mbed library sources. Supersedes mbed-src.
Dependents: Hobbyking_Cheetah_Compact Hobbyking_Cheetah_Compact_DRV8323_14bit Hobbyking_Cheetah_Compact_DRV8323_V51_201907 HKC_MiniCheetah ... more
Fork of mbed-dev by
targets/TARGET_Maxim/TARGET_MAX32620/analogin_api.c@181:36facd806e4a, 2018-07-30 (annotated)
- Committer:
- benkatz
- Date:
- Mon Jul 30 20:31:44 2018 +0000
- Revision:
- 181:36facd806e4a
- Parent:
- 149:156823d33999
going on the robot. fixed a dumb bug in float_to_uint
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
<> | 149:156823d33999 | 1 | /******************************************************************************* |
<> | 149:156823d33999 | 2 | * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved. |
<> | 149:156823d33999 | 3 | * |
<> | 149:156823d33999 | 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
<> | 149:156823d33999 | 5 | * copy of this software and associated documentation files (the "Software"), |
<> | 149:156823d33999 | 6 | * to deal in the Software without restriction, including without limitation |
<> | 149:156823d33999 | 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
<> | 149:156823d33999 | 8 | * and/or sell copies of the Software, and to permit persons to whom the |
<> | 149:156823d33999 | 9 | * Software is furnished to do so, subject to the following conditions: |
<> | 149:156823d33999 | 10 | * |
<> | 149:156823d33999 | 11 | * The above copyright notice and this permission notice shall be included |
<> | 149:156823d33999 | 12 | * in all copies or substantial portions of the Software. |
<> | 149:156823d33999 | 13 | * |
<> | 149:156823d33999 | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
<> | 149:156823d33999 | 15 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
<> | 149:156823d33999 | 16 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
<> | 149:156823d33999 | 17 | * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES |
<> | 149:156823d33999 | 18 | * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
<> | 149:156823d33999 | 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
<> | 149:156823d33999 | 20 | * OTHER DEALINGS IN THE SOFTWARE. |
<> | 149:156823d33999 | 21 | * |
<> | 149:156823d33999 | 22 | * Except as contained in this notice, the name of Maxim Integrated |
<> | 149:156823d33999 | 23 | * Products, Inc. shall not be used except as stated in the Maxim Integrated |
<> | 149:156823d33999 | 24 | * Products, Inc. Branding Policy. |
<> | 149:156823d33999 | 25 | * |
<> | 149:156823d33999 | 26 | * The mere transfer of this software does not imply any licenses |
<> | 149:156823d33999 | 27 | * of trade secrets, proprietary technology, copyrights, patents, |
<> | 149:156823d33999 | 28 | * trademarks, maskwork rights, or any other form of intellectual |
<> | 149:156823d33999 | 29 | * property whatsoever. Maxim Integrated Products, Inc. retains all |
<> | 149:156823d33999 | 30 | * ownership rights. |
<> | 149:156823d33999 | 31 | ******************************************************************************* |
<> | 149:156823d33999 | 32 | */ |
<> | 149:156823d33999 | 33 | |
<> | 149:156823d33999 | 34 | #include "mbed_assert.h" |
<> | 149:156823d33999 | 35 | #include "analogin_api.h" |
<> | 149:156823d33999 | 36 | #include "clkman_regs.h" |
