Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Maxim/TARGET_MAX32610/analogout_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
144:ef7eb2e8f9f7
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /*******************************************************************************
bogdanm 0:9b334a45a8ff 2 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Permission is hereby granted, free of charge, to any person obtaining a
bogdanm 0:9b334a45a8ff 5 * copy of this software and associated documentation files (the "Software"),
bogdanm 0:9b334a45a8ff 6 * to deal in the Software without restriction, including without limitation
bogdanm 0:9b334a45a8ff 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
bogdanm 0:9b334a45a8ff 8 * and/or sell copies of the Software, and to permit persons to whom the
bogdanm 0:9b334a45a8ff 9 * Software is furnished to do so, subject to the following conditions:
bogdanm 0:9b334a45a8ff 10 *
bogdanm 0:9b334a45a8ff 11 * The above copyright notice and this permission notice shall be included
bogdanm 0:9b334a45a8ff 12 * in all copies or substantial portions of the Software.
bogdanm 0:9b334a45a8ff 13 *
bogdanm 0:9b334a45a8ff 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
bogdanm 0:9b334a45a8ff 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
bogdanm 0:9b334a45a8ff 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
bogdanm 0:9b334a45a8ff 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
bogdanm 0:9b334a45a8ff 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
bogdanm 0:9b334a45a8ff 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
bogdanm 0:9b334a45a8ff 20 * OTHER DEALINGS IN THE SOFTWARE.
bogdanm 0:9b334a45a8ff 21 *
bogdanm 0:9b334a45a8ff 22 * Except as contained in this notice, the name of Maxim Integrated
bogdanm 0:9b334a45a8ff 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
bogdanm 0:9b334a45a8ff 24 * Products, Inc. Branding Policy.
bogdanm 0:9b334a45a8ff 25 *
bogdanm 0:9b334a45a8ff 26 * The mere transfer of this software does not imply any licenses
bogdanm 0:9b334a45a8ff 27 * of trade secrets, proprietary technology, copyrights, patents,
bogdanm 0:9b334a45a8ff 28 * trademarks, maskwork rights, or any other form of intellectual
bogdanm 0:9b334a45a8ff 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
bogdanm 0:9b334a45a8ff 30 * ownership rights.
bogdanm 0:9b334a45a8ff 31 *******************************************************************************
bogdanm 0:9b334a45a8ff 32 */
bogdanm 0:9b334a45a8ff 33
bogdanm 0:9b334a45a8ff 34 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 35 #include "analogout_api.h"
bogdanm 0:9b334a45a8ff 36 #include "clkman_regs.h"
bogdanm 0:9b334a45a8ff 37 #include "pwrman_regs.h"
bogdanm 0:9b334a45a8ff 38 #include "afe_regs.h"
bogdanm 0:9b334a45a8ff 39 #include "PeripheralPins.h"
bogdanm 0:9b334a45a8ff 40
bogdanm 0:9b334a45a8ff 41 //******************************************************************************
bogdanm 0:9b334a45a8ff 42 void analogout_init(dac_t *obj, PinName pin)
bogdanm 0:9b334a45a8ff 43 {
bogdanm 0:9b334a45a8ff 44 // Make sure pin is an analog pin we can use for ADC
bogdanm 0:9b334a45a8ff 45 DACName dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
bogdanm 0:9b334a45a8ff 46 MBED_ASSERT((DACName)dac != (DACName)NC);
bogdanm 0:9b334a45a8ff 47
