mirror of https://github.com/ARMmbed/mbed-os.git
218 lines
8.2 KiB
C
218 lines
8.2 KiB
C
/*******************************************************************************
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* Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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*******************************************************************************
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*/
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#include "mbed_assert.h"
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#include "analogout_api.h"
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#include "clkman_regs.h"
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#include "pwrman_regs.h"
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#include "afe_regs.h"
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#include "PeripheralPins.h"
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//******************************************************************************
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void analogout_init(dac_t *obj, PinName pin)
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{
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// Make sure pin is an analog pin we can use for ADC
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DACName dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
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MBED_ASSERT((DACName)dac != (DACName)NC);
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// Set the object pointer
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obj->dac = ((mxc_dac_regs_t*)MXC_DAC_GET_DAC((pin & 0x3)));
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obj->dac_fifo = ((mxc_dac_fifo_regs_t*)MXC_DAC_GET_FIFO((pin & 0x3)));
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obj->index = (pin & 0x3);
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// Set the ADC clock to the system clock frequency
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MXC_SET_FIELD(&MXC_CLKMAN->clk_ctrl, MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT,
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(MXC_F_CLKMAN_CLK_CTRL_ADC_GATE_N | (MXC_E_CLKMAN_ADC_SOURCE_SELECT_SYSTEM <<
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MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT_POS)));
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// Setup the OPAMP in follower mode
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switch(obj->index) {
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case 0:
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// Enable DAC clock
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MXC_CLKMAN->clk_ctrl_14_dac0 = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
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// Enable OPAMP
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MXC_AFE->ctrl5 &= ~MXC_F_AFE_CTRL5_OP_CMP0;
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// Set the positive and negative inputs
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MXC_SET_FIELD(&MXC_AFE->ctrl4, (MXC_F_AFE_CTRL4_DAC_SEL_A |
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MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP0 | MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP0),
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((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP0_POS) |
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(0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP0_POS) |
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(0x0 << MXC_F_AFE_CTRL4_DAC_SEL_A_POS)));
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// Enable N and P channel inputs
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MXC_AFE->ctrl3 |= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP0 |
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MXC_F_AFE_CTRL3_EN_NCH_OPAMP0);
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break;
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case 1:
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// Enable DAC clock
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MXC_CLKMAN->clk_ctrl_15_dac1 = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
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// Enable OPAMP
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MXC_AFE->ctrl5 &= ~MXC_F_AFE_CTRL5_OP_CMP1;
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// Set the positive and negative inputs
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MXC_SET_FIELD(&MXC_AFE->ctrl4, (MXC_F_AFE_CTRL4_DAC_SEL_B |
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MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP1 | MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP1),
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((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP1_POS) |
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(0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP1_POS) |
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(0x1 << MXC_F_AFE_CTRL4_DAC_SEL_B_POS)));
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// Enable N and P channel inputs
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MXC_AFE->ctrl3 |= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP1 |
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MXC_F_AFE_CTRL3_EN_NCH_OPAMP1);
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break;
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case 2:
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// Enable DAC clock
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MXC_CLKMAN->clk_ctrl_16_dac2 = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
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// Enable OPAMP
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MXC_AFE->ctrl5 &= ~MXC_F_AFE_CTRL5_OP_CMP2;
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// Set the positive and negative inputs
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MXC_SET_FIELD(&MXC_AFE->ctrl4, (MXC_F_AFE_CTRL4_DAC_SEL_C |
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MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP2 | MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP2),
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((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP2_POS) |
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(0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP2_POS) |
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(0x2 << MXC_F_AFE_CTRL4_DAC_SEL_C_POS)));
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// Enable N and P channel inputs
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MXC_AFE->ctrl3 |= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP2 |
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MXC_F_AFE_CTRL3_EN_NCH_OPAMP2);
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break;
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case 3:
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// Enable DAC clock
