267 lines
6.8 KiB
C
267 lines
6.8 KiB
C
/**************************************************************************//**
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*
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* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2021-02-04 klcheng First version
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*
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******************************************************************************/
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#include <rtconfig.h>
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#if defined(BSP_USING_PWM)
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#define LOG_TAG "drv.pwm"
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#define DBG_ENABLE
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#define DBG_SECTION_NAME LOG_TAG
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#define DBG_LEVEL DBG_INFO
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#define DBG_COLOR
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#include <rtdbg.h>
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#include <stdint.h>
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#include <rtdevice.h>
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#include <rthw.h>
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#include "NuMicro.h"
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enum
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{
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PWM_START = -1,
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#if defined(BSP_USING_PWM0)
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PWM0_IDX,
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#endif
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#if defined(BSP_USING_PWM1)
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PWM1_IDX,
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#endif
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PWM_CNT
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};
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struct nu_pwm
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{
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struct rt_device_pwm dev;
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char *name;
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PWM_T *pwm_base;
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rt_int32_t pwm_period_time;
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};
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typedef struct nu_pwm *nu_pwm_t;
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static struct nu_pwm nu_pwm_arr [] =
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{
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#if defined(BSP_USING_PWM0)
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{
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.name = "pwm0",
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.pwm_base = PWM0,
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},
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#endif
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#if defined(BSP_USING_PWM1)
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{
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.name = "pwm1",
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.pwm_base = PWM1,
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},
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#endif
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{0}
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}; /* pwm nu_pwm */
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static rt_err_t nu_pwm_control(struct rt_device_pwm *device, int cmd, void *arg);
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static struct rt_pwm_ops nu_pwm_ops =
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{
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.control = nu_pwm_control
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};
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static rt_err_t nu_pwm_enable(struct rt_device_pwm *device, struct rt_pwm_configuration *configuration, rt_bool_t enable)
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{
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rt_err_t result = RT_EOK;
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PWM_T *pwm_base = ((nu_pwm_t)device)->pwm_base;
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rt_uint32_t pwm_channel = ((struct rt_pwm_configuration *)configuration)->channel;
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if (enable == RT_TRUE)
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{
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PWM_EnableOutput(pwm_base, 1 << pwm_channel);
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PWM_Start(pwm_base, 1 << pwm_channel);
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}
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else
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{
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PWM_DisableOutput(pwm_base, 1 << pwm_channel);
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PWM_ForceStop(pwm_base, 1 << pwm_channel);
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}
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return result;
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}
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static rt_err_t nu_pwm_set(struct rt_device_pwm *device, struct rt_pwm_configuration *configuration)
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{
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if ((((struct rt_pwm_configuration *)configuration)->period) <= 0)
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return -(RT_ERROR);
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rt_uint8_t pwm_channel_pair;
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rt_uint32_t pwm_freq, pwm_dutycycle ;
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PWM_T *pwm_base = ((nu_pwm_t)device)->pwm_base;
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rt_uint8_t pwm_channel = ((struct rt_pwm_configuration *)configuration)->channel;
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rt_uint32_t pwm_period = ((struct rt_pwm_configuration *)configuration)->period;
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rt_uint32_t pwm_pulse = ((struct rt_pwm_configuration *)configuration)->pulse;
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//rt_uint32_t pre_pwm_prescaler = PWM_GET_PRESCALER(pwm_base, pwm_channel);
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if ((pwm_channel % 2) == 0)
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pwm_channel_pair = pwm_channel + 1;
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else
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pwm_channel_pair = pwm_channel - 1;
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if (PWM_GET_CNR(pwm_base, pwm_channel_pair!= 0))
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{
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pwm_period = ((nu_pwm_t)device)->pwm_period_time;
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LOG_I("%s output frequency is determined, user can only change the duty\n", ((nu_pwm_t)device)->name);
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}
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else
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{
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((nu_pwm_t)device)->pwm_period_time = pwm_period;
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}
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pwm_freq = 1000000000 / pwm_period;
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pwm_dutycycle = (pwm_pulse * 100) / pwm_period;
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PWM_ConfigOutputChannel(pwm_base, pwm_channel, pwm_freq, pwm_dutycycle) ;
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return RT_EOK;
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}
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static rt_uint32_t nu_pwm_clksr(struct rt_device_pwm *device)
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{
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rt_uint32_t u32Src, u32PWMClockSrc;
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PWM_T *pwm_base = ((nu_pwm_t)device)->pwm_base;
