Morpheus / target-freescale-ksdk

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of target-freescale-ksdk by -deleted-

analogin_api.c@0:e4d670b91a9a, 2016-03-23 (annotated)

Committer:
screamer
Date:
Wed Mar 23 21:26:50 2016 +0000
Revision:
0:e4d670b91a9a
Initial revision

Who changed what in which revision?

UserRevisionLine numberNew contents of line
screamer 0:e4d670b91a9a 1 /* mbed Microcontroller Library
screamer 0:e4d670b91a9a 2 * Copyright (c) 2006-2013 ARM Limited
screamer 0:e4d670b91a9a 3 *
screamer 0:e4d670b91a9a 4 * Licensed under the Apache License, Version 2.0 (the "License");
screamer 0:e4d670b91a9a 5 * you may not use this file except in compliance with the License.
screamer 0:e4d670b91a9a 6 * You may obtain a copy of the License at
screamer 0:e4d670b91a9a 7 *
screamer 0:e4d670b91a9a 8 * http://www.apache.org/licenses/LICENSE-2.0
screamer 0:e4d670b91a9a 9 *
screamer 0:e4d670b91a9a 10 * Unless required by applicable law or agreed to in writing, software
screamer 0:e4d670b91a9a 11 * distributed under the License is distributed on an "AS IS" BASIS,
screamer 0:e4d670b91a9a 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
screamer 0:e4d670b91a9a 13 * See the License for the specific language governing permissions and
screamer 0:e4d670b91a9a 14 * limitations under the License.
screamer 0:e4d670b91a9a 15 */
screamer 0:e4d670b91a9a 16 #include "mbed_assert.h"
screamer 0:e4d670b91a9a 17 #include "analogin_api.h"
screamer 0:e4d670b91a9a 18
screamer 0:e4d670b91a9a 19 #if DEVICE_ANALOGIN
screamer 0:e4d670b91a9a 20
screamer 0:e4d670b91a9a 21 #include "cmsis.h"
screamer 0:e4d670b91a9a 22 #include "pinmap.h"
screamer 0:e4d670b91a9a 23 #include "PeripheralNames.h"
screamer 0:e4d670b91a9a 24 #include "fsl_adc_hal.h"
screamer 0:e4d670b91a9a 25 #include "fsl_clock_manager.h"
screamer 0:e4d670b91a9a 26 #include "PeripheralPins.h"
screamer 0:e4d670b91a9a 27 #include "fsl_device_registers.h"
screamer 0:e4d670b91a9a 28
screamer 0:e4d670b91a9a 29 #define MAX_FADC 6000000
screamer 0:e4d670b91a9a 30
screamer 0:e4d670b91a9a 31 void analogin_init(analogin_t *obj, PinName pin) {
screamer 0:e4d670b91a9a 32 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
screamer 0:e4d670b91a9a 33 MBED_ASSERT(obj->adc != (ADCName)NC);
screamer 0:e4d670b91a9a 34
screamer 0:e4d670b91a9a 35 uint32_t instance = obj->adc >> ADC_INSTANCE_SHIFT;
screamer 0:e4d670b91a9a 36 uint32_t adc_addrs[] = ADC_BASE_ADDRS;
screamer 0:e4d670b91a9a 37
screamer 0:e4d670b91a9a 38 CLOCK_SYS_EnableAdcClock(instance);
screamer 0:e4d670b91a9a 39
screamer 0:e4d670b91a9a 40 uint32_t bus_clock;
screamer 0:e4d670b91a9a 41 CLOCK_SYS_GetFreq(kBusClock, &bus_clock);
screamer 0:e4d670b91a9a 42 uint32_t clkdiv;
screamer 0:e4d670b91a9a 43 for (clkdiv = 0; clkdiv < 4; clkdiv++) {
screamer 0:e4d670b91a9a 44 if ((bus_clock >> clkdiv) <= MAX_FADC)
screamer 0:e4d670b91a9a 45 break;
screamer 0:e4d670b91a9a 46 }
screamer 0:e4d670b91a9a 47 if (clkdiv == 4) {
screamer 0:e4d670b91a9a 48 clkdiv = 0x3; //Set max div
screamer 0:e4d670b91a9a 49 }
screamer 0:e4d670b91a9a 50 /* adc is enabled/triggered when reading. */
screamer 0:e4d670b91a9a 51 ADC_HAL_Init(adc_addrs[instance]);
screamer 0:e4d670b91a9a 52 ADC_HAL_SetClkSrcMode(adc_addrs[instance], kAdcClkSrcOfBusClk);
screamer 0:e4d670b91a9a 53 ADC_HAL_SetClkDividerMode(adc_addrs[instance], (adc_clk_divider_mode_t)(clkdiv & 0x3));
screamer 0:e4d670b91a9a 54 ADC_HAL_SetRefVoltSrcMode(adc_addrs[instance], kAdcRefVoltSrcOfVref);
screamer 0:e4d670b91a9a 55 ADC_HAL_SetResolutionMode(adc_addrs[instance], kAdcResolutionBitOfSingleEndAs16);
screamer 0:e4d670b91a9a 56 ADC_HAL_SetContinuousConvCmd(adc_addrs[instance], false);
screamer 0:e4d670b91a9a 57 ADC_HAL_SetHwTriggerCmd(adc_addrs[instance], false); /* sw trigger */
screamer 0:e4d670b91a9a 58 ADC_HAL_SetHwAverageCmd(adc_addrs[instance], true);
screamer 0:e4d670b91a9a 59 ADC_HAL_SetHwAverageMode(adc_addrs[instance], kAdcHwAverageCountOf4);
screamer 0:e4d670b91a9a 60 ADC_HAL_SetChnMuxMode(adc_addrs[instance],
screamer 0:e4d670b91a9a 61 obj->adc & (1 << ADC_B_CHANNEL_SHIFT) ? kAdcChnMuxOfB : kAdcChnMuxOfA);
screamer 0:e4d670b91a9a 62
screamer 0:e4d670b91a9a 63 pinmap_pinout(pin, PinMap_ADC);
screamer 0:e4d670b91a9a 64 }
screamer 0:e4d670b91a9a 65
screamer 0:e4d670b91a9a 66 uint16_t analogin_read_u16(analogin_t *obj) {
screamer 0:e4d670b91a9a 67 uint32_t instance = obj->adc >> ADC_INSTANCE_SHIFT;
screamer 0:e4d670b91a9a 68 uint32_t adc_addrs[] = ADC_BASE_ADDRS;
screamer 0:e4d670b91a9a 69 /* sw trigger (SC1A) */
screamer 0:e4d670b91a9a 70 ADC_HAL_ConfigChn(adc_addrs[instance], 0, false, false, obj->adc & 0xF);
screamer 0:e4d670b91a9a 71 while (!ADC_HAL_GetChnConvCompletedCmd(adc_addrs[instance], 0));
screamer 0:e4d670b91a9a 72 return ADC_HAL_GetChnConvValueRAW(adc_addrs[instance], 0);
screamer 0:e4d670b91a9a 73 }
screamer 0:e4d670b91a9a 74
screamer 0:e4d670b91a9a 75 float analogin_read(analogin_t *obj) {
screamer 0:e4d670b91a9a 76 uint16_t value = analogin_read_u16(obj);
screamer 0:e4d670b91a9a 77 return (float)value * (1.0f / (float)0xFFFF);
screamer 0:e4d670b91a9a 78 }
screamer 0:e4d670b91a9a 79
screamer 0:e4d670b91a9a 80 #endif