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Provide overridable default ADC Full scale Voltage and Scaling factors

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This add the ability to override the defaults ADC values by
   defining values in board_config.h
This commit is contained in:
David Sidrane
2017-01-13 13:35:55 -10:00
committed by Lorenz Meier
parent 43c1237d00
commit a5ec920756
1 changed files with 34 additions and 0 deletions
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src/drivers/boards/common/board_common.h
+34
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@@ -92,12 +92,46 @@
#define PX4_SPI_BUS_ID(bd) (((bd) >> 4) & 0xf)
#define PX4_SPI_DEV_ID(bd) ((bd) & 0xf)
/* ADC defining tools
* We want to normalize the V5 Sensing to V = (adc_dn) * ADC_V5_V_FULL_SCALE/(2 ^ ADC_BITS) * ADC_V5_SCALE)
*/
/* Provide overrideable defaults ADC Full scale ranges and Divider ratios
* If the board has a different ratio or full scale range for any voltage sensing
* the board_congig.h file should define the constants that differ from these
* defaults
*/
#if !defined(ADC_V5_V_FULL_SCALE)
#define ADC_V5_V_FULL_SCALE (6.6f) // 5 volt Rail full scale voltage
#endif
#if !defined(ADC_V5_SCALE)
#define ADC_V5_SCALE (2.0f) // The scale factor defined by HW's resistive divider (Rt+Rb)/ Rb
#endif
#if !defined(ADC_3V3_V_FULL_SCALE)
#define ADC_3V3_V_FULL_SCALE (3.6f) // 3.3V volt Rail full scale voltage
#endif
#if !defined(ADC_3V3_SCALE)
#define ADC_3V3_SCALE (2.0f) // The scale factor defined by HW's resistive divider (Rt+Rb)/ Rb
#endif
/* Choose the source for ADC_SCALED_V5_SENSE */
#if defined(ADC_5V_RAIL_SENSE)
#define ADC_SCALED_V5_SENSE ADC_5V_RAIL_SENSE
#else
# if defined(ADC_SCALED_V5)
# define ADC_SCALED_V5_SENSE ADC_SCALED_V5
# endif
#endif
/* Provide an overridable default nop
* for BOARD_EEPROM_WP_CTRL
*/
#if !defined(BOARD_EEPROM_WP_CTRL)
# define BOARD_EEPROM_WP_CTRL(on_true)
#endif
/************************************************************************************
* Private Functions
************************************************************************************/