espressif/esp-idf
1
0
Fork 1
mirror of https://github.com/espressif/esp-idf.git synced 2026-05-19 23:45:28 +02:00
Code Issues Packages Projects Releases Wiki Activity

esp_adc_cal: Added ADC calibration component

Browse Source 
Added component containg API that is able to correct raw ADC readings
into a voltage in mV. Also provided a helper function that combines
the process of getting the raw ADC1 reading then converting it to a
voltage in mV. In doing so, the adc1_get_voltage() function of the ADC
driver has been deprecated. Instead there is now adc1_get_raw to obtain
the raw ADC1 reading, and adc1_to_voltage() that gets the raw reading
and converts all in one function. Functions using the deprecated
adc1_get_voltage() have also been updated to use adc1_get_raw().

Conversion is based on ADC characteristics. The characteristics are based
on the ADC's v_ref, herefore the appropriate structure and functions have
been provided to obtain the ADC characteristics.

The existing ADC driver has also been modified by adding a function to
route the internal ADC reference voltage to a GPIO allowing users to measure
it manually.

Relevant documentation has also been updated
This commit is contained in:
Darian Leung
2017-08-07 21:33:01 +08:00
parent 84dec4459b
commit 88b05f9391
12 changed files with 542 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files
examples/system/app_trace_to_host/README.md
+1 -1
View File
@@ -18,7 +18,7 @@ int sampling_period = 20;
int i = 0;
uint32_t sampling_start = esp_log_timestamp(); //this clock counts miliseconds
do {
ESP_LOGI(TAG, "Sample:%d, Value:%d", ++i, adc1_get_voltage(ADC1_TEST_CHANNEL));
ESP_LOGI(TAG, "Sample:%d, Value:%d", ++i, adc1_get_raw(ADC1_TEST_CHANNEL));
} while (esp_log_timestamp() - sampling_start < sampling_period);
```
examples/system/app_trace_to_host/main/app_trace_to_host_test.c
+1 -1
View File
@@ -87,7 +87,7 @@ int adc1_sample_and_show(int sampling_period)
int i = 0;
uint32_t sampling_start = esp_log_timestamp();
do {
ESP_LOGI(TAG, "Sample:%d, Value:%d", ++i, adc1_get_voltage(ADC1_TEST_CHANNEL));
ESP_LOGI(TAG, "Sample:%d, Value:%d", ++i, adc1_get_raw(ADC1_TEST_CHANNEL));
} while (esp_log_timestamp() - sampling_start < sampling_period);
return i;
}