tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/analogout_api.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #include "analogout_api.h"
  17
  18 #if DEVICE_ANALOGOUT
  19
  20 #include "cmsis.h"
  21 #include "pinmap.h"
  22 #include "mbed_error.h"
  23 #include "PeripheralPins.h"
  24 #include "fsl_clock_manager.h"
  25
  26 #define RANGE_12BIT     0xFFF
  27
  28 void analogout_init(dac_t *obj, PinName pin) {
  29     obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
  30     if (obj->dac == (DACName)NC) {
  31         error("DAC pin mapping failed");
  32     }
  33
  34     SIM_HAL_EnableDacClock(SIM_BASE, 0);
  35
  36     DAC0->DAT[obj->dac].DATH = 0;
  37     DAC0->DAT[obj->dac].DATL = 0;
  38
  39     DAC0->C1 = DAC_C1_DACBFMD(2);     // One-Time Scan Mode
  40
  41     DAC0->C0 = DAC_C0_DACEN_MASK      // Enable
  42              | DAC_C0_DACSWTRG_MASK   // Software Trigger
  43              | DAC_C0_DACRFS_MASK;    // VDDA selected
  44
  45     analogout_write_u16(obj, 0);
  46 }
  47
  48 void analogout_free(dac_t *obj) {}
  49
  50 static inline void dac_write(dac_t *obj, int value) {
  51     DAC0->DAT[obj->dac].DATL = (uint8_t)( value       & 0xFF);
  52     DAC0->DAT[obj->dac].DATH = (uint8_t)((value >> 8) & 0xFF);
  53 }
  54
  55 static inline int dac_read(dac_t *obj) {
  56     return ((DAC0->DAT[obj->dac].DATH << 8) | DAC0->DAT[obj->dac].DATL);
  57 }
  58
  59 void analogout_write(dac_t *obj, float value) {
  60     if (value < 0.0f) {
  61         dac_write(obj, 0);
  62     } else if (value > 1.0f) {
  63         dac_write(obj, RANGE_12BIT);
  64     } else {
  65         dac_write(obj, value * (float)RANGE_12BIT);
  66     }
  67 }
  68
  69 void analogout_write_u16(dac_t *obj, uint16_t value) {
  70     dac_write(obj, value >> 4); // 12-bit
  71 }
  72
  73 float analogout_read(dac_t *obj) {
  74     uint32_t value = dac_read(obj);
  75     return (float)value * (1.0f / (float)RANGE_12BIT);
  76 }
  77
  78 uint16_t analogout_read_u16(dac_t *obj) {
  79     uint32_t value = dac_read(obj); // 12-bit
  80     return (value << 4) | ((value >> 8) & 0x003F);
  81 }
  82
  83 #endif