mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_Cypress/TARGET_PSOC6/analogout_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?

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 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 "analogout_api.h"
AnnaBridge 188:bcfe06ba3d64 20 #include "cy_ctdac.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_ANALOGOUT
AnnaBridge 188:bcfe06ba3d64 29
AnnaBridge 188:bcfe06ba3d64 30 #define CTDAC_NUM_BITS 12
AnnaBridge 188:bcfe06ba3d64 31 const uint16_t CTDAC_MAX_VALUE = (uint16_t)((1UL << CTDAC_NUM_BITS) - 1);
AnnaBridge 188:bcfe06ba3d64 32
AnnaBridge 188:bcfe06ba3d64 33 const uint32_t CTDAC_BASE_CLOCK_HZ = 500000; // 500 kHz or less
AnnaBridge 188:bcfe06ba3d64 34
AnnaBridge 188:bcfe06ba3d64 35 #define CTDAC_DEGLITCH_CYCLES 35
AnnaBridge 188:bcfe06ba3d64 36
AnnaBridge 188:bcfe06ba3d64 37
AnnaBridge 188:bcfe06ba3d64 38
AnnaBridge 188:bcfe06ba3d64 39 /** Global CTDAC configuration data.
AnnaBridge 188:bcfe06ba3d64 40 */
AnnaBridge 188:bcfe06ba3d64 41 static cy_stc_ctdac_config_t ctdac_config = {
AnnaBridge 188:bcfe06ba3d64 42 .refSource = CY_CTDAC_REFSOURCE_VDDA, /**< Reference source: Vdda or externally through Opamp1 of CTB */
AnnaBridge 188:bcfe06ba3d64 43 .formatMode = CY_CTDAC_FORMAT_UNSIGNED, /**< Format of DAC value: signed or unsigned */
AnnaBridge 188:bcfe06ba3d64 44 .updateMode = CY_CTDAC_UPDATE_BUFFERED_WRITE, /**< Update mode: direct or buffered writes or hardware, edge or level */
AnnaBridge 188:bcfe06ba3d64 45 .deglitchMode = CY_CTDAC_DEGLITCHMODE_UNBUFFERED, /**< Deglitch mode: disabled, buffered, unbuffered, or both */
AnnaBridge 188:bcfe06ba3d64 46 .outputMode = CY_CTDAC_OUTPUT_VALUE, /**< Output mode: enabled (value or value + 1), high-z, Vssa, or Vdda */
AnnaBridge 188:bcfe06ba3d64 47 .outputBuffer = CY_CTDAC_OUTPUT_UNBUFFERED, /**< Output path: Buffered through Opamp0 of CTB or connected directly to Pin 6 */
AnnaBridge 188:bcfe06ba3d64 48 .deepSleep = CY_CTDAC_DEEPSLEEP_DISABLE, /**< Enable or disable the CTDAC during Deep Sleep */
AnnaBridge 188:bcfe06ba3d64 49 .deglitchCycles = CTDAC_DEGLITCH_CYCLES, /**< Number of deglitch cycles from 0 to 63 */
AnnaBridge 188:bcfe06ba3d64 50 .value = 0, /**< Current DAC value */
AnnaBridge 188:bcfe06ba3d64 51 .nextValue = 0, /**< Next DAC value for double buffering */
AnnaBridge 188:bcfe06ba3d64 52 .enableInterrupt = false, /**< If true, enable interrupt when next value register is transferred to value register */
AnnaBridge 188:bcfe06ba3d64 53 .configClock = false, /**< Configure or ignore clock information */
AnnaBridge 188:bcfe06ba3d64 54 };
AnnaBridge 188:bcfe06ba3d64 55
AnnaBridge 188:bcfe06ba3d64 56
AnnaBridge 188:bcfe06ba3d64 57 static bool ctdac_initialized = 0;
AnnaBridge 188:bcfe06ba3d64 58
AnnaBridge 188:bcfe06ba3d64 59 static void ctdac_init(dac_t *obj)
AnnaBridge 188:bcfe06ba3d64 60 {
AnnaBridge 188:bcfe06ba3d64 61 if (!ctdac_initialized) {
AnnaBridge 188:bcfe06ba3d64 62 uint32_t dac_clock_divider = CY_INVALID_DIVIDER;
AnnaBridge 188:bcfe06ba3d64 63
AnnaBridge 188:bcfe06ba3d64 64 ctdac_initialized = true;
AnnaBridge 188:bcfe06ba3d64 65 // Allocate and setup clock.
