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targets/hal/TARGET_Maxim/TARGET_MAX32610/analogin_api.c@636:b0d178e9fa10, 2016-07-07 (annotated)

Committer:
lzbpli
Date:
Thu Jul 07 06:48:59 2016 +0000
Revision:
636:b0d178e9fa10
Parent:
515:7467ef1f4ad8 
l053

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 507:d4fc7603a669 1 /*******************************************************************************
mbed_official 507:d4fc7603a669 2 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
mbed_official 507:d4fc7603a669 3 *
mbed_official 507:d4fc7603a669 4 * Permission is hereby granted, free of charge, to any person obtaining a
mbed_official 507:d4fc7603a669 5 * copy of this software and associated documentation files (the "Software"),
mbed_official 507:d4fc7603a669 6 * to deal in the Software without restriction, including without limitation
mbed_official 507:d4fc7603a669 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
mbed_official 507:d4fc7603a669 8 * and/or sell copies of the Software, and to permit persons to whom the
mbed_official 507:d4fc7603a669 9 * Software is furnished to do so, subject to the following conditions:
mbed_official 507:d4fc7603a669 10 *
mbed_official 507:d4fc7603a669 11 * The above copyright notice and this permission notice shall be included
mbed_official 507:d4fc7603a669 12 * in all copies or substantial portions of the Software.
mbed_official 507:d4fc7603a669 13 *
mbed_official 507:d4fc7603a669 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
mbed_official 507:d4fc7603a669 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
mbed_official 507:d4fc7603a669 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
mbed_official 507:d4fc7603a669 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
mbed_official 507:d4fc7603a669 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
mbed_official 507:d4fc7603a669 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
mbed_official 507:d4fc7603a669 20 * OTHER DEALINGS IN THE SOFTWARE.
mbed_official 507:d4fc7603a669 21 *
mbed_official 507:d4fc7603a669 22 * Except as contained in this notice, the name of Maxim Integrated
mbed_official 507:d4fc7603a669 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
mbed_official 507:d4fc7603a669 24 * Products, Inc. Branding Policy.
mbed_official 507:d4fc7603a669 25 *
mbed_official 507:d4fc7603a669 26 * The mere transfer of this software does not imply any licenses
mbed_official 507:d4fc7603a669 27 * of trade secrets, proprietary technology, copyrights, patents,
mbed_official 507:d4fc7603a669 28 * trademarks, maskwork rights, or any other form of intellectual
mbed_official 507:d4fc7603a669 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
mbed_official 507:d4fc7603a669 30 * ownership rights.
mbed_official 507:d4fc7603a669 31 *******************************************************************************
mbed_official 507:d4fc7603a669 32 */
mbed_official 507:d4fc7603a669 33
mbed_official 507:d4fc7603a669 34 #include "mbed_assert.h"
mbed_official 507:d4fc7603a669 35 #include "analogin_api.h"
mbed_official 507:d4fc7603a669 36 #include "clkman_regs.h"
mbed_official 507:d4fc7603a669 37 #include "pwrman_regs.h"
mbed_official 507:d4fc7603a669 38 #include "afe_regs.h"
mbed_official 507:d4fc7603a669 39 #include "PeripheralPins.h"
mbed_official 507:d4fc7603a669 40
mbed_official 515:7467ef1f4ad8 41 #define PGA_TRK_CNT 0x1F
mbed_official 507:d4fc7603a669 42 #define ADC_ACT_CNT 0x1
mbed_official 507:d4fc7603a669 43 #define ADC_PGA_CNT 0x1
