ON Semiconductor / mbed-os

5.2.1 - Updated I2C files

Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

targets/TARGET_Maxim/TARGET_MAX32610/analogin_api.c@1:f30bdcd2b33b, 2017-02-27 (annotated)

Committer:
jacobjohnson
Date:
Mon Feb 27 17:45:05 2017 +0000
Revision:
1:f30bdcd2b33b
Parent:
0:098463de4c5d 
changed the inputscale from 1 to 7 in analogin_api.c.  This will need to be changed later, and accessed from the main level, but for now this allows the  adc to read a value from 0 to 3.7V, instead of just up to 1V.;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /*******************************************************************************
group-onsemi 0:098463de4c5d 2 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
group-onsemi 0:098463de4c5d 3 *
group-onsemi 0:098463de4c5d 4 * Permission is hereby granted, free of charge, to any person obtaining a
group-onsemi 0:098463de4c5d 5 * copy of this software and associated documentation files (the "Software"),
group-onsemi 0:098463de4c5d 6 * to deal in the Software without restriction, including without limitation
group-onsemi 0:098463de4c5d 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
group-onsemi 0:098463de4c5d 8 * and/or sell copies of the Software, and to permit persons to whom the
group-onsemi 0:098463de4c5d 9 * Software is furnished to do so, subject to the following conditions:
group-onsemi 0:098463de4c5d 10 *
group-onsemi 0:098463de4c5d 11 * The above copyright notice and this permission notice shall be included
group-onsemi 0:098463de4c5d 12 * in all copies or substantial portions of the Software.
group-onsemi 0:098463de4c5d 13 *
group-onsemi 0:098463de4c5d 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
group-onsemi 0:098463de4c5d 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
group-onsemi 0:098463de4c5d 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
group-onsemi 0:098463de4c5d 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
group-onsemi 0:098463de4c5d 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
group-onsemi 0:098463de4c5d 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
group-onsemi 0:098463de4c5d 20 * OTHER DEALINGS IN THE SOFTWARE.
group-onsemi 0:098463de4c5d 21 *
group-onsemi 0:098463de4c5d 22 * Except as contained in this notice, the name of Maxim Integrated
group-onsemi 0:098463de4c5d 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
group-onsemi 0:098463de4c5d 24 * Products, Inc. Branding Policy.
group-onsemi 0:098463de4c5d 25 *
group-onsemi 0:098463de4c5d 26 * The mere transfer of this software does not imply any licenses
group-onsemi 0:098463de4c5d 27 * of trade secrets, proprietary technology, copyrights, patents,
group-onsemi 0:098463de4c5d 28 * trademarks, maskwork rights, or any other form of intellectual
group-onsemi 0:098463de4c5d 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
group-onsemi 0:098463de4c5d 30 * ownership rights.
group-onsemi 0:098463de4c5d 31 *******************************************************************************
group-onsemi 0:098463de4c5d 32 */
group-onsemi 0:098463de4c5d 33
group-onsemi 0:098463de4c5d 34 #include "mbed_assert.h"
group-onsemi 0:098463de4c5d 35 #include "analogin_api.h"
group-onsemi 0:098463de4c5d 36 #include "clkman_regs.h"
group-onsemi 0:098463de4c5d 37 #include "pwrman_regs.h"
group-onsemi 0:098463de4c5d 38 #include "afe_regs.h"
group-onsemi 0:098463de4c5d 39 #include "PeripheralPins.h"
