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rt-thread-official/bsp/efm32/drv_adc.c

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/***************************************************************************//**
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* @file drv_adc.c
* @brief ADC driver of RT-Thread RTOS for EFM32
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* COPYRIGHT (C) 2012, RT-Thread Development Team
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* @author onelife
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* @version 1.0
*******************************************************************************
* @section License
* The license and distribution terms for this file may be found in the file
* LICENSE in this distribution or at http://www.rt-thread.org/license/LICENSE
*******************************************************************************
* @section Change Logs
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* Date Author Notes
* 2011-02-21 onelife Initial creation for EFM32
* 2011-07-14 onelife Add multiple channels support for scan mode
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******************************************************************************/
/***************************************************************************//**
* @addtogroup efm32
* @{
******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "board.h"
#include "drv_adc.h"
#if defined(RT_USING_ADC0)
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
#ifdef RT_ADC_DEBUG
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#define adc_debug(format,args...) rt_kprintf(format, ##args)
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#else
#define adc_debug(format,args...)
#endif
/* Private variables ---------------------------------------------------------*/
#ifdef RT_USING_ADC0
static struct rt_device adc0_device;
#endif
static rt_uint32_t adcErrataShift = 0;
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/***************************************************************************//**
* @brief
* Calibrate offset and gain for the specified reference.
* Supports currently only single ended gain calibration.
* Could easily be expanded to support differential gain calibration.
*
* @details
* The offset calibration routine measures 0 V with the ADC, and adjust
* the calibration register until the converted value equals 0.
* The gain calibration routine needs an external reference voltage equal
* to the top value for the selected reference. For example if the 2.5 V
* reference is to be calibrated, the external supply must also equal 2.5V.
*
* @param[in] adc
* Pointer to ADC peripheral register block.
*
* @param[in] ref
* Reference used during calibration. Can be both external and internal
* references.
*
* @param[in] input
* Input channel used during calibration.
*
* @return
* The final value of the calibration register, note that the calibration
* register gets updated with this value during the calibration.
* No need to load the calibration values after the function returns.
******************************************************************************/
rt_uint32_t efm32_adc_calibration(
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ADC_TypeDef *adc,
ADC_Ref_TypeDef ref,
ADC_SingleInput_TypeDef input)
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{
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rt_uint32_t cal;
rt_int32_t sample;
rt_int8_t high, mid, low, tmp;
ADC_InitSingle_TypeDef singleInit = ADC_INITSINGLE_DEFAULT;
/* Init for single conversion use, measure diff 0 with selected reference. */
singleInit.reference = ref;
singleInit.input = adcSingleInpDiff0;
singleInit.acqTime = adcAcqTime32;
singleInit.diff = true;
/* Enable oversampling rate */
singleInit.resolution = adcResOVS;
ADC_InitSingle(adc, &singleInit);
/* ADC is now set up for offset calibration */
/* Offset calibration register is a 7 bit signed 2's complement value. */
