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targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/api/analogin_api.c@121:7f86b4238bec, 2016-05-03 (annotated)

Committer:
mbed_official
Date:
Tue May 03 00:15:16 2016 +0100
Revision:
121:7f86b4238bec
Child:
144:ef7eb2e8f9f7
Synchronized with git revision 9cef243de23875778f461bbe9a8c1bc47e65212b



Full URL: https://github.com/mbedmicro/mbed/commit/9cef243de23875778f461bbe9a8c1bc47e65212b/



Switch to KSDK 2.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 121:7f86b4238bec 1 /* mbed Microcontroller Library
mbed_official 121:7f86b4238bec 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 121:7f86b4238bec 3 *
mbed_official 121:7f86b4238bec 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 121:7f86b4238bec 5 * you may not use this file except in compliance with the License.
mbed_official 121:7f86b4238bec 6 * You may obtain a copy of the License at
mbed_official 121:7f86b4238bec 7 *
mbed_official 121:7f86b4238bec 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 121:7f86b4238bec 9 *
mbed_official 121:7f86b4238bec 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 121:7f86b4238bec 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 121:7f86b4238bec 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 121:7f86b4238bec 13 * See the License for the specific language governing permissions and
mbed_official 121:7f86b4238bec 14 * limitations under the License.
mbed_official 121:7f86b4238bec 15 */
mbed_official 121:7f86b4238bec 16 #include "mbed_assert.h"
mbed_official 121:7f86b4238bec 17 #include "analogin_api.h"
mbed_official 121:7f86b4238bec 18
mbed_official 121:7f86b4238bec 19 #if DEVICE_ANALOGIN
mbed_official 121:7f86b4238bec 20
mbed_official 121:7f86b4238bec 21 #include "cmsis.h"
mbed_official 121:7f86b4238bec 22 #include "pinmap.h"
mbed_official 121:7f86b4238bec 23 #include "PeripheralNames.h"
mbed_official 121:7f86b4238bec 24 #include "fsl_adc16.h"
mbed_official 121:7f86b4238bec 25 #include "PeripheralPins.h"
mbed_official 121:7f86b4238bec 26
mbed_official 121:7f86b4238bec 27 /* Array of ADC peripheral base address. */
mbed_official 121:7f86b4238bec 28 static ADC_Type *const adc_addrs[] = ADC_BASE_PTRS;
mbed_official 121:7f86b4238bec 29
mbed_official 121:7f86b4238bec 30 #define MAX_FADC 6000000
mbed_official 121:7f86b4238bec 31
mbed_official 121:7f86b4238bec 32 void analogin_init(analogin_t *obj, PinName pin) {
mbed_official 121:7f86b4238bec 33 obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
mbed_official 121:7f86b4238bec 34 MBED_ASSERT(obj->adc != (ADCName)NC);
mbed_official 121:7f86b4238bec 35
mbed_official 121:7f86b4238bec 36 uint32_t instance = obj->adc >> ADC_INSTANCE_SHIFT;
mbed_official 121:7f86b4238bec 37 uint32_t bus_clock;
mbed_official 121:7f86b4238bec 38 adc16_config_t adc16_config;
mbed_official 121:7f86b4238bec 39
mbed_official 121:7f86b4238bec 40 bus_clock = CLOCK_GetFreq(kCLOCK_BusClk);
mbed_official 121:7f86b4238bec 41 uint32_t clkdiv;
mbed_official 121:7f86b4238bec 42 for (clkdiv = 0; clkdiv < 4; clkdiv++) {
mbed_official 121:7f86b4238bec 43 if ((bus_clock >> clkdiv) <= MAX_FADC)
mbed_official 121:7f86b4238bec 44 break;
mbed_official 121:7f86b4238bec 45 }
mbed_official 121:7f86b4238bec 46 if (clkdiv == 4) {
mbed_official 121:7f86b4238bec 47 clkdiv = 0x3; //Set max div
mbed_official 121:7f86b4238bec 48 }
mbed_official 121:7f86b4238bec 49
mbed_official 121:7f86b4238bec 50 ADC16_GetDefaultConfig(&adc16_config);
mbed_official 121:7f86b4238bec 51 adc16_config.clockSource = kADC16_ClockSourceAlt0;
mbed_official 121:7f86b4238bec 52 adc16_config.clockDivider = (adc16_clock_divider_t)clkdiv;
mbed_official 121:7f86b4238bec 53 adc16_config.resolution = kADC16_ResolutionSE16Bit;
mbed_official 121:7f86b4238bec 54 ADC16_Init(adc_addrs[instance], &adc16_config);
mbed_official 121:7f86b4238bec 55 ADC16_EnableHardwareTrigger(adc_addrs[instance], false);
mbed_official 121:7f86b4238bec 56 ADC16_SetHardwareAverage(adc_addrs[instance], kADC16_HardwareAverageCount4);
mbed_official 121:7f86b4238bec 57 ADC16_SetChannelMuxMode(adc_addrs[instance],
mbed_official 121:7f86b4238bec 58 obj->adc & (1 << ADC_B_CHANNEL_SHIFT) ? kADC16_ChannelMuxB : kADC16_ChannelMuxA);
mbed_official 121:7f86b4238bec 59
mbed_official 121:7f86b4238bec 60 pinmap_pinout(pin, PinMap_ADC);
mbed_official 121:7f86b4238bec 61 }
mbed_official 121:7f86b4238bec 62
mbed_official 121:7f86b4238bec 63 uint16_t analogin_read_u16(analogin_t *obj) {
mbed_official 121:7f86b4238bec 64 uint32_t instance = obj->adc >> ADC_INSTANCE_SHIFT;
mbed_official 121:7f86b4238bec 65 adc16_channel_config_t adc16_channel_config;
mbed_official 121:7f86b4238bec 66
mbed_official 121:7f86b4238bec 67 adc16_channel_config.channelNumber = obj->adc & 0xF;
mbed_official 121:7f86b4238bec 68 adc16_channel_config.enableInterruptOnConversionCompleted = false;
mbed_official 121:7f86b4238bec 69 /*
mbed_official 121:7f86b4238bec 70 * When in software trigger mode, each conversion would be launched once calling the "ADC16_ChannelConfigure()"
mbed_official 121:7f86b4238bec 71 * function, which works like writing a conversion command and executing it.
mbed_official 121:7f86b4238bec 72 */
mbed_official 121:7f86b4238bec 73 ADC16_SetChannelConfig(adc_addrs[instance], 0, &adc16_channel_config);
mbed_official 121:7f86b4238bec 74 while (0U == (kADC16_ChannelConversionDoneFlag &
mbed_official 121:7f86b4238bec 75 ADC16_GetChannelStatusFlags(adc_addrs[instance], 0)))
mbed_official 121:7f86b4238bec 76 {
mbed_official 121:7f86b4238bec 77 }
mbed_official 121:7f86b4238bec 78 return ADC16_GetChannelConversionValue(adc_addrs[instance], 0);
mbed_official 121:7f86b4238bec 79 }
mbed_official 121:7f86b4238bec 80
mbed_official 121:7f86b4238bec 81 float analogin_read(analogin_t *obj) {
mbed_official 121:7f86b4238bec 82 uint16_t value = analogin_read_u16(obj);
mbed_official 121:7f86b4238bec 83 return (float)value * (1.0f / (float)0xFFFF);
mbed_official 121:7f86b4238bec 84 }
mbed_official 121:7f86b4238bec 85
mbed_official 121:7f86b4238bec 86 #endif