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Use native ADC resolution where possible (#15719)

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This commit is contained in:
LinFor
2019-11-07 02:49:17 +03:00
committed by Scott Lahteine
parent 9201197878
commit a84e3d1b80
17 changed files with 77 additions and 43 deletions
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7
Marlin/src/HAL/HAL_LPC1768/HAL.h
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@ -131,11 +131,14 @@ int freeMemory();
// K = 6, 565 samples, 500Hz sample rate, 1.13s convergence on full range step
// Memory usage per ADC channel (bytes): 4 (32 Bytes for 8 channels)
using FilteredADC = LPC176x::ADC<ADC_LOWPASS_K_VALUE, ADC_MEDIAN_FILTER_SIZE>;
#define HAL_ADC_RESULT_BITS 12 // 15 bit maximum, raw temperature is stored as int16_t
#define HAL_ADC_FILTERED // Disable oversampling done in Marlin as ADC values already filtered in HAL
#define HAL_ADC_RESOLUTION HAL_ADC_RESULT_BITS
using FilteredADC = LPC176x::ADC<ADC_LOWPASS_K_VALUE, ADC_MEDIAN_FILTER_SIZE>;
extern uint32_t HAL_adc_reading;
[[gnu::always_inline]] inline void HAL_start_adc(const pin_t pin) {
HAL_adc_reading = FilteredADC::read(pin) >> 6; // returns 16bit value, reduce to 10bit
HAL_adc_reading = FilteredADC::read(pin) >> (16 - HAL_ADC_RESULT_BITS); // returns 16bit value, reduce to required bits
}
[[gnu::always_inline]] inline uint16_t HAL_read_adc() {
return HAL_adc_reading;