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mbed library sources. Supersedes mbed-src.

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targets/TARGET_Cypress/TARGET_PSOC6/analogout_api.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
188:bcfe06ba3d64 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 188:bcfe06ba3d64 1 /*
AnnaBridge 188:bcfe06ba3d64 2 * mbed Microcontroller Library
AnnaBridge 188:bcfe06ba3d64 3 * Copyright (c) 2017-2018 Future Electronics
AnnaBridge 189:f392fc9709a3 4 * Copyright (c) 2018-2019 Cypress Semiconductor Corporation
AnnaBridge 189:f392fc9709a3 5 * SPDX-License-Identifier: Apache-2.0
AnnaBridge 188:bcfe06ba3d64 6 *
AnnaBridge 188:bcfe06ba3d64 7 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 188:bcfe06ba3d64 8 * you may not use this file except in compliance with the License.
AnnaBridge 188:bcfe06ba3d64 9 * You may obtain a copy of the License at
AnnaBridge 188:bcfe06ba3d64 10 *
AnnaBridge 188:bcfe06ba3d64 11 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 188:bcfe06ba3d64 12 *
AnnaBridge 188:bcfe06ba3d64 13 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 188:bcfe06ba3d64 14 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 188:bcfe06ba3d64 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 188:bcfe06ba3d64 16 * See the License for the specific language governing permissions and
AnnaBridge 188:bcfe06ba3d64 17 * limitations under the License.
AnnaBridge 188:bcfe06ba3d64 18 */
AnnaBridge 188:bcfe06ba3d64 19
AnnaBridge 188:bcfe06ba3d64 20 #include "device.h"
AnnaBridge 188:bcfe06ba3d64 21 #include "analogout_api.h"
AnnaBridge 188:bcfe06ba3d64 22 #include "cy_ctdac.h"
AnnaBridge 188:bcfe06ba3d64 23 #include "psoc6_utils.h"
AnnaBridge 188:bcfe06ba3d64 24 #include "mbed_assert.h"
AnnaBridge 188:bcfe06ba3d64 25 #include "mbed_error.h"
AnnaBridge 188:bcfe06ba3d64 26 #include "pinmap.h"
AnnaBridge 188:bcfe06ba3d64 27 #include "PeripheralPins.h"
AnnaBridge 188:bcfe06ba3d64 28 #include "platform/mbed_error.h"
AnnaBridge 188:bcfe06ba3d64 29
AnnaBridge 188:bcfe06ba3d64 30 #if DEVICE_ANALOGOUT
AnnaBridge 188:bcfe06ba3d64 31
AnnaBridge 188:bcfe06ba3d64 32 #define CTDAC_NUM_BITS 12
AnnaBridge 188:bcfe06ba3d64 33 const uint16_t CTDAC_MAX_VALUE = (uint16_t)((1UL << CTDAC_NUM_BITS) - 1);
AnnaBridge 188:bcfe06ba3d64 34
AnnaBridge 188:bcfe06ba3d64 35 const uint32_t CTDAC_BASE_CLOCK_HZ = 500000; // 500 kHz or less
AnnaBridge 188:bcfe06ba3d64 36
AnnaBridge 188:bcfe06ba3d64 37 #define CTDAC_DEGLITCH_CYCLES 35
AnnaBridge 188:bcfe06ba3d64 38
AnnaBridge 188:bcfe06ba3d64 39
AnnaBridge 188:bcfe06ba3d64 40
AnnaBridge 188:bcfe06ba3d64 41 /** Global CTDAC configuration data.