<> | 149:156823d33999 | 37 | #include "pwrman_regs.h" |
<> | 149:156823d33999 | 38 | #include "trim_regs.h" |
<> | 149:156823d33999 | 39 | #include "PeripheralPins.h" |
<> | 149:156823d33999 | 40 | |
<> | 149:156823d33999 | 41 | #define PGA_TRK_CNT 0x1F |
<> | 149:156823d33999 | 42 | #define ADC_ACT_CNT 0x1 |
<> | 149:156823d33999 | 43 | #define ADC_PGA_CNT 0x1 |
<> | 149:156823d33999 | 44 | #define ADC_ACQ_CNT 0x1 |
<> | 149:156823d33999 | 45 | #define ADC_SLP_CNT 0x1 |
<> | 149:156823d33999 | 46 | |
<> | 149:156823d33999 | 47 | #define ADC_FULL_SCALE 0x3FF |
<> | 149:156823d33999 | 48 | #define ADC_EXTERNAL_LAST_INPUT 3 |
<> | 149:156823d33999 | 49 | |
<> | 149:156823d33999 | 50 | // Only allow initialization once |
<> | 149:156823d33999 | 51 | static int initialized = 0; |
<> | 149:156823d33999 | 52 | |
<> | 149:156823d33999 | 53 | //****************************************************************************** |
<> | 149:156823d33999 | 54 | void analogin_init(analogin_t *obj, PinName pin) |
<> | 149:156823d33999 | 55 | { |
<> | 149:156823d33999 | 56 | // Make sure pin is an analog pin we can use for ADC |
<> | 149:156823d33999 | 57 | MBED_ASSERT((ADCName)pinmap_peripheral(pin, PinMap_ADC) != (ADCName)NC); |
<> | 149:156823d33999 | 58 | |
<> | 149:156823d33999 | 59 | // Set the object pointer |
<> | 149:156823d33999 | 60 | obj->adc = MXC_ADC; |
<> | 149:156823d33999 | 61 | obj->adc_pin = pin; |
<> | 149:156823d33999 | 62 | |
<> | 149:156823d33999 | 63 | if (initialized == 0) { |
<> | 149:156823d33999 | 64 | // Enable AFE power |
<> | 149:156823d33999 | 65 | MXC_PWRMAN->pwr_rst_ctrl |= MXC_F_PWRMAN_PWR_RST_CTRL_AFE_POWERED; |
<> | 149:156823d33999 | 66 | |
<> | 149:156823d33999 | 67 | // Enable the clock |
<> | 149:156823d33999 | 68 | MXC_CLKMAN->clk_ctrl |= MXC_F_CLKMAN_CLK_CTRL_ADC_CLOCK_ENABLE; |
<> | 149:156823d33999 | 69 | |
<> | 149:156823d33999 | 70 | // Enable clock gate |
<> | 149:156823d33999 | 71 | MXC_CLKMAN->clk_gate_ctrl2 |= MXC_F_CLKMAN_CLK_GATE_CTRL2_ADC_CLK_GATER; |
<> | 149:156823d33999 | 72 | |
<> | 149:156823d33999 | 73 | // Enable interface clock |
<> | 149:156823d33999 | 74 | obj->adc->ctrl |= MXC_F_ADC_CTRL_ADC_CLK_EN; |
<> | 149:156823d33999 | 75 | |
<> | 149:156823d33999 | 76 | if ((MXC_TRIM->reg11_adc_trim0 == 0xFFFFFFFF) && (MXC_TRIM->reg12_adc_trim1 == 0xFFFFFFFF)) { |
<> | 149:156823d33999 | 77 | // Set default trim for untrimmed parts. |
<> | 149:156823d33999 | 78 | MXC_TRIM->reg11_adc_trim0 = 0x02000200; |
<> | 149:156823d33999 | 79 | MXC_TRIM->reg12_adc_trim1 = 0x02000200; |
<> | 149:156823d33999 | 80 | } |
<> | 149:156823d33999 | 81 | |
<> | 149:156823d33999 | 82 | // Clear ADC ready interrupt (wite 1 to clr) |
<> | 149:156823d33999 | 83 | obj->adc->intr = (obj->adc->intr & 0xFFFF) | MXC_F_ADC_INTR_ADC_REF_READY_IF; |
<> | 149:156823d33999 | 84 | |
<> | 149:156823d33999 | 85 | // Using internal reference of 1.20V |
<> | 149:156823d33999 | 86 | |
<> | 149:156823d33999 | 87 | // Enable ADC power bypass the buffer |
<> | 149:156823d33999 | 88 | obj->adc->ctrl |= (MXC_F_ADC_CTRL_ADC_PU | MXC_F_ADC_CTRL_ADC_REFBUF_PU | |
<> | 149:156823d33999 | 89 | MXC_F_ADC_CTRL_ADC_CHGPUMP_PU | MXC_F_ADC_CTRL_BUF_BYPASS); |
<> | 149:156823d33999 | 90 | |
<> | 149:156823d33999 | 91 | // Wait for ADC ready |