bogdanm 0:9b334a45a8ff 48 // Set the object pointer
bogdanm 0:9b334a45a8ff 49 obj->dac = ((mxc_dac_regs_t*)MXC_DAC_GET_DAC((pin & 0x3)));
bogdanm 0:9b334a45a8ff 50 obj->dac_fifo = ((mxc_dac_fifo_t*)MXC_DAC_GET_FIFO((pin & 0x3)));
bogdanm 0:9b334a45a8ff 51 obj->index = (pin & 0x3);
bogdanm 0:9b334a45a8ff 52
bogdanm 0:9b334a45a8ff 53 // Set the ADC clock to the system clock frequency
bogdanm 0:9b334a45a8ff 54 MXC_SET_FIELD(&MXC_CLKMAN->clk_ctrl, MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT,
bogdanm 0:9b334a45a8ff 55 (MXC_F_CLKMAN_CLK_CTRL_ADC_GATE_N | (MXC_E_CLKMAN_ADC_SOURCE_SELECT_SYSTEM <<
bogdanm 0:9b334a45a8ff 56 MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT_POS)));
bogdanm 0:9b334a45a8ff 57
bogdanm 0:9b334a45a8ff 58
bogdanm 0:9b334a45a8ff 59 // Setup the OPAMP in follower mode
bogdanm 0:9b334a45a8ff 60 switch(obj->index) {
bogdanm 0:9b334a45a8ff 61 case 0:
bogdanm 0:9b334a45a8ff 62 // Enable DAC clock
bogdanm 0:9b334a45a8ff 63 MXC_CLKMAN->clk_ctrl_14_dac0 = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
bogdanm 0:9b334a45a8ff 64
bogdanm 0:9b334a45a8ff 65 // Enable OPAMP
bogdanm 0:9b334a45a8ff 66 MXC_AFE->ctrl5 &= ~MXC_F_AFE_CTRL5_OP_CMP0;
bogdanm 0:9b334a45a8ff 67
bogdanm 0:9b334a45a8ff 68 // Set the positive and negative inputs
bogdanm 0:9b334a45a8ff 69 MXC_SET_FIELD(&MXC_AFE->ctrl4, (MXC_F_AFE_CTRL4_DAC_SEL_A |
bogdanm 0:9b334a45a8ff 70 MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP0 | MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP0),
bogdanm 0:9b334a45a8ff 71 ((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP0_POS) |
bogdanm 0:9b334a45a8ff 72 (0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP0_POS) |
bogdanm 0:9b334a45a8ff 73 (0x0 << MXC_F_AFE_CTRL4_DAC_SEL_A_POS)));
bogdanm 0:9b334a45a8ff 74
bogdanm 0:9b334a45a8ff 75 // Enable N and P channel inputs
bogdanm 0:9b334a45a8ff 76 MXC_AFE->ctrl3 |= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP0 |
bogdanm 0:9b334a45a8ff 77 MXC_F_AFE_CTRL3_EN_NCH_OPAMP0);
bogdanm 0:9b334a45a8ff 78 break;
bogdanm 0:9b334a45a8ff 79 case 1:
bogdanm 0:9b334a45a8ff 80 // Enable DAC clock
bogdanm 0:9b334a45a8ff 81 MXC_CLKMAN->clk_ctrl_15_dac1 = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
bogdanm 0:9b334a45a8ff 82
bogdanm 0:9b334a45a8ff 83 // Enable OPAMP
bogdanm 0:9b334a45a8ff 84 MXC_AFE->ctrl5 &= ~MXC_F_AFE_CTRL5_OP_CMP1;
bogdanm 0:9b334a45a8ff 85
bogdanm 0:9b334a45a8ff 86 // Set the positive and negative inputs
bogdanm 0:9b334a45a8ff 87 MXC_SET_FIELD(&MXC_AFE->ctrl4, (MXC_F_AFE_CTRL4_DAC_SEL_B |
bogdanm 0:9b334a45a8ff 88 MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP1 | MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP1),
bogdanm 0:9b334a45a8ff 89 ((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP1_POS) |
bogdanm 0:9b334a45a8ff 90 (0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP1_POS) |
bogdanm 0:9b334a45a8ff 91 (0x1 << MXC_F_AFE_CTRL4_DAC_SEL_B_POS)));
bogdanm 0:9b334a45a8ff 92
bogdanm 0:9b334a45a8ff 93 // Enable N and P channel inputs
bogdanm 0:9b334a45a8ff 94 MXC_AFE->ctrl3 |= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP1 |
bogdanm 0:9b334a45a8ff 95 MXC_F_AFE_CTRL3_EN_NCH_OPAMP1);
bogdanm 0:9b334a45a8ff 96
bogdanm 0:9b334a45a8ff 97 break;
bogdanm 0:9b334a45a8ff 98 case 2:
bogdanm 0:9b334a45a8ff 99 // Enable DAC clock
