Kenji Arai / nRF51_Vdd

Read nRF51822(BLE Chip) VDD voltage and return 100 to 0% charging level

Dependents:   BLE_Temp_Vdd_via_UART_TY BLE_EddystoneBeacon_w_ACC_TY51822 BLE_LoopbackUART_low_pwr_w_RTC1 BLE_Paired_Server ... more

This is only for nRF51822.

You don't need any hardware circuit. Just read internal Vdd voltage using ADC function inside of the chip.

Diff: nRF51_Vdd.cpp

Revision:
1:7da210f6aff1
Parent:
0:11c9f031975d
Child:
2:9b1e219a7695
--- a/nRF51_Vdd.cpp	Sun Jan 24 03:53:32 2016 +0000
+++ b/nRF51_Vdd.cpp	Wed May 04 05:46:07 2016 +0000
@@ -7,7 +7,7 @@
  *  http://www.page.sannet.ne.jp/kenjia/index.html
  *  http://mbed.org/users/kenjiArai/
  *      Created:    January   23rd, 2016
- *      Revised:    January   24th, 2016
+ *      Revised:    May        1st, 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
@@ -17,18 +17,31 @@
  */
 
 #include "nRF51_Vdd.h"
+#include "nrf_delay.h"
+
+nRF51_Vdd::nRF51_Vdd(float vdd100percent, float vddzeropercent, uint8_t adc_use){
+    v100p = vdd100percent;
+    v0p = vddzeropercent;
+    use_adc_for_others = adc_use;
+}
 
 nRF51_Vdd::nRF51_Vdd(float vdd100percent, float vddzeropercent){
     v100p = vdd100percent;
     v0p = vddzeropercent;
+    use_adc_for_others = USE_ADC;
 }
 
 nRF51_Vdd::nRF51_Vdd(void){
     v100p = 3.3f;
     v0p = 1.8f;
+    use_adc_for_others = USE_ADC;
 }
 
 float nRF51_Vdd::read_real_value(void){
+    NRF_ADC->POWER       = 1;
+    nrf_delay_us(5);
+    NRF_ADC->EVENTS_END  = 0;
+    NRF_ADC->TASKS_STOP  = 1;
     reg0 = NRF_ADC->ENABLE;     // save register value
     reg1 = NRF_ADC->CONFIG;     // save register value
     reg2 = NRF_ADC->RESULT;     // save register value
@@ -41,16 +54,27 @@
     NRF_ADC->EVENTS_END  = 0;
     NRF_ADC->TASKS_START = 1;
     while (!NRF_ADC->EVENTS_END) {;}
-    wrk = NRF_ADC->RESULT;      // 10 bit result
-    NRF_ADC->ENABLE = reg0;     // recover register value
-    NRF_ADC->CONFIG = reg1;     // recover register value
-    NRF_ADC->RESULT = reg2;     // recover register value
+    wrk = NRF_ADC->RESULT;          // 10 bit result
     NRF_ADC->EVENTS_END  = 0;
+    NRF_ADC->TASKS_STOP = 1;
+    if (use_adc_for_others == USE_ADC){
+        NRF_ADC->ENABLE = reg0;     // recover register value
+        NRF_ADC->CONFIG = reg1;     // recover register value
+        NRF_ADC->RESULT = reg2;     // recover register value
+        NRF_ADC->EVENTS_END  = 0;
+    } else {
+        NRF_ADC->CONFIG      = 0x18;
+        NRF_ADC->EVENTS_END  = 1;
+        NRF_ADC->TASKS_STOP  = 1;
+        NRF_ADC->ENABLE      = 0;
+        nrf_delay_us(5);
+        NRF_ADC->POWER       = 0;
+        nrf_delay_us(5);
+    }
     return ((float)wrk / 1024 * 1.2 * 3.0);            
 }
 
-uint8_t nRF51_Vdd::read(void)
-{
+uint8_t nRF51_Vdd::read(void){
     wrk_vdd = read_real_value();
     if (wrk_vdd <= v0p){
         return 0;