Edoardo De Marchi
Test code for LM75AIM
Revision 0:75c4b60db793, committed 2012-06-27
- Comitter:
- edodm85
- Date:
- Wed Jun 27 15:45:09 2012 +0000
- Child:
- 1:7d868212c8c1
- Commit message:
- Rev 1
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/LM75A/.lib Wed Jun 27 15:45:09 2012 +0000 @@ -0,0 +1,1 @@ + \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/LM75A/LM75A.cpp Wed Jun 27 15:45:09 2012 +0000
@@ -0,0 +1,78 @@
+/*
+ * Autor: Edoardo De Marchi
+ * Date: 04/01/12
+ * Version: 0.1
+ * File: LM75.cpp
+ */
+
+#include "LM75A.h"
+
+#define TEMP_REG_ADDR 0x00 // Temperature address
+#define CONFIG_REG_ADDR 0x01 // configuration register
+Serial pc2(USBTX, USBRX);
+
+// costructor
+LM75A::LM75A(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr){
+
+}
+
+
+// destructor
+LM75A::~LM75A(){
+
+}
+
+
+float LM75A::read(){
+
+ const char tempRegAddr = TEMP_REG_ADDR;
+
+ m_i2c.write(m_addr, &tempRegAddr, 1); // Pointer to the temperature register
+
+ char cmd[2] = {0,0};
+ m_i2c.read(m_addr, cmd, 2); // read temperature register
+
+ unsigned short val = ((cmd[0] << 8) + cmd[1]) >> 7; //val = (cmd[ 1 ] << 1) | ( cmd[ 0 ] >> 7 ) ;
+
+ pc2.printf("reg: ");
+ pc2.printf("%d - %d \n", cmd[1], cmd[0]); // debug
+
+ float temp = (float) ((float)val * 0.5);
+
+ return temp;
+}
+
+
+char LM75A::read_reg(char addr){
+
+
+ char data[1] = {0};
+ char ret = addr;
+ m_i2c.write(m_addr, &ret, 1);
+ wait_us(10);
+ m_i2c.read(m_addr, data, 1); // Read register content
+ wait_us(20);
+ pc2.printf("reg: %#x \n\r", data[0]); // debug
+
+ return ret;
+
+}
+
+
+
+/** Write to specified MMA7660FC register
+*
+* @param char addr: the internal registeraddress of the MMA7660FC
+* @param char data: write data to selected Register
+*/
+void LM75A::write_reg(char addr, char data){
+
+ char data2[2] = {0, 0};
+
+ data2[0] = addr;
+ data2[1] = data;
+
+ m_i2c.write(m_addr, data2, 2);
+ wait_us(50);
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/LM75A/LM75A.h Wed Jun 27 15:45:09 2012 +0000
@@ -0,0 +1,45 @@
+/*
+ * Autor: Edoardo De Marchi
+ * Date: 04/01/12
+ * Version: 0.1
+ * File: LM75.h
+ */
+
+//#ifndef LM75A_H
+//#define LM75A_H
+#pragma once
+
+#include "mbed.h"
+
+
+/* Library for the LM75A temperature sensor.
+The TLM75A is an I2C digital temperature sensor in a small SOP-8 package,
+with a 0.5C resolution and 2C accuracy.
+*/
+
+class LM75A{ // Creates an instance of the class.
+ public:
+
+ // Connect module at I2C address addr using I2C port pins sda and scl.
+ LM75A(PinName sda, PinName scl, int addr);
+
+
+ // Destroys instance.
+ ~LM75A();
+
+ // Reads the current temperature.
+ float read();
+
+
+ char read_reg(char addr);
+
+
+ void write_reg(char addr, char data);
+
+
+ private:
+ I2C m_i2c;
+ int m_addr;
+};
+
+// #endif
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Jun 27 15:45:09 2012 +0000
@@ -0,0 +1,35 @@
+/*
+ * Author: Edoardo De Marchi
+ * Date: 16-05-2011
+ * Notes: Read temperature from LM75AIM
+*/
+
+
+#include "mbed.h"
+#include "LM75A.h"
+
+
+Serial pc(USBTX, USBRX);
+LM75A temp(p28, p27, 0x90); //SDA, SCL, ADDRESS
+
+
+int main(){
+int n = 0;
+
+ while(1){
+ float var = temp.read();
+ pc.printf("The temp is: %4.2f degree Celsius\n\r", var);
+ temp.read_reg(0x01);
+ if(n == 3){
+ temp.write_reg(0x01, 0x03);
+ n = 0;
+ }else{
+ temp.write_reg(0x01, 0x00);
+ }
+ n++;
+ wait(2);
+ }
+
+
+
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.lib Wed Jun 27 15:45:09 2012 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/projects/libraries/svn/mbed/trunk@43 \ No newline at end of file