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/**************************************************************************//**
* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-9-16 Philo First version
*
******************************************************************************/
#include <rtconfig.h>
#include <rtdevice.h>
#include "NuMicro.h"
#ifdef BSP_USING_ADC
/* Private define ---------------------------------------------------------------*/
/* Private Typedef --------------------------------------------------------------*/
struct nu_adc
{
struct rt_adc_device dev;
char *name;
ADC_T *adc_base;
int adc_reg_tab;
int adc_max_ch_num;
};
typedef struct nu_adc *nu_adc_t;
/* Private functions ------------------------------------------------------------*/
static rt_err_t nu_adc_enabled(struct rt_adc_device *device, rt_int8_t channel, rt_bool_t enabled);
static rt_err_t nu_get_adc_value(struct rt_adc_device *device, rt_int8_t channel, rt_uint32_t *value);
/* Public functions ------------------------------------------------------------*/
int rt_hw_adc_init(void);
/* Private variables ------------------------------------------------------------*/
static struct nu_adc nu_adc_arr [] =
{
#if defined(BSP_USING_ADC0)
{
.name = "adc0",
.adc_base = ADC,
.adc_max_ch_num = 15,
},
#endif
{0}
};
static const struct rt_adc_ops nu_adc_ops =
{
nu_adc_enabled,
nu_get_adc_value,
};
typedef struct rt_adc_ops *rt_adc_ops_t;
/* nu_adc_enabled - Enable ADC clock and wait for ready */
static rt_err_t nu_adc_enabled(struct rt_adc_device *device, rt_int8_t channel, rt_bool_t enabled)
{
ADC_T *adc_base = ((nu_adc_t)device)->adc_base;
int *padc_reg_tab = &((nu_adc_t)device)->adc_reg_tab;
RT_ASSERT(device != RT_NULL);
if (channel >= ((nu_adc_t)device)->adc_max_ch_num)
return -(RT_EINVAL);
if (enabled)
{
ADC_POWER_ON(adc_base);
if (*padc_reg_tab == 0)
{
ADC_Open(adc_base, ADC_ADCR_DIFFEN_SINGLE_END, ADC_ADCR_ADMD_SINGLE, (0x1 << channel));
}
*padc_reg_tab |= (0x1 << channel);
}
else
{
*padc_reg_tab &= ~(0x1 << channel);
if (*padc_reg_tab == 0)
{
ADC_Close(adc_base);
}
ADC_POWER_DOWN(adc_base);
}
return RT_EOK;
}
static rt_err_t nu_get_adc_value(struct rt_adc_device *device, rt_int8_t channel, rt_uint32_t *value)
{
RT_ASSERT(device != RT_NULL);
RT_ASSERT(value != RT_NULL);
ADC_T *adc_base = ((nu_adc_t)device)->adc_base;
int *padc_reg_tab = &((nu_adc_t)device)->adc_reg_tab;
if (channel >= ((nu_adc_t)device)->adc_max_ch_num)
{
*value = 0xFFFFFFFF;
return -(RT_EINVAL);
}
if ((*padc_reg_tab & (0x1 << channel)) == 0)
{
*value = 0xFFFFFFFF;
return -(RT_EBUSY);
}
ADC_SET_INPUT_CHANNEL(adc_base, (0x1<<channel));
ADC_CLR_INT_FLAG(adc_base, ADC_ADF_INT);
ADC_ENABLE_INT(adc_base, ADC_ADF_INT);
ADC_START_CONV(adc_base);
while (ADC_GET_INT_FLAG(adc_base, ADC_ADF_INT) == 0);
*value = ADC_GET_CONVERSION_DATA(adc_base,channel);
return RT_EOK;
}
int rt_hw_adc_init(void)
{
rt_err_t result = -RT_ERROR;
int nu_sel = 0;
while (nu_adc_arr[nu_sel].name != 0)
{
nu_adc_arr[nu_sel].adc_reg_tab = 0;
result = rt_hw_adc_register(&nu_adc_arr[nu_sel].dev, nu_adc_arr[nu_sel].name, &nu_adc_ops, NULL);
RT_ASSERT(result == RT_EOK);
nu_sel++;
}
return (int)result;
}
INIT_BOARD_EXPORT(rt_hw_adc_init);
#endif /* #if defined(BSP_USING_ADC) */
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