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/**************************************************************************//**
* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-2-11 FYChou First version
*
******************************************************************************/
#include <rtconfig.h>
#include <rtdevice.h>
#include "NuMicro.h"
#ifdef BSP_USING_EADC
/* Private define ---------------------------------------------------------------*/
/* Private Typedef --------------------------------------------------------------*/
struct nu_eadc
{
struct rt_adc_device dev;
char *name;
EADC_T *eadc_base;
int eadc_reg_tab;
int eadc_max_ch_num;
};
typedef struct nu_eadc *nu_eadc_t;
/* Private functions ------------------------------------------------------------*/
static rt_err_t nu_eadc_enabled(struct rt_adc_device *device, rt_uint32_t channel, rt_bool_t enabled);
static rt_err_t nu_get_eadc_value(struct rt_adc_device *device, rt_uint32_t channel, rt_uint32_t *value);
static rt_err_t nu_get_eadc_value(struct rt_adc_device *device, rt_uint32_t channel, rt_uint32_t *value);
/* Public functions ------------------------------------------------------------*/
int rt_hw_eadc_init(void);
/* Private variables ------------------------------------------------------------*/
static struct nu_eadc nu_eadc_arr [] =
{
#if defined(BSP_USING_EADC0)
{
.name = "eadc0",
.eadc_base = EADC0,
.eadc_max_ch_num = 19,
},
#endif
#if defined(BSP_USING_EADC1)
{
.name = "eadc1",
.eadc_base = EADC1,
.eadc_max_ch_num = 19,
},
#endif
{0}
};
static const struct rt_adc_ops nu_adc_ops =
{
nu_eadc_enabled,
nu_get_eadc_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_eadc_enabled(struct rt_adc_device *device, rt_uint32_t channel, rt_bool_t enabled)
{
EADC_T *eadc_base = ((nu_eadc_t)device)->eadc_base;
int *peadc_reg_tab = &((nu_eadc_t)device)->eadc_reg_tab;
RT_ASSERT(device != RT_NULL);
if (channel >= ((nu_eadc_t)device)->eadc_max_ch_num)
return -(RT_EINVAL);
if (enabled)
{
if (*peadc_reg_tab == 0)
{
EADC_Open(eadc_base, EADC_CTL_DIFFEN_SINGLE_END);
}
*peadc_reg_tab |= (0x1 << channel);
}
else
{
*peadc_reg_tab &= ~(0x1 << channel);
if (*peadc_reg_tab == 0)
{
EADC_Close(eadc_base);
}
}
return RT_EOK;
}
static rt_err_t nu_get_eadc_value(struct rt_adc_device *device, rt_uint32_t channel, rt_uint32_t *value)
{
RT_ASSERT(device != RT_NULL);
RT_ASSERT(value != RT_NULL);
EADC_T *eadc_base = ((nu_eadc_t)device)->eadc_base;
int *peadc_reg_tab = &((nu_eadc_t)device)->eadc_reg_tab;
if (channel >= ((nu_eadc_t)device)->eadc_max_ch_num)
{
*value = 0xFFFFFFFF;
return -(RT_EINVAL);
}
if ((*peadc_reg_tab & (1 << channel)) == 0)
{
*value = 0xFFFFFFFF;
return -(RT_EBUSY);
}
EADC_ConfigSampleModule(eadc_base, 0, EADC_SOFTWARE_TRIGGER, channel);
EADC_CLR_INT_FLAG(eadc_base, EADC_STATUS2_ADIF0_Msk);
EADC_ENABLE_INT(eadc_base, BIT0);
EADC_ENABLE_SAMPLE_MODULE_INT(eadc_base, 0, BIT0);
EADC_START_CONV(eadc_base, BIT0);
while (EADC_GET_INT_FLAG(eadc_base, BIT0) == 0);
*value = EADC_GET_CONV_DATA(eadc_base, 0);
return RT_EOK;
}
int rt_hw_eadc_init(void)
{
rt_err_t result = -RT_ERROR;
int nu_sel = 0;
while (nu_eadc_arr[nu_sel].name != 0)
{
nu_eadc_arr[nu_sel].eadc_reg_tab = 0;
result = rt_hw_adc_register(&nu_eadc_arr[nu_sel].dev, nu_eadc_arr[nu_sel].name, &nu_adc_ops, NULL);
RT_ASSERT(result == RT_EOK);
nu_sel++;
}
return result;
}
INIT_BOARD_EXPORT(rt_hw_eadc_init);
#endif //#if defined(BSP_USING_EADC)
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