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@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /*******************************************************************************
<> 144:ef7eb2e8f9f7 2 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Permission is hereby granted, free of charge, to any person obtaining a
<> 144:ef7eb2e8f9f7 5 * copy of this software and associated documentation files (the "Software"),
<> 144:ef7eb2e8f9f7 6 * to deal in the Software without restriction, including without limitation
<> 144:ef7eb2e8f9f7 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
<> 144:ef7eb2e8f9f7 8 * and/or sell copies of the Software, and to permit persons to whom the
<> 144:ef7eb2e8f9f7 9 * Software is furnished to do so, subject to the following conditions:
<> 144:ef7eb2e8f9f7 10 *
<> 144:ef7eb2e8f9f7 11 * The above copyright notice and this permission notice shall be included
<> 144:ef7eb2e8f9f7 12 * in all copies or substantial portions of the Software.
<> 144:ef7eb2e8f9f7 13 *
<> 144:ef7eb2e8f9f7 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
<> 144:ef7eb2e8f9f7 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
<> 144:ef7eb2e8f9f7 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
<> 144:ef7eb2e8f9f7 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
<> 144:ef7eb2e8f9f7 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
<> 144:ef7eb2e8f9f7 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
<> 144:ef7eb2e8f9f7 20 * OTHER DEALINGS IN THE SOFTWARE.
<> 144:ef7eb2e8f9f7 21 *
<> 144:ef7eb2e8f9f7 22 * Except as contained in this notice, the name of Maxim Integrated
<> 144:ef7eb2e8f9f7 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
<> 144:ef7eb2e8f9f7 24 * Products, Inc. Branding Policy.
<> 144:ef7eb2e8f9f7 25 *
<> 144:ef7eb2e8f9f7 26 * The mere transfer of this software does not imply any licenses
<> 144:ef7eb2e8f9f7 27 * of trade secrets, proprietary technology, copyrights, patents,
<> 144:ef7eb2e8f9f7 28 * trademarks, maskwork rights, or any other form of intellectual
<> 144:ef7eb2e8f9f7 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
<> 144:ef7eb2e8f9f7 30 * ownership rights.
<> 144:ef7eb2e8f9f7 31 *******************************************************************************
<> 144:ef7eb2e8f9f7 32 */
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 35 #include "analogout_api.h"
<> 144:ef7eb2e8f9f7 36 #include "clkman_regs.h"
<> 144:ef7eb2e8f9f7 37 #include "pwrman_regs.h"
<> 144:ef7eb2e8f9f7 38 #include "afe_regs.h"
<> 144:ef7eb2e8f9f7 39 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 40
<> 144:ef7eb2e8f9f7 41 //******************************************************************************
<> 144:ef7eb2e8f9f7 42 void analogout_init(dac_t *obj, PinName pin)
<> 144:ef7eb2e8f9f7 43 {
<> 144:ef7eb2e8f9f7 44 // Make sure pin is an analog pin we can use for ADC
<> 144:ef7eb2e8f9f7 45 DACName dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 46 MBED_ASSERT((DACName)dac != (DACName)NC);
<> 144:ef7eb2e8f9f7 47
<> 144:ef7eb2e8f9f7 48 // Set the object pointer