AnnaBridge 188:bcfe06ba3d64 66 dac_clock_divider = cy_clk_allocate_divider(CY_SYSCLK_DIV_8_BIT);
AnnaBridge 188:bcfe06ba3d64 67 if (dac_clock_divider == CY_INVALID_DIVIDER) {
AnnaBridge 188:bcfe06ba3d64 68 error("CTDAC clock divider allocation failed.");
AnnaBridge 188:bcfe06ba3d64 69 return;
AnnaBridge 188:bcfe06ba3d64 70 }
AnnaBridge 188:bcfe06ba3d64 71 Cy_SysClk_PeriphSetDivider(CY_SYSCLK_DIV_8_BIT,
AnnaBridge 188:bcfe06ba3d64 72 dac_clock_divider,
AnnaBridge 188:bcfe06ba3d64 73 ((CY_CLK_PERICLK_FREQ_HZ + CTDAC_BASE_CLOCK_HZ / 2) / CTDAC_BASE_CLOCK_HZ) - 1);
AnnaBridge 188:bcfe06ba3d64 74 Cy_SysClk_PeriphEnableDivider(CY_SYSCLK_DIV_8_BIT, dac_clock_divider);
AnnaBridge 188:bcfe06ba3d64 75 Cy_SysClk_PeriphAssignDivider(obj->clock, CY_SYSCLK_DIV_8_BIT, dac_clock_divider);
AnnaBridge 188:bcfe06ba3d64 76
AnnaBridge 188:bcfe06ba3d64 77 Cy_CTDAC_Init(obj->base, &ctdac_config);
AnnaBridge 188:bcfe06ba3d64 78 Cy_CTDAC_Enable(obj->base);
AnnaBridge 188:bcfe06ba3d64 79 }
AnnaBridge 188:bcfe06ba3d64 80 }
AnnaBridge 188:bcfe06ba3d64 81
AnnaBridge 188:bcfe06ba3d64 82
AnnaBridge 188:bcfe06ba3d64 83 void analogout_init(dac_t *obj, PinName pin)
AnnaBridge 188:bcfe06ba3d64 84 {
AnnaBridge 188:bcfe06ba3d64 85 uint32_t dac = 0;
AnnaBridge 188:bcfe06ba3d64 86 uint32_t dac_function = 0;
AnnaBridge 188:bcfe06ba3d64 87
AnnaBridge 188:bcfe06ba3d64 88 MBED_ASSERT(obj);
AnnaBridge 188:bcfe06ba3d64 89 MBED_ASSERT(pin != (PinName)NC);
AnnaBridge 188:bcfe06ba3d64 90
AnnaBridge 188:bcfe06ba3d64 91 dac = pinmap_peripheral(pin, PinMap_DAC);
AnnaBridge 188:bcfe06ba3d64 92 if (dac != (uint32_t)NC) {
AnnaBridge 188:bcfe06ba3d64 93 if (cy_reserve_io_pin(pin)) {
AnnaBridge 188:bcfe06ba3d64 94 error("ANALOG OUT pin reservation conflict.");
AnnaBridge 188:bcfe06ba3d64 95 }
AnnaBridge 188:bcfe06ba3d64 96 obj->base = (CTDAC_Type*)CY_PERIPHERAL_BASE(dac);
AnnaBridge 188:bcfe06ba3d64 97 obj->pin = pin;
AnnaBridge 188:bcfe06ba3d64 98
AnnaBridge 188:bcfe06ba3d64 99 // Configure clock.
