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/hal/TARGET_Maxim/TARGET_MAX32610/analogin_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)
- Committer:
- bogdanm
- Date:
- Thu Oct 01 15:25:22 2015 +0300
- Revision:
- 0:9b334a45a8ff
- Child:
- 144:ef7eb2e8f9f7
Initial commit on mbed-dev
Replaces mbed-src (now inactive)
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bogdanm | 0:9b334a45a8ff | 1 | /******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 2 | * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved. |
bogdanm | 0:9b334a45a8ff | 3 | * |
bogdanm | 0:9b334a45a8ff | 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
bogdanm | 0:9b334a45a8ff | 5 | * copy of this software and associated documentation files (the "Software"), |
bogdanm | 0:9b334a45a8ff | 6 | * to deal in the Software without restriction, including without limitation |
bogdanm | 0:9b334a45a8ff | 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
bogdanm | 0:9b334a45a8ff | 8 | * and/or sell copies of the Software, and to permit persons to whom the |
bogdanm | 0:9b334a45a8ff | 9 | * Software is furnished to do so, subject to the following conditions: |
bogdanm | 0:9b334a45a8ff | 10 | * |
bogdanm | 0:9b334a45a8ff | 11 | * The above copyright notice and this permission notice shall be included |
bogdanm | 0:9b334a45a8ff | 12 | * in all copies or substantial portions of the Software. |
bogdanm | 0:9b334a45a8ff | 13 | * |
bogdanm | 0:9b334a45a8ff | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
bogdanm | 0:9b334a45a8ff | 15 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
bogdanm | 0:9b334a45a8ff | 16 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
bogdanm | 0:9b334a45a8ff | 17 | * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES |
bogdanm | 0:9b334a45a8ff | 18 | * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
bogdanm | 0:9b334a45a8ff | 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
bogdanm | 0:9b334a45a8ff | 20 | * OTHER DEALINGS IN THE SOFTWARE. |
bogdanm | 0:9b334a45a8ff | 21 | * |
bogdanm | 0:9b334a45a8ff | 22 | * Except as contained in this notice, the name of Maxim Integrated |
bogdanm | 0:9b334a45a8ff | 23 | * Products, Inc. shall not be used except as stated in the Maxim Integrated |
bogdanm | 0:9b334a45a8ff | 24 | * Products, Inc. Branding Policy. |
bogdanm | 0:9b334a45a8ff | 25 | * |
bogdanm | 0:9b334a45a8ff | 26 | * The mere transfer of this software does not imply any licenses |
bogdanm | 0:9b334a45a8ff | 27 | * of trade secrets, proprietary technology, copyrights, patents, |
bogdanm | 0:9b334a45a8ff | 28 | * trademarks, maskwork rights, or any other form of intellectual |