<> 144:ef7eb2e8f9f7 49 obj->dac = ((mxc_dac_regs_t*)MXC_DAC_GET_DAC((pin & 0x3)));
<> 144:ef7eb2e8f9f7 50 obj->dac_fifo = ((mxc_dac_fifo_regs_t*)MXC_DAC_GET_FIFO((pin & 0x3)));
<> 144:ef7eb2e8f9f7 51 obj->index = (pin & 0x3);
<> 144:ef7eb2e8f9f7 52
<> 144:ef7eb2e8f9f7 53 // Set the ADC clock to the system clock frequency
<> 144:ef7eb2e8f9f7 54 MXC_SET_FIELD(&MXC_CLKMAN->clk_ctrl, MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT,
<> 144:ef7eb2e8f9f7 55 (MXC_F_CLKMAN_CLK_CTRL_ADC_GATE_N | (MXC_E_CLKMAN_ADC_SOURCE_SELECT_SYSTEM <<
<> 144:ef7eb2e8f9f7 56 MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT_POS)));
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58
<> 144:ef7eb2e8f9f7 59 // Setup the OPAMP in follower mode
<> 144:ef7eb2e8f9f7 60 switch(obj->index) {
<> 144:ef7eb2e8f9f7 61 case 0:
<> 144:ef7eb2e8f9f7 62 // Enable DAC clock
<> 144:ef7eb2e8f9f7 63 MXC_CLKMAN->clk_ctrl_14_dac0 = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
<> 144:ef7eb2e8f9f7 64
<> 144:ef7eb2e8f9f7 65 // Enable OPAMP
<> 144:ef7eb2e8f9f7 66 MXC_AFE->ctrl5 &= ~MXC_F_AFE_CTRL5_OP_CMP0;
<> 144:ef7eb2e8f9f7 67
<> 144:ef7eb2e8f9f7 68 // Set the positive and negative inputs
<> 144:ef7eb2e8f9f7 69 MXC_SET_FIELD(&MXC_AFE->ctrl4, (MXC_F_AFE_CTRL4_DAC_SEL_A |
<> 144:ef7eb2e8f9f7 70 MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP0 | MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP0),
<> 144:ef7eb2e8f9f7 71 ((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP0_POS) |
<> 144:ef7eb2e8f9f7 72 (0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP0_POS) |
<> 144:ef7eb2e8f9f7 73 (0x0 << MXC_F_AFE_CTRL4_DAC_SEL_A_POS)));
<> 144:ef7eb2e8f9f7 74
<> 144:ef7eb2e8f9f7 75 // Enable N and P channel inputs
<> 144:ef7eb2e8f9f7 76 MXC_AFE->ctrl3 |= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP0 |
<> 144:ef7eb2e8f9f7 77 MXC_F_AFE_CTRL3_EN_NCH_OPAMP0);
<> 144:ef7eb2e8f9f7 78 break;
<> 144:ef7eb2e8f9f7 79 case 1:
<> 144:ef7eb2e8f9f7 80 // Enable DAC clock
<> 144:ef7eb2e8f9f7 81 MXC_CLKMAN->clk_ctrl_15_dac1 = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
<> 144:ef7eb2e8f9f7 82
<> 144:ef7eb2e8f9f7 83 // Enable OPAMP
<> 144:ef7eb2e8f9f7 84 MXC_AFE->ctrl5 &= ~MXC_F_AFE_CTRL5_OP_CMP1;
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 // Set the positive and negative inputs
<> 144:ef7eb2e8f9f7 87 MXC_SET_FIELD(&MXC_AFE->ctrl4, (MXC_F_AFE_CTRL4_DAC_SEL_B |
<> 144:ef7eb2e8f9f7 88 MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP1 | MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP1),
<> 144:ef7eb2e8f9f7 89 ((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP1_POS) |
<> 144:ef7eb2e8f9f7 90 (0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP1_POS) |
<> 144:ef7eb2e8f9f7 91 (0x1 << MXC_F_AFE_CTRL4_DAC_SEL_B_POS)));
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 // Enable N and P channel inputs
<> 144:ef7eb2e8f9f7 94 MXC_AFE->ctrl3 |= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP1 |
<> 144:ef7eb2e8f9f7 95 MXC_F_AFE_CTRL3_EN_NCH_OPAMP1);
<> 144:ef7eb2e8f9f7 96
<> 144:ef7eb2e8f9f7 97 break;
<> 144:ef7eb2e8f9f7 98 case 2:
<> 144:ef7eb2e8f9f7 99 // Enable DAC clock
