221 lines
5.8 KiB
C
221 lines
5.8 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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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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* 2021-10-25 KevinXu first version
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*/
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#include "drv_pwm.h"
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#ifdef BSP_USING_PWM
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/* Declare the control function first */
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static rt_err_t drv_pwm_control(struct rt_device_pwm *, int, void *);
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static struct rt_pwm_ops drv_ops =
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{
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drv_pwm_control
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};
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static struct ra_pwm ra6m4_pwm_obj[BSP_PWMS_NUM] =
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{
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#ifdef BSP_USING_PWM0
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[BSP_PWM0_INDEX] = PWM_DRV_INITIALIZER(0),
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#endif
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#ifdef BSP_USING_PWM1
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[BSP_PWM1_INDEX] = PWM_DRV_INITIALIZER(1),
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#endif
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#ifdef BSP_USING_PWM2
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[BSP_PWM2_INDEX] = PWM_DRV_INITIALIZER(2),
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#endif
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#ifdef BSP_USING_PWM3
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[BSP_PWM3_INDEX] = PWM_DRV_INITIALIZER(3),
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#endif
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#ifdef BSP_USING_PWM4
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[BSP_PWM4_INDEX] = PWM_DRV_INITIALIZER(4),
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#endif
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#ifdef BSP_USING_PWM5
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[BSP_PWM5_INDEX] = PWM_DRV_INITIALIZER(5),
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#endif
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#ifdef BSP_USING_PWM6
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[BSP_PWM6_INDEX] = PWM_DRV_INITIALIZER(6),
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#endif
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#ifdef BSP_USING_PWM7
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[BSP_PWM7_INDEX] = PWM_DRV_INITIALIZER(7),
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#endif
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#ifdef BSP_USING_PWM8
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[BSP_PWM8_INDEX] = PWM_DRV_INITIALIZER(8),
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#endif
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#ifdef BSP_USING_PWM9
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[BSP_PWM9_INDEX] = PWM_DRV_INITIALIZER(9),
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#endif
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};
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/* Convert the raw PWM period counts into ns */
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static rt_uint32_t _convert_counts_ns(uint32_t source_div, uint32_t raw)
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{
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uint32_t pclkd_freq_hz = R_FSP_SystemClockHzGet(FSP_PRIV_CLOCK_PCLKD) >> source_div;
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uint32_t ns = (uint32_t)(((uint64_t)raw * 1000000000ULL) / pclkd_freq_hz);
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return ns;
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}
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/* Convert ns into raw PWM period counts */
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static rt_uint32_t _convert_ns_counts(uint32_t source_div, uint32_t raw)
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{
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uint32_t pclkd_freq_hz = R_FSP_SystemClockHzGet(FSP_PRIV_CLOCK_PCLKD) >> source_div;
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uint32_t counts = (uint32_t)(((uint64_t)raw * (uint64_t)pclkd_freq_hz) / 1000000000ULL);
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return counts;
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}
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/* PWM_CMD_ENABLE or PWM_CMD_DISABLE */
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static rt_err_t drv_pwm_enable(struct ra_pwm *device,
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struct rt_pwm_configuration *configuration,
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rt_bool_t enable)
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{
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fsp_err_t err = FSP_SUCCESS;
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if (enable)
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{
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err = R_GPT_Start(device->g_ctrl);
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}
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else
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{
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err = R_GPT_Stop(device->g_ctrl);
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}
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return (err == FSP_SUCCESS) ? RT_EOK : -RT_ERROR;
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}
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/* PWM_CMD_GET */
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static rt_err_t drv_pwm_get(struct ra_pwm *device,
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struct rt_pwm_configuration *configuration)
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{
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timer_info_t info;
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if (R_GPT_InfoGet(device->g_ctrl, &info) != FSP_SUCCESS)
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return -RT_ERROR;
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configuration->pulse =
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_convert_counts_ns(device->g_cfg->source_div, device->g_cfg->duty_cycle_counts);
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configuration->period =
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_convert_counts_ns(device->g_cfg->source_div, info.period_counts);
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configuration->channel = device->g_cfg->channel;
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return RT_EOK;
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}
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/* PWM_CMD_SET */
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static rt_err_t drv_pwm_set(struct ra_pwm *device,
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struct rt_pwm_configuration *conf)
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{
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uint32_t counts;
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fsp_err_t fsp_erra;
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fsp_err_t fsp_errb;
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rt_err_t rt_err;
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uint32_t pulse;
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uint32_t period;
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struct rt_pwm_configuration orig_conf;
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rt_err = drv_pwm_get(device, &orig_conf);
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if (rt_err != RT_EOK)
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{
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return rt_err;
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}
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/* Pulse cannot last longer than period. */
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period = conf->period;
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pulse = (period >= conf->pulse) ? conf->pulse : period;
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/* Not to set period again if it's not changed. */
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if (period != orig_conf.period)
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{
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counts = _convert_ns_counts(device->g_cfg->source_div, period);
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fsp_erra = R_GPT_PeriodSet(device->g_ctrl, counts);
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if (fsp_erra != FSP_SUCCESS)
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{
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return -RT_ERROR;
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}
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}
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/* Two pins of a channel will not be separated. */
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counts = _convert_ns_counts(device->g_cfg->source_div, pulse);
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fsp_erra = R_GPT_DutyCycleSet(device->g_ctrl, counts, GPT_IO_PIN_GTIOCA);
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fsp_errb = R_GPT_DutyCycleSet(device->g_ctrl, counts, GPT_IO_PIN_GTIOCB);
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if (fsp_erra != FSP_SUCCESS || fsp_errb != FSP_SUCCESS)
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{
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return -RT_ERROR;
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}
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return RT_EOK;
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}
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/**
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* Implement of control method in struct rt_pwm_ops.
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*/
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static rt_err_t drv_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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struct ra_pwm *pwm_device = (struct ra_pwm *)device->parent.user_data;
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/**
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* There's actually only one GPT timer with 10 channels. In this case, the
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* timer is separated into 10 PWM devices, so each device has only one
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* channel.
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*/
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if (configuration->channel != 0)
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{
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return -RT_EINVAL;
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}
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switch (cmd)
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{
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case PWM_CMD_ENABLE:
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return drv_pwm_enable(pwm_device, configuration, RT_TRUE);
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case PWM_CMD_DISABLE:
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return drv_pwm_enable(pwm_device, configuration, RT_FALSE);
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case PWM_CMD_GET:
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return drv_pwm_get(pwm_device, configuration);
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case PWM_CMD_SET:
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return drv_pwm_set(pwm_device, configuration);
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default:
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return -RT_EINVAL;
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}
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return RT_EOK;
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}
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/**
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* This is to register the PWM device
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*
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* Note that the PWM driver only supports one fixed pin.
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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 = RT_EOK;
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rt_err_t rt_err = RT_EOK;
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fsp_err_t fsp_err = FSP_SUCCESS;
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for (int i = 0; i < BSP_PWMS_NUM; i++)
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{
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fsp_err = R_GPT_Open(ra6m4_pwm_obj[i].g_ctrl,
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ra6m4_pwm_obj[i].g_cfg);
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rt_err = rt_device_pwm_register(&ra6m4_pwm_obj[i].pwm_device,
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ra6m4_pwm_obj[i].name,
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&drv_ops,
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&ra6m4_pwm_obj[i]);
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if (fsp_err != FSP_SUCCESS || rt_err != RT_EOK)
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{
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ret = -RT_ERROR;
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}
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}
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return ret;
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}
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INIT_BOARD_EXPORT(rt_hw_pwm_init);
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#endif /* BSP_USING_PWM */
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