bogdanm | 0:9b334a45a8ff | 29 | * property whatsoever. Maxim Integrated Products, Inc. retains all |
bogdanm | 0:9b334a45a8ff | 30 | * ownership rights. |
bogdanm | 0:9b334a45a8ff | 31 | ******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 32 | */ |
bogdanm | 0:9b334a45a8ff | 33 | |
bogdanm | 0:9b334a45a8ff | 34 | #include "mbed_assert.h" |
bogdanm | 0:9b334a45a8ff | 35 | #include "analogin_api.h" |
bogdanm | 0:9b334a45a8ff | 36 | #include "clkman_regs.h" |
bogdanm | 0:9b334a45a8ff | 37 | #include "pwrman_regs.h" |
bogdanm | 0:9b334a45a8ff | 38 | #include "afe_regs.h" |
bogdanm | 0:9b334a45a8ff | 39 | #include "PeripheralPins.h" |
bogdanm | 0:9b334a45a8ff | 40 | |
bogdanm | 0:9b334a45a8ff | 41 | #define PGA_TRK_CNT 0x1F |
bogdanm | 0:9b334a45a8ff | 42 | #define ADC_ACT_CNT 0x1 |
bogdanm | 0:9b334a45a8ff | 43 | #define ADC_PGA_CNT 0x1 |
bogdanm | 0:9b334a45a8ff | 44 | #define ADC_ACQ_CNT 0x1 |
bogdanm | 0:9b334a45a8ff | 45 | #define ADC_SLP_CNT 0x1 |
bogdanm | 0:9b334a45a8ff | 46 | |
bogdanm | 0:9b334a45a8ff | 47 | //****************************************************************************** |
bogdanm | 0:9b334a45a8ff | 48 | void analogin_init(analogin_t *obj, PinName pin) |
bogdanm | 0:9b334a45a8ff | 49 | { |
bogdanm | 0:9b334a45a8ff | 50 | // Make sure pin is an analog pin we can use for ADC |
bogdanm | 0:9b334a45a8ff | 51 | MBED_ASSERT((ADCName)pinmap_peripheral(pin, PinMap_ADC) != (ADCName)NC); |
bogdanm | 0:9b334a45a8ff | 52 | |
bogdanm | 0:9b334a45a8ff | 53 | // Set the object pointer |
bogdanm | 0:9b334a45a8ff | 54 | obj->adc = MXC_ADC; |
bogdanm | 0:9b334a45a8ff | 55 | obj->adccfg = MXC_ADCCFG; |
bogdanm | 0:9b334a45a8ff | 56 | obj->adc_fifo = MXC_ADC_FIFO; |
bogdanm | 0:9b334a45a8ff | 57 | obj->adc_pin = pin; |
bogdanm | 0:9b334a45a8ff | 58 | |
bogdanm | 0:9b334a45a8ff | 59 | // Set the ADC clock to the system clock frequency |
bogdanm | 0:9b334a45a8ff | 60 | MXC_SET_FIELD(&MXC_CLKMAN->clk_ctrl, MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT, |
bogdanm | 0:9b334a45a8ff | 61 | (MXC_F_CLKMAN_CLK_CTRL_ADC_GATE_N | (MXC_E_CLKMAN_ADC_SOURCE_SELECT_SYSTEM << |
bogdanm | 0:9b334a45a8ff | 62 | MXC_F_CLKMAN_CLK_CTRL_ADC_SOURCE_SELECT_POS))); |
bogdanm | 0:9b334a45a8ff | 63 | |
bogdanm | 0:9b334a45a8ff | 64 | // Enable AFE power |
bogdanm | 0:9b334a45a8ff | 65 | MXC_PWRMAN->pwr_rst_ctrl |= MXC_F_PWRMAN_PWR_RST_CTRL_AFE_POWERED; |
bogdanm | 0:9b334a45a8ff | 66 | |
bogdanm | 0:9b334a45a8ff | 67 | // Setup and hold window |
bogdanm | 0:9b334a45a8ff | 68 | MXC_SET_FIELD(&obj->adc->tg_ctrl0, MXC_F_ADC_TG_CTRL0_PGA_TRK_CNT, PGA_TRK_CNT); |
