213 lines
6.9 KiB
C
213 lines
6.9 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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* Copyright (c) 2015 Daniel Campora
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "py/mpconfig.h"
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#include MICROPY_HAL_H
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "py/binary.h"
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#include "py/gc.h"
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#include "bufhelper.h"
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#include "inc/hw_types.h"
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#include "inc/hw_adc.h"
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#include "inc/hw_ints.h"
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#include "inc/hw_memmap.h"
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#include "rom_map.h"
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#include "interrupt.h"
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#include "pin.h"
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#include "gpio.h"
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#include "prcm.h"
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#include "adc.h"
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#include "pybadc.h"
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#include "pybpin.h"
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#include "pybsleep.h"
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#include "pins.h"
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#include "mpexception.h"
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/// \moduleref pyb
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/// \class ADC - analog to digital conversion: read analog values on a pin
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///
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/// Usage:
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///
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/// adc = pyb.ADC(channel) # create an adc object on the given channel (0 to 3)
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/// this automatically configures the pin associated to
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/// that analog channel.
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/// adc.read() # read channel value
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///
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/// The sample rate is fixed to 62.5KHz and the resolution to 12 bits.
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/******************************************************************************
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DECLARE CONSTANTS
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******************************************************************************/
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#define PYB_ADC_NUM_CHANNELS 4
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/******************************************************************************
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DEFINE TYPES
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******************************************************************************/
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typedef struct {
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mp_obj_base_t base;
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byte channel;
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byte num;
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} pyb_adc_obj_t;
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/******************************************************************************
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DEFINE PUBLIC FUNCTIONS
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******************************************************************************/
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STATIC void pybadc_init (pyb_adc_obj_t *self) {
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// enable the ADC channel
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MAP_ADCChannelEnable(ADC_BASE, self->channel);
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// enable and configure the timer
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MAP_ADCTimerConfig(ADC_BASE, (1 << 17) - 1);
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MAP_ADCTimerEnable(ADC_BASE);
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// enable the ADC peripheral
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MAP_ADCEnable(ADC_BASE);
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}
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/******************************************************************************
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DECLARE PRIVATE DATA
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******************************************************************************/
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STATIC pyb_adc_obj_t pyb_adc_obj[PYB_ADC_NUM_CHANNELS];
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/******************************************************************************/
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/* Micro Python bindings : adc object */
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STATIC void adc_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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pyb_adc_obj_t *self = self_in;
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mp_printf(print, "<ADC, channel=%u>", self->num);
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}
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/// \classmethod \constructor(channel)
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/// Create an ADC object associated with the given channel.
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/// This allows you to then read analog values on that pin.
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STATIC mp_obj_t adc_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
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// check number of arguments
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mp_arg_check_num(n_args, n_kw, 1, 1, false);
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// the first argument is the channel number
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uint num = mp_obj_get_int(args[0]);
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const pin_obj_t *pin;
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uint channel;
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switch (num) {
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case 0:
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channel = ADC_CH_0;
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pin = &pin_GPIO2;
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break;
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case 1:
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channel = ADC_CH_1;
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pin = &pin_GPIO3;
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break;
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case 2:
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channel = ADC_CH_2;
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pin = &pin_GPIO4;
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break;
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case 3:
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channel = ADC_CH_3;
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pin = &pin_GPIO5;
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break;
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default:
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments));
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break;
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}
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// disable the callback before re-configuring
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pyb_adc_obj_t *self = &pyb_adc_obj[channel];
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self->base.type = &pyb_adc_type;
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self->channel = channel;
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self->num = num;
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// configure the pin in analog mode
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pin_config ((pin_obj_t *)pin, PIN_MODE_0, GPIO_DIR_MODE_IN, PYBPIN_ANALOG_TYPE, PIN_STRENGTH_2MA);
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// initialize it
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pybadc_init (self);
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// register it with the sleep module
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pybsleep_add ((const mp_obj_t)self, (WakeUpCB_t)pybadc_init);
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return self;
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}
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/// \method read()
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/// Read the value on the analog pin and return it. The returned value
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/// will be between 0 and 4095.
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STATIC mp_obj_t adc_read(mp_obj_t self_in) {
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pyb_adc_obj_t *self = self_in;
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uint32_t sample;
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// wait until a new value is available
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while (!MAP_ADCFIFOLvlGet(ADC_BASE, self->channel));
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// read the sample
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sample = MAP_ADCFIFORead(ADC_BASE, self->channel);
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// the 12 bit sampled value is stored in bits [13:2]
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return MP_OBJ_NEW_SMALL_INT((sample & 0x3FFF) >> 2);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_read_obj, adc_read);
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/// \method enable()
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/// Enable the adc channel
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STATIC mp_obj_t adc_enable(mp_obj_t self_in) {
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pyb_adc_obj_t *self = self_in;
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pybadc_init(self);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_enable_obj, adc_enable);
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/// \method disable()
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/// Disable the adc channel
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STATIC mp_obj_t adc_disable(mp_obj_t self_in) {
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pyb_adc_obj_t *self = self_in;
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MAP_ADCChannelDisable(ADC_BASE, self->channel);
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// unregister it with the sleep module
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pybsleep_remove ((const mp_obj_t)self);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_disable_obj, adc_disable);
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STATIC const mp_map_elem_t adc_locals_dict_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&adc_read_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_enable), (mp_obj_t)&adc_enable_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_disable), (mp_obj_t)&adc_disable_obj },
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};
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STATIC MP_DEFINE_CONST_DICT(adc_locals_dict, adc_locals_dict_table);
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const mp_obj_type_t pyb_adc_type = {
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{ &mp_type_type },
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.name = MP_QSTR_ADC,
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.print = adc_print,
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.make_new = adc_make_new,
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.locals_dict = (mp_obj_t)&adc_locals_dict,
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};
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