1f2180e8ff
drivers: adc: adc_sam0: fix c20 and c21 reference not setting On c20 and c21 variants, the adc_sam0 driver is failing to honor the enable-protected status of the REFCTRL register when writing the channel config's reference into it. This causes the reference to never be set when adc_sam0_channel_setup is called since the ADC is not disabled prior to the write. Fix it by adding the ADC_SAM0_REFERENCE_ENABLE_PROTECTED definition to the c20 and c21 soc.h files. This effectively disables the ADC during writes to the REFCTRL register, thus honoring the enable-protected behavior of this register. I'm assuming ADC_SAM0_REFERENCE_ENABLE_PROTECTED exists for this type of situation and therefore this was the approach taken. After making the change, I was able to verify proper ADC readings by measuring voltage on an ADC pin and observing correct values. Reverting back prior to this change, running the same test yields reading 0's. Fixes: #61975 Signed-off-by: Tristen Pierson <tpierson@bitconcepts.tech>
70 lines
2 KiB
C
70 lines
2 KiB
C
/*
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* Copyright (c) 2022 Kamil Serwus
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef _ATMEL_SAMC_SOC_H_
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#define _ATMEL_SAMC_SOC_H_
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#ifndef _ASMLANGUAGE
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#define DONT_USE_CMSIS_INIT
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#include <zephyr/types.h>
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#if defined(CONFIG_SOC_PART_NUMBER_SAMC20E15A)
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#include <samc20e15a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20E16A)
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#include <samc20e16a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20E17A)
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#include <samc20e17a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20E18A)
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#include <samc20e18a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20G15A)
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#include <samc20g15a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20G16A)
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#include <samc20g16a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20G17A)
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#include <samc20g17a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20G18A)
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#include <samc20g18a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20J15A)
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#include <samc20j15a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20J16A)
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#include <samc20j16a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20J17A)
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#include <samc20j17a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20J17AU)
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#include <samc20j17au.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20J18A)
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#include <samc20j18a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20J18AU)
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#include <samc20j18au.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20N17A)
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#include <samc20n17a.h>
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#elif defined(CONFIG_SOC_PART_NUMBER_SAMC20N18A)
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#include <samc20n18a.h>
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#else
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#error Library does not support the specified device.
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#endif
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#endif /* _ASMLANGUAGE */
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#define ADC_SAM0_REFERENCE_ENABLE_PROTECTED
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#include "adc_fixup_sam0.h"
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#include "../common/soc_port.h"
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#include "../common/atmel_sam0_dt.h"
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#define SOC_ATMEL_SAM0_OSC32K_FREQ_HZ 32768
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#define SOC_ATMEL_SAM0_OSC48M_FREQ_HZ 48000000
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/** Processor Clock (HCLK) Frequency */
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#define SOC_ATMEL_SAM0_HCLK_FREQ_HZ CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC
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/** Master Clock (MCK) Frequency */
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#define SOC_ATMEL_SAM0_MCK_FREQ_HZ SOC_ATMEL_SAM0_HCLK_FREQ_HZ
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#define SOC_ATMEL_SAM0_GCLK0_FREQ_HZ SOC_ATMEL_SAM0_MCK_FREQ_HZ
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#endif /* _ATMEL_SAMD51_SOC_H_ */
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