group-onsemi 0:098463de4c5d 40
group-onsemi 0:098463de4c5d 41 #define PGA_TRK_CNT 0x1F
group-onsemi 0:098463de4c5d 42 #define ADC_ACT_CNT 0x1
group-onsemi 0:098463de4c5d 43 #define ADC_PGA_CNT 0x1
group-onsemi 0:098463de4c5d 44 #define ADC_ACQ_CNT 0x1
group-onsemi 0:098463de4c5d 45 #define ADC_SLP_CNT 0x1
group-onsemi 0:098463de4c5d 46
group-onsemi 0:098463de4c5d 47 //******************************************************************************
group-onsemi 0:098463de4c5d 48 void analogin_init(analogin_t *obj, PinName pin)
group-onsemi 0:098463de4c5d 49 {
group-onsemi 0:098463de4c5d 50 // Make sure pin is an analog pin we can use for ADC
group-onsemi 0:098463de4c5d 51 MBED_ASSERT((ADCName)pinmap_peripheral(pin, PinMap_ADC) != (ADCName)NC);
group-onsemi 0:098463de4c5d 52
group-onsemi 0:098463de4c5d 53 // Set the object pointer
group-onsemi 0:098463de4c5d 54 obj->adc = MXC_ADC;
group-onsemi 0:098463de4c5d 55 obj->adccfg = MXC_ADCCFG;
group-onsemi 0:098463de4c5d 56 obj->adc_fifo = MXC_ADC_FIFO;
group-onsemi 0:098463de4c5d 57 obj->adc_pin = pin;
group-onsemi 0:098463de4c5d 58
group-onsemi 0:098463de4c5d 59 // Set the ADC clock to the system clock frequency
group-onsemi 0:098463de4c5d 60 MXC_SET_FIELD(&MXC_CLKMAN->clk_ctrl, MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT,
group-onsemi 0:098463de4c5d 61 (MXC_F_CLKMAN_CLK_CTRL_ADC_GATE_N | (MXC_E_CLKMAN_ADC_SOURCE_SELECT_SYSTEM <<
group-onsemi 0:098463de4c5d 62 MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT_POS)));
group-onsemi 0:098463de4c5d 63
group-onsemi 0:098463de4c5d 64 // Enable AFE power
group-onsemi 0:098463de4c5d 65 MXC_PWRMAN->pwr_rst_ctrl |= MXC_F_PWRMAN_PWR_RST_CTRL_AFE_POWERED;
group-onsemi 0:098463de4c5d 66
group-onsemi 0:098463de4c5d 67 // Setup and hold window
group-onsemi 0:098463de4c5d 68 MXC_SET_FIELD(&obj->adc->tg_ctrl0, MXC_F_ADC_TG_CTRL0_PGA_TRK_CNT, PGA_TRK_CNT);
group-onsemi 0:098463de4c5d 69
group-onsemi 0:098463de4c5d 70 // Setup sampling count and timing
group-onsemi 0:098463de4c5d 71 MXC_SET_FIELD(&obj->adc->tg_ctrl1, (MXC_F_ADC_TG_CTRL1_PGA_ACQ_CNT |
group-onsemi 0:098463de4c5d 72 MXC_F_ADC_TG_CTRL1_ADC_ACQ_CNT | MXC_F_ADC_TG_CTRL1_ADC_SLP_CNT),
group-onsemi 0:098463de4c5d 73 ((ADC_PGA_CNT << MXC_F_ADC_TG_CTRL1_PGA_ACQ_CNT_POS) |
group-onsemi 0:098463de4c5d 74 (ADC_ACQ_CNT << MXC_F_ADC_TG_CTRL1_ADC_ACQ_CNT_POS) |
group-onsemi 0:098463de4c5d 75 (ADC_SLP_CNT << MXC_F_ADC_TG_CTRL1_ADC_SLP_CNT_POS) |
group-onsemi 0:098463de4c5d 76 (MXC_F_ADC_TG_CTRL1_ADC_BRST_CNT)));
group-onsemi 0:098463de4c5d 77 }
group-onsemi 0:098463de4c5d 78
group-onsemi 0:098463de4c5d 79 //******************************************************************************
group-onsemi 0:098463de4c5d 80 float analogin_read(analogin_t *obj)
group-onsemi 0:098463de4c5d 81 {
group-onsemi 0:098463de4c5d 82 // Convert integer to float
group-onsemi 0:098463de4c5d 83 return (((float)analogin_read_u16(obj)/(float)0xFFFF));
group-onsemi 0:098463de4c5d 84 }
group-onsemi 0:098463de4c5d 85
group-onsemi 0:098463de4c5d 86 //******************************************************************************
group-onsemi 0:098463de4c5d 87 uint16_t analogin_read_u16(analogin_t *obj)
group-onsemi 0:098463de4c5d 88 {
group-onsemi 0:098463de4c5d 89 // Set the pin to take readings from
group-onsemi 0:098463de4c5d 90 unsigned mux_pos;
group-onsemi 0:098463de4c5d 91 unsigned diff = 0;
group-onsemi 0:098463de4c5d 92 if(obj->adc_pin >> PORT_SHIFT == 0xB) {