<> | 149:156823d33999 | 92 | while (!(obj->adc->intr & MXC_F_ADC_INTR_ADC_REF_READY_IF)); |
<> | 149:156823d33999 | 93 | |
<> | 149:156823d33999 | 94 | initialized = 1; |
<> | 149:156823d33999 | 95 | } |
<> | 149:156823d33999 | 96 | } |
<> | 149:156823d33999 | 97 | |
<> | 149:156823d33999 | 98 | //****************************************************************************** |
<> | 149:156823d33999 | 99 | float analogin_read(analogin_t *obj) |
<> | 149:156823d33999 | 100 | { |
<> | 149:156823d33999 | 101 | // Convert integer to float |
<> | 149:156823d33999 | 102 | return (((float)analogin_read_u16(obj)/(float)ADC_FULL_SCALE)); |
<> | 149:156823d33999 | 103 | } |
<> | 149:156823d33999 | 104 | |
<> | 149:156823d33999 | 105 | //****************************************************************************** |
<> | 149:156823d33999 | 106 | uint16_t analogin_read_u16(analogin_t *obj) |
<> | 149:156823d33999 | 107 | { |
<> | 149:156823d33999 | 108 | // Set the pin to take readings from |
<> | 149:156823d33999 | 109 | uint32_t adc_input = PINNAME_TO_PIN(obj->adc_pin); |
<> | 149:156823d33999 | 110 | |
<> | 149:156823d33999 | 111 | // Select the channel |
<> | 149:156823d33999 | 112 | obj->adc->ctrl &= ~MXC_F_ADC_CTRL_ADC_CHSEL; |
<> | 149:156823d33999 | 113 | obj->adc->ctrl |= (adc_input << MXC_F_ADC_CTRL_ADC_CHSEL_POS) & MXC_F_ADC_CTRL_ADC_CHSEL; |
<> | 149:156823d33999 | 114 | |
<> | 149:156823d33999 | 115 | // We want unity gain, to get full 0-Vref range |
<> | 149:156823d33999 | 116 | // So, both ref and adc input scale should be enabled |
<> | 149:156823d33999 | 117 | obj->adc->ctrl |= MXC_F_ADC_CTRL_ADC_SCALE | MXC_F_ADC_CTRL_ADC_REFSCL; |
<> | 149:156823d33999 | 118 | |
<> | 149:156823d33999 | 119 | // Not using internal buffer, disable anyway |
<> | 149:156823d33999 | 120 | obj->adc->ctrl &= ~MXC_F_ADC_CTRL_BUF_PU; |
<> | 149:156823d33999 | 121 | obj->adc->ctrl |= MXC_F_ADC_CTRL_BUF_BYPASS; |
<> | 149:156823d33999 | 122 | |
<> | 149:156823d33999 | 123 | // Normal LSB justified data alignment |
<> | 149:156823d33999 | 124 | |
<> | 149:156823d33999 | 125 | // Not using limits |
<> | 149:156823d33999 | 126 | |
<> | 149:156823d33999 | 127 | // Clear ADC done flag (wite 1 to clr) |
<> | 149:156823d33999 | 128 | obj->adc->intr = (obj->adc->intr & 0xFFFF) | MXC_F_ADC_INTR_ADC_DONE_IF; |
<> | 149:156823d33999 | 129 | |
<> | 149:156823d33999 | 130 | // Start the conversion |
<> | 149:156823d33999 | 131 | obj->adc->ctrl |= MXC_F_ADC_CTRL_CPU_ADC_START; |
<> | 149:156823d33999 | 132 | |
<> | 149:156823d33999 | 133 | // Wait for ADC done |
<> | 149:156823d33999 | 134 | while (!(obj->adc->intr & MXC_F_ADC_INTR_ADC_DONE_IF)); |
<> | 149:156823d33999 | 135 | |
<> | 149:156823d33999 | 136 | // Get sample from the fifo |
<> | 149:156823d33999 | 137 | uint16_t sample = obj->adc->data; |
<> | 149:156823d33999 | 138 | |
<> | 149:156823d33999 | 139 | // Check for overflow, hardware will report overflow as 0 |
<> | 149:156823d33999 | 140 | if (obj->adc->status & MXC_F_ADC_STATUS_ADC_OVERFLOW) { |
<> | 149:156823d33999 | 141 | sample = (uint16_t)ADC_FULL_SCALE; |
<> | 149:156823d33999 | 142 | } |
<> | 149:156823d33999 | 143 | |
<> | 149:156823d33999 | 144 | return sample; |
<> | 149:156823d33999 | 145 | } |