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atmel-samd: Initial ADC support.
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13 files changed

+3691
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‎atmel-samd/Makefile‎

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@@ -47,6 +47,7 @@ INC += $(addprefix -Iasf/sam0/,\
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drivers/extint/ \
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drivers/port \
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drivers/system \
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drivers/adc/adc_sam_d_r \
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drivers/system/clock \
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drivers/system/clock/clock_samd21_r21_da \
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drivers/system/interrupt \
@@ -97,6 +98,7 @@ SRC_ASF = $(addprefix asf/sam0/,\
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drivers/sercom/sercom_interrupt.c \
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drivers/sercom/usart/usart.c \
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drivers/sercom/usart/usart_interrupt.c \
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drivers/adc/adc_sam_d_r/adc.c \
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drivers/system/clock/clock_samd21_r21_da/clock.c \
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drivers/system/clock/clock_samd21_r21_da/gclk.c \
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drivers/system/interrupt/system_interrupt.c \
@@ -108,6 +110,7 @@ SRC_ASF = $(addprefix asf/sam0/,\
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)
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SRC_C = \
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adc.c \
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main.c \
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modmachine.c \
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modutime.c \

‎atmel-samd/adc.c‎

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/*
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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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*
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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/nlr.h"
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#include "py/runtime.h"
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#include "py/binary.h"
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#include "py/mphal.h"
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#include "adc.h"
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#include "pin.h"
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#include "asf/sam0/drivers/adc/adc.h"
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/// \moduleref machine
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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 = machine.ADC(pin) # create an analog object from a pin
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/// val = adc.read() # read an analog value
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typedef struct {
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mp_obj_base_t base;
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pin_obj_t * pin;
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struct adc_module adc_instance;
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} adc_obj_t;
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/******************************************************************************/
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/* Micro Python bindings : adc object (single channel) */
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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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adc_obj_t *self = self_in;
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mp_print_str(print, "<ADC on ");
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mp_obj_print_helper(print, self->pin, PRINT_STR);
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}
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STATIC void adc_init_single(adc_obj_t *adc_obj) {
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struct adc_config config_adc;
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adc_get_config_defaults(&config_adc);
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config_adc.positive_input = adc_obj->pin->adc_input;
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config_adc.resolution = ADC_RESOLUTION_CUSTOM;
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config_adc.accumulate_samples = ADC_ACCUMULATE_SAMPLES_16;
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config_adc.divide_result = ADC_DIVIDE_RESULT_16;
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config_adc.clock_prescaler = ADC_CLOCK_PRESCALER_DIV128;
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adc_init(&adc_obj->adc_instance, ADC, &config_adc);
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}
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/// \classmethod \constructor(pin)
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/// Create an ADC object associated with the given pin.
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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(const mp_obj_type_t *type, 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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// 1st argument is the pin name
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mp_obj_t pin_obj = args[0];
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const pin_obj_t *pin = pin_find(pin_obj);
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if (!pin->has_adc) {
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// No ADC function on that pin
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "pin %q does not have ADC capabilities", pin->name));
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}
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adc_obj_t *o = m_new_obj(adc_obj_t);
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memset(o, 0, sizeof(*o));
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o->base.type = &adc_type;
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o->pin = pin_obj;
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adc_init_single(o);
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return o;
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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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// TODO(tannewt): Don't turn it all on just for one read. This simplifies
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// handling of reading multiple inputs and surviving sleep though so for now its
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// ok.
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STATIC mp_obj_t mp_adc_read(mp_obj_t self_in) {
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adc_obj_t *self = self_in;
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adc_enable(&self->adc_instance);
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adc_start_conversion(&self->adc_instance);
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uint16_t data;
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enum status_code status = adc_read(&self->adc_instance, &data);
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while (status == STATUS_BUSY) {
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status = adc_read(&self->adc_instance, &data);
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}
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if (status == STATUS_ERR_OVERFLOW) {
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// TODO(tannewt): Throw an error.
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}
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adc_disable(&self->adc_instance);
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return mp_obj_new_int(data);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_read_obj, mp_adc_read);
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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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};
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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 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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};

‎atmel-samd/adc.h‎

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/*
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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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*
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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
19+
* 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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extern const mp_obj_type_t adc_type;

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