mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
targets/TARGET_Cypress/TARGET_PSOC6/analogin_api.c@188:bcfe06ba3d64, 2018-11-08 (annotated)
- Committer:
- AnnaBridge
- Date:
- Thu Nov 08 11:46:34 2018 +0000
- Revision:
- 188:bcfe06ba3d64
- Child:
- 189:f392fc9709a3
mbed-dev library. Release version 164
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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AnnaBridge | 188:bcfe06ba3d64 | 1 | /* |
AnnaBridge | 188:bcfe06ba3d64 | 2 | * mbed Microcontroller Library |
AnnaBridge | 188:bcfe06ba3d64 | 3 | * Copyright (c) 2017-2018 Future Electronics |
AnnaBridge | 188:bcfe06ba3d64 | 4 | * |
AnnaBridge | 188:bcfe06ba3d64 | 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
AnnaBridge | 188:bcfe06ba3d64 | 6 | * you may not use this file except in compliance with the License. |
AnnaBridge | 188:bcfe06ba3d64 | 7 | * You may obtain a copy of the License at |
AnnaBridge | 188:bcfe06ba3d64 | 8 | * |
AnnaBridge | 188:bcfe06ba3d64 | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
AnnaBridge | 188:bcfe06ba3d64 | 10 | * |
AnnaBridge | 188:bcfe06ba3d64 | 11 | * Unless required by applicable law or agreed to in writing, software |
AnnaBridge | 188:bcfe06ba3d64 | 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
AnnaBridge | 188:bcfe06ba3d64 | 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
AnnaBridge | 188:bcfe06ba3d64 | 14 | * See the License for the specific language governing permissions and |
AnnaBridge | 188:bcfe06ba3d64 | 15 | * limitations under the License. |
AnnaBridge | 188:bcfe06ba3d64 | 16 | */ |
AnnaBridge | 188:bcfe06ba3d64 | 17 | |
AnnaBridge | 188:bcfe06ba3d64 | 18 | #include "device.h" |
AnnaBridge | 188:bcfe06ba3d64 | 19 | #include "analogin_api.h" |
AnnaBridge | 188:bcfe06ba3d64 | 20 | #include "cy_sar.h" |
AnnaBridge | 188:bcfe06ba3d64 | 21 | #include "psoc6_utils.h" |
AnnaBridge | 188:bcfe06ba3d64 | 22 | #include "mbed_assert.h" |
AnnaBridge | 188:bcfe06ba3d64 | 23 | #include "mbed_error.h" |
AnnaBridge | 188:bcfe06ba3d64 | 24 | #include "pinmap.h" |
AnnaBridge | 188:bcfe06ba3d64 | 25 | #include "PeripheralPins.h" |
AnnaBridge | 188:bcfe06ba3d64 | 26 | #include "platform/mbed_error.h" |
AnnaBridge | 188:bcfe06ba3d64 | 27 | |
AnnaBridge | 188:bcfe06ba3d64 | 28 | #if DEVICE_ANALOGIN |
AnnaBridge | 188:bcfe06ba3d64 | 29 | |
AnnaBridge | 188:bcfe06ba3d64 | 30 | const uint16_t ADC_MAX_VALUE = 0x0fff; |
AnnaBridge | 188:bcfe06ba3d64 | 31 | |
AnnaBridge | 188:bcfe06ba3d64 | 32 | const uint32_t SAR_BASE_CLOCK_HZ = 18000000; // 18 MHz or less |
