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Ensure ADC conversion is complete before reading (#11336)

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The current Marlin implementation relies on a timer interrupt to start the ADC conversion and read it. However in some circumstances the interrupt can be delayed resulting in insufficient time being available for the ADC conversion. This results in a bad reading and false temperature fluctuations. These changes make sure that the conversion is complete (by checking the ADC hardware via the HAL) before reading a value.

See: https://github.com/MarlinFirmware/Marlin/issues/11323
This commit is contained in:
Andy Shaw
2018-07-26 09:59:19 +01:00
committed by Scott Lahteine
parent e2aa635e70
commit 624986d423
10 changed files with 140 additions and 111 deletions
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4
Marlin/src/HAL/HAL_LPC1768/HAL.h
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@ -140,11 +140,13 @@ uint8_t spiRec(uint32_t chan);
// ADC
#define HAL_ANALOG_SELECT(pin) HAL_adc_enable_channel(pin)
#define HAL_START_ADC(pin) HAL_adc_start_conversion(pin)
#define HAL_READ_ADC HAL_adc_get_result()
#define HAL_READ_ADC() HAL_adc_get_result()
#define HAL_ADC_READY() HAL_adc_finished()
void HAL_adc_init(void);
void HAL_adc_enable_channel(int pin);
void HAL_adc_start_conversion(const uint8_t adc_pin);
uint16_t HAL_adc_get_result(void);
bool HAL_adc_finished(void);
#endif // _HAL_LPC1768_H_