/* Use unsigned indexes for binary search, and convert when calibration */
/* register is written to. */
high = 63;
low = -64;
/* Do binary search for offset calibration*/
while (low < high)
{
/* Calculate midpoint */
mid = low + (high - low) / 2;
/* Midpoint is converted to 2's complement and written to both scan and */
/* single calibration registers */
cal = adc->CAL & ~(_ADC_CAL_SINGLEOFFSET_MASK | _ADC_CAL_SCANOFFSET_MASK);
tmp = mid < 0 ? (((mid & 0x3F) ^ 0x3F) | 0x40) + 1 : mid;
cal |= tmp << _ADC_CAL_SINGLEOFFSET_SHIFT;
cal |= tmp << _ADC_CAL_SCANOFFSET_SHIFT;
adc_debug("adc->CAL = %x, cal = %x, tmp = %x\n", adc->CAL, cal, tmp);
adc->CAL = cal;
/* Do a conversion */
ADC_Start(adc, adcStartSingle);
/* Wait while conversion is active */
while (adc->STATUS & ADC_STATUS_SINGLEACT) ;
/* Get ADC result */
sample = ADC_DataSingleGet(adc);
/* Check result and decide in which part of to repeat search */
/* Calibration register has negative effect on result */
if (sample < 0)
{
/* Repeat search in bottom half. */
high = mid;
}
else if (sample > 0)
{
/* Repeat search in top half. */
low = mid + 1;
}
else
{
/* Found it, exit while loop */
break;
}
}
adc_debug("adc->CAL = %x\n", adc->CAL);
/* Now do gain calibration, only input and diff settings needs to be changed */
adc->SINGLECTRL &= ~(_ADC_SINGLECTRL_INPUTSEL_MASK | _ADC_SINGLECTRL_DIFF_MASK);
adc->SINGLECTRL |= (input << _ADC_SINGLECTRL_INPUTSEL_SHIFT);
adc->SINGLECTRL |= (false << _ADC_SINGLECTRL_DIFF_SHIFT);
/* ADC is now set up for gain calibration */
/* Gain calibration register is a 7 bit unsigned value. */
high = 127;
low = 0;
/* Do binary search for gain calibration */
while (low < high)
{
/* Calculate midpoint and write to calibration register */
mid = low + (high - low) / 2;
/* Midpoint is converted to 2's complement */
cal = adc->CAL & ~(_ADC_CAL_SINGLEGAIN_MASK | _ADC_CAL_SCANGAIN_MASK);
cal |= mid << _ADC_CAL_SINGLEGAIN_SHIFT;
cal |= mid << _ADC_CAL_SCANGAIN_SHIFT;
adc_debug("adc->CAL = %x, cal = %x, mid = %x\n", adc->CAL, cal, mid);
adc->CAL = cal;
/* Do a conversion */
ADC_Start(adc, adcStartSingle);
/* Wait while conversion is active */
while (adc->STATUS & ADC_STATUS_SINGLEACT) ;
/* Get ADC result */
sample = ADC_DataSingleGet(adc);
/* Check result and decide in which part to repeat search */
/* Compare with a value atleast one LSB's less than top to avoid overshooting */
/* Since oversampling is used, the result is 16 bits, but a couple of lsb's */
/* applies to the 12 bit result value, if 0xffe is the top value in 12 bit, this */
/* is in turn 0xffe0 in the 16 bit result. */
/* Calibration register has positive effect on result */
if (sample > 0xffd0)
{
/* Repeat search in bottom half. */
high = mid;
}
else if (sample < 0xffd0)
{
/* Repeat search in top half. */
low = mid + 1;
}
else
{
/* Found it, exit while loop */
break;
}
}
adc_debug("adc->CAL = %x\n", adc->CAL);
return adc->CAL;
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}
/***************************************************************************//**
* @brief
* Configure DMA for ADC
*
* @details
*
* @note
*
* @param[in] adc_device
* Pointer to ADC registers base address
*
* @param[in] mode
* ADC mode
*
* @param[in] channel
* DMA channel
******************************************************************************/
void efm32_adc_cfg_dma(
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ADC_TypeDef *adc_device,
rt_uint8_t mode,
rt_uint8_t channel)
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{
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DMA_CfgChannel_TypeDef chnlCfg;
DMA_CfgDescr_TypeDef descrCfg;
if (channel == (rt_uint8_t)EFM32_NO_DMA)
{
return;
}
/* Set up DMA channel */
chnlCfg.highPri = false;
chnlCfg.enableInt = false;
if (adc_device == ADC0)
{
switch (mode & ADC_MASK_MODE)
{
case ADC_MODE_SINGLE:
chnlCfg.select = DMAREQ_ADC0_SINGLE;
break;
case ADC_MODE_SCAN:
chnlCfg.select = DMAREQ_ADC0_SCAN;
break;
default:
return;
}
}
else
{
// TODO: Any other channel?
