Diff: main.cpp

Revision:

0:39468e6d5d62

diff -r 000000000000 -r 39468e6d5d62 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Jun 22 09:51:10 2014 +0000
@@ -0,0 +1,32 @@
+#include "mbed.h"
+
+DigitalOut myled(LED1);
+Serial pc(USBTX, USBRX); // tx, rx
+AnalogIn ain(A0); //is ADC0_0: must be channel 0 of ADC0 or ADC1
+
+#define ADCn_INSEL_TEMPERATURE (0x3)
+#define SYSCON_PDRUNCFG_TS_PD (1 << 18)
+#define SYSCON_PDRUNCFG_IREF_PD (1 << 17)
+
+int main() {
+    pc.printf("Starting program...\r\n");
+    
+    //Enable temperature sensor and internal voltage reference, see um chapter 31
+    LPC_SYSCON->PDRUNCFG &= ~(SYSCON_PDRUNCFG_TS_PD | SYSCON_PDRUNCFG_IREF_PD);
+    
+    //Select source for channel 0: temperature sensor
+    LPC_ADC0->INSEL = ADCn_INSEL_TEMPERATURE;
+    
+    while(1) {
+        unsigned short raw = ain.read_u16();
+        pc.printf("Raw u16 value %u\r\n", raw);
+        pc.printf("Raw 12 Bit value %u\r\n", (raw >> 4));
+        float value = ((float)raw) / (float) 0xffff;
+        pc.printf("Float value %f\r\n", value);
+        pc.printf("Read value %f mV\r\n", value * 3300.0f);
+        float temperature = -(((value * 3300.0f) - 577.3f) / 2.29f); 
+        pc.printf("Read temperature (about) %f deg C\r\n", temperature);
+        myled = !myled;
+        wait(1);
+    }
+}