AnnaBridge | 188:bcfe06ba3d64 | 33 | |
AnnaBridge | 188:bcfe06ba3d64 | 34 | /** Default SAR channel configuration. |
AnnaBridge | 188:bcfe06ba3d64 | 35 | * Notice, that because dynamic SAR MUX switching is disabled, |
AnnaBridge | 188:bcfe06ba3d64 | 36 | * per-channel MUX configuration is ignored, thus not configured here. |
AnnaBridge | 188:bcfe06ba3d64 | 37 | */ |
AnnaBridge | 188:bcfe06ba3d64 | 38 | #define DEFAULT_CHANNEL_CONFIG ( \ |
AnnaBridge | 188:bcfe06ba3d64 | 39 | CY_SAR_CHAN_SINGLE_ENDED | \ |
AnnaBridge | 188:bcfe06ba3d64 | 40 | CY_SAR_CHAN_AVG_ENABLE | \ |
AnnaBridge | 188:bcfe06ba3d64 | 41 | CY_SAR_CHAN_SAMPLE_TIME_0 \ |
AnnaBridge | 188:bcfe06ba3d64 | 42 | ) |
AnnaBridge | 188:bcfe06ba3d64 | 43 | |
AnnaBridge | 188:bcfe06ba3d64 | 44 | |
AnnaBridge | 188:bcfe06ba3d64 | 45 | /** Global SAR configuration data, modified as channels are configured. |
AnnaBridge | 188:bcfe06ba3d64 | 46 | */ |
AnnaBridge | 188:bcfe06ba3d64 | 47 | static cy_stc_sar_config_t sar_config = { |
AnnaBridge | 188:bcfe06ba3d64 | 48 | .ctrl = CY_SAR_VREF_SEL_VDDA_DIV_2 | |
AnnaBridge | 188:bcfe06ba3d64 | 49 | CY_SAR_NEG_SEL_VREF | |
AnnaBridge | 188:bcfe06ba3d64 | 50 | CY_SAR_CTRL_COMP_DLY_12 | |
AnnaBridge | 188:bcfe06ba3d64 | 51 | CY_SAR_COMP_PWR_50 | |
AnnaBridge | 188:bcfe06ba3d64 | 52 | CY_SAR_SARSEQ_SWITCH_DISABLE, /**< Control register */ |
AnnaBridge | 188:bcfe06ba3d64 | 53 | .sampleCtrl = CY_SAR_RIGHT_ALIGN | |
AnnaBridge | 188:bcfe06ba3d64 | 54 | CY_SAR_SINGLE_ENDED_UNSIGNED | |
AnnaBridge | 188:bcfe06ba3d64 | 55 | CY_SAR_AVG_CNT_16 | |
AnnaBridge | 188:bcfe06ba3d64 | 56 | CY_SAR_AVG_MODE_SEQUENTIAL_FIXED | |
AnnaBridge | 188:bcfe06ba3d64 | 57 | CY_SAR_TRIGGER_MODE_FW_ONLY, /**< Sample control register */ |
AnnaBridge | 188:bcfe06ba3d64 | 58 | .sampleTime01 = (4uL << CY_SAR_SAMPLE_TIME0_SHIFT) | |
AnnaBridge | 188:bcfe06ba3d64 | 59 | (4uL << CY_SAR_SAMPLE_TIME1_SHIFT), /**< Sample time in ADC clocks for ST0 and ST1 */ |
AnnaBridge | 188:bcfe06ba3d64 | 60 | .sampleTime23 = (4uL << CY_SAR_SAMPLE_TIME2_SHIFT) | |
AnnaBridge | 188:bcfe06ba3d64 | 61 | (4uL << CY_SAR_SAMPLE_TIME3_SHIFT), /**< Sample time in ADC clocks for ST2 and ST3 */ |
AnnaBridge | 188:bcfe06ba3d64 | 62 | .rangeThres = 0, /**< Range detect threshold register for all channels (unused)*/ |
AnnaBridge | 188:bcfe06ba3d64 | 63 | .rangeCond = 0, /**< Range detect mode for all channels (unused)*/ |
AnnaBridge | 188:bcfe06ba3d64 | 64 | .chanEn = 0, /**< Enable bits for the channels */ |