return;
}
chnlCfg.cb = RT_NULL;
DMA_CfgChannel((rt_uint32_t)channel, &chnlCfg);
/* Setting up DMA channel descriptor */
descrCfg.dstInc = dmaDataInc4;
descrCfg.srcInc = dmaDataIncNone;
descrCfg.size = dmaDataSize4;
descrCfg.arbRate = dmaArbitrate1;
descrCfg.hprot = 0;
DMA_CfgDescr((rt_uint32_t)channel, true, &descrCfg);
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}
/***************************************************************************//**
* @brief
* Activate DMA for ADC
*
* @details
*
* @note
*
* @param[in] adc_device
* Pointer to ADC registers base address
*
* @param[in] mode
* ADC mode
*
* @param[in] count
* ADC channel count
*
* @param[in] channel
* DMA channel
*
* @param[out] buffer
* Pointer to ADC results buffer
******************************************************************************/
void efm32_adc_on_dma(
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ADC_TypeDef *adc_device,
rt_uint8_t mode,
rt_uint8_t count,
rt_uint8_t channel,
void *buffer)
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{
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switch (mode & ADC_MASK_MODE)
{
case ADC_MODE_SINGLE:
/* Activate DMA */
DMA_ActivateBasic(
(rt_uint32_t)channel,
true,
false,
buffer,
(void *)&(adc_device->SINGLEDATA),
count - 1);
break;
case ADC_MODE_SCAN:
DMA_ActivateBasic(
(rt_uint32_t)channel,
true,
false,
buffer,
(void *)&(adc_device->SCANDATA),
count - 1);
break;
default:
return;
}
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}
/***************************************************************************//**
* @brief
* Initialize ADC device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @return
* Error code
******************************************************************************/
static rt_err_t rt_adc_init(rt_device_t dev)
{
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RT_ASSERT(dev != RT_NULL);
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rt_uint32_t temp;
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struct efm32_adc_device_t *adc;
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adc = (struct efm32_adc_device_t *)(dev->user_data);
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temp = efm32_adc_calibration(adc->adc_device, ADC_CALI_REF, ADC_CALI_CH);
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adc_debug("adc->CAL = %x\n", temp);
return RT_EOK;
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}
/***************************************************************************//**
* @brief
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* Configure ADC device
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*
* @details
*
* @note
*
* @param[in] dev
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* Pointer to device descriptor
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*
* @param[in] cmd
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* ADC control command
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*
* @param[in] args
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* Arguments
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*
* @return
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* Error code
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******************************************************************************/
static rt_err_t rt_adc_control(
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rt_device_t dev,
rt_uint8_t cmd,
void *args)
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{
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RT_ASSERT(dev != RT_NULL);
struct efm32_adc_device_t *adc;
adc = (struct efm32_adc_device_t *)(dev->user_data);
switch (cmd)
{
case RT_DEVICE_CTRL_SUSPEND:
/* Suspend device */
dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
adc->adc_device->CMD = ADC_CMD_SINGLESTOP | ADC_CMD_SCANSTOP;
break;
case RT_DEVICE_CTRL_RESUME:
{
/* Resume device */
struct efm32_adc_result_t *control = \
(struct efm32_adc_result_t *)args;
dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
switch (control->mode)
{
case ADC_MODE_SINGLE:
if (adc->singleDmaChannel != (rt_uint8_t)EFM32_NO_DMA)
{
efm32_adc_on_dma(
adc->adc_device,
control->mode,
adc->singleCount,
adc->singleDmaChannel,
control->buffer);
}
ADC_Start(adc->adc_device, adcStartSingle);
break;
case ADC_MODE_SCAN:
if (adc->scanDmaChannel != (rt_uint8_t)EFM32_NO_DMA)
{
efm32_adc_on_dma(
adc->adc_device,
control->mode,
adc->scanCount,
adc->scanDmaChannel,
control->buffer);
}
ADC_Start(adc->adc_device, adcStartScan);
break;
case ADC_MODE_TAILGATE:
{
void *index = control->buffer;
if (adc->scanDmaChannel != (rt_uint8_t)EFM32_NO_DMA)
{
efm32_adc_on_dma(
adc->adc_device,
control->mode,
adc->scanCount,
adc->scanDmaChannel,
index);
index += adc->scanCount;
}
