src/rp2_common/hardware_adc/adc.c (PicoSDK)

/* * Copyright (c) 2020 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause */ #include "pico.h" #include "hardware/adc.h" #include "hardware/resets.h" void adc_init(void) { // ADC is in an unknown state. We should start by resetting it reset_unreset_block_num_wait_blocking(RESET_ADC); // Now turn it back on. Staging of clock etc is handled internally adc_hw->cs = ADC_CS_EN_BITS; // Internal staging completes in a few cycles, but poll to be sure while (!(adc_hw->cs & ADC_CS_READY_BITS)) { tight_loop_contents(); } }