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MXC_CLKMAN->clk_ctrl_17_dac3 = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
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// Enable OPAMP
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MXC_AFE->ctrl5 &= ~MXC_F_AFE_CTRL5_OP_CMP3;
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// Set the positive and negative inputs
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MXC_SET_FIELD(&MXC_AFE->ctrl4, (MXC_F_AFE_CTRL4_DAC_SEL_D |
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MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP3 | MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP3),
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((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP3_POS) |
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(0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP3_POS) |
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(0x3 << MXC_F_AFE_CTRL4_DAC_SEL_D_POS)));
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// Enable N and P channel inputs
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MXC_AFE->ctrl3 |= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP3 |
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MXC_F_AFE_CTRL3_EN_NCH_OPAMP3);
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break;
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}
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// Enable AFE power
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MXC_PWRMAN->pwr_rst_ctrl |= MXC_F_PWRMAN_PWR_RST_CTRL_AFE_POWERED;
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// Setup internal voltage references
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MXC_SET_FIELD(&MXC_AFE->ctrl1, (MXC_F_AFE_CTRL1_REF_DAC_VOLT_SEL | MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL),
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(MXC_F_AFE_CTRL1_REF_ADC_POWERUP | MXC_F_AFE_CTRL1_REF_BLK_POWERUP |
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(MXC_E_AFE_REF_VOLT_SEL_1500 << MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL_POS)));
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// Disable interpolation
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obj->dac->ctrl0 &= ~MXC_F_DAC_CTRL0_INTERP_MODE;
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}
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//******************************************************************************
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void analogout_write(dac_t *obj, float value)
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{
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analogout_write_u16(obj, (uint16_t)((value/1.0) * 0xFFFF));
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}
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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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// Enable the OPAMP
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// Setup the OPAMP in follower mode
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switch(obj->index) {
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case 0:
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MXC_AFE->ctrl3 |= MXC_F_AFE_CTRL3_POWERUP_OPAMP0;
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break;
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case 1:
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MXC_AFE->ctrl3 |= MXC_F_AFE_CTRL3_POWERUP_OPAMP1;
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break;
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case 2:
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MXC_AFE->ctrl3 |= MXC_F_AFE_CTRL3_POWERUP_OPAMP2;
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break;
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case 3:
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MXC_AFE->ctrl3 |= MXC_F_AFE_CTRL3_POWERUP_OPAMP3;
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break;
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}
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// Output 1 sample with minimal delay
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obj->dac->rate |= 0x1;
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// Set the start mode to output once data is in the FIFO
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obj->dac->ctrl0 &= ~(MXC_F_DAC_CTRL0_START_MODE | MXC_F_DAC_CTRL0_OP_MODE);
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// Enable the DAC
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obj->dac->ctrl0 |= (MXC_F_DAC_CTRL0_POWER_MODE_2 |
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MXC_F_DAC_CTRL0_POWER_MODE_1_0 | MXC_F_DAC_CTRL0_POWER_ON |
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MXC_F_DAC_CTRL0_CLOCK_GATE_EN | MXC_F_DAC_CTRL0_CPU_START);
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if(obj->index < 2) {
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obj->out = (value);
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obj->dac_fifo->output_16 = (obj->out);
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} else {
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// Convert 16 bits to 8 bits
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obj->out = (value >> 8);
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obj->dac_fifo->output_8 = (obj->out);
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}
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}
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//******************************************************************************
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float analogout_read(dac_t *obj)
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{
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return (((float)analogout_read_u16(obj) / (float)0xFFFF) * 1.5);
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}
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//******************************************************************************
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uint16_t analogout_read_u16(dac_t *obj)
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{
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if(obj->index < 2) {
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// Convert 12 bits to 16 bits
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return (obj->out << 4);
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} else {
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// Convert 8 bits to 16 bits
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return (obj->out << 8);
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}
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}
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const PinMap *analogout_pinmap()
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{
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return PinMap_DAC;
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}
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