if (adc->singleDmaChannel != (rt_uint8_t)EFM32_NO_DMA)
{
efm32_adc_on_dma(
adc->adc_device,
control->mode,
adc->singleCount,
adc->singleDmaChannel,
index);
index += adc->singleCount;
}
ADC_Start(adc->adc_device, adcStartScanAndSingle);
}
break;
default:
return -RT_ERROR;
}
}
break;
case RT_DEVICE_CTRL_ADC_MODE:
{
/* change device setting */
struct efm32_adc_control_t *control = \
(struct efm32_adc_control_t *)args;
switch (control->mode)
{
case ADC_MODE_SINGLE:
ADC_InitSingle(adc->adc_device, control->single.init);
break;
case ADC_MODE_SCAN:
ADC_InitScan(adc->adc_device, control->scan.init);
break;
case ADC_MODE_TAILGATE:
ADC_InitSingle(adc->adc_device, control->single.init);
ADC_InitScan(adc->adc_device, control->scan.init);
break;
default:
return -RT_ERROR;
}
if (control->mode == ADC_MODE_TAILGATE)
{
adc->mode = ADC_MODE_TAILGATE;
}
else
{
adc->mode &= ~(rt_uint8_t)ADC_MODE_TAILGATE;
adc->mode |= control->mode;
}
if ((control->mode == ADC_MODE_TAILGATE) || \
(control->mode == ADC_MODE_SINGLE))
{
if (control->single.init->rep)
{
adc->mode |= ADC_OP_SINGLE_REPEAT;
}
adc->singleCount = control->single.count;
adc->singleDmaChannel = control->single.dmaChannel;
efm32_adc_cfg_dma(adc->adc_device, control->mode, adc->singleDmaChannel);
}
if ((control->mode == ADC_MODE_TAILGATE) || \
(control->mode == ADC_MODE_SCAN))
{
if (control->scan.init->rep)
{
adc->mode |= ADC_OP_SCAN_REPEAT;
}
adc->scanCount = control->scan.count;
adc->scanDmaChannel = control->scan.dmaChannel;
efm32_adc_cfg_dma(adc->adc_device, control->mode, adc->scanDmaChannel);
}
}
break;
case RT_DEVICE_CTRL_ADC_RESULT:
{
struct efm32_adc_result_t *control = \
(struct efm32_adc_result_t *)args;
switch (control->mode)
{
case ADC_MODE_SINGLE:
if (adc->singleDmaChannel != (rt_uint8_t)EFM32_NO_DMA)
{
if (adc->mode & ADC_OP_SINGLE_REPEAT)
{
if (!(DMA->IF & (1 << adc->singleDmaChannel)))
{
efm32_adc_on_dma(
adc->adc_device,
control->mode,
adc->singleCount,
adc->singleDmaChannel,
control->buffer);
}
while (!(DMA->IF & (1 << adc->singleDmaChannel)));
}
else
{
while (adc->adc_device->STATUS & ADC_STATUS_SINGLEACT);
}
}
else
{
while (adc->adc_device->STATUS & ADC_STATUS_SINGLEACT);
*((rt_uint32_t *)control->buffer) = \
ADC_DataSingleGet(adc->adc_device) << adcErrataShift;
}
break;
case ADC_MODE_SCAN:
if (adc->scanDmaChannel != (rt_uint8_t)EFM32_NO_DMA)
{
if (adc->mode & ADC_OP_SCAN_REPEAT)
{
if (!(DMA->IF & (1 << adc->scanDmaChannel)))
{
efm32_adc_on_dma(
adc->adc_device,
control->mode,
adc->scanCount,
adc->scanDmaChannel,
control->buffer);
}
while (!(DMA->IF & (1 << adc->scanDmaChannel)));
}
else
{
while (adc->adc_device->STATUS & ADC_STATUS_SCANACT);
}
}
else
{
while (adc->adc_device->STATUS & ADC_STATUS_SCANACT);
*((rt_uint32_t *)control->buffer) = \
ADC_DataScanGet(adc->adc_device) << adcErrataShift;
}
break;
case ADC_MODE_TAILGATE:
{
void *index = control->buffer;
if ((adc->scanDmaChannel != (rt_uint8_t)EFM32_NO_DMA) && \
!(adc->mode & ADC_OP_SCAN_REPEAT))
{
index += adc->scanCount;
}
if ((adc->singleDmaChannel != (rt_uint8_t)EFM32_NO_DMA) && \
!(adc->mode & ADC_OP_SINGLE_REPEAT))
{
index += adc->singleCount;
}
if (adc->scanDmaChannel != (rt_uint8_t)EFM32_NO_DMA)
{
if (adc->mode & ADC_OP_SCAN_REPEAT)
{
if (!(DMA->IF & (1 << adc->scanDmaChannel)))
{
efm32_adc_on_dma(
adc->adc_device,
control->mode,
adc->scanCount,
adc->scanDmaChannel,
index);
index += adc->scanCount;
}
while (!(DMA->IF & (1 << adc->scanDmaChannel)));
}
else
{
while (adc->adc_device->STATUS & ADC_STATUS_SCANACT);
}
}
else
{
while (adc->adc_device->STATUS & ADC_STATUS_SCANACT);
*(rt_uint32_t *)(index++) = \
ADC_DataScanGet(adc->adc_device) << adcErrataShift;
}
if (adc->singleDmaChannel != (rt_uint8_t)EFM32_NO_DMA)
{
if (adc->mode & ADC_OP_SINGLE_REPEAT)
{
if (!(DMA->IF & (1 << adc->singleDmaChannel)))
{
efm32_adc_on_dma(
adc->adc_device,
control->mode,
adc->singleCount,
adc->singleDmaChannel,
index);
index += adc->singleCount;
}
while (!(DMA->IF & (1 << adc->singleDmaChannel)));
}
else
{
while (adc->adc_device->STATUS & ADC_STATUS_SINGLEACT);
}
}
else
{
while (adc->adc_device->STATUS & ADC_STATUS_SINGLEACT);
*(rt_uint32_t *)(index++) = \
ADC_DataSingleGet(adc->adc_device) << adcErrataShift;
}
}
break;
default:
return -RT_ERROR;
}
}
break;
default:
return -RT_ERROR;
}
return RT_EOK;
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}
/***************************************************************************//**
* @brief
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* Register ADC device
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*
* @details
*
* @note
*
* @param[in] device
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* Pointer to device descriptor
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*
* @param[in] name
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* Device name