bogdanm | 0:9b334a45a8ff | 69 | |
bogdanm | 0:9b334a45a8ff | 70 | // Setup sampling count and timing |
bogdanm | 0:9b334a45a8ff | 71 | MXC_SET_FIELD(&obj->adc->tg_ctrl1, (MXC_F_ADC_TG_CTRL1_PGA_ACQ_CNT | |
bogdanm | 0:9b334a45a8ff | 72 | MXC_F_ADC_TG_CTRL1_ADC_ACQ_CNT | MXC_F_ADC_TG_CTRL1_ADC_SLP_CNT), |
bogdanm | 0:9b334a45a8ff | 73 | ((ADC_PGA_CNT << MXC_F_ADC_TG_CTRL1_PGA_ACQ_CNT_POS) | |
bogdanm | 0:9b334a45a8ff | 74 | (ADC_ACQ_CNT << MXC_F_ADC_TG_CTRL1_ADC_ACQ_CNT_POS) | |
bogdanm | 0:9b334a45a8ff | 75 | (ADC_SLP_CNT << MXC_F_ADC_TG_CTRL1_ADC_SLP_CNT_POS) | |
bogdanm | 0:9b334a45a8ff | 76 | (MXC_F_ADC_TG_CTRL1_ADC_BRST_CNT))); |
bogdanm | 0:9b334a45a8ff | 77 | } |
bogdanm | 0:9b334a45a8ff | 78 | |
bogdanm | 0:9b334a45a8ff | 79 | //****************************************************************************** |
bogdanm | 0:9b334a45a8ff | 80 | float analogin_read(analogin_t *obj) |
bogdanm | 0:9b334a45a8ff | 81 | { |
bogdanm | 0:9b334a45a8ff | 82 | // Convert integer to float |
bogdanm | 0:9b334a45a8ff | 83 | return (((float)analogin_read_u16(obj)/(float)0xFFFF)); |
bogdanm | 0:9b334a45a8ff | 84 | } |
bogdanm | 0:9b334a45a8ff | 85 | |
bogdanm | 0:9b334a45a8ff | 86 | //****************************************************************************** |
bogdanm | 0:9b334a45a8ff | 87 | uint16_t analogin_read_u16(analogin_t *obj) |
bogdanm | 0:9b334a45a8ff | 88 | { |
bogdanm | 0:9b334a45a8ff | 89 | // Set the pin to take readings from |
bogdanm | 0:9b334a45a8ff | 90 | unsigned mux_pos; |
bogdanm | 0:9b334a45a8ff | 91 | unsigned diff = 0; |
bogdanm | 0:9b334a45a8ff | 92 | if(obj->adc_pin >> PORT_SHIFT == 0xB) { |
bogdanm | 0:9b334a45a8ff | 93 | mux_pos = (obj->adc_pin & 0xF) + 8; |
bogdanm | 0:9b334a45a8ff | 94 | } else { |
bogdanm | 0:9b334a45a8ff | 95 | mux_pos = (obj->adc_pin & 0xF); |
bogdanm | 0:9b334a45a8ff | 96 | } |
bogdanm | 0:9b334a45a8ff | 97 | |
bogdanm | 0:9b334a45a8ff | 98 | if(obj->adc_pin >> PORT_SHIFT == 0xC) { |
bogdanm | 0:9b334a45a8ff | 99 | diff = 1; |
bogdanm | 0:9b334a45a8ff | 100 | mux_pos = (obj->adc_pin & 0xF) + 8; |
bogdanm | 0:9b334a45a8ff | 101 | } |
bogdanm | 0:9b334a45a8ff | 102 | |
bogdanm | 0:9b334a45a8ff | 103 | // Reset the ADC |
bogdanm | 0:9b334a45a8ff | 104 | obj->adc->ctrl0 |= MXC_F_ADC_CTRL0_CPU_ADC_RST; |
bogdanm | 0:9b334a45a8ff | 105 | |
bogdanm | 0:9b334a45a8ff | 106 | // Enable the ADC |
bogdanm | 0:9b334a45a8ff | 107 | obj->adc->ctrl0 |= MXC_F_ADC_CTRL0_CPU_ADC_EN; |
bogdanm | 0:9b334a45a8ff | 108 | |
bogdanm | 0:9b334a45a8ff | 109 | // Setup the ADC clock |
bogdanm | 0:9b334a45a8ff | 110 | MXC_SET_FIELD(&obj->adc->ctrl0, (MXC_F_ADC_CTRL0_ADC_MODE | MXC_F_ADC_CTRL0_AVG_MODE | |
