Seeed / Grove_Node

The firmware of the Grove Node

Dependencies:   BLE_API color_pixels mbed-src-nrf51822 nRF51822

Fork of BLE_LoopbackUART by Bluetooth Low Energy

battery.h@11:c0885b74a63a, 2015-06-04 (annotated)

Committer:
yihui
Date:
Thu Jun 04 12:39:32 2015 +0000
Revision:
11:c0885b74a63a
Parent:
9:84cb66d0375d 
fixed direct control bug

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yihui 9:84cb66d0375d 1
yihui 9:84cb66d0375d 2
yihui 9:84cb66d0375d 3 #ifndef __BATTERY_H__
yihui 9:84cb66d0375d 4 #define __BATTERY_H__
yihui 9:84cb66d0375d 5
yihui 9:84cb66d0375d 6 #include "mbed.h"
yihui 9:84cb66d0375d 7
yihui 9:84cb66d0375d 8 class Battery {
yihui 9:84cb66d0375d 9 public:
yihui 9:84cb66d0375d 10 Battery(PinName pin) {
yihui 9:84cb66d0375d 11 uint32_t n = (uint32_t) pin;
yihui 9:84cb66d0375d 12 channel = 1 << (1 + n);
yihui 9:84cb66d0375d 13 }
yihui 9:84cb66d0375d 14
yihui 9:84cb66d0375d 15 float read() {
yihui 9:84cb66d0375d 16 uint32_t pre_enable_register = NRF_ADC->ENABLE;
yihui 9:84cb66d0375d 17 uint32_t pre_config_register = NRF_ADC->CONFIG;
yihui 9:84cb66d0375d 18
yihui 9:84cb66d0375d 19
yihui 9:84cb66d0375d 20 NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
yihui 9:84cb66d0375d 21 NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
yihui 9:84cb66d0375d 22 (ADC_CONFIG_INPSEL_AnalogInputNoPrescaling << ADC_CONFIG_INPSEL_Pos) |
yihui 9:84cb66d0375d 23 (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
yihui 9:84cb66d0375d 24 (channel << ADC_CONFIG_PSEL_Pos) |
yihui 9:84cb66d0375d 25 (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);
yihui 9:84cb66d0375d 26
yihui 9:84cb66d0375d 27 NRF_ADC->TASKS_START = 1;
yihui 9:84cb66d0375d 28 while (((NRF_ADC->BUSY & ADC_BUSY_BUSY_Msk) >> ADC_BUSY_BUSY_Pos) == ADC_BUSY_BUSY_Busy) {
yihui 9:84cb66d0375d 29 }
yihui 9:84cb66d0375d 30
yihui 9:84cb66d0375d 31 uint16_t value = NRF_ADC->RESULT;
yihui 9:84cb66d0375d 32
yihui 9:84cb66d0375d 33 NRF_ADC->ENABLE = pre_enable_register;
yihui 9:84cb66d0375d 34 NRF_ADC->CONFIG = pre_config_register;
yihui 9:84cb66d0375d 35
yihui 9:84cb66d0375d 36 return (float)value * (1.0f / (float)0x3FF) * 1.2 * 12.2 / 2.2;
yihui 9:84cb66d0375d 37 }
yihui 9:84cb66d0375d 38
yihui 9:84cb66d0375d 39 private:
yihui 9:84cb66d0375d 40 uint32_t channel;
yihui 9:84cb66d0375d 41 };
yihui 9:84cb66d0375d 42
yihui 9:84cb66d0375d 43 #endif // __BATTERY_H__