Tiberiu Stoleru
very simple program for reading temperature (on chip and external diode) from MAX1617 / TCM1617 using standard I2C
Revision 0:00e87008c034, committed 2015-04-06
- Comitter:
- tiberiu21
- Date:
- Mon Apr 06 13:43:42 2015 +0000
- Commit message:
- initial version
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon Apr 06 13:43:42 2015 +0000
@@ -0,0 +1,57 @@
+/***********************************************************************
+* Read temperature by using DS1617
+* read external diode temp. between DXP/DXN pin
+* read on-chip temperature
+* if changed then serial out
+* end
+* tested on nucleo-F401
+************************************************************************/
+
+#include "mbed.h"
+
+
+#define MAX1617_RIT (0x00) // internal temperature register
+#define MAX1617_RET (0x01) // external, (diode dxp-dxn)temperature register
+#define MAX1617_ADDR (0x30) // MAX1617 address (ADD0=0 ADD1=0)
+#define MAX1617_OSHT (0x0F) // MAX1617 one shot temperature read command, both channels
+
+
+I2C i2c(I2C_SDA, I2C_SCL);
+
+DigitalOut myled(LED1);
+
+Serial pc(SERIAL_TX, SERIAL_RX);
+
+int main()
+{
+
+ char data_read_1[1]; //temp extread holder
+ char data_read_2[1]; //temp read holder
+ int rispold_1=0;
+ int rispold_2=0;
+
+
+ while (1) {
+ char command_one_shot[1] = {MAX1617_OSHT};
+ char command_ext_temp[1] = {MAX1617_RET};
+ char command_int_temp[1] = {MAX1617_RIT};
+ //I2C transactions
+ i2c.write(MAX1617_ADDR, command_one_shot , 1, 0); // no stop //one shot temp read
+ i2c.write(MAX1617_ADDR, command_ext_temp, 1, 1); // no stop //ext temp read
+ i2c.read(MAX1617_ADDR, data_read_1, 1, 0);
+ i2c.write(MAX1617_ADDR, command_int_temp, 1, 1); // no stop //int temp read
+ i2c.read(MAX1617_ADDR, data_read_2, 1, 0);
+
+ //
+ int risp1 = (int)data_read_1[0];
+ int risp2 = (int)data_read_2[0];
+ if ((risp1 != rispold_1)|(risp2 != rispold_2))
+ pc.printf("temp int = %d\n", risp2);
+ pc.printf("temp ext = %d\n", risp1);
+ rispold_1 = risp1;
+ rispold_2 = risp2;
+ myled = !myled;
+ wait(0.3);
+ }
+
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Apr 06 13:43:42 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/7e07b6fb45cf \ No newline at end of file