Diff: smbus.cpp

Revision:

0:db513e91a2c9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/smbus.cpp	Wed Jul 15 18:20:00 2020 +0000
@@ -0,0 +1,91 @@
+#include "smbus.h"
+
+void smbus_start()
+{
+	i2c.start();
+}
+
+void smbus_stop()
+{
+	i2c.stop();
+}
+
+unsigned char smbus_send_byte(unsigned char byte)
+{
+	return i2c.write(byte);
+}
+
+unsigned char smbus_send_address(unsigned char address, unsigned char rw)
+{
+	unsigned char addr = address << 1;
+	addr = addr + rw;
+	
+	return smbus_send_byte(addr);
+}
+
+unsigned char smbus_read_byte(unsigned char *status)
+{
+	unsigned char byte;
+	
+	byte = i2c.read(i2c.ACK);
+
+
+	return byte;
+}
+
+unsigned int smbus_read_uint(unsigned char *status, unsigned char read_mode){
+
+	unsigned char byte0, byte1, low, high, sts = 0;
+	unsigned int value = 0x0000;
+	
+	
+	byte0 = smbus_read_byte(&sts);
+	*status = sts;
+
+	if(*status != 0x8B)
+	 return 0;
+
+	byte1 = smbus_read_byte(&sts);
+	*status = sts;
+	
+	if(read_mode == BIG_ENDIAN){
+		high = byte0;
+		low = byte1;
+	}
+	else{
+		high = byte1;
+		low = byte0;
+	}
+
+	value |= low;
+	value |= high<<8;
+
+	return value;
+
+}
+
+unsigned char smbus_write_uint(unsigned char read_mode, unsigned int value){
+
+	unsigned char lsb, msb, byte0, byte1, status;
+
+	lsb = value;
+	msb = value >> 8;
+
+	if(read_mode == BIG_ENDIAN){
+		byte0 = msb;
+		byte1 = lsb;
+	}
+	else{
+		byte1 = msb;
+		byte0 = lsb;
+	}
+
+	status = smbus_send_byte(byte0);
+	if(!i2c.ACK) return status;
+
+	status = smbus_send_byte(byte1);
+	return status;
+	
+
+}
+