AnnaBridge 188:bcfe06ba3d64 42 */
AnnaBridge 188:bcfe06ba3d64 43 static cy_stc_ctdac_config_t ctdac_config = {
AnnaBridge 188:bcfe06ba3d64 44 .refSource = CY_CTDAC_REFSOURCE_VDDA, /**< Reference source: Vdda or externally through Opamp1 of CTB */
AnnaBridge 188:bcfe06ba3d64 45 .formatMode = CY_CTDAC_FORMAT_UNSIGNED, /**< Format of DAC value: signed or unsigned */
AnnaBridge 188:bcfe06ba3d64 46 .updateMode = CY_CTDAC_UPDATE_BUFFERED_WRITE, /**< Update mode: direct or buffered writes or hardware, edge or level */
AnnaBridge 188:bcfe06ba3d64 47 .deglitchMode = CY_CTDAC_DEGLITCHMODE_UNBUFFERED, /**< Deglitch mode: disabled, buffered, unbuffered, or both */
AnnaBridge 188:bcfe06ba3d64 48 .outputMode = CY_CTDAC_OUTPUT_VALUE, /**< Output mode: enabled (value or value + 1), high-z, Vssa, or Vdda */
AnnaBridge 188:bcfe06ba3d64 49 .outputBuffer = CY_CTDAC_OUTPUT_UNBUFFERED, /**< Output path: Buffered through Opamp0 of CTB or connected directly to Pin 6 */
AnnaBridge 188:bcfe06ba3d64 50 .deepSleep = CY_CTDAC_DEEPSLEEP_DISABLE, /**< Enable or disable the CTDAC during Deep Sleep */
AnnaBridge 188:bcfe06ba3d64 51 .deglitchCycles = CTDAC_DEGLITCH_CYCLES, /**< Number of deglitch cycles from 0 to 63 */
AnnaBridge 188:bcfe06ba3d64 52 .value = 0, /**< Current DAC value */
AnnaBridge 188:bcfe06ba3d64 53 .nextValue = 0, /**< Next DAC value for double buffering */
AnnaBridge 188:bcfe06ba3d64 54 .enableInterrupt = false, /**< If true, enable interrupt when next value register is transferred to value register */
AnnaBridge 188:bcfe06ba3d64 55 .configClock = false, /**< Configure or ignore clock information */
AnnaBridge 188:bcfe06ba3d64 56 };
AnnaBridge 188:bcfe06ba3d64 57
AnnaBridge 188:bcfe06ba3d64 58
AnnaBridge 188:bcfe06ba3d64 59 static bool ctdac_initialized = 0;
AnnaBridge 188:bcfe06ba3d64 60
AnnaBridge 188:bcfe06ba3d64 61 static void ctdac_init(dac_t *obj)
AnnaBridge 188:bcfe06ba3d64 62 {
AnnaBridge 188:bcfe06ba3d64 63 if (!ctdac_initialized) {
AnnaBridge 188:bcfe06ba3d64 64 uint32_t dac_clock_divider = CY_INVALID_DIVIDER;
AnnaBridge 188:bcfe06ba3d64 65
AnnaBridge 188:bcfe06ba3d64 66 ctdac_initialized = true;
AnnaBridge 188:bcfe06ba3d64 67 // Allocate and setup clock.
