297 lines
8.0 KiB
C
297 lines
8.0 KiB
C
/*
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* Copyright (c) 2006-2022, 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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* 2018-05-07 aozima the first version
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* 2018-11-16 Ernest Chen add finsh command and update adc function
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* 2022-05-11 Stanley Lwin add finsh voltage conversion command
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*/
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#include <rtthread.h>
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#include <rtdevice.h>
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#include <string.h>
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#include <stdlib.h>
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#define DBG_TAG "adc"
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#define DBG_LVL DBG_INFO
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#include <rtdbg.h>
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static rt_size_t _adc_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
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{
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rt_err_t result = RT_EOK;
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rt_size_t i;
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struct rt_adc_device *adc = (struct rt_adc_device *)dev;
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rt_uint32_t *value = (rt_uint32_t *)buffer;
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for (i = 0; i < size; i += sizeof(int))
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{
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result = adc->ops->convert(adc, pos + i, value);
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if (result != RT_EOK)
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{
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return 0;
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}
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value++;
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}
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return i;
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}
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static rt_err_t _adc_control(rt_device_t dev, int cmd, void *args)
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{
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rt_err_t result = -RT_EINVAL;
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rt_adc_device_t adc = (struct rt_adc_device *)dev;
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if (cmd == RT_ADC_CMD_ENABLE && adc->ops->enabled)
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{
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result = adc->ops->enabled(adc, (rt_uint32_t)args, RT_TRUE);
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}
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else if (cmd == RT_ADC_CMD_DISABLE && adc->ops->enabled)
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{
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result = adc->ops->enabled(adc, (rt_uint32_t)args, RT_FALSE);
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}
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else if (cmd == RT_ADC_CMD_GET_RESOLUTION && adc->ops->get_resolution && args)
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{
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rt_uint8_t resolution = adc->ops->get_resolution(adc);
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if(resolution != 0)
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{
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*((rt_uint8_t*)args) = resolution;
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LOG_D("resolution: %d bits", resolution);
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result = RT_EOK;
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}
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}
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else if (cmd == RT_ADC_CMD_GET_VREF && adc->ops->get_vref && args)
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{
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rt_int16_t value = adc->ops->get_vref(adc);
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if(value != 0)
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{
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*((rt_int16_t *) args) = value;
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result = RT_EOK;
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}
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}
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return result;
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}
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#ifdef RT_USING_DEVICE_OPS
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const static struct rt_device_ops adc_ops =
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{
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RT_NULL,
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RT_NULL,
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RT_NULL,
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_adc_read,
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RT_NULL,
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_adc_control,
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};
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#endif
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rt_err_t rt_hw_adc_register(rt_adc_device_t device, const char *name, const struct rt_adc_ops *ops, const void *user_data)
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{
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rt_err_t result = RT_EOK;
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RT_ASSERT(ops != RT_NULL && ops->convert != RT_NULL);
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device->parent.type = RT_Device_Class_ADC;
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device->parent.rx_indicate = RT_NULL;
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device->parent.tx_complete = RT_NULL;
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#ifdef RT_USING_DEVICE_OPS
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device->parent.ops = &adc_ops;
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#else
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device->parent.init = RT_NULL;
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device->parent.open = RT_NULL;
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device->parent.close = RT_NULL;
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device->parent.read = _adc_read;
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device->parent.write = RT_NULL;
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device->parent.control = _adc_control;
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#endif
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device->ops = ops;
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device->parent.user_data = (void *)user_data;
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result = rt_device_register(&device->parent, name, RT_DEVICE_FLAG_RDWR);
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return result;
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}
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rt_uint32_t rt_adc_read(rt_adc_device_t dev, rt_uint32_t channel)
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{
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rt_uint32_t value;
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RT_ASSERT(dev);
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dev->ops->convert(dev, channel, &value);
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return value;
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}
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rt_err_t rt_adc_enable(rt_adc_device_t dev, rt_uint32_t channel)
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{
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rt_err_t result = RT_EOK;
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RT_ASSERT(dev);
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if (dev->ops->enabled != RT_NULL)
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{
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result = dev->ops->enabled(dev, channel, RT_TRUE);
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}
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else
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{
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result = -RT_ENOSYS;
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}
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return result;
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}
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rt_err_t rt_adc_disable(rt_adc_device_t dev, rt_uint32_t channel)
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{
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rt_err_t result = RT_EOK;
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RT_ASSERT(dev);
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if (dev->ops->enabled != RT_NULL)
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{
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result = dev->ops->enabled(dev, channel, RT_FALSE);
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}
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else
