mirror of https://github.com/ARMmbed/mbed-os.git
190 lines
6.5 KiB
C
190 lines
6.5 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2013-2016 Realtek Semiconductor Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "objects.h"
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#include "analogout_api.h"
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#if CONFIG_DAC_EN
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#include "cmsis.h"
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#include "pinmap.h"
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#include <string.h>
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#define DAC_POSITIVE_FULL_SCALE 0x7E0
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#define DAC_NEGATIVE_FULL_SCALE 0x820
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/** \brief analogout_init:\n
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* to initialize DAC
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*
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* This function is mainly to initialize a DAC channel.
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* \para dac_t *: obj
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* \para PinName: pin
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*/
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void analogout_init(dac_t *obj, PinName pin)
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{
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uint32_t dac_idx;
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uint32_t DacTemp;
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PHAL_DAC_INIT_DAT pHalDacInitData = (PHAL_DAC_INIT_DAT)&(obj->DACpara);
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dac_idx = pin & 0x0F;
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/* Assign dac index */
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pHalDacInitData->DACIdx = dac_idx;
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pHalDacInitData->DACEn = DAC_DISABLE;
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pHalDacInitData->DACDataRate = DAC_DATA_RATE_250K;
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pHalDacInitData->DACEndian = DAC_DATA_ENDIAN_LITTLE;
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pHalDacInitData->DACBurstSz = 10;
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pHalDacInitData->DACDbgSel = DAC_DBG_SEL_DISABLE;
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pHalDacInitData->DACDscDbgSel = DAC_DSC_DBG_SEL_DISABLE;
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pHalDacInitData->DACBPDsc = DAC_BYPASS_DSC_SEL_DISABLE;
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pHalDacInitData->DACDeltaSig = 0;
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pHalDacInitData->DACAnaCtrl0 = 0;
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pHalDacInitData->DACAnaCtrl1 = 0;
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pHalDacInitData->DACIntrMSK = DAC_FEATURE_DISABLED;
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/* DAC Function and Clock Enable*/
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HalDACPinMuxInit(pHalDacInitData);
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HalDACInit8195a(pHalDacInitData);
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HAL_DAC_WRITE32(pHalDacInitData->DACIdx, REG_DAC_INTR_CTRL,
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(BIT_DAC_FIFO_FULL_EN |
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BIT_DAC_FIFO_OVERFLOW_EN |
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BIT_DAC_FIFO_STOP_EN |
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BIT_DAC__WRITE_ERROR_EN |
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BIT_DAC_DSC_OVERFLOW0_EN |
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BIT_DAC_DSC_OVERFLOW1_EN));
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DBG_DAC_INFO("INTR MSK:%x\n", HAL_DAC_READ32(pHalDacInitData->DACIdx,REG_DAC_INTR_CTRL));
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DacTemp = HAL_DAC_READ32(pHalDacInitData->DACIdx, REG_DAC_ANAPAR_DA1);
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DacTemp |= (BIT31);
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HAL_DAC_WRITE32(pHalDacInitData->DACIdx, REG_DAC_ANAPAR_DA1, DacTemp);
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DBG_DAC_INFO("REG_DAC_ANAPAR_DA1:%08x\n",HAL_DAC_READ32(pHalDacInitData->DACIdx, REG_DAC_ANAPAR_DA1));
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DacTemp = HAL_DAC_READ32(pHalDacInitData->DACIdx, REG_DAC_CTRL);
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DacTemp |= BIT3;
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HAL_DAC_WRITE32(pHalDacInitData->DACIdx, REG_DAC_CTRL, DacTemp);
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DBG_DAC_INFO("REG_DAC_CTRL:%08x\n",DacTemp);
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pHalDacInitData->DACEn = DAC_ENABLE;
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HalDACEnableRtl8195a(pHalDacInitData);
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osDelay(6); //hardware needs some time to get ready
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}
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/** \brief analogout_free:\n
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* to free DAC
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*
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* This function is mainly to free a DAC channel.
