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ADC: change adc.Ch() to return a float

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this gives us a bit more precision in airspeed measurement, and costs
us virtually nothing as we are converting to float immediately after
getting the value
This commit is contained in:
Andrew Tridgell 2011-12-10 21:43:57 +11:00
parent 43a53aa303
commit 47da2ec992
5 changed files with 6 additions and 6 deletions
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2
libraries/AP_ADC/AP_ADC.h
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@ -27,7 +27,7 @@ class AP_ADC
virtual void Init(AP_PeriodicProcess * scheduler = NULL) = 0;
/* read one channel value */
virtual uint16_t Ch(uint8_t ch_num) = 0;
virtual float Ch(uint8_t ch_num) = 0;
/* read 6 channels values as a set, used by IMU for 3 gyros
and 3 accelerometeres.

4
libraries/AP_ADC/AP_ADC_ADS7844.cpp
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@ -162,7 +162,7 @@ void AP_ADC_ADS7844::Init( AP_PeriodicProcess * scheduler )
}
// Read one channel value
uint16_t AP_ADC_ADS7844::Ch(uint8_t ch_num)
float AP_ADC_ADS7844::Ch(uint8_t ch_num)
{
uint16_t count;
uint32_t sum;
@ -178,7 +178,7 @@ uint16_t AP_ADC_ADS7844::Ch(uint8_t ch_num)
_sum[ch_num] = 0;
sei();
return sum/count;
return ((float)sum)/count;
}
// Read 6 channel values

2
libraries/AP_ADC/AP_ADC_ADS7844.h
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@ -24,7 +24,7 @@ class AP_ADC_ADS7844 : public AP_ADC
void Init( AP_PeriodicProcess * scheduler );
// Read 1 sensor value
uint16_t Ch(unsigned char ch_num);
float Ch(unsigned char ch_num);
// Read 6 sensors at once
uint32_t Ch6(const uint8_t *channel_numbers, uint16_t *result);

2
libraries/AP_ADC/AP_ADC_HIL.cpp
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@ -44,7 +44,7 @@ void AP_ADC_HIL::Init( AP_PeriodicProcess * scheduler )
}
// Read one channel value
uint16_t AP_ADC_HIL::Ch(unsigned char ch_num)
float AP_ADC_HIL::Ch(unsigned char ch_num)
{
return adcValue[ch_num];
}

2
libraries/AP_ADC/AP_ADC_HIL.h
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@ -32,7 +32,7 @@ class AP_ADC_HIL : public AP_ADC
///
// Read the sensor, part of public AP_ADC interface
uint16_t Ch(unsigned char ch_num);
float Ch(unsigned char ch_num);
///
// Read 6 sensors at once