AnnaBridge 188:bcfe06ba3d64 100 dac_function = pinmap_function(pin, PinMap_DAC);
AnnaBridge 188:bcfe06ba3d64 101 obj->clock = CY_PIN_CLOCK(dac_function);
AnnaBridge 188:bcfe06ba3d64 102 pin_function(pin, dac_function);
AnnaBridge 188:bcfe06ba3d64 103 ctdac_init(obj);
AnnaBridge 188:bcfe06ba3d64 104 } else {
AnnaBridge 188:bcfe06ba3d64 105 error("ANALOG OUT pinout mismatch.");
AnnaBridge 188:bcfe06ba3d64 106 }
AnnaBridge 188:bcfe06ba3d64 107 }
AnnaBridge 188:bcfe06ba3d64 108
AnnaBridge 188:bcfe06ba3d64 109 void analogout_free(dac_t *obj)
AnnaBridge 188:bcfe06ba3d64 110 {
AnnaBridge 188:bcfe06ba3d64 111 // Not supported yet.
AnnaBridge 188:bcfe06ba3d64 112 }
AnnaBridge 188:bcfe06ba3d64 113
AnnaBridge 188:bcfe06ba3d64 114 void analogout_write(dac_t *obj, float value)
AnnaBridge 188:bcfe06ba3d64 115 {
AnnaBridge 188:bcfe06ba3d64 116 uint32_t val = 0;
AnnaBridge 188:bcfe06ba3d64 117
AnnaBridge 188:bcfe06ba3d64 118 if (value > 1.0) {
AnnaBridge 188:bcfe06ba3d64 119 val = CTDAC_MAX_VALUE;
AnnaBridge 188:bcfe06ba3d64 120 } else if (value > 0.0) {
AnnaBridge 188:bcfe06ba3d64 121 val = value * CTDAC_MAX_VALUE;
AnnaBridge 188:bcfe06ba3d64 122 }
AnnaBridge 188:bcfe06ba3d64 123 Cy_CTDAC_SetValueBuffered(obj->base, val);
AnnaBridge 188:bcfe06ba3d64 124 }
AnnaBridge 188:bcfe06ba3d64 125
AnnaBridge 188:bcfe06ba3d64 126 void analogout_write_u16(dac_t *obj, uint16_t value)
AnnaBridge 188:bcfe06ba3d64 127 {
AnnaBridge 188:bcfe06ba3d64 128 uint32_t val = 0;
AnnaBridge 188:bcfe06ba3d64 129
AnnaBridge 188:bcfe06ba3d64 130 val = (value >> (16 - CTDAC_NUM_BITS)); // Convert from 16-bit range.
AnnaBridge 188:bcfe06ba3d64 131
AnnaBridge 188:bcfe06ba3d64 132 Cy_CTDAC_SetValueBuffered(obj->base, val);
AnnaBridge 188:bcfe06ba3d64 133 }
AnnaBridge 188:bcfe06ba3d64 134
AnnaBridge 188:bcfe06ba3d64 135 float analogout_read(dac_t *obj)
AnnaBridge 188:bcfe06ba3d64 136 {
AnnaBridge 188:bcfe06ba3d64 137 return (float)analogout_read_u16(obj) / 0xffff;
AnnaBridge 188:bcfe06ba3d64 138 }
AnnaBridge 188:bcfe06ba3d64 139
AnnaBridge 188:bcfe06ba3d64 140 uint16_t analogout_read_u16(dac_t *obj)
AnnaBridge 188:bcfe06ba3d64 141 {
AnnaBridge 188:bcfe06ba3d64 142 uint16_t value = (obj->base->CTDAC_VAL_NXT >> CTDAC_CTDAC_VAL_NXT_VALUE_Pos) & CTDAC_CTDAC_VAL_NXT_VALUE_Msk;
AnnaBridge 188:bcfe06ba3d64 143
AnnaBridge 188:bcfe06ba3d64 144 value <<= (16 - CTDAC_NUM_BITS); // Convert to 16-bit range.
AnnaBridge 188:bcfe06ba3d64 145
AnnaBridge 188:bcfe06ba3d64 146 return value;
AnnaBridge 188:bcfe06ba3d64 147 }
AnnaBridge 188:bcfe06ba3d64 148
AnnaBridge 188:bcfe06ba3d64 149 #endif // DEVICE_ANALOGIN
AnnaBridge 188:bcfe06ba3d64 150