AnnaBridge 188:bcfe06ba3d64 68 dac_clock_divider = cy_clk_allocate_divider(CY_SYSCLK_DIV_8_BIT);
AnnaBridge 188:bcfe06ba3d64 69 if (dac_clock_divider == CY_INVALID_DIVIDER) {
AnnaBridge 188:bcfe06ba3d64 70 error("CTDAC clock divider allocation failed.");
AnnaBridge 188:bcfe06ba3d64 71 }
AnnaBridge 188:bcfe06ba3d64 72 Cy_SysClk_PeriphSetDivider(CY_SYSCLK_DIV_8_BIT,
AnnaBridge 188:bcfe06ba3d64 73 dac_clock_divider,
AnnaBridge 189:f392fc9709a3 74 ((cy_PeriClkFreqHz + CTDAC_BASE_CLOCK_HZ / 2) / CTDAC_BASE_CLOCK_HZ) - 1);
AnnaBridge 188:bcfe06ba3d64 75 Cy_SysClk_PeriphEnableDivider(CY_SYSCLK_DIV_8_BIT, dac_clock_divider);
AnnaBridge 188:bcfe06ba3d64 76 Cy_SysClk_PeriphAssignDivider(obj->clock, CY_SYSCLK_DIV_8_BIT, dac_clock_divider);
AnnaBridge 188:bcfe06ba3d64 77
AnnaBridge 188:bcfe06ba3d64 78 Cy_CTDAC_Init(obj->base, &ctdac_config);
AnnaBridge 188:bcfe06ba3d64 79 Cy_CTDAC_Enable(obj->base);
AnnaBridge 188:bcfe06ba3d64 80 }
AnnaBridge 188:bcfe06ba3d64 81 }
AnnaBridge 188:bcfe06ba3d64 82
AnnaBridge 188:bcfe06ba3d64 83
AnnaBridge 188:bcfe06ba3d64 84 void analogout_init(dac_t *obj, PinName pin)
AnnaBridge 188:bcfe06ba3d64 85 {
AnnaBridge 188:bcfe06ba3d64 86 uint32_t dac = 0;
AnnaBridge 188:bcfe06ba3d64 87 uint32_t dac_function = 0;
AnnaBridge 188:bcfe06ba3d64 88
AnnaBridge 188:bcfe06ba3d64 89 MBED_ASSERT(obj);
AnnaBridge 188:bcfe06ba3d64 90 MBED_ASSERT(pin != (PinName)NC);
AnnaBridge 188:bcfe06ba3d64 91
AnnaBridge 188:bcfe06ba3d64 92 dac = pinmap_peripheral(pin, PinMap_DAC);
AnnaBridge 188:bcfe06ba3d64 93 if (dac != (uint32_t)NC) {
AnnaBridge 189:f392fc9709a3 94
AnnaBridge 189:f392fc9709a3 95 if ((0 != cy_reserve_io_pin(pin)) && !ctdac_initialized) {
AnnaBridge 188:bcfe06ba3d64 96 error("ANALOG OUT pin reservation conflict.");
AnnaBridge 188:bcfe06ba3d64 97 }
AnnaBridge 189:f392fc9709a3 98
AnnaBridge 189:f392fc9709a3 99 /* Initialize object */
AnnaBridge 189:f392fc9709a3 100 obj->base = (CTDAC_Type *)CY_PERIPHERAL_BASE(dac);
AnnaBridge 188:bcfe06ba3d64 101 obj->pin = pin;
AnnaBridge 188:bcfe06ba3d64 102
AnnaBridge 189:f392fc9709a3 103 /* Configure CTDAC hardware */
AnnaBridge 188:bcfe06ba3d64 104 dac_function = pinmap_function(pin, PinMap_DAC);
AnnaBridge 188:bcfe06ba3d64 105 obj->clock = CY_PIN_CLOCK(dac_function);
AnnaBridge 188:bcfe06ba3d64 106 pin_function(pin, dac_function);
AnnaBridge 189:f392fc9709a3 107
AnnaBridge 189:f392fc9709a3 108 if (AOUT != pin) {
AnnaBridge 189:f392fc9709a3 109 const PinName directOutput = AOUT;
AnnaBridge 189:f392fc9709a3 110
AnnaBridge 189:f392fc9709a3 111 /* Connect AOUT to the AMUXA bus to drive output */