group-onsemi 0:098463de4c5d 93 mux_pos = (obj->adc_pin & 0xF) + 8;
group-onsemi 0:098463de4c5d 94 } else {
group-onsemi 0:098463de4c5d 95 mux_pos = (obj->adc_pin & 0xF);
group-onsemi 0:098463de4c5d 96 }
group-onsemi 0:098463de4c5d 97
group-onsemi 0:098463de4c5d 98 if(obj->adc_pin >> PORT_SHIFT == 0xC) {
group-onsemi 0:098463de4c5d 99 diff = 1;
group-onsemi 0:098463de4c5d 100 mux_pos = (obj->adc_pin & 0xF) + 8;
group-onsemi 0:098463de4c5d 101 }
group-onsemi 0:098463de4c5d 102
group-onsemi 0:098463de4c5d 103 // Reset the ADC
group-onsemi 0:098463de4c5d 104 obj->adc->ctrl0 |= MXC_F_ADC_CTRL0_CPU_ADC_RST;
group-onsemi 0:098463de4c5d 105
group-onsemi 0:098463de4c5d 106 // Enable the ADC
group-onsemi 0:098463de4c5d 107 obj->adc->ctrl0 |= MXC_F_ADC_CTRL0_CPU_ADC_EN;
group-onsemi 0:098463de4c5d 108
group-onsemi 0:098463de4c5d 109 // Setup the ADC clock
group-onsemi 0:098463de4c5d 110 MXC_SET_FIELD(&obj->adc->ctrl0, (MXC_F_ADC_CTRL0_ADC_MODE | MXC_F_ADC_CTRL0_AVG_MODE |
group-onsemi 0:098463de4c5d 111 MXC_F_ADC_CTRL0_ADC_CLK_MODE | MXC_F_ADC_CTRL0_ADC_BI_POL),
group-onsemi 0:098463de4c5d 112 ((MXC_E_ADC_MODE_SMPLCNT_FULL_RATE << MXC_F_ADC_CTRL0_ADC_MODE_POS) |
group-onsemi 0:098463de4c5d 113 (MXC_E_ADC_AVG_MODE_FILTER_OUTPUT << MXC_F_ADC_CTRL0_AVG_MODE_POS) |
group-onsemi 0:098463de4c5d 114 (0x2 << MXC_F_ADC_CTRL0_ADC_CLK_MODE_POS) |
group-onsemi 0:098463de4c5d 115 MXC_F_ADC_CTRL0_ADC_CLK_EN));
group-onsemi 0:098463de4c5d 116
group-onsemi 0:098463de4c5d 117 // Setup the input multiplexor
group-onsemi 0:098463de4c5d 118 MXC_SET_FIELD(&obj->adc->pga_ctrl, (MXC_F_ADC_PGA_CTRL_MUX_CH_SEL |
group-onsemi 0:098463de4c5d 119 MXC_F_ADC_PGA_CTRL_MUX_DIFF | MXC_F_ADC_PGA_CTRL_PGA_GAIN),
group-onsemi 0:098463de4c5d 120 ((mux_pos << MXC_F_ADC_PGA_CTRL_MUX_CH_SEL_POS) |
group-onsemi 0:098463de4c5d 121 (diff << MXC_F_ADC_PGA_CTRL_MUX_DIFF_POS)));
group-onsemi 0:098463de4c5d 122
group-onsemi 0:098463de4c5d 123 // Setup voltage reference
group-onsemi 0:098463de4c5d 124 MXC_SET_FIELD(&MXC_AFE->ctrl1, MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL,
group-onsemi 0:098463de4c5d 125 (MXC_F_AFE_CTRL1_REF_ADC_POWERUP | MXC_F_AFE_CTRL1_REF_BLK_POWERUP |
group-onsemi 0:098463de4c5d 126 (MXC_E_AFE_REF_VOLT_SEL_1500 << MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL_POS)));
group-onsemi 0:098463de4c5d 127
group-onsemi 0:098463de4c5d 128 // Clear the done bit
group-onsemi 0:098463de4c5d 129 obj->adc->intr = MXC_F_ADC_INTR_DONE_IF;
group-onsemi 0:098463de4c5d 130
group-onsemi 0:098463de4c5d 131 // Take one sample
group-onsemi 0:098463de4c5d 132 obj->adc->tg_ctrl0 |= (1 << MXC_F_ADC_TG_CTRL0_ADC_SMPL_CNT_POS);
group-onsemi 0:098463de4c5d 133
group-onsemi 0:098463de4c5d 134 // Set the start bit to take the sample
group-onsemi 0:098463de4c5d 135 obj->adc->ctrl0 |= MXC_F_ADC_CTRL0_CPU_ADC_START;
group-onsemi 0:098463de4c5d 136
group-onsemi 0:098463de4c5d 137 // Wait for the conversion to complete
group-onsemi 0:098463de4c5d 138 while(!(obj->adc->intr & MXC_F_ADC_INTR_DONE_IF)) {}
group-onsemi 0:098463de4c5d 139
group-onsemi 0:098463de4c5d 140 // Get sample from the fifo
group-onsemi 0:098463de4c5d 141 uint16_t sample = (uint16_t)(obj->adc->out & 0xFFFF);
group-onsemi 0:098463de4c5d 142
group-onsemi 0:098463de4c5d 143 // Disable ADC
group-onsemi 0:098463de4c5d 144 obj->adc->ctrl0 &= ~MXC_F_ADC_CTRL0_CPU_ADC_EN;
group-onsemi 0:098463de4c5d 145
group-onsemi 0:098463de4c5d 146 return (sample - 1);
group-onsemi 0:098463de4c5d 147 }