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{
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result = -RT_ENOSYS;
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}
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return result;
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}
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rt_int16_t rt_adc_voltage(rt_adc_device_t dev, rt_uint32_t channel)
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{
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rt_uint32_t value = 0;
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rt_int16_t vref = 0, voltage = 0;
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rt_uint8_t resolution = 0;
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RT_ASSERT(dev);
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/*get the resolution in bits*/
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if (_adc_control((rt_device_t) dev, RT_ADC_CMD_GET_RESOLUTION, &resolution) != RT_EOK)
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{
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goto _voltage_exit;
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}
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/*get the reference voltage*/
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if (_adc_control((rt_device_t) dev, RT_ADC_CMD_GET_VREF, &vref) != RT_EOK)
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{
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goto _voltage_exit;
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}
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/*read the value and convert to voltage*/
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dev->ops->convert(dev, channel, &value);
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voltage = value * vref / (1 << resolution);
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_voltage_exit:
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return voltage;
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}
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#ifdef RT_USING_FINSH
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static int adc(int argc, char **argv)
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{
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int value = 0;
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rt_int16_t voltage = 0;
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rt_err_t result = -RT_ERROR;
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static rt_adc_device_t adc_device = RT_NULL;
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char *result_str;
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if (argc > 1)
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{
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if (!strcmp(argv[1], "probe"))
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{
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if (argc == 3)
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{
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adc_device = (rt_adc_device_t)rt_device_find(argv[2]);
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result_str = (adc_device == RT_NULL) ? "failure" : "success";
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rt_kprintf("probe %s %s \n", argv[2], result_str);
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}
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else
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{
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rt_kprintf("adc probe <device name> - probe adc by name\n");
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}
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}
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else
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{
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if (adc_device == RT_NULL)
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{
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rt_kprintf("Please using 'adc probe <device name>' first\n");
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return -RT_ERROR;
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}
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if (!strcmp(argv[1], "enable"))
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{
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if (argc == 3)
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{
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result = rt_adc_enable(adc_device, atoi(argv[2]));
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result_str = (result == RT_EOK) ? "success" : "failure";
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rt_kprintf("%s channel %d enables %s \n", adc_device->parent.parent.name, atoi(argv[2]), result_str);
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}
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else
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{
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rt_kprintf("adc enable <channel> - enable adc channel\n");
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}
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}
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else if (!strcmp(argv[1], "read"))
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{
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if (argc == 3)
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{
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value = rt_adc_read(adc_device, atoi(argv[2]));
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rt_kprintf("%s channel %d read value is 0x%08X \n", adc_device->parent.parent.name, atoi(argv[2]), value);
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}
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else
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{
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rt_kprintf("adc read <channel> - read adc value on the channel\n");
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}
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}
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else if (!strcmp(argv[1], "disable"))
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{
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if (argc == 3)
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{
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result = rt_adc_disable(adc_device, atoi(argv[2]));
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result_str = (result == RT_EOK) ? "success" : "failure";
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rt_kprintf("%s channel %d disable %s \n", adc_device->parent.parent.name, atoi(argv[2]), result_str);
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}
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else
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{
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rt_kprintf("adc disable <channel> - disable adc channel\n");
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}
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}
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else if (!strcmp(argv[1], "voltage"))
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{
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if(argc == 3)
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{
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voltage = rt_adc_voltage(adc_device, atoi(argv[2]));
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result_str = (result == RT_EOK) ? "success" : "failure";
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rt_kprintf("%s channel %d voltage is %d.%03dV \n", adc_device->parent.parent.name, atoi(argv[2]), voltage / 1000, voltage % 1000);
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}
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else
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{
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rt_kprintf("adc convert voltage <channel> \n");
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}
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}
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else
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{
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rt_kprintf("Unknown command. Please enter 'adc' for help\n");
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}
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}
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}
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else
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{
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rt_kprintf("Usage: \n");
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rt_kprintf("adc probe <device name> - probe adc by name\n");
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rt_kprintf("adc read <channel> - read adc value on the channel\n");
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rt_kprintf("adc disable <channel> - disable adc channel\n");
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rt_kprintf("adc enable <channel> - enable adc channel\n");
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result = -RT_ERROR;
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}
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return RT_EOK;
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}
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MSH_CMD_EXPORT(adc, adc [option]);
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#endif /* RT_USING_FINSH */
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