   -30
+#define     NO_ERROR      0
+#define     BUS_FAIL_1  -30     // handshake_2 initially HIGH but should be LOW
+#define     BUS_FAIL_2  -31     // handshake_2 not transitioned to HIGH
 
 //////////////////////////////////////////////////////////////////////////
 // typedef structures