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if (pwm_base == PWM0)
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{
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u32Src = CLK->CLKSEL2 & CLK_CLKSEL2_PWM0SEL_Msk;
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}
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else /* (pwm == PWM1) */
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{
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u32Src = CLK->CLKSEL2 & CLK_CLKSEL2_PWM1SEL_Msk;
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}
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if (u32Src == 0U)
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{
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/* clock source is from PLL clock */
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u32PWMClockSrc = CLK_GetPLLClockFreq();
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}
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else
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{
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/* clock source is from PCLK */
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SystemCoreClockUpdate();
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if (pwm_base == PWM0)
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{
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u32PWMClockSrc = CLK_GetPCLK0Freq();
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}
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else /* (pwm == PWM1) */
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{
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u32PWMClockSrc = CLK_GetPCLK1Freq();
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}
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}
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return u32PWMClockSrc;
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}
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static rt_err_t nu_pwm_get(struct rt_device_pwm *device, struct rt_pwm_configuration *configuration)
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{
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rt_uint32_t pwm_real_period, pwm_real_duty, time_tick, u32PWMClockSrc ;
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PWM_T *pwm_base = ((nu_pwm_t)device)->pwm_base;
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rt_uint32_t pwm_channel = ((struct rt_pwm_configuration *)configuration)->channel;
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rt_uint32_t pwm_prescale = PWM_GET_PRESCALER(pwm_base, pwm_channel);
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rt_uint32_t pwm_period = PWM_GET_CNR(pwm_base, pwm_channel);
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rt_uint32_t pwm_pulse = PWM_GET_CMR(pwm_base, pwm_channel);
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u32PWMClockSrc = nu_pwm_clksr(device);
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time_tick = 1000000000000 / u32PWMClockSrc;
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pwm_real_period = (((pwm_prescale + 1) * (pwm_period + 1)) * time_tick) / 1000;
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pwm_real_duty = (((pwm_prescale + 1) * pwm_pulse * time_tick)) / 1000;
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((struct rt_pwm_configuration *)configuration)->period = pwm_real_period;
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((struct rt_pwm_configuration *)configuration)->pulse = pwm_real_duty;
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LOG_I("%s %d %d %d\n", ((nu_pwm_t)device)->name, configuration->channel, configuration->period, configuration->pulse);
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return RT_EOK;
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}
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static rt_err_t nu_pwm_control(struct rt_device_pwm *device, int cmd, void *arg)
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{
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struct rt_pwm_configuration *configuration = (struct rt_pwm_configuration *)arg;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(configuration != RT_NULL);
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if (((((struct rt_pwm_configuration *)configuration)->channel) + 1) > PWM_CHANNEL_NUM)
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return -(RT_ERROR);
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switch (cmd)
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{
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case PWM_CMD_ENABLE:
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return nu_pwm_enable(device, configuration, RT_TRUE);
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case PWM_CMD_DISABLE:
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return nu_pwm_enable(device, configuration, RT_FALSE);
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case PWM_CMD_SET:
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return nu_pwm_set(device, configuration);
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case PWM_CMD_GET:
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return nu_pwm_get(device, configuration);
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}
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return -(RT_EINVAL);
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}
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int rt_hw_pwm_init(void)
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{
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rt_err_t ret;
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int i;
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for (i = (PWM_START + 1); i < PWM_CNT; i++)
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{
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ret = rt_device_pwm_register(&nu_pwm_arr[i].dev, nu_pwm_arr[i].name, &nu_pwm_ops, RT_NULL);
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RT_ASSERT(ret == RT_EOK);
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}
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return 0;
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}
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INIT_DEVICE_EXPORT(rt_hw_pwm_init);
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#ifdef RT_USING_FINSH
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#include <finsh.h>
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#ifdef FINSH_USING_MSH
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static int xpwm_get(int argc, char **argv)
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{
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int result = 0;
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struct rt_device_pwm *device = RT_NULL;
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struct rt_pwm_configuration configuration = {0};
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if (argc != 3)
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{
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rt_kprintf("Usage: pwm_get pwm1 1\n");
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result = -RT_ERROR;
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goto _exit;
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}
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device = (struct rt_device_pwm *)rt_device_find(argv[1]);
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if (!device)
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{
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result = -RT_EIO;
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goto _exit;
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}
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configuration.channel = atoi(argv[2]);
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result = rt_device_control(&device->parent, PWM_CMD_GET, &configuration);
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_exit:
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return result;
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}
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MSH_CMD_EXPORT(xpwm_get, xpwm_get <pwm_dev> <channel>);
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#endif /* FINSH_USING_MSH */
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#endif /* RT_USING_FINSH */
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#endif
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