311 lines
11 KiB
C
311 lines
11 KiB
C
/*
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* This file is part of the MicroPython 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/runtime.h"
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#include "py/binary.h"
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#include "py/gc.h"
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#include "py/mperrno.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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/******************************************************************************
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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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bool enabled;
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} pyb_adc_obj_t;
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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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byte channel;
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byte id;
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bool enabled;
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} pyb_adc_channel_obj_t;
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/******************************************************************************
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DECLARE PRIVATE DATA
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******************************************************************************/
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STATIC pyb_adc_channel_obj_t pyb_adc_channel_obj[PYB_ADC_NUM_CHANNELS] = { {.pin = &pin_GP2, .channel = ADC_CH_0, .id = 0, .enabled = false},
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{.pin = &pin_GP3, .channel = ADC_CH_1, .id = 1, .enabled = false},
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{.pin = &pin_GP4, .channel = ADC_CH_2, .id = 2, .enabled = false},
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{.pin = &pin_GP5, .channel = ADC_CH_3, .id = 3, .enabled = false} };
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STATIC pyb_adc_obj_t pyb_adc_obj = {.enabled = false};
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STATIC const mp_obj_type_t pyb_adc_channel_type;
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/******************************************************************************
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DECLARE PRIVATE FUNCTIONS
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******************************************************************************/
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STATIC mp_obj_t adc_channel_deinit(mp_obj_t self_in);
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/******************************************************************************
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DEFINE PUBLIC FUNCTIONS
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******************************************************************************/
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STATIC void pyb_adc_init (pyb_adc_obj_t *self) {
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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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self->enabled = true;
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}
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STATIC void pyb_adc_check_init(void) {
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// not initialized
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if (!pyb_adc_obj.enabled) {
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mp_raise_OSError(MP_EPERM);
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}
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}
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STATIC void pyb_adc_channel_init (pyb_adc_channel_obj_t *self) {
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// the ADC block must be enabled first
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pyb_adc_check_init();
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// configure the pin in analog mode
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pin_config (self->pin, -1, PIN_TYPE_ANALOG, PIN_TYPE_STD, -1, PIN_STRENGTH_2MA);
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// enable the ADC channel
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MAP_ADCChannelEnable(ADC_BASE, self->channel);
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self->enabled = true;
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}
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STATIC void pyb_adc_deinit_all_channels (void) {
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for (int i = 0; i < PYB_ADC_NUM_CHANNELS; i++) {
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adc_channel_deinit(&pyb_adc_channel_obj[i]);
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}
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}
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/******************************************************************************/
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/* MicroPython 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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if (self->enabled) {
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mp_printf(print, "ADC(0, bits=12)");
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} else {
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mp_printf(print, "ADC(0)");
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}
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}
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STATIC const mp_arg_t pyb_adc_init_args[] = {
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{ MP_QSTR_id, MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 12} },
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};
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STATIC mp_obj_t adc_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
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// parse args
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mp_map_t kw_args;
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mp_map_init_fixed_table(&kw_args, n_kw, all_args + n_args);
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mp_arg_val_t args[MP_ARRAY_SIZE(pyb_adc_init_args)];
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mp_arg_parse_all(n_args, all_args, &kw_args, MP_ARRAY_SIZE(args), pyb_adc_init_args, args);
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// check the peripheral id
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if (args[0].u_int != 0) {
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mp_raise_OSError(MP_ENODEV);
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}
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// check the number of bits
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if (args[1].u_int != 12) {
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mp_raise_ValueError(mpexception_value_invalid_arguments);
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}
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// setup the object
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pyb_adc_obj_t *self = &pyb_adc_obj;
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self->base.type = &pyb_adc_type;
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// initialize and register with the sleep module
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pyb_adc_init(self);
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pyb_sleep_add ((const mp_obj_t)self, (WakeUpCB_t)pyb_adc_init);
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return self;
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}
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STATIC mp_obj_t adc_init(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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// parse args
