Diff: main.cpp

Revision:

0:62a1e3699786

Child:

1:2fa5ba8b899f

diff -r 000000000000 -r 62a1e3699786 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Nov 16 12:10:42 2016 +0000
@@ -0,0 +1,128 @@
+/*
+ * mbed Application program / Simple Digital Volt-meter
+ *      on Nucleo-L152RE
+ *
+ * Copyright (c) 2016 Kenji Arai / JH1PJL
+ *  http://www.page.sannet.ne.jp/kenjia/index.html
+ *  http://mbed.org/users/kenjiArai/
+ *      Created:    Nobember  15th, 2016
+ *      Revised:    Nobember  16th, 2016
+ *
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#define VOLTMETER
+//#define CALC_VDD
+//#define READ_VREF_TEMP
+
+#include "mbed.h"
+
+#if defined(VOLTMETER)
+
+/* Use R1 & R2 divider
+                          | Nucleo-L152RE
+    V_INPUT <-- R1 -.-----| A0(PA_0)
+                    |     |
+                    R2    |
+                    |_____| GND
+                          |
+ */
+#define     R1      (3332.4f)   // target 3.3K Ohm
+#define     R2      (987.54f)   // target 1K Ohm
+
+AnalogIn    v_input(A0);
+AnalogIn    vref(ADC_VREF);
+DigitalOut  myled(LED1);
+Timer       tmr;
+
+int main() {
+    double      v_in, vdd;
+    double      v_in_actual;
+
+    while(true) {
+        tmr.reset();
+        tmr.start();
+        vdd  = (1.224f) / vref.read();
+        v_in = v_input.read();
+        v_in_actual = v_in * vdd * ( R1 + R2) / R2;
+        printf("V IN : %5.3f [V]\r\n", v_in_actual);
+        wait_ms(500 - tmr.read_ms());      // 1sec interval    
+    }
+}
+#endif
+
+#if defined(CALC_VDD)
+
+AnalogIn    vref(ADC_VREF);
+DigitalOut  myled(LED1);
+Timer       tmr;
+
+/*
+    Calculate Voltage data
+
+    Vdd:        CPU Vdd line voltage
+                (If VREF+ connected Vdd and VREF- connected GND)
+    dt_adc:     ADC data (12bit)
+    VREFINT:    Internal bandgap voltage
+                1.202V(min), 1.224V(typ), 1.242V(max)
+    VREFINT_CAL Raw data acquired at temperature of 30 °C,
+                Vdd = 3 V Addr: 0x1FF80078-0x1FF80079
+
+    VREFINT_CAL = 3000 * VREF(Factory) / 4096      [V]
+    Vdd         = VREFINT_CAL / VREFINT(ADC float) [V]
+
+    reference:
+    en.CD00277537.pdf page 56/133 (April 2016 DocID17659 Rev 12)
+    en.CD00240193.pdf page 287/908 (September 2016 DocID15965 Rev 14)
+*/
+int main() {
+    double      vdd;
+    double      vdd_calibed;
+    double      vref_calibed;
+    double      vref_f;
+    uint16_t    vref_u16;
+    uint16_t    vref_cal;
+
+    vref_cal = *(__IO uint16_t *)((uint32_t)0x1ff800f8);
+    while(true) {
+        tmr.reset();
+        tmr.start();
+        myled = 1;
+        wait(0.2f);   
+        myled = 0;
+        wait(0.6f);
+        vref_f   = vref.read();
+        vref_u16 = vref.read_u16();
+        printf("Vref(f): %f, Vref : %u, Vref_CAL : %u,",
+                     vref_f,  vref_u16,      vref_cal);
+        vref_calibed = 3.0f * (double)vref_cal / 4096.0f;
+        vdd_calibed  = vref_calibed / vref_f;
+        vdd          = 1.224f / vref_f;
+        printf(" Vref(Calibrated) : %f, VDD(Calibrated) : %f, VDD : %f,",
+                         vref_calibed,           vdd_calibed,      vdd);
+        printf(" VDD(measured my Nucleo) : 3.3163\r\n");
+        wait_ms(1000 - tmr.read_ms());      // 1sec interval   
+    }
+}
+#endif
+
+#if defined(READ_VREF_TEMP)
+
+AnalogIn   vrefint(ADC_VREF);
+AnalogIn   tempint(ADC_TEMP);
+
+int main() {
+    while(true) {
+        printf("Vref(f): %f, Vref : %u, Temperature : %u\r\n",
+                 vrefint.read(), vrefint.read_u16(), tempint.read_u16());
+        wait(1.0f);
+    }
+}
+#endif
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