mbed_official 507:d4fc7603a669 44 #define ADC_ACQ_CNT 0x1
mbed_official 515:7467ef1f4ad8 45 #define ADC_SLP_CNT 0x1
mbed_official 507:d4fc7603a669 46
mbed_official 507:d4fc7603a669 47 //******************************************************************************
mbed_official 507:d4fc7603a669 48 void analogin_init(analogin_t *obj, PinName pin)
mbed_official 507:d4fc7603a669 49 {
mbed_official 507:d4fc7603a669 50 // Make sure pin is an analog pin we can use for ADC
mbed_official 507:d4fc7603a669 51 MBED_ASSERT((ADCName)pinmap_peripheral(pin, PinMap_ADC) != (ADCName)NC);
mbed_official 507:d4fc7603a669 52
mbed_official 507:d4fc7603a669 53 // Set the object pointer
mbed_official 507:d4fc7603a669 54 obj->adc = MXC_ADC;
mbed_official 507:d4fc7603a669 55 obj->adccfg = MXC_ADCCFG;
mbed_official 507:d4fc7603a669 56 obj->adc_fifo = MXC_ADC_FIFO;
mbed_official 507:d4fc7603a669 57 obj->adc_pin = pin;
mbed_official 507:d4fc7603a669 58
mbed_official 507:d4fc7603a669 59 // Set the ADC clock to the system clock frequency
mbed_official 507:d4fc7603a669 60 MXC_SET_FIELD(&MXC_CLKMAN->clk_ctrl, MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT,
mbed_official 507:d4fc7603a669 61 (MXC_F_CLKMAN_CLK_CTRL_ADC_GATE_N | (MXC_E_CLKMAN_ADC_SOURCE_SELECT_SYSTEM <<
mbed_official 507:d4fc7603a669 62 MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT_POS)));
mbed_official 507:d4fc7603a669 63
mbed_official 507:d4fc7603a669 64 // Enable AFE power
mbed_official 507:d4fc7603a669 65 MXC_PWRMAN->pwr_rst_ctrl |= MXC_F_PWRMAN_PWR_RST_CTRL_AFE_POWERED;
mbed_official 507:d4fc7603a669 66
mbed_official 507:d4fc7603a669 67 // Setup and hold window
mbed_official 507:d4fc7603a669 68 MXC_SET_FIELD(&obj->adc->tg_ctrl0, MXC_F_ADC_TG_CTRL0_PGA_TRK_CNT, PGA_TRK_CNT);
mbed_official 507:d4fc7603a669 69
mbed_official 507:d4fc7603a669 70 // Setup sampling count and timing
mbed_official 507:d4fc7603a669 71 MXC_SET_FIELD(&obj->adc->tg_ctrl1, (MXC_F_ADC_TG_CTRL1_PGA_ACQ_CNT |
mbed_official 507:d4fc7603a669 72 MXC_F_ADC_TG_CTRL1_ADC_ACQ_CNT | MXC_F_ADC_TG_CTRL1_ADC_SLP_CNT),
mbed_official 507:d4fc7603a669 73 ((ADC_PGA_CNT << MXC_F_ADC_TG_CTRL1_PGA_ACQ_CNT_POS) |
mbed_official 507:d4fc7603a669 74 (ADC_ACQ_CNT << MXC_F_ADC_TG_CTRL1_ADC_ACQ_CNT_POS) |
mbed_official 507:d4fc7603a669 75 (ADC_SLP_CNT << MXC_F_ADC_TG_CTRL1_ADC_SLP_CNT_POS) |
mbed_official 507:d4fc7603a669 76 (MXC_F_ADC_TG_CTRL1_ADC_BRST_CNT)));
mbed_official 507:d4fc7603a669 77 }
mbed_official 507:d4fc7603a669 78
mbed_official 507:d4fc7603a669 79 //******************************************************************************
mbed_official 507:d4fc7603a669 80 float analogin_read(analogin_t *obj)
mbed_official 507:d4fc7603a669 81 {
mbed_official 507:d4fc7603a669 82 // Convert integer to float
mbed_official 507:d4fc7603a669 83 return (((float)analogin_read_u16(obj)/(float)0xFFFF));
mbed_official 507:d4fc7603a669 84 }
mbed_official 507:d4fc7603a669 85
mbed_official 507:d4fc7603a669 86 //******************************************************************************
mbed_official 507:d4fc7603a669 87 uint16_t analogin_read_u16(analogin_t *obj)
mbed_official 507:d4fc7603a669 88 {
mbed_official 507:d4fc7603a669 89 // Set the pin to take readings from
mbed_official 507:d4fc7603a669 90 unsigned mux_pos;
mbed_official 507:d4fc7603a669 91 unsigned diff = 0;
mbed_official 507:d4fc7603a669 92 if(obj->adc_pin >> PORT_SHIFT == 0xB) {
mbed_official 507:d4fc7603a669 93 mux_pos = (obj->adc_pin & 0xF) + 8;
mbed_official 507:d4fc7603a669 94 } else {