bogdanm 0:9b334a45a8ff 100 MXC_CLKMAN->clk_ctrl_16_dac2 = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
bogdanm 0:9b334a45a8ff 101
bogdanm 0:9b334a45a8ff 102 // Enable OPAMP
bogdanm 0:9b334a45a8ff 103 MXC_AFE->ctrl5 &= ~MXC_F_AFE_CTRL5_OP_CMP2;
bogdanm 0:9b334a45a8ff 104
bogdanm 0:9b334a45a8ff 105 // Set the positive and negative inputs
bogdanm 0:9b334a45a8ff 106 MXC_SET_FIELD(&MXC_AFE->ctrl4, (MXC_F_AFE_CTRL4_DAC_SEL_C |
bogdanm 0:9b334a45a8ff 107 MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP2 | MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP2),
bogdanm 0:9b334a45a8ff 108 ((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP2_POS) |
bogdanm 0:9b334a45a8ff 109 (0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP2_POS) |
bogdanm 0:9b334a45a8ff 110 (0x2 << MXC_F_AFE_CTRL4_DAC_SEL_C_POS)));
bogdanm 0:9b334a45a8ff 111
bogdanm 0:9b334a45a8ff 112 // Enable N and P channel inputs
bogdanm 0:9b334a45a8ff 113 MXC_AFE->ctrl3 |= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP2 |
bogdanm 0:9b334a45a8ff 114 MXC_F_AFE_CTRL3_EN_NCH_OPAMP2);
bogdanm 0:9b334a45a8ff 115 break;
bogdanm 0:9b334a45a8ff 116 case 3:
bogdanm 0:9b334a45a8ff 117 // Enable DAC clock
bogdanm 0:9b334a45a8ff 118 MXC_CLKMAN->clk_ctrl_17_dac3 = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
bogdanm 0:9b334a45a8ff 119
bogdanm 0:9b334a45a8ff 120 // Enable OPAMP
bogdanm 0:9b334a45a8ff 121 MXC_AFE->ctrl5 &= ~MXC_F_AFE_CTRL5_OP_CMP3;
bogdanm 0:9b334a45a8ff 122
bogdanm 0:9b334a45a8ff 123 // Set the positive and negative inputs
bogdanm 0:9b334a45a8ff 124 MXC_SET_FIELD(&MXC_AFE->ctrl4, (MXC_F_AFE_CTRL4_DAC_SEL_D |
bogdanm 0:9b334a45a8ff 125 MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP3 | MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP3),
bogdanm 0:9b334a45a8ff 126 ((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP3_POS) |
bogdanm 0:9b334a45a8ff 127 (0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP3_POS) |
bogdanm 0:9b334a45a8ff 128 (0x3 << MXC_F_AFE_CTRL4_DAC_SEL_D_POS)));
bogdanm 0:9b334a45a8ff 129
bogdanm 0:9b334a45a8ff 130 // Enable N and P channel inputs
bogdanm 0:9b334a45a8ff 131 MXC_AFE->ctrl3 |= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP3 |
bogdanm 0:9b334a45a8ff 132 MXC_F_AFE_CTRL3_EN_NCH_OPAMP3);
bogdanm 0:9b334a45a8ff 133 break;
bogdanm 0:9b334a45a8ff 134 }
bogdanm 0:9b334a45a8ff 135
bogdanm 0:9b334a45a8ff 136 // Enable AFE power
bogdanm 0:9b334a45a8ff 137 MXC_PWRMAN->pwr_rst_ctrl |= MXC_F_PWRMAN_PWR_RST_CTRL_AFE_POWERED;
bogdanm 0:9b334a45a8ff 138
bogdanm 0:9b334a45a8ff 139 // Setup internal voltage references
bogdanm 0:9b334a45a8ff 140 MXC_SET_FIELD(&MXC_AFE->ctrl1, (MXC_F_AFE_CTRL1_REF_DAC_VOLT_SEL | MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL),
bogdanm 0:9b334a45a8ff 141 (MXC_F_AFE_CTRL1_REF_ADC_POWERUP | MXC_F_AFE_CTRL1_REF_BLK_POWERUP |
bogdanm 0:9b334a45a8ff 142 (MXC_E_AFE_REF_VOLT_SEL_1500 << MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL_POS)));
bogdanm 0:9b334a45a8ff 143
bogdanm 0:9b334a45a8ff 144 // Disable interpolation
bogdanm 0:9b334a45a8ff 145 obj->dac->ctrl0 &= MXC_F_DAC_CTRL0_INTERP_MODE;
bogdanm 0:9b334a45a8ff 146 }
bogdanm 0:9b334a45a8ff 147
bogdanm 0:9b334a45a8ff 148 //******************************************************************************
