TEAMUSB / mbed-src

mbed library sources

Dependents:   SPI_slave_frdm

Fork of mbed-src by mbed official

targets/hal/TARGET_Freescale/TARGET_K20XX/analogout_api.c@445:3312ed629f01, 2015-01-15 (annotated)

Committer:
mbed_official
Date:
Thu Jan 15 19:30:07 2015 +0000
Revision:
445:3312ed629f01
Synchronized with git revision e21c65041d9a718f866ed6438e5791b13f9c6d91



Full URL: https://github.com/mbedmicro/mbed/commit/e21c65041d9a718f866ed6438e5791b13f9c6d91/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 445:3312ed629f01 1 /* mbed Microcontroller Library
mbed_official 445:3312ed629f01 2 * Copyright (c) 2006-2015 ARM Limited
mbed_official 445:3312ed629f01 3 *
mbed_official 445:3312ed629f01 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 445:3312ed629f01 5 * you may not use this file except in compliance with the License.
mbed_official 445:3312ed629f01 6 * You may obtain a copy of the License at
mbed_official 445:3312ed629f01 7 *
mbed_official 445:3312ed629f01 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 445:3312ed629f01 9 *
mbed_official 445:3312ed629f01 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 445:3312ed629f01 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 445:3312ed629f01 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 445:3312ed629f01 13 * See the License for the specific language governing permissions and
mbed_official 445:3312ed629f01 14 * limitations under the License.
mbed_official 445:3312ed629f01 15 */
mbed_official 445:3312ed629f01 16
mbed_official 445:3312ed629f01 17 #include "mbed_assert.h"
mbed_official 445:3312ed629f01 18 #include "analogout_api.h"
mbed_official 445:3312ed629f01 19
mbed_official 445:3312ed629f01 20 #if DEVICE_ANALOGOUT
mbed_official 445:3312ed629f01 21
mbed_official 445:3312ed629f01 22 #include "cmsis.h"
mbed_official 445:3312ed629f01 23 #include "pinmap.h"
mbed_official 445:3312ed629f01 24 #include "PeripheralPins.h"
mbed_official 445:3312ed629f01 25
mbed_official 445:3312ed629f01 26 #define RANGE_12BIT 0xFFF
mbed_official 445:3312ed629f01 27
mbed_official 445:3312ed629f01 28 void analogout_init(dac_t *obj, PinName pin) {
mbed_official 445:3312ed629f01 29 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
mbed_official 445:3312ed629f01 30 MBED_ASSERT(obj->dac != (DACName)NC);
mbed_official 445:3312ed629f01 31
mbed_official 445:3312ed629f01 32 SIM->SCGC2 |= SIM_SCGC2_DAC0_MASK;
mbed_official 445:3312ed629f01 33
mbed_official 445:3312ed629f01 34 uint32_t port = (uint32_t)pin >> PORT_SHIFT;
mbed_official 445:3312ed629f01 35 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
mbed_official 445:3312ed629f01 36
mbed_official 445:3312ed629f01 37 DAC0->DAT[obj->dac].DATH = 0;
mbed_official 445:3312ed629f01 38 DAC0->DAT[obj->dac].DATL = 0;
mbed_official 445:3312ed629f01 39
mbed_official 445:3312ed629f01 40 DAC0->C1 = DAC_C1_DACBFMD_MASK; // One-Time Scan Mode
mbed_official 445:3312ed629f01 41
mbed_official 445:3312ed629f01 42 DAC0->C0 = DAC_C0_DACEN_MASK // Enable
mbed_official 445:3312ed629f01 43 | DAC_C0_DACSWTRG_MASK // Software Trigger
mbed_official 445:3312ed629f01 44 | DAC_C0_DACRFS_MASK; // VDDA selected
mbed_official 445:3312ed629f01 45
mbed_official 445:3312ed629f01 46 analogout_write_u16(obj, 0);
mbed_official 445:3312ed629f01 47 }
mbed_official 445:3312ed629f01 48
mbed_official 445:3312ed629f01 49 void analogout_free(dac_t *obj) {}
mbed_official 445:3312ed629f01 50
mbed_official 445:3312ed629f01 51 static inline void dac_write(dac_t *obj, int value) {
mbed_official 445:3312ed629f01 52 DAC0->DAT[obj->dac].DATL = (uint8_t)( value & 0xFF);
mbed_official 445:3312ed629f01 53 DAC0->DAT[obj->dac].DATH = (uint8_t)((value >> 8) & 0xFF);
mbed_official 445:3312ed629f01 54 }
mbed_official 445:3312ed629f01 55
mbed_official 445:3312ed629f01 56 static inline int dac_read(dac_t *obj) {
mbed_official 445:3312ed629f01 57 return ((DAC0->DAT[obj->dac].DATH << 8) | DAC0->DAT[obj->dac].DATL);
mbed_official 445:3312ed629f01 58 }
mbed_official 445:3312ed629f01 59
mbed_official 445:3312ed629f01 60 void analogout_write(dac_t *obj, float value) {
mbed_official 445:3312ed629f01 61 if (value < 0.0) {
mbed_official 445:3312ed629f01 62 dac_write(obj, 0);
mbed_official 445:3312ed629f01 63 } else if (value > 1.0) {
mbed_official 445:3312ed629f01 64 dac_write(obj, RANGE_12BIT);
mbed_official 445:3312ed629f01 65 } else {
mbed_official 445:3312ed629f01 66 dac_write(obj, value * (float)RANGE_12BIT);
mbed_official 445:3312ed629f01 67 }
mbed_official 445:3312ed629f01 68 }
mbed_official 445:3312ed629f01 69
mbed_official 445:3312ed629f01 70 void analogout_write_u16(dac_t *obj, uint16_t value) {
mbed_official 445:3312ed629f01 71 dac_write(obj, value >> 4); // 12-bit
mbed_official 445:3312ed629f01 72 }
mbed_official 445:3312ed629f01 73
mbed_official 445:3312ed629f01 74 float analogout_read(dac_t *obj) {
mbed_official 445:3312ed629f01 75 uint32_t value = dac_read(obj);
mbed_official 445:3312ed629f01 76 return (float)value * (1.0f / (float)RANGE_12BIT);
mbed_official 445:3312ed629f01 77 }
mbed_official 445:3312ed629f01 78
mbed_official 445:3312ed629f01 79 uint16_t analogout_read_u16(dac_t *obj) {
mbed_official 445:3312ed629f01 80 uint32_t value = dac_read(obj); // 12-bit
mbed_official 445:3312ed629f01 81 return (value << 4) | ((value >> 8) & 0x003F);
mbed_official 445:3312ed629f01 82 }
mbed_official 445:3312ed629f01 83
mbed_official 445:3312ed629f01 84 #endif