bissen21/Marlin_Firmware
1
0 Fork 0
Code Issues Pull Requests Projects Releases 4 Wiki Activity

Ensure ADC conversion is complete before reading (#11336)

Browse Source 
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 authored and Scott Lahteine committed 2018-07-26 03:59:19 -05:00
1 parent e2aa635e70
commit 624986d423
10 files changed
+140 -111
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

Marlin/src/HAL/HAL_LPC1768/HAL.h
+3 -1
View File
@@ -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_