Kenji Arai / Mbed 2 deprecated NucleoL152_Volt_meter

Simple digital volt meter using internal reference(VREFINT)

Dependencies:   mbed

main.cpp@1:2fa5ba8b899f, 2016-11-16 (annotated)

Committer:
kenjiArai
Date:
Wed Nov 16 12:40:58 2016 +0000
Revision:
1:2fa5ba8b899f
Parent:
0:62a1e3699786 
modify comment

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kenjiArai 0:62a1e3699786 1 /*
kenjiArai 0:62a1e3699786 2 * mbed Application program / Simple Digital Volt-meter
kenjiArai 0:62a1e3699786 3 * on Nucleo-L152RE
kenjiArai 0:62a1e3699786 4 *
kenjiArai 0:62a1e3699786 5 * Copyright (c) 2016 Kenji Arai / JH1PJL
kenjiArai 0:62a1e3699786 6 * http://www.page.sannet.ne.jp/kenjia/index.html
kenjiArai 0:62a1e3699786 7 * http://mbed.org/users/kenjiArai/
kenjiArai 0:62a1e3699786 8 * Created: Nobember 15th, 2016
kenjiArai 0:62a1e3699786 9 * Revised: Nobember 16th, 2016
kenjiArai 0:62a1e3699786 10 *
kenjiArai 0:62a1e3699786 11 *
kenjiArai 0:62a1e3699786 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
kenjiArai 0:62a1e3699786 13 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
kenjiArai 0:62a1e3699786 14 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
kenjiArai 0:62a1e3699786 15 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
kenjiArai 0:62a1e3699786 16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
kenjiArai 0:62a1e3699786 17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
kenjiArai 0:62a1e3699786 18 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
kenjiArai 0:62a1e3699786 19 */
kenjiArai 0:62a1e3699786 20
kenjiArai 0:62a1e3699786 21 #define VOLTMETER
kenjiArai 0:62a1e3699786 22 //#define CALC_VDD
kenjiArai 0:62a1e3699786 23 //#define READ_VREF_TEMP
kenjiArai 0:62a1e3699786 24
kenjiArai 0:62a1e3699786 25 #include "mbed.h"
kenjiArai 0:62a1e3699786 26
kenjiArai 0:62a1e3699786 27 #if defined(VOLTMETER)
kenjiArai 0:62a1e3699786 28
kenjiArai 0:62a1e3699786 29 /* Use R1 & R2 divider
kenjiArai 0:62a1e3699786 30 | Nucleo-L152RE
kenjiArai 0:62a1e3699786 31 V_INPUT <-- R1 -.-----| A0(PA_0)
kenjiArai 0:62a1e3699786 32 | |
kenjiArai 0:62a1e3699786 33 R2 |
kenjiArai 0:62a1e3699786 34 |_____| GND
kenjiArai 0:62a1e3699786 35 |
kenjiArai 0:62a1e3699786 36 */
kenjiArai 0:62a1e3699786 37 #define R1 (3332.4f) // target 3.3K Ohm
kenjiArai 0:62a1e3699786 38 #define R2 (987.54f) // target 1K Ohm
kenjiArai 0:62a1e3699786 39
kenjiArai 0:62a1e3699786 40 AnalogIn v_input(A0);
kenjiArai 0:62a1e3699786 41 AnalogIn vref(ADC_VREF);
kenjiArai 0:62a1e3699786 42 Timer tmr;
kenjiArai 0:62a1e3699786 43
kenjiArai 0:62a1e3699786 44 int main() {
kenjiArai 0:62a1e3699786 45 double v_in, vdd;
kenjiArai 0:62a1e3699786 46 double v_in_actual;
kenjiArai 0:62a1e3699786 47
kenjiArai 0:62a1e3699786 48 while(true) {
kenjiArai 0:62a1e3699786 49 tmr.reset();
kenjiArai 0:62a1e3699786 50 tmr.start();
kenjiArai 0:62a1e3699786 51 vdd = (1.224f) / vref.read();
kenjiArai 0:62a1e3699786 52 v_in = v_input.read();
kenjiArai 0:62a1e3699786 53 v_in_actual = v_in * vdd * ( R1 + R2) / R2;
kenjiArai 0:62a1e3699786 54 printf("V IN : %5.3f [V]\r\n", v_in_actual);
kenjiArai 1:2fa5ba8b899f 55 wait_ms(500 - tmr.read_ms()); // 0.5sec interval
kenjiArai 0:62a1e3699786 56 }
kenjiArai 0:62a1e3699786 57 }
kenjiArai 0:62a1e3699786 58 #endif
kenjiArai 0:62a1e3699786 59
kenjiArai 0:62a1e3699786 60 #if defined(CALC_VDD)
kenjiArai 0:62a1e3699786 61