AnnaBridge | 188:bcfe06ba3d64 | 65 | .chanConfig = { /**< Channel configuration registers */ |
AnnaBridge | 188:bcfe06ba3d64 | 66 | DEFAULT_CHANNEL_CONFIG, // chn 0 |
AnnaBridge | 188:bcfe06ba3d64 | 67 | DEFAULT_CHANNEL_CONFIG, // chn 1 |
AnnaBridge | 188:bcfe06ba3d64 | 68 | DEFAULT_CHANNEL_CONFIG, // chn 2 |
AnnaBridge | 188:bcfe06ba3d64 | 69 | DEFAULT_CHANNEL_CONFIG, // chn 3 |
AnnaBridge | 188:bcfe06ba3d64 | 70 | DEFAULT_CHANNEL_CONFIG, // chn 4 |
AnnaBridge | 188:bcfe06ba3d64 | 71 | DEFAULT_CHANNEL_CONFIG, // chn 5 |
AnnaBridge | 188:bcfe06ba3d64 | 72 | DEFAULT_CHANNEL_CONFIG, // chn 6 |
AnnaBridge | 188:bcfe06ba3d64 | 73 | DEFAULT_CHANNEL_CONFIG, // chn 7 |
AnnaBridge | 188:bcfe06ba3d64 | 74 | DEFAULT_CHANNEL_CONFIG, // chn 8 |
AnnaBridge | 188:bcfe06ba3d64 | 75 | DEFAULT_CHANNEL_CONFIG, // chn 9 |
AnnaBridge | 188:bcfe06ba3d64 | 76 | DEFAULT_CHANNEL_CONFIG, // chn 10 |
AnnaBridge | 188:bcfe06ba3d64 | 77 | DEFAULT_CHANNEL_CONFIG, // chn 11 |
AnnaBridge | 188:bcfe06ba3d64 | 78 | DEFAULT_CHANNEL_CONFIG, // chn 12 |
AnnaBridge | 188:bcfe06ba3d64 | 79 | DEFAULT_CHANNEL_CONFIG, // chn 13 |
AnnaBridge | 188:bcfe06ba3d64 | 80 | DEFAULT_CHANNEL_CONFIG, // chn 14 |
AnnaBridge | 188:bcfe06ba3d64 | 81 | DEFAULT_CHANNEL_CONFIG, // chn 15 |
AnnaBridge | 188:bcfe06ba3d64 | 82 | }, |
AnnaBridge | 188:bcfe06ba3d64 | 83 | .intrMask = 0, /**< Interrupt enable mask */ |
AnnaBridge | 188:bcfe06ba3d64 | 84 | .satIntrMask = 0, /**< Saturate interrupt mask register */ |
AnnaBridge | 188:bcfe06ba3d64 | 85 | .rangeIntrMask = 0, /**< Range interrupt mask register */ |
AnnaBridge | 188:bcfe06ba3d64 | 86 | .muxSwitch = 0, /**< SARMUX firmware switches to connect analog signals to SAR */ |
AnnaBridge | 188:bcfe06ba3d64 | 87 | .muxSwitchSqCtrl = 0, /**< SARMUX Switch SAR sequencer control */ |
AnnaBridge | 188:bcfe06ba3d64 | 88 | .configRouting = false, /**< Configure or ignore routing related registers (muxSwitch, muxSwitchSqCtrl) */ |
AnnaBridge | 188:bcfe06ba3d64 | 89 | .vrefMvValue = 0, /**< Reference voltage in millivolts used in counts to volts conversion */ |
AnnaBridge | 188:bcfe06ba3d64 | 90 | }; |
AnnaBridge | 188:bcfe06ba3d64 | 91 | |
AnnaBridge | 188:bcfe06ba3d64 | 92 | static bool sar_initialized = false; |
AnnaBridge | 188:bcfe06ba3d64 | 93 | |
AnnaBridge | 188:bcfe06ba3d64 | 94 | |
AnnaBridge | 188:bcfe06ba3d64 | 95 | static void sar_init(analogin_t *obj) |
AnnaBridge | 188:bcfe06ba3d64 | 96 | { |
AnnaBridge | 188:bcfe06ba3d64 | 97 | if (!sar_initialized) { |
