mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
Diff: targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/analogin_api.c
- Revision:
- 320:be04b2b1e3f2
- Parent:
- 267:8673334f2cbe
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/analogin_api.c Thu Sep 11 17:00:08 2014 +0100 @@ -0,0 +1,75 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 ARM Limited + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include "mbed_assert.h" +#include "analogin_api.h" + +#if DEVICE_ANALOGIN + +#include "cmsis.h" +#include "pinmap.h" +#include "PeripheralNames.h" +#include "fsl_adc_hal.h" +#include "fsl_clock_manager.h" +#include "PeripheralPins.h" + +#define MAX_FADC 6000000 + +void analogin_init(analogin_t *obj, PinName pin) { + obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); + MBED_ASSERT(obj->adc != (ADCName)NC); + + uint32_t instance = obj->adc >> ADC_INSTANCE_SHIFT; + + clock_manager_set_gate(kClockModuleADC, instance, true); + + uint32_t bus_clock; + clock_manager_get_frequency(kBusClock, &bus_clock); + uint32_t clkdiv; + for (clkdiv = 0; clkdiv < 4; clkdiv++) { + if ((bus_clock >> clkdiv) <= MAX_FADC) + break; + } + if (clkdiv == 4) { + clkdiv = 0x7; //Set max div + } + /* adc is enabled/triggered when reading. */ + adc_hal_set_clock_source_mode(instance, (adc_clock_source_mode_t)(clkdiv >> 2)); + adc_hal_set_clock_divider_mode(instance, (adc_clock_divider_mode_t)(clkdiv & 0x3)); + adc_hal_set_reference_voltage_mode(instance, kAdcVoltageVref); + adc_hal_set_resolution_mode(instance, kAdcSingleDiff16); + adc_hal_configure_continuous_conversion(instance, false); + adc_hal_configure_hw_trigger(instance, false); /* sw trigger */ + adc_hal_configure_hw_average(instance, true); + adc_hal_set_hw_average_mode(instance, kAdcHwAverageCount4); + adc_hal_set_group_mux(instance, kAdcChannelMuxB); /* only B channels are avail */ + + pinmap_pinout(pin, PinMap_ADC); +} + +uint16_t analogin_read_u16(analogin_t *obj) { + uint32_t instance = obj->adc >> ADC_INSTANCE_SHIFT; + /* sw trigger (SC1A) */ + adc_hal_enable(instance, 0, (adc_channel_mode_t)(obj->adc & 0xF), false); + while (!adc_hal_is_conversion_completed(instance, 0)); + return adc_hal_get_conversion_value(instance, 0); +} + +float analogin_read(analogin_t *obj) { + uint16_t value = analogin_read_u16(obj); + return (float)value * (1.0f / (float)0xFFFF); +} + +#endif