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/*
* Copyright (c) 2006-2026, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-04-20 tyustli the first version.
*
*/
#include <rtthread.h>
#ifdef BSP_USING_LPADC
#if !defined(BSP_USING_LPADC1) && !defined(BSP_USING_LPADC2)
#error "Please define at least one BSP_USING_LPADCx"
#endif
#if (defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
#error "Please don't define 'FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL'!"
#endif
#define LOG_TAG "drv.lpadc"
#include <drv_log.h>
#include "drv_lpadc.h"
#include "fsl_lpadc.h"
#include <rtdevice.h>
lpadc_config_t mLpadcConfigStruct;
#if defined(BSP_USING_LPADC1)
static struct rt_adc_device lpadc1_device;
#endif
#if defined(BSP_USING_LPADC2)
static struct rt_adc_device lpadc2_device;
#endif
#if defined(BSP_LPADC1_USING_DMA)
#include "fsl_edma.h"
volatile bool g_Transfer_Done = false;
AT_NONCACHEABLE_SECTION_ALIGN_INIT(uint32_t adc_result[7], sizeof(uint32_t)) = { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };
/* User callback function for EDMA transfer. */
void DMA_Callback(edma_handle_t *handle, void *userData, bool transferDone, uint32_t tcds)
{
if (transferDone)
{
g_Transfer_Done = true;
}
}
#endif
static rt_err_t imxrt_lp_adc_enabled(struct rt_adc_device *device, rt_int8_t channel, rt_bool_t enabled)
{
ADC_Type *base;
/* channel check*/
if (channel < 4)
{
return -RT_EINVAL;
}
base = (ADC_Type *)(device->parent.user_data);
if (RT_TRUE == enabled)
{
LPADC_Enable(base, true);
}
else
{
LPADC_Enable(base, false);
}
return RT_EOK;
}
static rt_err_t imxrt_lp_adc_convert(struct rt_adc_device *device, rt_int8_t channel, rt_uint32_t *value)
{
ADC_Type *base;
uint32_t data_mask = 0xffffffff;
#if defined(BSP_LPADC1_USING_DMA)
#else
uint8_t i = 0;
uint32_t adc_result[7] = { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 }; /* conv sequence: A1_4, A1_5(INVALID), A1_6, A1_7, B1_5, B1_6, B1_7 */
lpadc_conv_result_t mLpadcResultConfigStruct;
#endif
base = (ADC_Type *)(device->parent.user_data);
LPADC_DoSoftwareTrigger(base, 1U);
#if defined(BSP_LPADC1_USING_DMA)
extern edma_handle_t DMA4_CH0_Handle;
data_mask = 0xffff;
g_Transfer_Done = false;
EDMA_StartTransfer(&DMA4_CH0_Handle);
/* Wait for EDMA transfer finish */
while (g_Transfer_Done != true)
{
}
#else
for (i = 0; i < 7; i++)
{
#if (defined(FSL_FEATURE_LPADC_FIFO_COUNT) && (FSL_FEATURE_LPADC_FIFO_COUNT == 2U))
while (!LPADC_GetConvResult(base, &mLpadcResultConfigStruct, 0U))
#else
while (!LPADC_GetConvResult(base, &mLpadcResultConfigStruct))
#endif /* FSL_FEATURE_LPADC_FIFO_COUNT */
{
}
adc_result[i] = (mLpadcResultConfigStruct.convValue);
}
#endif
switch (channel)
{
case 4:
*value = adc_result[0] & data_mask;
break;
case 5:
*value = adc_result[4] & data_mask;
break;
case 6:
*value = adc_result[2] & data_mask;
break;
case 7:
*value = adc_result[3] & data_mask;
break;
default:
*value = 0;
return -RT_EINVAL;
}
return RT_EOK;
}
static rt_uint8_t imxrt_lp_adc_get_resolution(struct rt_adc_device *device)
{
return 16;
}
static rt_int16_t imxrt_lp_adc_get_vref(struct rt_adc_device *device)
{
return 1800;
}
static struct rt_adc_ops imxrt_lpadc_ops = {
.enabled = imxrt_lp_adc_enabled,
.convert = imxrt_lp_adc_convert,
.get_resolution = imxrt_lp_adc_get_resolution,
.get_vref = imxrt_lp_adc_get_vref,
};
int rt_hw_adc_init(void)
{
int result = RT_EOK;
#if defined(BSP_USING_LPADC1)
/* on-chip peripherals are initialized in BOARD_InitPeripherals function of board.c */
result = rt_hw_adc_register(&lpadc1_device, "lpadc1", &imxrt_lpadc_ops, ADC1);
if (result != RT_EOK)
{
LOG_E("register lpadc1 device failed error code = %d\n", result);
}
#endif
#if defined(BSP_USING_LPADC2)
LPADC_Init(LPADC1, &mLpadcConfigStruct);
result = rt_hw_adc_register(&lpadc2_device, "lpadc2", &imxrt_lpadc_ops, LPADC2);
if (result != RT_EOK)
{
LOG_E("register lpadc2 device failed error code = %d\n", result);
}
#endif
return result;
}
INIT_DEVICE_EXPORT(rt_hw_adc_init);
#endif /* BSP_USING_LPADC */
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