X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=blobdiff_plain;f=firmware%2Fmodbus.h;h=3a3fcdf28e6fed2db6f6e929049b68b33d64a8ee;hb=ea6d804fc60dc33181c8c771de9093053ed9be33;hp=4218317c54f627dae421c996f57e04b4c73d2cc1;hpb=86f8e5bfd1c753034b9ca876dac7d18720ab8808;p=openparking.git

diff --git a/firmware/modbus.h b/firmware/modbus.h
old mode 100755
new mode 100644
index 4218317..3a3fcdf
--- a/firmware/modbus.h
+++ b/firmware/modbus.h
@@ -8,7 +8,31 @@
  * All bugs by Jan "Yenya" Kasprzak <kas@fi.muni.cz> :-)
  */
 
-void modbus_init();
-void modbus_poll();
+/*
+ * Call this at the beginning of the program.
+ */
+void modbus_init(uint8_t unit_id);
+
+/*
+ * Call this frequently. Returns 0 when no data was received
+ * and the processing went on quickly. Returns 1 after potentially lengthy
+ * packet processing.
+ */
+uint8_t modbus_poll();
+
+typedef enum {
+	MB_OK = 0,
+	MB_ILLEGAL_FUNC = 1,
+	MB_ILLEGAL_ADDR = 2,
+	MB_ILLEGAL_VAL  = 3,
+} mb_exception;
+
+#define MB_HOLD_REGS_BASE	0	// first register
+#define MB_N_HOLD_REGS		80	// total # of registers
+#define MB_N_HOLD_REGS_EEPROM	20	// the first N registers eeprom-backed
+extern uint16_t hold_regs[MB_N_HOLD_REGS];
+#define mb_unit_id	(hold_regs[0])	// MODBUS id in the first register
+
+uint8_t hold_reg_is_valid(uint16_t reg, uint16_t val);
 
 #endif /* MODBUS_H__ */