bogdanm | 0:9b334a45a8ff | 111 | MXC_F_ADC_CTRL0_ADC_CLK_MODE | MXC_F_ADC_CTRL0_ADC_BI_POL), |
bogdanm | 0:9b334a45a8ff | 112 | ((MXC_E_ADC_MODE_SMPLCNT_FULL_RATE << MXC_F_ADC_CTRL0_ADC_MODE_POS) | |
bogdanm | 0:9b334a45a8ff | 113 | (MXC_E_ADC_AVG_MODE_FILTER_OUTPUT << MXC_F_ADC_CTRL0_AVG_MODE_POS) | |
bogdanm | 0:9b334a45a8ff | 114 | (0x2 << MXC_F_ADC_CTRL0_ADC_CLK_MODE_POS) | |
bogdanm | 0:9b334a45a8ff | 115 | MXC_F_ADC_CTRL0_ADC_CLK_EN)); |
bogdanm | 0:9b334a45a8ff | 116 | |
bogdanm | 0:9b334a45a8ff | 117 | // Setup the input multiplexor |
bogdanm | 0:9b334a45a8ff | 118 | MXC_SET_FIELD(&obj->adc->pga_ctrl, (MXC_F_ADC_PGA_CTRL_MUX_CH_SEL | |
bogdanm | 0:9b334a45a8ff | 119 | MXC_F_ADC_PGA_CTRL_MUX_DIFF | MXC_F_ADC_PGA_CTRL_PGA_GAIN), |
bogdanm | 0:9b334a45a8ff | 120 | ((mux_pos << MXC_F_ADC_PGA_CTRL_MUX_CH_SEL_POS) | |
bogdanm | 0:9b334a45a8ff | 121 | (diff << MXC_F_ADC_PGA_CTRL_MUX_DIFF_POS))); |
bogdanm | 0:9b334a45a8ff | 122 | |
bogdanm | 0:9b334a45a8ff | 123 | // Setup voltage reference |
bogdanm | 0:9b334a45a8ff | 124 | MXC_SET_FIELD(&MXC_AFE->ctrl1, MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL, |
bogdanm | 0:9b334a45a8ff | 125 | (MXC_F_AFE_CTRL1_REF_ADC_POWERUP | MXC_F_AFE_CTRL1_REF_BLK_POWERUP | |
bogdanm | 0:9b334a45a8ff | 126 | (MXC_E_AFE_REF_VOLT_SEL_1500 << MXC_F_AFE_CTRL1_REF_ADC_VOLT_SEL_POS))); |
bogdanm | 0:9b334a45a8ff | 127 | |
bogdanm | 0:9b334a45a8ff | 128 | // Clear the done bit |
bogdanm | 0:9b334a45a8ff | 129 | obj->adc->intr = MXC_F_ADC_INTR_DONE_IF; |
bogdanm | 0:9b334a45a8ff | 130 | |
bogdanm | 0:9b334a45a8ff | 131 | // Take one sample |
bogdanm | 0:9b334a45a8ff | 132 | obj->adc->tg_ctrl0 |= (1 << MXC_F_ADC_TG_CTRL0_ADC_SMPL_CNT_POS); |
bogdanm | 0:9b334a45a8ff | 133 | |
bogdanm | 0:9b334a45a8ff | 134 | // Set the start bit to take the sample |
bogdanm | 0:9b334a45a8ff | 135 | obj->adc->ctrl0 |= MXC_F_ADC_CTRL0_CPU_ADC_START; |
bogdanm | 0:9b334a45a8ff | 136 | |
bogdanm | 0:9b334a45a8ff | 137 | // Wait for the conversion to complete |
bogdanm | 0:9b334a45a8ff | 138 | while(!(obj->adc->intr & MXC_F_ADC_INTR_DONE_IF)) {} |
bogdanm | 0:9b334a45a8ff | 139 | |
bogdanm | 0:9b334a45a8ff | 140 | // Get sample from the fifo |
bogdanm | 0:9b334a45a8ff | 141 | uint16_t sample = (uint16_t)(obj->adc->out & 0xFFFF); |
bogdanm | 0:9b334a45a8ff | 142 | |
bogdanm | 0:9b334a45a8ff | 143 | // Disable ADC |
bogdanm | 0:9b334a45a8ff | 144 | obj->adc->ctrl0 &= ~MXC_F_ADC_CTRL0_CPU_ADC_EN; |
bogdanm | 0:9b334a45a8ff | 145 | |
bogdanm | 0:9b334a45a8ff | 146 | return (sample - 1); |
bogdanm | 0:9b334a45a8ff | 147 | } |