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_MAX32620/analogin_api.c@144:ef7eb2e8f9f7, 2016-09-02 (annotated)

Committer:
<>
Date:
Fri Sep 02 15:07:44 2016 +0100
Revision:
144:ef7eb2e8f9f7
This updates the lib to the mbed lib v125

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /*******************************************************************************
<> 144:ef7eb2e8f9f7 2 * Copyright (C) 2016 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 "analogin_api.h"
<> 144:ef7eb2e8f9f7 36 #include "clkman_regs.h"
<> 144:ef7eb2e8f9f7 37 #include "pwrman_regs.h"
<> 144:ef7eb2e8f9f7 38 #include "trim_regs.h"
<> 144:ef7eb2e8f9f7 39 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 40
<> 144:ef7eb2e8f9f7 41 #define PGA_TRK_CNT 0x1F
<> 144:ef7eb2e8f9f7 42 #define ADC_ACT_CNT 0x1
<> 144:ef7eb2e8f9f7 43 #define ADC_PGA_CNT 0x1
<> 144:ef7eb2e8f9f7 44 #define ADC_ACQ_CNT 0x1
<> 144:ef7eb2e8f9f7 45 #define ADC_SLP_CNT 0x1
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 #define ADC_FULL_SCALE 0x3FF
<> 144:ef7eb2e8f9f7 48 #define ADC_EXTERNAL_LAST_INPUT 3
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 // Only allow initialization once
<> 144:ef7eb2e8f9f7 51 static int initialized = 0;
<> 144:ef7eb2e8f9f7 52
<> 144:ef7eb2e8f9f7 53 //******************************************************************************
<> 144:ef7eb2e8f9f7 54 void analogin_init(analogin_t *obj, PinName pin)
<> 144:ef7eb2e8f9f7 55 {
<> 144:ef7eb2e8f9f7 56 // Make sure pin is an analog pin we can use for ADC
<> 144:ef7eb2e8f9f7 57 MBED_ASSERT((ADCName)pinmap_peripheral(pin, PinMap_ADC) != (ADCName)NC);
<> 144:ef7eb2e8f9f7 58
<> 144:ef7eb2e8f9f7 59 // Set the object pointer
<> 144:ef7eb2e8f9f7 60 obj->adc = MXC_ADC;
<> 144:ef7eb2e8f9f7 61 obj->adc_pin = pin;
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63 if (initialized == 0) {
<> 144:ef7eb2e8f9f7 64 // Enable AFE power
<> 144:ef7eb2e8f9f7 65 MXC_PWRMAN->pwr_rst_ctrl |= MXC_F_PWRMAN_PWR_RST_CTRL_AFE_POWERED;
<> 144:ef7eb2e8f9f7 66
<> 144:ef7eb2e8f9f7 67 // Enable the clock
<> 144:ef7eb2e8f9f7 68 MXC_CLKMAN->clk_ctrl |= MXC_F_CLKMAN_CLK_CTRL_ADC_CLOCK_ENABLE;
<> 144:ef7eb2e8f9f7 69
<> 144:ef7eb2e8f9f7 70 // Enable clock gate
<> 144:ef7eb2e8f9f7 71 MXC_CLKMAN->clk_gate_ctrl2 |= MXC_F_CLKMAN_CLK_GATE_CTRL2_ADC_CLK_GATER;
<> 144:ef7eb2e8f9f7 72
<> 144:ef7eb2e8f9f7 73 // Enable interface clock
<> 144:ef7eb2e8f9f7 74 obj->adc->ctrl |= MXC_F_ADC_CTRL_ADC_CLK_EN;
<> 144:ef7eb2e8f9f7 75
<> 144:ef7eb2e8f9f7 76 if ((MXC_TRIM->reg11_adc_trim0 == 0xFFFFFFFF) && (MXC_TRIM->reg12_adc_trim1 == 0xFFFFFFFF)) {
<> 144:ef7eb2e8f9f7 77 // Set default trim for untrimmed parts.