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*
* @param[in] flag
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* Configuration flags
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*
* @param[in] adc
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* Pointer to ADC device descriptor
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*
* @return
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* Error code
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******************************************************************************/
rt_err_t rt_hw_adc_register(
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rt_device_t device,
const char *name,
rt_uint32_t flag,
struct efm32_adc_device_t *adc)
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{
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RT_ASSERT(device != RT_NULL);
device->type = RT_Device_Class_Char; /* fixme: should be adc type */
device->rx_indicate = RT_NULL;
device->tx_complete = RT_NULL;
device->init = rt_adc_init;
device->open = RT_NULL;
device->close = RT_NULL;
device->read = RT_NULL;
device->write = RT_NULL;
device->control = rt_adc_control;
device->user_data = adc;
/* register a character device */
return rt_device_register(device, name, flag);
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}
/***************************************************************************//**
* @brief
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* Initialize the specified ADC unit
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*
* @details
*
* @note
*
* @param[in] device
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* Pointer to device descriptor
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*
* @param[in] unitNumber
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* Unit number
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*
* @return
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* Pointer to ADC device
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******************************************************************************/
static struct efm32_adc_device_t *rt_hw_adc_unit_init(
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rt_device_t device,
rt_uint8_t unitNumber)
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{
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struct efm32_adc_device_t *adc;
CMU_Clock_TypeDef adcClock;
ADC_Init_TypeDef init = ADC_INIT_DEFAULT;
do
{
/* Allocate device and set default value */
adc = rt_malloc(sizeof(struct efm32_adc_device_t));
if (adc == RT_NULL)
{
adc_debug("no memory for ADC%d driver\n", unitNumber);
break;
}
adc->mode = 0;
adc->singleCount = 0;
adc->singleDmaChannel = (rt_uint8_t)EFM32_NO_DMA;
adc->scanCount = 0;
adc->scanDmaChannel = (rt_uint8_t)EFM32_NO_DMA;
/* Initialization */
if (unitNumber >= ADC_COUNT)
{
break;
}
switch (unitNumber)
{
case 0:
adc->adc_device = ADC0;
adcClock = (CMU_Clock_TypeDef)cmuClock_ADC0;
break;
default:
break;
}
/* Enable ADC clock */
CMU_ClockEnable(adcClock, true);
/* Reset */
ADC_Reset(adc->adc_device);
/* Configure ADC */
// TODO: Fixed oversampling rate?
init.ovsRateSel = adcOvsRateSel4096;
init.timebase = ADC_TimebaseCalc(0);
init.prescale = ADC_PrescaleCalc(ADC_CONVERT_FREQUENCY, 0);
ADC_Init(adc->adc_device, &init);
return adc;
} while(0);
if (adc)
{
rt_free(adc);
}
rt_kprintf("ADC: Init failed!\n");
return RT_NULL;
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}
/***************************************************************************//**
* @brief
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* Initialize all ADC module related hardware and register ADC device to kernel
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*
* @details
*
* @note
*
******************************************************************************/
void rt_hw_adc_init(void)
{
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SYSTEM_ChipRevision_TypeDef chipRev;
struct efm32_adc_device_t *adc;
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#ifdef RT_USING_ADC0
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if ((adc = rt_hw_adc_unit_init(&adc0_device, 0)) != RT_NULL)
{
rt_hw_adc_register(&adc0_device, RT_ADC0_NAME, EFM32_NO_DATA, adc);
}
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#endif
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/* ADC errata for rev B when using VDD as reference, need to multiply */
/* result by 2 */
SYSTEM_ChipRevisionGet(&chipRev);
if ((chipRev.major == 0x01) && (chipRev.minor == 0x01))
{
adcErrataShift = 1;
}
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}
#endif
/***************************************************************************//**
* @}
******************************************************************************/