fix(uart): Fixed issue that TX be blocked by auto-lightsleep

components/driver/test_apps/uart/main/test_uart_auto_lightsleep.c

@@ -0,0 +1,80 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "sdkconfig.h"
+#include "unity.h"
+#include "driver/uart.h"
+#include "esp_pm.h"
+#include "esp_log.h"
+
+#define UART_TAG         "Uart"
+#define TEST_BUF_SIZE    256
+
+//This should be larger than FIFO_SIZE + 2 * TEST_DRIVER_BUF_SIZE, so that blocking will happen
+#define TEST_WRITE_SIZE 1024
+
+#define TEST_TXD   12
+#define TEST_RXD   13
+#define TEST_RTS   UART_PIN_NO_CHANGE
+#define TEST_CTS   UART_PIN_NO_CHANGE
+
+#define TEST_UART_PORT_NUM      1
+#define TEST_UART_BAUD_RATE     115200
+
+#define MAX_FREQ    (CONFIG_ESP_DEFAULT_CPU_FREQ_MHZ)
+
+#if CONFIG_XTAL_FREQ_40
+#define MIN_FREQ    10
+#elif CONFIG_XTAL_FREQ_32
+#define MIN_FREQ    8
+#elif CONFIG_XTAL_FREQ_26
+#define MIN_FREQ    13
+#endif
+
+#if CONFIG_PM_ENABLE
+
+TEST_CASE("uart tx won't be blocked by auto light sleep", "[uart]")
+{
+    // Configure dynamic frequency scaling:
+    // maximum and minimum frequencies are set in sdkconfig,
+    // automatic light sleep is enabled if tickless idle support is enabled.
+    esp_pm_config_t pm_config = {
+        .max_freq_mhz = MAX_FREQ,
+        .min_freq_mhz = MIN_FREQ,
+#if CONFIG_FREERTOS_USE_TICKLESS_IDLE
+        .light_sleep_enable = true
+#endif
+    };
+    TEST_ESP_OK(esp_pm_configure(&pm_config));
+
+    uart_config_t uart_config = {
+        .baud_rate = TEST_UART_BAUD_RATE,
+        .data_bits = UART_DATA_8_BITS,
+        .parity    = UART_PARITY_DISABLE,
+        .stop_bits = UART_STOP_BITS_1,
+        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
+        .source_clk = UART_SCLK_DEFAULT,
+    };
+    int intr_alloc_flags = 0;
+
+    TEST_ESP_OK(uart_driver_install(TEST_UART_PORT_NUM, TEST_BUF_SIZE, 0, 0, NULL, intr_alloc_flags));
+    TEST_ESP_OK(uart_param_config(TEST_UART_PORT_NUM, &uart_config));
+    TEST_ESP_OK(uart_set_pin(TEST_UART_PORT_NUM, TEST_TXD, TEST_RXD, TEST_RTS, TEST_CTS));
+
+    // Configure a temporary buffer for the incoming data
+    const int len = TEST_WRITE_SIZE;
+    uint8_t *data = (uint8_t *) malloc(len);
+
+    //If auto lightsleep happen, there will be deadlock in either one of the two following functions
+    uart_write_bytes(TEST_UART_PORT_NUM, (const char *) data, len);
+    uart_wait_tx_done(TEST_UART_PORT_NUM, portMAX_DELAY);
+
+    ESP_LOGI(UART_TAG, "return from uart_write_bytes");
+
+    uart_driver_delete(TEST_UART_PORT_NUM);
+    free(data);
+}
+#endif // CONFIG_PM_ENABLE