<> 144:ef7eb2e8f9f7 78 MXC_TRIM->reg11_adc_trim0 = 0x02000200;
<> 144:ef7eb2e8f9f7 79 MXC_TRIM->reg12_adc_trim1 = 0x02000200;
<> 144:ef7eb2e8f9f7 80 }
<> 144:ef7eb2e8f9f7 81
<> 144:ef7eb2e8f9f7 82 // Clear ADC ready interrupt (wite 1 to clr)
<> 144:ef7eb2e8f9f7 83 obj->adc->intr = (obj->adc->intr & 0xFFFF) | MXC_F_ADC_INTR_ADC_REF_READY_IF;
<> 144:ef7eb2e8f9f7 84
<> 144:ef7eb2e8f9f7 85 // Using internal reference of 1.20V
<> 144:ef7eb2e8f9f7 86
<> 144:ef7eb2e8f9f7 87 // Enable ADC power bypass the buffer
<> 144:ef7eb2e8f9f7 88 obj->adc->ctrl |= (MXC_F_ADC_CTRL_ADC_PU | MXC_F_ADC_CTRL_ADC_REFBUF_PU |
<> 144:ef7eb2e8f9f7 89 MXC_F_ADC_CTRL_ADC_CHGPUMP_PU | MXC_F_ADC_CTRL_BUF_BYPASS);
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 // Wait for ADC ready
<> 144:ef7eb2e8f9f7 92 while (!(obj->adc->intr & MXC_F_ADC_INTR_ADC_REF_READY_IF));
<> 144:ef7eb2e8f9f7 93
<> 144:ef7eb2e8f9f7 94 initialized = 1;
<> 144:ef7eb2e8f9f7 95 }
<> 144:ef7eb2e8f9f7 96 }
<> 144:ef7eb2e8f9f7 97
<> 144:ef7eb2e8f9f7 98 //******************************************************************************
<> 144:ef7eb2e8f9f7 99 float analogin_read(analogin_t *obj)
<> 144:ef7eb2e8f9f7 100 {
<> 144:ef7eb2e8f9f7 101 // Convert integer to float
<> 144:ef7eb2e8f9f7 102 return (((float)analogin_read_u16(obj)/(float)ADC_FULL_SCALE));
<> 144:ef7eb2e8f9f7 103 }
<> 144:ef7eb2e8f9f7 104
<> 144:ef7eb2e8f9f7 105 //******************************************************************************
<> 144:ef7eb2e8f9f7 106 uint16_t analogin_read_u16(analogin_t *obj)
<> 144:ef7eb2e8f9f7 107 {
<> 144:ef7eb2e8f9f7 108 // Set the pin to take readings from
<> 144:ef7eb2e8f9f7 109 uint32_t adc_input = PINNAME_TO_PIN(obj->adc_pin);
<> 144:ef7eb2e8f9f7 110
<> 144:ef7eb2e8f9f7 111 // Select the channel
<> 144:ef7eb2e8f9f7 112 obj->adc->ctrl &= ~MXC_F_ADC_CTRL_ADC_CHSEL;
<> 144:ef7eb2e8f9f7 113 obj->adc->ctrl |= (adc_input << MXC_F_ADC_CTRL_ADC_CHSEL_POS) & MXC_F_ADC_CTRL_ADC_CHSEL;
<> 144:ef7eb2e8f9f7 114
<> 144:ef7eb2e8f9f7 115 // We want unity gain, to get full 0-Vref range
<> 144:ef7eb2e8f9f7 116 // So, both ref and adc input scale should be enabled
<> 144:ef7eb2e8f9f7 117 obj->adc->ctrl |= MXC_F_ADC_CTRL_ADC_SCALE | MXC_F_ADC_CTRL_ADC_REFSCL;
<> 144:ef7eb2e8f9f7 118
<> 144:ef7eb2e8f9f7 119 // Not using internal buffer, disable anyway
<> 144:ef7eb2e8f9f7 120 obj->adc->ctrl &= ~MXC_F_ADC_CTRL_BUF_PU;
<> 144:ef7eb2e8f9f7 121 obj->adc->ctrl |= MXC_F_ADC_CTRL_BUF_BYPASS;
<> 144:ef7eb2e8f9f7 122
<> 144:ef7eb2e8f9f7 123 // Normal LSB justified data alignment
<> 144:ef7eb2e8f9f7 124
<> 144:ef7eb2e8f9f7 125 // Not using limits
<> 144:ef7eb2e8f9f7 126
<> 144:ef7eb2e8f9f7 127 // Clear ADC done flag (wite 1 to clr)
<> 144:ef7eb2e8f9f7 128 obj->adc->intr = (obj->adc->intr & 0xFFFF) | MXC_F_ADC_INTR_ADC_DONE_IF;
<> 144:ef7eb2e8f9f7 129
<> 144:ef7eb2e8f9f7 130 // Start the conversion
<> 144:ef7eb2e8f9f7 131 obj->adc->ctrl |= MXC_F_ADC_CTRL_CPU_ADC_START;
<> 144:ef7eb2e8f9f7 132
<> 144:ef7eb2e8f9f7 133 // Wait for ADC done
<> 144:ef7eb2e8f9f7 134 while (!(obj->adc->intr & MXC_F_ADC_INTR_ADC_DONE_IF));
<> 144:ef7eb2e8f9f7 135
<> 144:ef7eb2e8f9f7 136 // Get sample from the fifo
<> 144:ef7eb2e8f9f7 137 uint16_t sample = obj->adc->data;
<> 144:ef7eb2e8f9f7 138
<> 144:ef7eb2e8f9f7 139 // Check for overflow, hardware will report overflow as 0
<> 144:ef7eb2e8f9f7 140 if (obj->adc->status & MXC_F_ADC_STATUS_ADC_OVERFLOW) {
<> 144:ef7eb2e8f9f7 141 sample = (uint16_t)ADC_FULL_SCALE;
<> 144:ef7eb2e8f9f7 142 }
<> 144:ef7eb2e8f9f7 143
<> 144:ef7eb2e8f9f7 144 return sample;
<> 144:ef7eb2e8f9f7 145 }