Yihui Xiong
/
Seeed_nRF51822_MPU9250
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Fork of
Seeed_Tiny_BLE_Flash
by 
Darren Huang
Diff: battery.h
- Revision:
- 0:26da608265f8
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/battery.h Sat Feb 07 08:13:51 2015 +0000
@@ -0,0 +1,43 @@
+
+
+#ifndef __BATTERY_H__
+#define __BATTERY_H__
+
+#include "mbed.h"
+
+class Battery {
+public:
+ Battery(PinName pin) {
+ uint32_t n = (uint32_t) pin;
+ channel = 1 << (1 + n);
+ }
+
+ float read() {
+ uint32_t pre_enable_register = NRF_ADC->ENABLE;
+ uint32_t pre_config_register = NRF_ADC->CONFIG;
+
+
+ NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
+ NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
+ (ADC_CONFIG_INPSEL_AnalogInputNoPrescaling << ADC_CONFIG_INPSEL_Pos) |
+ (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
+ (channel << ADC_CONFIG_PSEL_Pos) |
+ (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);
+
+ NRF_ADC->TASKS_START = 1;
+ while (((NRF_ADC->BUSY & ADC_BUSY_BUSY_Msk) >> ADC_BUSY_BUSY_Pos) == ADC_BUSY_BUSY_Busy) {
+ }
+
+ uint16_t value = NRF_ADC->RESULT;
+
+ NRF_ADC->ENABLE = pre_enable_register;
+ NRF_ADC->CONFIG = pre_config_register;
+
+ return (float)value * (1.0f / (float)0x3FF) * 1.2 * 12.2 / 2.2;
+ }
+
+private:
+ uint32_t channel;
+};
+
+#endif // __BATTERY_H__