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driver: improve gpio glitch filter test

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on esp32c6 and esp32h2, CPU frequency is 2x of IO MUX clock source.
There is a possiblity for a too short glitch pulse can't trigger GPIO
interrupt.
This commit is contained in:
morris 2023-02-22 18:54:15 +08:00
parent b184b9a153
commit fdac2589bb
1 changed files with 12 additions and 5 deletions
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17
components/driver/test_apps/gpio_extensions/main/test_gpio_filter.c
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@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -90,8 +90,11 @@ static void test_gpio_intr_callback(void *args)
NOINLINE_ATTR IRAM_ATTR static void test_gpio_simulate_glitch_pulse(void)
{
// the following code is used to generate a short glitch pulse
// around 10ns @CPU160MHz
// around 20ns @CPU160MHz, 40ns @CPU96MHz
// pull high for 4 CPU cycles, to ensure the short pulse can be sampled by GPIO
asm volatile(
"csrrsi zero, %0, 0x1\n"
"csrrsi zero, %0, 0x1\n"
"csrrsi zero, %0, 0x1\n"
"csrrsi zero, %0, 0x1\n"
"csrrci zero, %0, 0x1"
@ -101,7 +104,7 @@ NOINLINE_ATTR IRAM_ATTR static void test_gpio_simulate_glitch_pulse(void)
TEST_CASE("GPIO flex glitch filter enable/disable", "[gpio_filter]")
{
const gpio_num_t test_gpio = 0;
const gpio_num_t test_gpio = 2;
printf("initialize GPIO for input and out\r\n");
gpio_config_t gpio_cfg = {
@ -132,15 +135,19 @@ TEST_CASE("GPIO flex glitch filter enable/disable", "[gpio_filter]")
.window_width_ns = 500,
};
TEST_ESP_OK((gpio_new_flex_glitch_filter(&filter_cfg, &filter)));
TEST_ESP_OK(gpio_glitch_filter_enable(filter));
printf("install gpio interrupt\r\n");
gpio_install_isr_service(0);
SemaphoreHandle_t sem = xSemaphoreCreateBinary();
TEST_ESP_OK(gpio_isr_handler_add(test_gpio, test_gpio_intr_callback, sem));
printf("enable the glitch filter\r\n");
TEST_ESP_OK(gpio_glitch_filter_enable(filter));
printf("generate rising edge glitch signal\r\n");
test_gpio_simulate_glitch_pulse();
for (int i = 0; i < 10; i++) {
test_gpio_simulate_glitch_pulse();
}
// should timeout, because the glitch is filtered out
TEST_ASSERT_EQUAL(pdFALSE, xSemaphoreTake(sem, pdMS_TO_TICKS(1000)));