<> 144:ef7eb2e8f9f7 100 MXC_CLKMAN->clk_ctrl_16_dac2 = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
<> 144:ef7eb2e8f9f7 101
<> 144:ef7eb2e8f9f7 102 // Enable OPAMP
<> 144:ef7eb2e8f9f7 103 MXC_AFE->ctrl5 &= ~MXC_F_AFE_CTRL5_OP_CMP2;
<> 144:ef7eb2e8f9f7 104
<> 144:ef7eb2e8f9f7 105 // Set the positive and negative inputs
<> 144:ef7eb2e8f9f7 106 MXC_SET_FIELD(&MXC_AFE->ctrl4, (MXC_F_AFE_CTRL4_DAC_SEL_C |
<> 144:ef7eb2e8f9f7 107 MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP2 | MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP2),
<> 144:ef7eb2e8f9f7 108 ((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP2_POS) |
<> 144:ef7eb2e8f9f7 109 (0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP2_POS) |
<> 144:ef7eb2e8f9f7 110 (0x2 << MXC_F_AFE_CTRL4_DAC_SEL_C_POS)));
<> 144:ef7eb2e8f9f7 111
<> 144:ef7eb2e8f9f7 112 // Enable N and P channel inputs
<> 144:ef7eb2e8f9f7 113 MXC_AFE->ctrl3 |= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP2 |
<> 144:ef7eb2e8f9f7 114 MXC_F_AFE_CTRL3_EN_NCH_OPAMP2);
<> 144:ef7eb2e8f9f7 115 break;
<> 144:ef7eb2e8f9f7 116 case 3:
<> 144:ef7eb2e8f9f7 117 // Enable DAC clock
<> 144:ef7eb2e8f9f7 118 MXC_CLKMAN->clk_ctrl_17_dac3 = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
<> 144:ef7eb2e8f9f7 119
<> 144:ef7eb2e8f9f7 120 // Enable OPAMP
<> 144:ef7eb2e8f9f7 121 MXC_AFE->ctrl5 &= ~MXC_F_AFE_CTRL5_OP_CMP3;
<> 144:ef7eb2e8f9f7 122
<> 144:ef7eb2e8f9f7 123 // Set the positive and negative inputs
<> 144:ef7eb2e8f9f7 124 MXC_SET_FIELD(&MXC_AFE->ctrl4, (MXC_F_AFE_CTRL4_DAC_SEL_D |
<> 144:ef7eb2e8f9f7 125 MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP3 | MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP3),
<> 144:ef7eb2e8f9f7 126 ((0x1 << MXC_F_AFE_CTRL4_P_IN_SEL_OPAMP3_POS) |
<> 144:ef7eb2e8f9f7 127 (0x1 << MXC_F_AFE_CTRL4_N_IN_SEL_OPAMP3_POS) |
<> 144:ef7eb2e8f9f7 128 (0x3 << MXC_F_AFE_CTRL4_DAC_SEL_D_POS)));
<> 144:ef7eb2e8f9f7 129
<> 144:ef7eb2e8f9f7 130 // Enable N and P channel inputs
<> 144:ef7eb2e8f9f7 131 MXC_AFE->ctrl3 |= (MXC_F_AFE_CTRL3_EN_PCH_OPAMP3 |
<> 144:ef7eb2e8f9f7 132 MXC_F_AFE_CTRL3_EN_NCH_OPAMP3);
<> 144:ef7eb2e8f9f7 133 break;
<> 144:ef7eb2e8f9f7 134 }
<> 144:ef7eb2e8f9f7 135
<> 144:ef7eb2e8f9f7 136 // Enable AFE power
<> 144:ef7eb2e8f9f7 137 MXC_PWRMAN->pwr_rst_ctrl |= MXC_F_PWRMAN_PWR_RST_CTRL_AFE_POWERED;
<> 144:ef7eb2e8f9f7 138
<> 144:ef7eb2e8f9f7 139 // Setup internal voltage references
<> 144:ef7eb2e8f9f7 140 MXC_SET_FIELD(&MXC_AFE->ctrl1, (MXC_F_AFE_CTRL1_REF_DAC_VOLT_SEL | MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL),
<> 144:ef7eb2e8f9f7 141 (MXC_F_AFE_CTRL1_REF_ADC_POWERUP | MXC_F_AFE_CTRL1_REF_BLK_POWERUP |
<> 144:ef7eb2e8f9f7 142 (MXC_E_AFE_REF_VOLT_SEL_1500 << MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL_POS)));
<> 144:ef7eb2e8f9f7 143
<> 144:ef7eb2e8f9f7 144 // Disable interpolation
<> 144:ef7eb2e8f9f7 145 obj->dac->ctrl0 &= ~MXC_F_DAC_CTRL0_INTERP_MODE;
<> 144:ef7eb2e8f9f7 146 }
<> 144:ef7eb2e8f9f7 147
<> 144:ef7eb2e8f9f7 148 //******************************************************************************