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mp_arg_val_t args[MP_ARRAY_SIZE(pyb_adc_init_args) - 1];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(args), &pyb_adc_init_args[1], args);
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// check the number of bits
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if (args[0].u_int != 12) {
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mp_raise_ValueError(mpexception_value_invalid_arguments);
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}
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pyb_adc_init(pos_args[0]);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(adc_init_obj, 1, adc_init);
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STATIC mp_obj_t adc_deinit(mp_obj_t self_in) {
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pyb_adc_obj_t *self = self_in;
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// first deinit all channels
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pyb_adc_deinit_all_channels();
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MAP_ADCDisable(ADC_BASE);
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self->enabled = false;
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// unregister it with the sleep module
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pyb_sleep_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_deinit_obj, adc_deinit);
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STATIC mp_obj_t adc_channel(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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STATIC const mp_arg_t pyb_adc_channel_args[] = {
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{ MP_QSTR_id, MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_pin, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
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};
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// parse args
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mp_arg_val_t args[MP_ARRAY_SIZE(pyb_adc_channel_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(args), pyb_adc_channel_args, args);
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uint ch_id;
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if (args[0].u_obj != MP_OBJ_NULL) {
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ch_id = mp_obj_get_int(args[0].u_obj);
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if (ch_id >= PYB_ADC_NUM_CHANNELS) {
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mp_raise_ValueError(mpexception_value_invalid_arguments);
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} else if (args[1].u_obj != mp_const_none) {
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uint pin_ch_id = pin_find_peripheral_type (args[1].u_obj, PIN_FN_ADC, 0);
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if (ch_id != pin_ch_id) {
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mp_raise_ValueError(mpexception_value_invalid_arguments);
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}
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}
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} else {
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ch_id = pin_find_peripheral_type (args[1].u_obj, PIN_FN_ADC, 0);
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}
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// setup the object
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pyb_adc_channel_obj_t *self = &pyb_adc_channel_obj[ch_id];
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self->base.type = &pyb_adc_channel_type;
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pyb_adc_channel_init (self);
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// register it with the sleep module
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pyb_sleep_add ((const mp_obj_t)self, (WakeUpCB_t)pyb_adc_channel_init);
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return self;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(adc_channel_obj, 1, adc_channel);
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STATIC const mp_rom_map_elem_t adc_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&adc_init_obj) },
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&adc_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR_channel), MP_ROM_PTR(&adc_channel_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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STATIC void adc_channel_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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pyb_adc_channel_obj_t *self = self_in;
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if (self->enabled) {
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mp_printf(print, "ADCChannel(%u, pin=%q)", self->id, self->pin->name);
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} else {
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mp_printf(print, "ADCChannel(%u)", self->id);
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}
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}
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STATIC mp_obj_t adc_channel_init(mp_obj_t self_in) {
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pyb_adc_channel_obj_t *self = self_in;
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// re-enable it
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pyb_adc_channel_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_channel_init_obj, adc_channel_init);
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STATIC mp_obj_t adc_channel_deinit(mp_obj_t self_in) {
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pyb_adc_channel_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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pyb_sleep_remove ((const mp_obj_t)self);
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self->enabled = false;
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_channel_deinit_obj, adc_channel_deinit);
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STATIC mp_obj_t adc_channel_value(mp_obj_t self_in) {
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pyb_adc_channel_obj_t *self = self_in;
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uint32_t value;
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// the channel must be enabled
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if (!self->enabled) {
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mp_raise_OSError(MP_EPERM);
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}
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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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value = 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((value & 0x3FFF) >> 2);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_channel_value_obj, adc_channel_value);
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STATIC mp_obj_t adc_channel_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 0, 0, false);
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return adc_channel_value (self_in);
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}
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STATIC const mp_rom_map_elem_t adc_channel_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&adc_channel_init_obj) },
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&adc_channel_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR_value), MP_ROM_PTR(&adc_channel_value_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(adc_channel_locals_dict, adc_channel_locals_dict_table);
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STATIC const mp_obj_type_t pyb_adc_channel_type = {
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{ &mp_type_type },
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.name = MP_QSTR_ADCChannel,
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.print = adc_channel_print,
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.call = adc_channel_call,
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.locals_dict = (mp_obj_t)&adc_channel_locals_dict,
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};
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