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92 lines
3.3 KiB
C
92 lines
3.3 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "drivers/stm32f2/rtc_calibration.h"
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#include "clar.h"
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// Stubs and stuff
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#include "stubs_logging.h"
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#include "mcu.h"
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#define TARGET_FREQUENCY_mHZ (32768 * 1000)
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#define ALTERNATE_FREQUENCY_mHZ (1000000 * 1000)
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// Tests
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void test_rtc_calibration__no_calibration_required(void) {
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RTCCalibConfig config = rtc_calibration_get_config(32768000, TARGET_FREQUENCY_mHZ);
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cl_assert_equal_i(config.units, 0);
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}
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void test_rtc_calibration__slightly_slow_but_not_enough_to_calibrate(void) {
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// Approximately -2.01ppm
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RTCCalibConfig config = rtc_calibration_get_config(32767934, TARGET_FREQUENCY_mHZ);
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cl_assert_equal_i(config.units, 0);
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}
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void test_rtc_calibration__just_slow_enough_to_calibrate(void) {
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// Approximately -2.04ppm
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RTCCalibConfig config = rtc_calibration_get_config(32767933, TARGET_FREQUENCY_mHZ);
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cl_assert_equal_i(config.units, 1);
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cl_assert_equal_i(config.sign, RTC_CalibSign_Positive);
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}
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void test_rtc_calibration__slightly_fast_but_not_enough_to_calibrate(void) {
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// Approximately +1.01ppm
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RTCCalibConfig config = rtc_calibration_get_config(32768033, TARGET_FREQUENCY_mHZ);
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cl_assert_equal_i(config.units, 0);
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}
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void test_rtc_calibration__just_fast_enough_to_calibrate(void) {
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// Approximately +1.04ppm
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RTCCalibConfig config = rtc_calibration_get_config(32768034, TARGET_FREQUENCY_mHZ);
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cl_assert_equal_i(config.units, 1);
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cl_assert_equal_i(config.sign, RTC_CalibSign_Negative);
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}
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void test_rtc_calibration__out_of_bounds_slow(void) {
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// Approximately -130ppm
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RTCCalibConfig config = rtc_calibration_get_config(32763740, TARGET_FREQUENCY_mHZ);
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cl_assert_equal_i(config.units, 31);
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cl_assert_equal_i(config.sign, RTC_CalibSign_Positive);
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}
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void test_rtc_calibration__out_of_bounds_fast(void) {
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// Approximately +70ppm
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RTCCalibConfig config = rtc_calibration_get_config(32770294, TARGET_FREQUENCY_mHZ);
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cl_assert_equal_i(config.units, 31);
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cl_assert_equal_i(config.sign, RTC_CalibSign_Negative);
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}
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void test_rtc_calibration__different_target_frequency_not_fast_enough(void) {
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// Approximately +1.017ppm
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RTCCalibConfig config = rtc_calibration_get_config(1000001017, ALTERNATE_FREQUENCY_mHZ);
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cl_assert_equal_i(config.units, 0);
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}
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void test_rtc_calibration__different_target_frequency_just_fast_enough(void) {
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// Approximately +1.018ppm
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RTCCalibConfig config = rtc_calibration_get_config(1000001018, ALTERNATE_FREQUENCY_mHZ);
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cl_assert_equal_i(config.units, 1);
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cl_assert_equal_i(config.sign, RTC_CalibSign_Negative);
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}
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void test_rtc_calibration__invalid_frequency(void) {
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// Bigboards don't have a frequency stored in their mfg info registry.
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RTCCalibConfig config = rtc_calibration_get_config(0, TARGET_FREQUENCY_mHZ);
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cl_assert_equal_i(config.units, 0);
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}
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