migration

modbus.c

@@ -0,0 +1,69 @@
+#include "modbus.h"
+#include "crc.h"
+#include "uart.h"
+#include <xc.h>
+#include <stdint.h>
+#include <stdio.h>
+
+// Modbus functions
+#define READ_INPUT_REGISTERS    0x04
+#define READ_HOLDING_REGISTERS  0x03
+#define WRITE_SINGLE_REGISTER   0x06
+
+// Modbus data model
+uint8_t modbusAddress;
+uint16_t input_registers[2];
+uint16_t holding_registers[2];
+
+// Modbus error codes
+#define ILLEGAL_FUNCTION		1
+#define ILLEGAL_DATA_ADDRESS	2
+#define ILLEGAL_DATA_VALUE		3
+#define SLAVE_DEVICE_FAILURE	4
+
+/**
+ * Buffers for serial receive and send operations 
+ * which are more than one byte long
+ **/
+uint8_t rx_buf[256];
+uint8_t tx_buf[256];
+
+// Current position pointer for storing receive position
+uint8_t recPtr = 0;
+
+void modbus_timer(void)
+{
+	// TODO -> complete what to do on modbus timer event
+   
+}
+
+uint8_t modbus_analyse_and_answer(void) {
+	// TODO -> complete the modbus analyse and answer
+    rx_buf[0] = 0;
+    
+    //sprintf(tx_buf, "%i", modbusAddress, );
+  
+}
+
+void modbus_char_recvd(uint8_t c)
+{
+	// TODO -> complete modbus char receive 
+}
+
+void modbus_send(uint8_t length)
+{
+	uint16_t temp16; 
+	uint8_t i;
+
+	// TODO -> complete modbus RCR calculation
+	length += 2; // add 2 CRC bytes for total size
+
+	// For all the bytes to be transmitted
+  uart_send(tx_buf,length);
+}
+
+void modbus_init(uint8_t address)
+{
+	modbusAddress = address;
+  // TODO -> confikre timer for modbus usage
+}