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/* Copyright (c) 2023, Canaan Bright Sight Co., Ltd
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 2006-2025 RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <unistd.h>
#include <stdio.h>
#include <drivers/dev_pwm.h>
#include "drv_pwm.h"
#include "drv_pinctrl.h"
#include <rtdbg.h>
#include "utest.h"
/*
* 测试 PWM 驱动对板载 LED 的亮度控制功能
*
* 1. 查找名为 "pwm" 的 PWM 设备。
* 2. 使用 pinctrl 将 GPIO52 映射为 PWM4 通道，并配置引脚属性：
* - 使能输出（OE）；
* - 禁用输入（IE）；
* - 禁用上下拉（PU/PD）；
* - 设置中等驱动能力（驱动强度为 4）。
* 3. 设置 PWM 输出周期为 100000ns（对应频率为 10kHz）。
* 4. 通过逐步增加 PWM 的脉冲宽度（pulse），控制板载 LED 的亮度由暗到亮：
* - 从 10% 占空比（10000ns）开始；
* - 每次增加 10%，直到 100%（全亮）；
* - 每次间隔 2 秒以便观察 LED 亮度变化。
* 5. 最后禁用 PWM 输出，关闭 LED。
*
* 硬件说明：
* - 本测试基于 K230-01studio 开发板；
* - GPIO52 已通过电路连接一颗板载 LED；
* - PWM4 通道控制该 LED 的亮灭和亮度；
* - 测试过程中，可肉眼观察 LED 明暗变化。
*
*/
#define PWM_DEV_NAME "pwm1" /* PWM设备名称 */
#define PWM_DEV_CHANNEL 1 /* PWM通道 */
#define TEST_GPIO_LED 52
void pwm_demo(void)
{
LOG_I("set gpio52 in PWM1 start.\n");
k230_pinctrl_set_function(TEST_GPIO_LED, IOMUX_FUNC3);
/* 使能输出 */
k230_pinctrl_set_oe(TEST_GPIO_LED, 1);
/* 禁止输入 */
k230_pinctrl_set_ie(TEST_GPIO_LED, 0);
/* 禁止上拉 */
k230_pinctrl_set_pu(TEST_GPIO_LED, 0);
/* 禁止下拉 */
k230_pinctrl_set_pd(TEST_GPIO_LED, 0);
/* 设置驱动能力为4（中等强度） */
k230_pinctrl_set_drv(TEST_GPIO_LED, 4);
LOG_I("pwm test start.\n");
struct rt_device_pwm *pwm_dev; /* PWM设备句柄 */
rt_uint32_t period; /* 周期, 单位为纳秒ns */
rt_uint32_t pulse; /* PWM脉冲宽度值, 单位为纳秒ns */
rt_err_t ret;
/* 查找设备 */
pwm_dev = (struct rt_device_pwm *)rt_device_find(PWM_DEV_NAME);
uassert_not_null(pwm_dev);
/* 设置PWM周期和脉冲宽度 */
period = 100000; /* PWM 周期：100000ns = 100us，即 10kHz */
/* 逐步循环提高PWM脉冲宽度 */
for(pulse = 10000; pulse <= 100000; pulse+=10000)
{
ret = rt_pwm_set(pwm_dev, PWM_DEV_CHANNEL, period, pulse);
uassert_int_equal(ret, RT_EOK);
ret = rt_pwm_enable(pwm_dev, PWM_DEV_CHANNEL);
uassert_int_equal(ret, RT_EOK);
sleep(2);
}
ret = rt_pwm_disable(pwm_dev, PWM_DEV_CHANNEL);
uassert_int_equal(ret, RT_EOK);
}
static void pwm_testcase(void)
{
UTEST_UNIT_RUN(pwm_demo);
}
static rt_err_t utest_tc_init(void)
{
return RT_EOK;
}
static rt_err_t utest_tc_cleanup(void)
{
return RT_EOK;
}
UTEST_TC_EXPORT(pwm_testcase, "bsp.k230.drivers.pwm", utest_tc_init, utest_tc_cleanup, 10);
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