AnnaBridge | 188:bcfe06ba3d64 | 98 | uint32_t sar_clock_divider = CY_INVALID_DIVIDER; |
AnnaBridge | 188:bcfe06ba3d64 | 99 | |
AnnaBridge | 188:bcfe06ba3d64 | 100 | sar_initialized = true; |
AnnaBridge | 188:bcfe06ba3d64 | 101 | // Allocate and setup clock. |
AnnaBridge | 188:bcfe06ba3d64 | 102 | sar_clock_divider = cy_clk_allocate_divider(CY_SYSCLK_DIV_8_BIT); |
AnnaBridge | 188:bcfe06ba3d64 | 103 | if (sar_clock_divider == CY_INVALID_DIVIDER) { |
AnnaBridge | 188:bcfe06ba3d64 | 104 | error("SAR clock divider allocation failed."); |
AnnaBridge | 188:bcfe06ba3d64 | 105 | return; |
AnnaBridge | 188:bcfe06ba3d64 | 106 | } |
AnnaBridge | 188:bcfe06ba3d64 | 107 | Cy_SysClk_PeriphSetDivider(CY_SYSCLK_DIV_8_BIT, |
AnnaBridge | 188:bcfe06ba3d64 | 108 | sar_clock_divider, |
AnnaBridge | 188:bcfe06ba3d64 | 109 | ((CY_CLK_PERICLK_FREQ_HZ + SAR_BASE_CLOCK_HZ / 2) / SAR_BASE_CLOCK_HZ) - 1); |
AnnaBridge | 188:bcfe06ba3d64 | 110 | Cy_SysClk_PeriphEnableDivider(CY_SYSCLK_DIV_8_BIT, sar_clock_divider); |
AnnaBridge | 188:bcfe06ba3d64 | 111 | Cy_SysClk_PeriphAssignDivider(obj->clock, CY_SYSCLK_DIV_8_BIT, sar_clock_divider); |
AnnaBridge | 188:bcfe06ba3d64 | 112 | |
AnnaBridge | 188:bcfe06ba3d64 | 113 | Cy_SAR_Init(obj->base, &sar_config); |
AnnaBridge | 188:bcfe06ba3d64 | 114 | Cy_SAR_Enable(obj->base); |
AnnaBridge | 188:bcfe06ba3d64 | 115 | } |
AnnaBridge | 188:bcfe06ba3d64 | 116 | } |
AnnaBridge | 188:bcfe06ba3d64 | 117 | |
AnnaBridge | 188:bcfe06ba3d64 | 118 | void analogin_init(analogin_t *obj, PinName pin) |
AnnaBridge | 188:bcfe06ba3d64 | 119 | { |
AnnaBridge | 188:bcfe06ba3d64 | 120 | uint32_t sar = 0; |
AnnaBridge | 188:bcfe06ba3d64 | 121 | uint32_t sar_function = 0; |
AnnaBridge | 188:bcfe06ba3d64 | 122 | |
AnnaBridge | 188:bcfe06ba3d64 | 123 | MBED_ASSERT(obj); |
AnnaBridge | 188:bcfe06ba3d64 | 124 | MBED_ASSERT(pin != (PinName)NC); |
AnnaBridge | 188:bcfe06ba3d64 | 125 | |
AnnaBridge | 188:bcfe06ba3d64 | 126 | |
AnnaBridge | 188:bcfe06ba3d64 | 127 | sar = pinmap_peripheral(pin, PinMap_ADC); |
AnnaBridge | 188:bcfe06ba3d64 | 128 | if (sar != (uint32_t)NC) { |
AnnaBridge | 188:bcfe06ba3d64 | 129 | if (cy_reserve_io_pin(pin)) { |
AnnaBridge | 188:bcfe06ba3d64 | 130 | error("ANALOG IN pin reservation conflict."); |
AnnaBridge | 188:bcfe06ba3d64 | 131 | } |
AnnaBridge | 188:bcfe06ba3d64 | 132 | obj->base = (SAR_Type*)CY_PERIPHERAL_BASE(sar); |
AnnaBridge | 188:bcfe06ba3d64 | 133 | obj->pin = pin; |
AnnaBridge | 188:bcfe06ba3d64 | 134 | obj->channel_mask = 1 << CY_PIN(pin); |
