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[device][adc] implement adc_get_vref (#5988)

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* add adc_get_vref

add stm32_adc_get_vref
This commit is contained in:
Stanley Lwin
2022-05-28 19:22:33 -07:00
committed by GitHub
parent ccfd2c3b28
commit 04a17d469a
3 changed files with 48 additions and 18 deletions
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46
components/drivers/misc/adc.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2006-2021, RT-Thread Development Team
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
@@ -17,7 +17,6 @@
#include <stdlib.h>
#define DBG_TAG "adc"
#define REFER_VOLTAGE 330 /*reference voltage, multiplied by 100 and reserve 2 decimal places for data accuracy*/
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
@@ -54,7 +53,7 @@ static rt_err_t _adc_control(rt_device_t dev, int cmd, void *args)
{
result = adc->ops->enabled(adc, (rt_uint32_t)args, RT_FALSE);
}
else if (cmd == RT_ADC_CMD_GET_RESOLUTION && adc->ops->get_resolution)
else if (cmd == RT_ADC_CMD_GET_RESOLUTION && adc->ops->get_resolution && args)
{
rt_uint8_t resolution = adc->ops->get_resolution(adc);
if(resolution != 0)
@@ -64,6 +63,15 @@ static rt_err_t _adc_control(rt_device_t dev, int cmd, void *args)
result = RT_EOK;
}
}
else if (cmd == RT_ADC_CMD_GET_VREF && adc->ops->get_vref && args)
{
rt_int16_t value = adc->ops->get_vref(adc);
if(value != 0)
{
*((rt_int16_t *) args) = value;
result = RT_EOK;
}
}
return result;
}
@@ -154,28 +162,40 @@ rt_err_t rt_adc_disable(rt_adc_device_t dev, rt_uint32_t channel)
return result;
}
rt_uint32_t rt_adc_voltage(rt_adc_device_t dev, rt_uint32_t channel)
rt_int16_t rt_adc_voltage(rt_adc_device_t dev, rt_uint32_t channel)
{
rt_uint32_t value = 0, voltage = 0;
rt_uint32_t value = 0;
rt_int16_t vref = 0, voltage = 0;
rt_uint8_t resolution = 0;
RT_ASSERT(dev);
/*read the value and convert to voltage*/
if (dev->ops->get_resolution != RT_NULL && dev->ops->convert != RT_NULL)
/*get the resolution in bits*/
if (_adc_control((rt_device_t) dev, RT_ADC_CMD_GET_RESOLUTION, &resolution) != RT_EOK)
{
/*get the convert bits*/
rt_uint8_t resolution = dev->ops->get_resolution(dev);
dev->ops->convert(dev, channel, &value);
voltage = value * REFER_VOLTAGE / (1 << resolution);
goto _voltage_exit;
}
/*get the reference voltage*/
if (_adc_control((rt_device_t) dev, RT_ADC_CMD_GET_VREF, &vref) != RT_EOK)
{
goto _voltage_exit;
}
/*read the value and convert to voltage*/
dev->ops->convert(dev, channel, &value);
voltage = value * vref / (1 << resolution);
_voltage_exit:
return voltage;
}
#ifdef RT_USING_FINSH
static int adc(int argc, char **argv)
{
int value = 0, voltage = 0;
int value = 0;
rt_int16_t voltage = 0;
rt_err_t result = -RT_ERROR;
static rt_adc_device_t adc_device = RT_NULL;
char *result_str;
@@ -246,7 +266,7 @@ static int adc(int argc, char **argv)
{
voltage = rt_adc_voltage(adc_device, atoi(argv[2]));
result_str = (result == RT_EOK) ? "success" : "failure";
rt_kprintf("%s channel %d voltage is %d.%02d \n", adc_device->parent.parent.name, atoi(argv[2]), voltage / 100, voltage % 100);
rt_kprintf("%s channel %d voltage is %d.%03dV \n", adc_device->parent.parent.name, atoi(argv[2]), voltage / 1000, voltage % 1000);
}
else
{