51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
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#include <stdio.h>
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#include <math.h>
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#include "unity.h"
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#include "driver/adc.h"
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#include <time.h>
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#include <sys/time.h>
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#include "soc/rtc_cntl_reg.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/semphr.h"
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#include "sdkconfig.h"
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// https://github.com/espressif/arduino-esp32/issues/120
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TEST_CASE("Reading RTC registers on APP CPU doesn't affect clock", "[newlib]")
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{
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// This runs on APP CPU:
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void time_adc_test_task(void* arg)
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{
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for (int i = 0; i < 200000; ++i) {
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// wait for 20us, reading one of RTC registers
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uint32_t ccount = xthal_get_ccount();
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while (xthal_get_ccount() - ccount < 20 * CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ) {
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volatile uint32_t val = REG_READ(RTC_CNTL_STATE0_REG);
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(void) val;
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}
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}
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SemaphoreHandle_t * p_done = (SemaphoreHandle_t *) arg;
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xSemaphoreGive(*p_done);
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vTaskDelay(1);
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vTaskDelete(NULL);
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}
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SemaphoreHandle_t done = xSemaphoreCreateBinary();
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xTaskCreatePinnedToCore(&time_adc_test_task, "time_adc", 4096, &done, 5, NULL, 1);
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// This runs on PRO CPU:
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for (int i = 0; i < 4; ++i) {
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struct timeval tv_start;
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gettimeofday(&tv_start, NULL);
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vTaskDelay(1000/portTICK_PERIOD_MS);
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struct timeval tv_stop;
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gettimeofday(&tv_stop, NULL);
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float time_sec = tv_stop.tv_sec - tv_start.tv_sec + 1e-6f * (tv_stop.tv_usec - tv_start.tv_usec);
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printf("(0) time taken: %f sec\n", time_sec);
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TEST_ASSERT_TRUE(fabs(time_sec - 1.0f) < 0.1);
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}
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TEST_ASSERT_TRUE(xSemaphoreTake(done, 5000 / portTICK_RATE_MS));
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}
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