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SourceVuESP-IDF Framework and ExamplesESP-IDFadc_digi_read_bytes()

adc_digi_read_bytes() function

Read bytes from Digital ADC through DMA.

Syntax

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Summary

Declaration

Definition

from adc.h:311

esp_err_t adc_digi_read_bytes(uint8_t *buf, uint32_t length_max, uint32_t *out_length, uint32_t timeout_ms);

Implemented in adc_dma_legacy.c:527

Arguments

Argument

Description

buf

Buffer to read from ADC.

length_max

Expected length of data read from the ADC.

out_length

Real length of data read from the ADC via this API.

timeout_ms

Time to wait for data via this API, in millisecond.

Return value

- ESP_ERR_INVALID_STATE Driver state is invalid. Usually it means the ADC sampling rate is faster than the task processing rate. - ESP_ERR_TIMEOUT Operation timed out - ESP_OK On success

References

Code

Location

esp_err_t adc_digi_read_bytes(uint8_t *buf, uint32_t length_max, uint32_t *out_length, uint32_t timeout_ms)

adc_dma_legacy.c:527

esp_err_t adc_digi_read_bytes(uint8_t *buf, uint32_t length_max, uint32_t *out_length, uint32_t timeout_ms);

adc.h:311

Call Tree

adc_digi_read_bytes() calls 5 functions:

adc_digi_read_bytes()

__assert_func()

esp_log_timestamp()

esp_log_write()

xRingbufferReceiveUpTo()

vRingbufferReturnItem()

Data Use

adc_digi_read_bytes() reads 9 variables:

esp_log_level_t::ESP_LOG_ERROR

esp_log_level_t::ESP_LOG_WARN

esp_log_level_t::ESP_LOG_INFO

esp_log_level_t::ESP_LOG_DEBUG

esp_log_level_t::ESP_LOG_VERBOSE

ADC_TAG

adc_digi_context_t::ringbuf_hdl

adc_digi_context_t::ringbuf_overflow_flag

s_adc_digi_ctx

adc_digi_read_bytes()

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