AnnaBridge | 188:bcfe06ba3d64 | 135 | |
AnnaBridge | 188:bcfe06ba3d64 | 136 | // Configure clock. |
AnnaBridge | 188:bcfe06ba3d64 | 137 | sar_function = pinmap_function(pin, PinMap_ADC); |
AnnaBridge | 188:bcfe06ba3d64 | 138 | obj->clock = CY_PIN_CLOCK(sar_function); |
AnnaBridge | 188:bcfe06ba3d64 | 139 | sar_init(obj); |
AnnaBridge | 188:bcfe06ba3d64 | 140 | pin_function(pin, sar_function); |
AnnaBridge | 188:bcfe06ba3d64 | 141 | } else { |
AnnaBridge | 188:bcfe06ba3d64 | 142 | error("ANALOG IN pinout mismatch."); |
AnnaBridge | 188:bcfe06ba3d64 | 143 | } |
AnnaBridge | 188:bcfe06ba3d64 | 144 | } |
AnnaBridge | 188:bcfe06ba3d64 | 145 | |
AnnaBridge | 188:bcfe06ba3d64 | 146 | float analogin_read(analogin_t *obj) |
AnnaBridge | 188:bcfe06ba3d64 | 147 | { |
AnnaBridge | 188:bcfe06ba3d64 | 148 | uint16_t result = analogin_read_u16(obj); |
AnnaBridge | 188:bcfe06ba3d64 | 149 | |
AnnaBridge | 188:bcfe06ba3d64 | 150 | return (float)result * (1.0 / ADC_MAX_VALUE); |
AnnaBridge | 188:bcfe06ba3d64 | 151 | } |
AnnaBridge | 188:bcfe06ba3d64 | 152 | |
AnnaBridge | 188:bcfe06ba3d64 | 153 | uint16_t analogin_read_u16(analogin_t *obj) |
AnnaBridge | 188:bcfe06ba3d64 | 154 | { |
AnnaBridge | 188:bcfe06ba3d64 | 155 | uint32_t result = 0; |
AnnaBridge | 188:bcfe06ba3d64 | 156 | |
AnnaBridge | 188:bcfe06ba3d64 | 157 | Cy_SAR_SetChanMask(obj->base, obj->channel_mask); |
AnnaBridge | 188:bcfe06ba3d64 | 158 | Cy_SAR_SetAnalogSwitch(obj->base, CY_SAR_MUX_SWITCH0, obj->channel_mask, CY_SAR_SWITCH_CLOSE); |
AnnaBridge | 188:bcfe06ba3d64 | 159 | Cy_SAR_StartConvert(obj->base, CY_SAR_START_CONVERT_SINGLE_SHOT); |
AnnaBridge | 188:bcfe06ba3d64 | 160 | if (Cy_SAR_IsEndConversion(obj->base, CY_SAR_WAIT_FOR_RESULT) == CY_SAR_SUCCESS) { |
AnnaBridge | 188:bcfe06ba3d64 | 161 | result = Cy_SAR_GetResult32(obj->base, CY_PIN(obj->pin)); |
AnnaBridge | 188:bcfe06ba3d64 | 162 | } else { |
AnnaBridge | 188:bcfe06ba3d64 | 163 | error("ANALOG IN: measurement failed!"); |
AnnaBridge | 188:bcfe06ba3d64 | 164 | } |
AnnaBridge | 188:bcfe06ba3d64 | 165 | Cy_SAR_SetAnalogSwitch(obj->base, CY_SAR_MUX_SWITCH0, obj->channel_mask, CY_SAR_SWITCH_OPEN); |
AnnaBridge | 188:bcfe06ba3d64 | 166 | // We are running 16x oversampling extending results to 16 bits. |
AnnaBridge | 188:bcfe06ba3d64 | 167 | return (uint16_t)(result); |
AnnaBridge | 188:bcfe06ba3d64 | 168 | } |
AnnaBridge | 188:bcfe06ba3d64 | 169 | |
AnnaBridge | 188:bcfe06ba3d64 | 170 | #endif // DEVICE_ANALOGIN |
AnnaBridge | 188:bcfe06ba3d64 | 171 |