Yihui Xiong / nrf51822_fix_i2c_spi_conflict

fix nrf51822 i2c & spi conflict

Dependencies:   BLE_API eMPL_MPU6050 nRF51822

Fork of Seeed_Tiny_BLE_Flash by Darren Huang

battery.h@5:b8c02645e6af, 2015-11-17 (annotated)

Committer:
yihui
Date:
Tue Nov 17 07:48:56 2015 +0000
Revision:
5:b8c02645e6af
Parent:
0:26da608265f8 
fix i2c & spi conflict

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yihui 0:26da608265f8 1
yihui 0:26da608265f8 2
yihui 0:26da608265f8 3 #ifndef __BATTERY_H__
yihui 0:26da608265f8 4 #define __BATTERY_H__
yihui 0:26da608265f8 5
yihui 0:26da608265f8 6 #include "mbed.h"
yihui 0:26da608265f8 7
yihui 0:26da608265f8 8 class Battery {
yihui 0:26da608265f8 9 public:
yihui 0:26da608265f8 10 Battery(PinName pin) {
yihui 0:26da608265f8 11 uint32_t n = (uint32_t) pin;
yihui 0:26da608265f8 12 channel = 1 << (1 + n);
yihui 0:26da608265f8 13 }
yihui 0:26da608265f8 14
yihui 0:26da608265f8 15 float read() {
yihui 0:26da608265f8 16 uint32_t pre_enable_register = NRF_ADC->ENABLE;
yihui 0:26da608265f8 17 uint32_t pre_config_register = NRF_ADC->CONFIG;
yihui 0:26da608265f8 18
yihui 0:26da608265f8 19
yihui 0:26da608265f8 20 NRF_ADC->ENABLE = ADC_ENABLE_ENABLE_Enabled;
yihui 0:26da608265f8 21 NRF_ADC->CONFIG = (ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) |
yihui 0:26da608265f8 22 (ADC_CONFIG_INPSEL_AnalogInputNoPrescaling << ADC_CONFIG_INPSEL_Pos) |
yihui 0:26da608265f8 23 (ADC_CONFIG_REFSEL_VBG << ADC_CONFIG_REFSEL_Pos) |
yihui 0:26da608265f8 24 (channel << ADC_CONFIG_PSEL_Pos) |
yihui 0:26da608265f8 25 (ADC_CONFIG_EXTREFSEL_None << ADC_CONFIG_EXTREFSEL_Pos);
yihui 0:26da608265f8 26
yihui 0:26da608265f8 27 NRF_ADC->TASKS_START = 1;
yihui 0:26da608265f8 28 while (((NRF_ADC->BUSY & ADC_BUSY_BUSY_Msk) >> ADC_BUSY_BUSY_Pos) == ADC_BUSY_BUSY_Busy) {
yihui 0:26da608265f8 29 }
yihui 0:26da608265f8 30
yihui 0:26da608265f8 31 uint16_t value = NRF_ADC->RESULT;
yihui 0:26da608265f8 32
yihui 0:26da608265f8 33 NRF_ADC->ENABLE = pre_enable_register;
yihui 0:26da608265f8 34 NRF_ADC->CONFIG = pre_config_register;
yihui 0:26da608265f8 35
yihui 0:26da608265f8 36 return (float)value * (1.0f / (float)0x3FF) * 1.2 * 12.2 / 2.2;
yihui 0:26da608265f8 37 }
yihui 0:26da608265f8 38
yihui 0:26da608265f8 39 private:
yihui 0:26da608265f8 40 uint32_t channel;
yihui 0:26da608265f8 41 };
yihui 0:26da608265f8 42
yihui 0:26da608265f8 43 #endif // __BATTERY_H__