<> 144:ef7eb2e8f9f7 149 void analogout_write(dac_t *obj, float value)
<> 144:ef7eb2e8f9f7 150 {
<> 144:ef7eb2e8f9f7 151 analogout_write_u16(obj, (uint16_t)((value/1.0) * 0xFFFF));
<> 144:ef7eb2e8f9f7 152 }
<> 144:ef7eb2e8f9f7 153
<> 144:ef7eb2e8f9f7 154 //******************************************************************************
<> 144:ef7eb2e8f9f7 155 void analogout_write_u16(dac_t *obj, uint16_t value)
<> 144:ef7eb2e8f9f7 156 {
<> 144:ef7eb2e8f9f7 157 // Enable the OPAMP
<> 144:ef7eb2e8f9f7 158 // Setup the OPAMP in follower mode
<> 144:ef7eb2e8f9f7 159 switch(obj->index) {
<> 144:ef7eb2e8f9f7 160 case 0:
<> 144:ef7eb2e8f9f7 161 MXC_AFE->ctrl3 |= MXC_F_AFE_CTRL3_POWERUP_OPAMP0;
<> 144:ef7eb2e8f9f7 162 break;
<> 144:ef7eb2e8f9f7 163 case 1:
<> 144:ef7eb2e8f9f7 164 MXC_AFE->ctrl3 |= MXC_F_AFE_CTRL3_POWERUP_OPAMP1;
<> 144:ef7eb2e8f9f7 165 break;
<> 144:ef7eb2e8f9f7 166 case 2:
<> 144:ef7eb2e8f9f7 167 MXC_AFE->ctrl3 |= MXC_F_AFE_CTRL3_POWERUP_OPAMP2;
<> 144:ef7eb2e8f9f7 168 break;
<> 144:ef7eb2e8f9f7 169 case 3:
<> 144:ef7eb2e8f9f7 170 MXC_AFE->ctrl3 |= MXC_F_AFE_CTRL3_POWERUP_OPAMP3;
<> 144:ef7eb2e8f9f7 171 break;
<> 144:ef7eb2e8f9f7 172 }
<> 144:ef7eb2e8f9f7 173
<> 144:ef7eb2e8f9f7 174 // Output 1 sample with minimal delay
<> 144:ef7eb2e8f9f7 175 obj->dac->rate |= 0x1;
<> 144:ef7eb2e8f9f7 176
<> 144:ef7eb2e8f9f7 177 // Set the start mode to output once data is in the FIFO
<> 144:ef7eb2e8f9f7 178 obj->dac->ctrl0 &= ~(MXC_F_DAC_CTRL0_START_MODE | MXC_F_DAC_CTRL0_OP_MODE);
<> 144:ef7eb2e8f9f7 179
<> 144:ef7eb2e8f9f7 180 // Enable the DAC
<> 144:ef7eb2e8f9f7 181 obj->dac->ctrl0 |= (MXC_F_DAC_CTRL0_POWER_MODE_2 |
<> 144:ef7eb2e8f9f7 182 MXC_F_DAC_CTRL0_POWER_MODE_1_0 | MXC_F_DAC_CTRL0_POWER_ON |
<> 144:ef7eb2e8f9f7 183 MXC_F_DAC_CTRL0_CLOCK_GATE_EN | MXC_F_DAC_CTRL0_CPU_START);
<> 144:ef7eb2e8f9f7 184
<> 144:ef7eb2e8f9f7 185 if(obj->index < 2) {
<> 144:ef7eb2e8f9f7 186 obj->out = (value);
<> 144:ef7eb2e8f9f7 187 obj->dac_fifo->output_16 = (obj->out);
<> 144:ef7eb2e8f9f7 188
<> 144:ef7eb2e8f9f7 189 } else {
<> 144:ef7eb2e8f9f7 190 // Convert 16 bits to 8 bits
<> 144:ef7eb2e8f9f7 191 obj->out = (value >> 8);
<> 144:ef7eb2e8f9f7 192 obj->dac_fifo->output_8 = (obj->out);
<> 144:ef7eb2e8f9f7 193 }
<> 144:ef7eb2e8f9f7 194 }
<> 144:ef7eb2e8f9f7 195
<> 144:ef7eb2e8f9f7 196 //******************************************************************************
<> 144:ef7eb2e8f9f7 197 float analogout_read(dac_t *obj)
<> 144:ef7eb2e8f9f7 198 {
<> 144:ef7eb2e8f9f7 199 return (((float)analogout_read_u16(obj) / (float)0xFFFF) * 1.5);
<> 144:ef7eb2e8f9f7 200 }
<> 144:ef7eb2e8f9f7 201
<> 144:ef7eb2e8f9f7 202 //******************************************************************************
<> 144:ef7eb2e8f9f7 203 uint16_t analogout_read_u16(dac_t *obj)
<> 144:ef7eb2e8f9f7 204 {
<> 144:ef7eb2e8f9f7 205 if(obj->index < 2) {
<> 144:ef7eb2e8f9f7 206 // Convert 12 bits to 16 bits
<> 144:ef7eb2e8f9f7 207 return (obj->out << 4);
<> 144:ef7eb2e8f9f7 208 } else {
<> 144:ef7eb2e8f9f7 209 // Convert 8 bits to 16 bits
<> 144:ef7eb2e8f9f7 210 return (obj->out << 8);
<> 144:ef7eb2e8f9f7 211 }
<> 144:ef7eb2e8f9f7 212 }