ON Semiconductor / mbed-os

5.2.1 - Updated I2C files

Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

targets/TARGET_NXP/TARGET_LPC408X/analogout_api.c@1:f30bdcd2b33b, 2017-02-27 (annotated)

Committer:
jacobjohnson
Date:
Mon Feb 27 17:45:05 2017 +0000
Revision:
1:f30bdcd2b33b
Parent:
0:098463de4c5d 
changed the inputscale from 1 to 7 in analogin_api.c.  This will need to be changed later, and accessed from the main level, but for now this allows the  adc to read a value from 0 to 3.7V, instead of just up to 1V.;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /* mbed Microcontroller Library
group-onsemi 0:098463de4c5d 2 * Copyright (c) 2006-2013 ARM Limited
group-onsemi 0:098463de4c5d 3 *
group-onsemi 0:098463de4c5d 4 * Licensed under the Apache License, Version 2.0 (the "License");
group-onsemi 0:098463de4c5d 5 * you may not use this file except in compliance with the License.
group-onsemi 0:098463de4c5d 6 * You may obtain a copy of the License at
group-onsemi 0:098463de4c5d 7 *
group-onsemi 0:098463de4c5d 8 * http://www.apache.org/licenses/LICENSE-2.0
group-onsemi 0:098463de4c5d 9 *
group-onsemi 0:098463de4c5d 10 * Unless required by applicable law or agreed to in writing, software
group-onsemi 0:098463de4c5d 11 * distributed under the License is distributed on an "AS IS" BASIS,
group-onsemi 0:098463de4c5d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
group-onsemi 0:098463de4c5d 13 * See the License for the specific language governing permissions and
group-onsemi 0:098463de4c5d 14 * limitations under the License.
group-onsemi 0:098463de4c5d 15 */
group-onsemi 0:098463de4c5d 16 #include "mbed_assert.h"
group-onsemi 0:098463de4c5d 17 #include "analogout_api.h"
group-onsemi 0:098463de4c5d 18 #include "cmsis.h"
group-onsemi 0:098463de4c5d 19 #include "pinmap.h"
group-onsemi 0:098463de4c5d 20
group-onsemi 0:098463de4c5d 21 static const PinMap PinMap_DAC[] = {
group-onsemi 0:098463de4c5d 22 {P0_26, DAC_0, 2},
group-onsemi 0:098463de4c5d 23 {NC , NC , 0}
group-onsemi 0:098463de4c5d 24 };
group-onsemi 0:098463de4c5d 25
group-onsemi 0:098463de4c5d 26 void analogout_init(dac_t *obj, PinName pin) {
group-onsemi 0:098463de4c5d 27 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
group-onsemi 0:098463de4c5d 28 MBED_ASSERT(obj->dac != (DACName)NC);
group-onsemi 0:098463de4c5d 29
group-onsemi 0:098463de4c5d 30 // DAC enable bit must be set
group-onsemi 0:098463de4c5d 31 LPC_IOCON->P0_26 |= (1 << 16); // DACEN
group-onsemi 0:098463de4c5d 32
group-onsemi 0:098463de4c5d 33 // map out (must be done before accessing registers)
group-onsemi 0:098463de4c5d 34 pinmap_pinout(pin, PinMap_DAC);
group-onsemi 0:098463de4c5d 35
group-onsemi 0:098463de4c5d 36 analogout_write_u16(obj, 0);
group-onsemi 0:098463de4c5d 37 }
group-onsemi 0:098463de4c5d 38
group-onsemi 0:098463de4c5d 39 void analogout_free(dac_t *obj) {}
group-onsemi 0:098463de4c5d 40
group-onsemi 0:098463de4c5d 41 static inline void dac_write(int value) {
group-onsemi 0:098463de4c5d 42 value &= 0x3FF; // 10-bit
group-onsemi 0:098463de4c5d 43
group-onsemi 0:098463de4c5d 44 // Set the DAC output
group-onsemi 0:098463de4c5d 45 LPC_DAC->CR = (0 << 16) // bias = 0
group-onsemi 0:098463de4c5d 46 | (value << 6);
group-onsemi 0:098463de4c5d 47 }
group-onsemi 0:098463de4c5d 48
group-onsemi 0:098463de4c5d 49 static inline int dac_read() {
group-onsemi 0:098463de4c5d 50 return (LPC_DAC->CR >> 6) & 0x3FF;
group-onsemi 0:098463de4c5d 51 }
group-onsemi 0:098463de4c5d 52
group-onsemi 0:098463de4c5d 53 void analogout_write(dac_t *obj, float value) {
group-onsemi 0:098463de4c5d 54 if (value < 0.0f) {
group-onsemi 0:098463de4c5d 55 dac_write(0);
group-onsemi 0:098463de4c5d 56 } else if (value > 1.0f) {
group-onsemi 0:098463de4c5d 57 dac_write(0x3FF);
group-onsemi 0:098463de4c5d 58 } else {
group-onsemi 0:098463de4c5d 59 dac_write(value * (float)0x3FF);
group-onsemi 0:098463de4c5d 60 }
group-onsemi 0:098463de4c5d 61 }
group-onsemi 0:098463de4c5d 62
group-onsemi 0:098463de4c5d 63 void analogout_write_u16(dac_t *obj, uint16_t value) {
group-onsemi 0:098463de4c5d 64 dac_write(value >> 6); // 10-bit
group-onsemi 0:098463de4c5d 65 }
group-onsemi 0:098463de4c5d 66
group-onsemi 0:098463de4c5d 67 float analogout_read(dac_t *obj) {
group-onsemi 0:098463de4c5d 68 uint32_t value = dac_read();
group-onsemi 0:098463de4c5d 69 return (float)value * (1.0f / (float)0x3FF);
group-onsemi 0:098463de4c5d 70 }
group-onsemi 0:098463de4c5d 71
group-onsemi 0:098463de4c5d 72 uint16_t analogout_read_u16(dac_t *obj) {
group-onsemi 0:098463de4c5d 73 uint32_t value = dac_read(); // 10-bit
group-onsemi 0:098463de4c5d 74 return (value << 6) | ((value >> 4) & 0x003F);
group-onsemi 0:098463de4c5d 75 }