Diff: mcp7940n.cpp

Revision:

2:4b7f5a060c22

Child:

3:6ca4d7dd8bea

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mcp7940n.cpp	Sun Oct 01 19:30:04 2017 +0000
@@ -0,0 +1,37 @@
+#include "i2c.h"
+#include "mcp7940n.h"
+
+//endere�o do dispositivo, deslocado por causa do bit de RW
+//1101000
+#define MCP7940N_CTRL_ID (0x6e<<1)
+#define I2C_WRITE 0
+#define I2C_READ  1
+
+int dec2bcd(int value) {
+    return ((value / 10 * 16) + (value % 10));
+}
+int bcd2dec(int value) {
+    return ((value / 16 * 10) + (value % 16));
+}
+void mcpInit(void) {
+    i2cInit();
+}
+void mcpStartClock(void) {
+    int seconds;
+    seconds = mcpReadData(SEC);
+    mcpWriteData(0x7f & seconds,SEC);
+    return;
+}
+void mcpWriteData(unsigned char value, int address) {
+    i2cWriteByte(1,0, MCP7940N_CTRL_ID |I2C_WRITE);
+    i2cWriteByte(0,0,address);
+    i2cWriteByte(0,1,value);
+}
+int mcpReadData(int address) {
+    int result;
+    i2cWriteByte(1,0,MCP7940N_CTRL_ID  | I2C_WRITE);
+    i2cWriteByte(0,0,address);
+    i2cWriteByte(1,0, MCP7940N_CTRL_ID  | I2C_READ);
+    result = i2cReadByte(1,1 );
+    return result;
+}