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* \para dac_t *: obj
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*/
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void analogout_free(dac_t *obj)
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{
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PHAL_DAC_INIT_DAT pHalDacInitData = (PHAL_DAC_INIT_DAT)&(obj->DACpara);
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HalDACPinMuxDeInit(pHalDacInitData);
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pHalDacInitData->DACEn = DAC_DISABLE;
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HalDACEnableRtl8195a(pHalDacInitData);
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}
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/** \brief analogout_write:\n
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* to execute analogout_write
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*
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* This function is mainly to execute analog output and the value is a ratio.
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* The upper/lower bound of DAC register input value is defined by
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* DAC_XXXXX_FULL_SCALE. The parameter "value" of this function should be
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* transfered to register value.
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*
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* \para dac_t * : obj
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* \para float : value
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*/
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void analogout_write(dac_t *obj, float value)
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{
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uint32_t dactemp;
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uint16_t dacnegtemp;
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PHAL_DAC_INIT_DAT pHalDacInitData = (PHAL_DAC_INIT_DAT)&(obj->DACpara);
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if (value < 0.0f) {
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HAL_DAC_WRITE32(pHalDacInitData->DACIdx, REG_DAC0_FIFO_WR, 0x00000000);
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} else if (value > 1.0f) {
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dactemp = (DAC_POSITIVE_FULL_SCALE<<16) | DAC_POSITIVE_FULL_SCALE;
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HAL_DAC_WRITE32(pHalDacInitData->DACIdx, REG_DAC0_FIFO_WR, dactemp);
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} else {
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if (value >= 0.5) {
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dactemp = (uint32_t)((((value-0.5)/0.5) * (2^12)) * DAC_POSITIVE_FULL_SCALE);
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dactemp = dactemp / (2^12);
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dactemp = (dactemp<<16) | dactemp;
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HAL_DAC_WRITE32(pHalDacInitData->DACIdx, REG_DAC0_FIFO_WR, dactemp);
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} else {
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dacnegtemp = (DAC_NEGATIVE_FULL_SCALE & 0x7FF);
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dacnegtemp = ((~dacnegtemp) + 1) & 0x7FF;
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dactemp = (uint32_t)(((0.5-value)/0.5) * (2^12) * dacnegtemp);
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dactemp = dactemp / (2^12);
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dactemp = 0x1000 - dactemp; //change to 2's complement
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dactemp = (dactemp<<16) | dactemp;
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HAL_DAC_WRITE32(pHalDacInitData->DACIdx, REG_DAC0_FIFO_WR, dactemp);
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}
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}
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}
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/** \brief analogout_write_u16:\n
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* to execute analogout_write_u16
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*
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* The register value of DAC input is a format of 2's complement.
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* The most maximum value of positive value drives DAC to output a voltage about 3.3V.
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* The most mimimum value of negative value drives DAC to output a voltage about 0.
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* And the middle value of 0x000 will drive DAC to output a voltage of half of max voltage.
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*
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* \para dac_t * : obj
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* \para float : value
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*/
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void analogout_write_u16(dac_t *obj, uint16_t value)
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{
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uint32_t dactemp;
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PHAL_DAC_INIT_DAT pHalDacInitData = (PHAL_DAC_INIT_DAT)&(obj->DACpara);
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/* To give a two point data */
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dactemp = (value << 16) | value;
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HAL_DAC_WRITE32(pHalDacInitData->DACIdx, REG_DAC0_FIFO_WR, dactemp);
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}
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/** \brief analogout_read_u16:\n
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* to read back analog output value in float format
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*
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* This function is NOT available in rtl8195a hardware design.
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* It always returns a fixed value of 0.0;
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* \para dac_t * : obj
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*/
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float analogout_read(dac_t *obj)
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{
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return (float)0.0;
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}
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/** \brief analogout_read_u16:\n
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* to read back analog output register value
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*
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* This function is NOT available in rtl8195a hardware design.
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* It always returns a fixed value of 0xFFFF;
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* \para dac_t * : obj
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*/
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uint16_t analogout_read_u16(dac_t *obj)
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{
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return (uint16_t)0xFFFF;
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}
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#endif
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