154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/*
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* Copyright (c) 2006-2024, 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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* 2024/02/19 flyingcys first version
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*/
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#include <rtthread.h>
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#include <rtdevice.h>
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#include "drv_pwm.h"
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#define DBG_LEVEL DBG_LOG
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#include <rtdbg.h>
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#define LOG_TAG "DRV.PWM"
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struct cvi_pwm_dev
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{
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struct rt_device_pwm device;
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const char *name;
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rt_ubase_t reg_base;
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};
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static const uint64_t count_unit = 100000000; // 100M count per second
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static const uint64_t NSEC_COUNT = 1000000000; // ns
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static void cvi_pwm_set_config(rt_ubase_t reg_base, struct rt_pwm_configuration *cfg)
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{
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unsigned long long duty_clk, period_clk;
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cvi_pwm_set_polarity_high_ch(reg_base, (cfg->channel & PWM_MAX_CH));
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duty_clk = (cfg->pulse * count_unit) / NSEC_COUNT;
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cvi_pwm_set_high_period_ch(reg_base, (cfg->channel & PWM_MAX_CH), duty_clk);
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period_clk = (cfg->period * count_unit) / NSEC_COUNT;
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cvi_pwm_set_period_ch(reg_base, (cfg->channel & PWM_MAX_CH), period_clk);
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cvi_pwm_output_en_ch(reg_base, cfg->channel & PWM_MAX_CH);
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}
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static void cvi_pwm_get_config(rt_ubase_t reg_base, struct rt_pwm_configuration *cfg)
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{
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unsigned long long duty_clk, period_clk;
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duty_clk = cvi_pwm_get_high_period_ch(reg_base, (cfg->channel & PWM_MAX_CH));
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cfg->pulse = duty_clk * NSEC_COUNT / count_unit;
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period_clk = cvi_pwm_get_period_ch(reg_base, (cfg->channel & PWM_MAX_CH));
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cfg->period = period_clk * NSEC_COUNT / count_unit;
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}
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static rt_err_t _pwm_control(struct rt_device_pwm *device, int cmd, void *arg)
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{
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struct rt_pwm_configuration *cfg = (struct rt_pwm_configuration *)arg;
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struct cvi_pwm_dev *pwm_dev = (struct cvi_pwm_dev *)device->parent.user_data;
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unsigned long long duty_clk, period_clk;
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const uint64_t count_unit = 100000000; // 100M count per second
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const uint64_t NSEC_COUNT = 1000000000; // ns
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if (cfg->channel >= PWM_CHANNEL_NUM)
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return -RT_EINVAL;
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switch (cmd)
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{
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case PWM_CMD_ENABLE:
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cvi_pwm_start_en_ch(pwm_dev->reg_base, cfg->channel & PWM_MAX_CH);
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break;
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case PWM_CMD_DISABLE:
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cvi_pwm_start_dis_ch(pwm_dev->reg_base, cfg->channel & PWM_MAX_CH);
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break;
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case PWM_CMD_SET:
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cvi_pwm_set_config(pwm_dev->reg_base, cfg);
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break;
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case PWM_CMD_GET:
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cvi_pwm_get_config(pwm_dev->reg_base, cfg);
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break;
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case PWM_CMD_SET_PERIOD:
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period_clk = (cfg->period * count_unit) / NSEC_COUNT;
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cvi_pwm_set_period_ch(pwm_dev->reg_base, (cfg->channel & PWM_MAX_CH), period_clk);
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break;
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case PWM_CMD_SET_PULSE:
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duty_clk = (cfg->pulse * count_unit) / NSEC_COUNT;
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cvi_pwm_set_high_period_ch(pwm_dev->reg_base, (cfg->channel & PWM_MAX_CH), duty_clk);
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break;
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default:
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LOG_D("cmd: %x channel: %d period: %d pulse: %d", cmd, cfg->channel, cfg->period, cfg->pulse);
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break;
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}
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return RT_EOK;
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}
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const static struct rt_pwm_ops cvi_pwm_ops =
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{
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.control = &_pwm_control
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};
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static struct cvi_pwm_dev cvi_pwm[] =
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{
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#ifdef BSP_USING_PWM0
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{
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.name = "pwm0",
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.reg_base = CVI_PWM0_BASE,
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},
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#endif
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#ifdef BSP_USING_PWM1
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{
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.name = "pwm1",
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.reg_base = CVI_PWM1_BASE,
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},
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#endif
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#ifdef BSP_USING_PWM2
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{
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.name = "pwm2",
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.reg_base = CVI_PWM2_BASE,
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},
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#endif
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#ifdef BSP_USING_PWM3
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{
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.name = "pwm3",
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.reg_base = CVI_PWM3_BASE,
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},
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#endif
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};
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int rt_hw_pwm_init(void)
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{
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int result = RT_EOK;
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uint8_t i;
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for (i = 0; i < sizeof(cvi_pwm) / sizeof(cvi_pwm[0]); i++)
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{
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result = rt_device_pwm_register(&cvi_pwm[i].device, cvi_pwm[i].name, &cvi_pwm_ops, &cvi_pwm[i]);
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if (result != RT_EOK)
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{
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LOG_E("device %s register failed", cvi_pwm[i].name);
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return -RT_ERROR;
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}
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}
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return RT_EOK;
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}
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INIT_BOARD_EXPORT(rt_hw_pwm_init);
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