AnnaBridge 189:f392fc9709a3 112 Cy_GPIO_SetHSIOM(Cy_GPIO_PortToAddr(CY_PORT(directOutput)), CY_PIN(directOutput), HSIOM_SEL_AMUXA);
AnnaBridge 189:f392fc9709a3 113 }
AnnaBridge 189:f392fc9709a3 114
AnnaBridge 188:bcfe06ba3d64 115 ctdac_init(obj);
AnnaBridge 189:f392fc9709a3 116
AnnaBridge 188:bcfe06ba3d64 117 } else {
AnnaBridge 188:bcfe06ba3d64 118 error("ANALOG OUT pinout mismatch.");
AnnaBridge 188:bcfe06ba3d64 119 }
AnnaBridge 188:bcfe06ba3d64 120 }
AnnaBridge 188:bcfe06ba3d64 121
AnnaBridge 188:bcfe06ba3d64 122 void analogout_free(dac_t *obj)
AnnaBridge 188:bcfe06ba3d64 123 {
AnnaBridge 189:f392fc9709a3 124 /* MBED AnalogIn driver does not call this function in destructor */
AnnaBridge 188:bcfe06ba3d64 125 }
AnnaBridge 188:bcfe06ba3d64 126
AnnaBridge 188:bcfe06ba3d64 127 void analogout_write(dac_t *obj, float value)
AnnaBridge 188:bcfe06ba3d64 128 {
AnnaBridge 188:bcfe06ba3d64 129 uint32_t val = 0;
AnnaBridge 188:bcfe06ba3d64 130
AnnaBridge 188:bcfe06ba3d64 131 if (value > 1.0) {
AnnaBridge 188:bcfe06ba3d64 132 val = CTDAC_MAX_VALUE;
AnnaBridge 188:bcfe06ba3d64 133 } else if (value > 0.0) {
AnnaBridge 188:bcfe06ba3d64 134 val = value * CTDAC_MAX_VALUE;
AnnaBridge 188:bcfe06ba3d64 135 }
AnnaBridge 188:bcfe06ba3d64 136 Cy_CTDAC_SetValueBuffered(obj->base, val);
AnnaBridge 188:bcfe06ba3d64 137 }
AnnaBridge 188:bcfe06ba3d64 138
AnnaBridge 188:bcfe06ba3d64 139 void analogout_write_u16(dac_t *obj, uint16_t value)
AnnaBridge 188:bcfe06ba3d64 140 {
AnnaBridge 188:bcfe06ba3d64 141 uint32_t val = 0;
AnnaBridge 188:bcfe06ba3d64 142
AnnaBridge 188:bcfe06ba3d64 143 val = (value >> (16 - CTDAC_NUM_BITS)); // Convert from 16-bit range.
AnnaBridge 188:bcfe06ba3d64 144
AnnaBridge 188:bcfe06ba3d64 145 Cy_CTDAC_SetValueBuffered(obj->base, val);
AnnaBridge 188:bcfe06ba3d64 146 }
AnnaBridge 188:bcfe06ba3d64 147
AnnaBridge 188:bcfe06ba3d64 148 float analogout_read(dac_t *obj)
AnnaBridge 188:bcfe06ba3d64 149 {
AnnaBridge 188:bcfe06ba3d64 150 return (float)analogout_read_u16(obj) / 0xffff;
AnnaBridge 188:bcfe06ba3d64 151 }
AnnaBridge 188:bcfe06ba3d64 152
AnnaBridge 188:bcfe06ba3d64 153 uint16_t analogout_read_u16(dac_t *obj)
AnnaBridge 188:bcfe06ba3d64 154 {
AnnaBridge 188:bcfe06ba3d64 155 uint16_t value = (obj->base->CTDAC_VAL_NXT >> CTDAC_CTDAC_VAL_NXT_VALUE_Pos) & CTDAC_CTDAC_VAL_NXT_VALUE_Msk;
AnnaBridge 188:bcfe06ba3d64 156
AnnaBridge 188:bcfe06ba3d64 157 value <<= (16 - CTDAC_NUM_BITS); // Convert to 16-bit range.
AnnaBridge 188:bcfe06ba3d64 158
AnnaBridge 188:bcfe06ba3d64 159 return value;
AnnaBridge 188:bcfe06ba3d64 160 }
AnnaBridge 188:bcfe06ba3d64 161
AnnaBridge 188:bcfe06ba3d64 162 #endif // DEVICE_ANALOGIN
AnnaBridge 188:bcfe06ba3d64 163