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/*
* Copyright (c) 2006-2025 RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2025-11-13 CYFS Add standardized utest documentation block
*/
/**
* Test Case Name: UART Blocking TX Timeout Test
*
* Test Objectives:
* - Validate blocking transmit timeout handling when RX operates non-blocking
* - Verify APIs: rt_device_find, rt_device_control(RT_SERIAL_CTRL_SET_TX_TIMEOUT / _TX_FLUSH),
* rt_device_open with RT_DEVICE_FLAG_RX_NON_BLOCKING | RT_DEVICE_FLAG_TX_BLOCKING, rt_device_write
*
* Test Scenarios:
* - **Scenario 1 (TX Timeout Sweep / tc_uart_api):**
* 1. Configure UART buffers and open the device in RX non-blocking / TX blocking mode.
* 2. Allocate a reusable TX buffer and iterate `RT_SERIAL_TC_SEND_ITERATIONS` times.
* 3. For each iteration, randomize burst length (1024~2047 bytes), set expected TX timeout,
* issue write, and ensure returned write size falls into tolerated range.
* 4. Flush TX FIFO and delay to allow loopback RX to complete reception.
*
* Verification Metrics:
* - Each write returns size within `[tx_timeout_send_size - 70, send_size - 80]`.
* - No allocation failures; all iterations exit via RT_EOK and device closes cleanly.
*
* Dependencies:
* - Requires `RT_UTEST_SERIAL_V2` enabled and loopback wiring of `RT_SERIAL_TC_DEVICE_NAME`.
* - Excludes configurations with `BSP_UART2_TX_USING_DMA` (DMA write timeout unsupported).
* - Needs random number generator and system tick for duration calculations.
*
* Expected Results:
* - Test completes without assertion failures; logs show sequence of timeout send sizes.
* - Utest framework prints `[ PASSED ] [ result ] testcase (components.drivers.serial.v2.uart_timeout_txb)`.
*/
#include <rtthread.h>
#include "utest.h"
#include <rtdevice.h>
#include <stdlib.h>
#ifdef RT_UTEST_SERIAL_V2
#ifndef BSP_UART2_TX_USING_DMA
static struct rt_serial_device *serial;
static rt_err_t uart_find(void)
{
serial = (struct rt_serial_device *)rt_device_find(RT_SERIAL_TC_DEVICE_NAME);
if (serial == RT_NULL)
{
LOG_E("find %s device failed!\n", RT_SERIAL_TC_DEVICE_NAME);
return -RT_ERROR;
}
return RT_EOK;
}
static rt_err_t tx_timeout_test_item(rt_uint8_t *uart_write_buffer, rt_uint32_t send_size)
{
rt_uint32_t readSize = 0;
rt_int32_t tx_timeout_send_size = send_size - send_size / 3;
rt_int32_t tx_timeout = rt_tick_from_millisecond(0.0868 * tx_timeout_send_size + 1);
rt_device_control(&serial->parent, RT_SERIAL_CTRL_SET_TX_TIMEOUT, (void *)&tx_timeout);
rt_ssize_t size = rt_device_write(&serial->parent, 0, uart_write_buffer, send_size);
if (size < (tx_timeout_send_size - 70) || size > (send_size - 80))
{
LOG_E("size [%4d], send_size [%4d]", size, tx_timeout_send_size);
return -RT_ERROR;
}
rt_device_control(&serial->parent, RT_SERIAL_CTRL_TX_FLUSH, RT_NULL);
/* Waiting for rx to complete reception */
rt_thread_mdelay(0.0868 * (send_size / 3));
LOG_I("tx timeout send_size [%4d]", send_size);
return RT_EOK;
}
static rt_bool_t uart_api()
{
rt_err_t result = RT_EOK;
result = uart_find();
if (result != RT_EOK)
{
return RT_FALSE;
}
/* Reinitialize */
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
config.baud_rate = BAUD_RATE_115200;
config.rx_bufsz = RT_SERIAL_TC_RXBUF_SIZE;
config.tx_bufsz = RT_SERIAL_TC_TXBUF_SIZE;
rt_device_control(&serial->parent, RT_DEVICE_CTRL_CONFIG, &config);
result = rt_device_open(&serial->parent, RT_DEVICE_FLAG_RX_NON_BLOCKING | RT_DEVICE_FLAG_TX_BLOCKING);
if (result != RT_EOK)
{
LOG_E("Open uart device failed.");
return RT_FALSE;
}
rt_uint8_t *uart_write_buffer;
rt_uint32_t i;
uart_write_buffer = (rt_uint8_t *)rt_malloc(2048);
for (i = 0; i < RT_SERIAL_TC_SEND_ITERATIONS; i++)
{
srand(rt_tick_get());
if (RT_EOK != tx_timeout_test_item(uart_write_buffer, 1024 + (rand() % 1024)))
{
LOG_E("test_item failed.");
result = -RT_ERROR;
goto __exit;
}
}
__exit:
rt_free(uart_write_buffer);
rt_device_close(&serial->parent);
rt_thread_mdelay(5);
return result == RT_EOK ? RT_TRUE : RT_FALSE;
}
static void tc_uart_api(void)
{
uassert_true(uart_api() == RT_TRUE);
}
static rt_err_t utest_tc_init(void)
{
LOG_I("UART TEST: Please connect Tx and Rx directly for self testing.");
return RT_EOK;
}
static rt_err_t utest_tc_cleanup(void)
{
rt_device_t uart_dev = rt_device_find(RT_SERIAL_TC_DEVICE_NAME);
while (rt_device_close(uart_dev) != -RT_ERROR);
return RT_EOK;
}
static void testcase(void)
{
UTEST_UNIT_RUN(tc_uart_api);
}
UTEST_TC_EXPORT(testcase, "components.drivers.serial.v2.uart_timeout_txb", utest_tc_init, utest_tc_cleanup, 30);
#endif /* BSP_UART2_TX_USING_DMA */
#endif /* TC_UART_USING_TC */
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