mbed_official 507:d4fc7603a669 95 mux_pos = (obj->adc_pin & 0xF);
mbed_official 507:d4fc7603a669 96 }
mbed_official 507:d4fc7603a669 97
mbed_official 507:d4fc7603a669 98 if(obj->adc_pin >> PORT_SHIFT == 0xC) {
mbed_official 507:d4fc7603a669 99 diff = 1;
mbed_official 507:d4fc7603a669 100 mux_pos = (obj->adc_pin & 0xF) + 8;
mbed_official 507:d4fc7603a669 101 }
mbed_official 507:d4fc7603a669 102
mbed_official 515:7467ef1f4ad8 103 // Reset the ADC
mbed_official 515:7467ef1f4ad8 104 obj->adc->ctrl0 |= MXC_F_ADC_CTRL0_CPU_ADC_RST;
mbed_official 515:7467ef1f4ad8 105
mbed_official 515:7467ef1f4ad8 106 // Enable the ADC
mbed_official 515:7467ef1f4ad8 107 obj->adc->ctrl0 |= MXC_F_ADC_CTRL0_CPU_ADC_EN;
mbed_official 515:7467ef1f4ad8 108
mbed_official 507:d4fc7603a669 109 // Setup the ADC clock
mbed_official 507:d4fc7603a669 110 MXC_SET_FIELD(&obj->adc->ctrl0, (MXC_F_ADC_CTRL0_ADC_MODE | MXC_F_ADC_CTRL0_AVG_MODE |
mbed_official 507:d4fc7603a669 111 MXC_F_ADC_CTRL0_ADC_CLK_MODE | MXC_F_ADC_CTRL0_ADC_BI_POL),
mbed_official 507:d4fc7603a669 112 ((MXC_E_ADC_MODE_SMPLCNT_FULL_RATE << MXC_F_ADC_CTRL0_ADC_MODE_POS) |
mbed_official 507:d4fc7603a669 113 (MXC_E_ADC_AVG_MODE_FILTER_OUTPUT << MXC_F_ADC_CTRL0_AVG_MODE_POS) |
mbed_official 507:d4fc7603a669 114 (0x2 << MXC_F_ADC_CTRL0_ADC_CLK_MODE_POS) |
mbed_official 507:d4fc7603a669 115 MXC_F_ADC_CTRL0_ADC_CLK_EN));
mbed_official 507:d4fc7603a669 116
mbed_official 507:d4fc7603a669 117 // Setup the input multiplexor
mbed_official 507:d4fc7603a669 118 MXC_SET_FIELD(&obj->adc->pga_ctrl, (MXC_F_ADC_PGA_CTRL_MUX_CH_SEL |
mbed_official 507:d4fc7603a669 119 MXC_F_ADC_PGA_CTRL_MUX_DIFF | MXC_F_ADC_PGA_CTRL_PGA_GAIN),
mbed_official 507:d4fc7603a669 120 ((mux_pos << MXC_F_ADC_PGA_CTRL_MUX_CH_SEL_POS) |
mbed_official 507:d4fc7603a669 121 (diff << MXC_F_ADC_PGA_CTRL_MUX_DIFF_POS)));
mbed_official 507:d4fc7603a669 122
mbed_official 507:d4fc7603a669 123 // Setup voltage reference
mbed_official 507:d4fc7603a669 124 MXC_SET_FIELD(&MXC_AFE->ctrl1, MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL,
mbed_official 507:d4fc7603a669 125 (MXC_F_AFE_CTRL1_REF_ADC_POWERUP | MXC_F_AFE_CTRL1_REF_BLK_POWERUP |
mbed_official 507:d4fc7603a669 126 (MXC_E_AFE_REF_VOLT_SEL_1500 << MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL_POS)));
mbed_official 507:d4fc7603a669 127
mbed_official 507:d4fc7603a669 128 // Clear the done bit
mbed_official 507:d4fc7603a669 129 obj->adc->intr = MXC_F_ADC_INTR_DONE_IF;
mbed_official 507:d4fc7603a669 130
mbed_official 507:d4fc7603a669 131 // Take one sample
mbed_official 507:d4fc7603a669 132 obj->adc->tg_ctrl0 |= (1 << MXC_F_ADC_TG_CTRL0_ADC_SMPL_CNT_POS);
mbed_official 507:d4fc7603a669 133
mbed_official 507:d4fc7603a669 134 // Set the start bit to take the sample
mbed_official 507:d4fc7603a669 135 obj->adc->ctrl0 |= MXC_F_ADC_CTRL0_CPU_ADC_START;
mbed_official 507:d4fc7603a669 136
mbed_official 507:d4fc7603a669 137 // Wait for the conversion to complete
mbed_official 507:d4fc7603a669 138 while(!(obj->adc->intr & MXC_F_ADC_INTR_DONE_IF)) {}
mbed_official 507:d4fc7603a669 139
mbed_official 507:d4fc7603a669 140 // Get sample from the fifo
mbed_official 507:d4fc7603a669 141 uint16_t sample = (uint16_t)(obj->adc->out & 0xFFFF);
mbed_official 507:d4fc7603a669 142
mbed_official 507:d4fc7603a669 143 // Disable ADC
mbed_official 507:d4fc7603a669 144 obj->adc->ctrl0 &= ~MXC_F_ADC_CTRL0_CPU_ADC_EN;
mbed_official 507:d4fc7603a669 145
mbed_official 507:d4fc7603a669 146 return (sample - 1);
mbed_official 507:d4fc7603a669 147 }