bogdanm 0:9b334a45a8ff 149 void analogout_write(dac_t *obj, float value)
bogdanm 0:9b334a45a8ff 150 {
bogdanm 0:9b334a45a8ff 151 analogout_write_u16(obj, (uint16_t)((value/1.0) * 0xFFFF));
bogdanm 0:9b334a45a8ff 152 }
bogdanm 0:9b334a45a8ff 153
bogdanm 0:9b334a45a8ff 154 //******************************************************************************
bogdanm 0:9b334a45a8ff 155 void analogout_write_u16(dac_t *obj, uint16_t value)
bogdanm 0:9b334a45a8ff 156 {
bogdanm 0:9b334a45a8ff 157 // Enable the OPAMP
bogdanm 0:9b334a45a8ff 158 // Setup the OPAMP in follower mode
bogdanm 0:9b334a45a8ff 159 switch(obj->index) {
bogdanm 0:9b334a45a8ff 160 case 0:
bogdanm 0:9b334a45a8ff 161 MXC_AFE->ctrl3 |= MXC_F_AFE_CTRL3_POWERUP_OPAMP0;
bogdanm 0:9b334a45a8ff 162 break;
bogdanm 0:9b334a45a8ff 163 case 1:
bogdanm 0:9b334a45a8ff 164 MXC_AFE->ctrl3 |= MXC_F_AFE_CTRL3_POWERUP_OPAMP1;
bogdanm 0:9b334a45a8ff 165 break;
bogdanm 0:9b334a45a8ff 166 case 2:
bogdanm 0:9b334a45a8ff 167 MXC_AFE->ctrl3 |= MXC_F_AFE_CTRL3_POWERUP_OPAMP2;
bogdanm 0:9b334a45a8ff 168 break;
bogdanm 0:9b334a45a8ff 169 case 3:
bogdanm 0:9b334a45a8ff 170 MXC_AFE->ctrl3 |= MXC_F_AFE_CTRL3_POWERUP_OPAMP3;
bogdanm 0:9b334a45a8ff 171 break;
bogdanm 0:9b334a45a8ff 172 }
bogdanm 0:9b334a45a8ff 173
bogdanm 0:9b334a45a8ff 174 // Output 1 sample with minimal delay
bogdanm 0:9b334a45a8ff 175 obj->dac->rate |= 0x1;
bogdanm 0:9b334a45a8ff 176
bogdanm 0:9b334a45a8ff 177 // Set the start mode to output once data is in the FIFO
bogdanm 0:9b334a45a8ff 178 obj->dac->ctrl0 &= ~(MXC_F_DAC_CTRL0_START_MODE | MXC_F_DAC_CTRL0_OP_MODE);
bogdanm 0:9b334a45a8ff 179
bogdanm 0:9b334a45a8ff 180 // Enable the DAC
bogdanm 0:9b334a45a8ff 181 obj->dac->ctrl0 |= (MXC_F_DAC_CTRL0_POWER_MODE_2 |
bogdanm 0:9b334a45a8ff 182 MXC_F_DAC_CTRL0_POWER_MODE_1_0 | MXC_F_DAC_CTRL0_POWER_ON |
bogdanm 0:9b334a45a8ff 183 MXC_F_DAC_CTRL0_CLOCK_GATE_EN | MXC_F_DAC_CTRL0_CPU_START);
bogdanm 0:9b334a45a8ff 184
bogdanm 0:9b334a45a8ff 185 if(obj->index < 2) {
bogdanm 0:9b334a45a8ff 186 obj->out = (value);
bogdanm 0:9b334a45a8ff 187 obj->dac_fifo->output_16 = (obj->out);
bogdanm 0:9b334a45a8ff 188
bogdanm 0:9b334a45a8ff 189 } else {
bogdanm 0:9b334a45a8ff 190 // Convert 16 bits to 8 bits
bogdanm 0:9b334a45a8ff 191 obj->out = (value >> 8);
bogdanm 0:9b334a45a8ff 192 obj->dac_fifo->output_8 = (obj->out);
bogdanm 0:9b334a45a8ff 193 }
bogdanm 0:9b334a45a8ff 194 }
bogdanm 0:9b334a45a8ff 195
bogdanm 0:9b334a45a8ff 196 //******************************************************************************
bogdanm 0:9b334a45a8ff 197 float analogout_read(dac_t *obj)
bogdanm 0:9b334a45a8ff 198 {
bogdanm 0:9b334a45a8ff 199 return (((float)analogout_read_u16(obj) / (float)0xFFFF) * 1.5);
bogdanm 0:9b334a45a8ff 200 }
bogdanm 0:9b334a45a8ff 201
bogdanm 0:9b334a45a8ff 202 //******************************************************************************
bogdanm 0:9b334a45a8ff 203 uint16_t analogout_read_u16(dac_t *obj)
bogdanm 0:9b334a45a8ff 204 {
bogdanm 0:9b334a45a8ff 205 if(obj->index < 2) {
bogdanm 0:9b334a45a8ff 206 // Convert 12 bits to 16 bits
bogdanm 0:9b334a45a8ff 207 return (obj->out << 4);
bogdanm 0:9b334a45a8ff 208 } else {
bogdanm 0:9b334a45a8ff 209 // Convert 8 bits to 16 bits
bogdanm 0:9b334a45a8ff 210 return (obj->out << 8);
bogdanm 0:9b334a45a8ff 211 }
bogdanm 0:9b334a45a8ff 212 }