kenjiArai 0:62a1e3699786 62 AnalogIn vref(ADC_VREF);
kenjiArai 0:62a1e3699786 63 DigitalOut myled(LED1);
kenjiArai 0:62a1e3699786 64 Timer tmr;
kenjiArai 0:62a1e3699786 65
kenjiArai 0:62a1e3699786 66 /*
kenjiArai 0:62a1e3699786 67 Calculate Voltage data
kenjiArai 0:62a1e3699786 68
kenjiArai 0:62a1e3699786 69 Vdd: CPU Vdd line voltage
kenjiArai 0:62a1e3699786 70 (If VREF+ connected Vdd and VREF- connected GND)
kenjiArai 0:62a1e3699786 71 dt_adc: ADC data (12bit)
kenjiArai 0:62a1e3699786 72 VREFINT: Internal bandgap voltage
kenjiArai 0:62a1e3699786 73 1.202V(min), 1.224V(typ), 1.242V(max)
kenjiArai 0:62a1e3699786 74 VREFINT_CAL Raw data acquired at temperature of 30 °C,
kenjiArai 0:62a1e3699786 75 Vdd = 3 V Addr: 0x1FF80078-0x1FF80079
kenjiArai 0:62a1e3699786 76
kenjiArai 0:62a1e3699786 77 VREFINT_CAL = 3000 * VREF(Factory) / 4096 [V]
kenjiArai 0:62a1e3699786 78 Vdd = VREFINT_CAL / VREFINT(ADC float) [V]
kenjiArai 0:62a1e3699786 79
kenjiArai 0:62a1e3699786 80 reference:
kenjiArai 0:62a1e3699786 81 en.CD00277537.pdf page 56/133 (April 2016 DocID17659 Rev 12)
kenjiArai 0:62a1e3699786 82 en.CD00240193.pdf page 287/908 (September 2016 DocID15965 Rev 14)
kenjiArai 0:62a1e3699786 83 */
kenjiArai 0:62a1e3699786 84 int main() {
kenjiArai 0:62a1e3699786 85 double vdd;
kenjiArai 0:62a1e3699786 86 double vdd_calibed;
kenjiArai 0:62a1e3699786 87 double vref_calibed;
kenjiArai 0:62a1e3699786 88 double vref_f;
kenjiArai 0:62a1e3699786 89 uint16_t vref_u16;
kenjiArai 0:62a1e3699786 90 uint16_t vref_cal;
kenjiArai 0:62a1e3699786 91
kenjiArai 0:62a1e3699786 92 vref_cal = *(__IO uint16_t *)((uint32_t)0x1ff800f8);
kenjiArai 0:62a1e3699786 93 while(true) {
kenjiArai 0:62a1e3699786 94 tmr.reset();
kenjiArai 0:62a1e3699786 95 tmr.start();
kenjiArai 0:62a1e3699786 96 myled = 1;
kenjiArai 0:62a1e3699786 97 wait(0.2f);
kenjiArai 0:62a1e3699786 98 myled = 0;
kenjiArai 0:62a1e3699786 99 wait(0.6f);
kenjiArai 0:62a1e3699786 100 vref_f = vref.read();
kenjiArai 0:62a1e3699786 101 vref_u16 = vref.read_u16();
kenjiArai 0:62a1e3699786 102 printf("Vref(f): %f, Vref : %u, Vref_CAL : %u,",
kenjiArai 0:62a1e3699786 103 vref_f, vref_u16, vref_cal);
kenjiArai 0:62a1e3699786 104 vref_calibed = 3.0f * (double)vref_cal / 4096.0f;
kenjiArai 0:62a1e3699786 105 vdd_calibed = vref_calibed / vref_f;
kenjiArai 0:62a1e3699786 106 vdd = 1.224f / vref_f;
kenjiArai 0:62a1e3699786 107 printf(" Vref(Calibrated) : %f, VDD(Calibrated) : %f, VDD : %f,",
kenjiArai 0:62a1e3699786 108 vref_calibed, vdd_calibed, vdd);
kenjiArai 0:62a1e3699786 109 printf(" VDD(measured my Nucleo) : 3.3163\r\n");
kenjiArai 0:62a1e3699786 110 wait_ms(1000 - tmr.read_ms()); // 1sec interval
kenjiArai 0:62a1e3699786 111 }
kenjiArai 0:62a1e3699786 112 }
kenjiArai 0:62a1e3699786 113 #endif
kenjiArai 0:62a1e3699786 114
kenjiArai 0:62a1e3699786 115 #if defined(READ_VREF_TEMP)
kenjiArai 0:62a1e3699786 116
kenjiArai 0:62a1e3699786 117 AnalogIn vrefint(ADC_VREF);
kenjiArai 0:62a1e3699786 118 AnalogIn tempint(ADC_TEMP);
kenjiArai 0:62a1e3699786 119
kenjiArai 0:62a1e3699786 120 int main() {
kenjiArai 0:62a1e3699786 121 while(true) {
kenjiArai 0:62a1e3699786 122 printf("Vref(f): %f, Vref : %u, Temperature : %u\r\n",
kenjiArai 0:62a1e3699786 123 vrefint.read(), vrefint.read_u16(), tempint.read_u16());
kenjiArai 0:62a1e3699786 124 wait(1.0f);
kenjiArai 0:62a1e3699786 125 }
kenjiArai 0:62a1e3699786 126 }
kenjiArai 0:62a1e3699786 127 #endif