circuitpython/ports/cc3200/mods/pybadc.c

311 lines
11 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
* Copyright (c) 2015 Daniel Campora
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include "py/runtime.h"
#include "py/binary.h"
#include "py/gc.h"
#include "py/mperrno.h"
#include "bufhelper.h"
#include "inc/hw_types.h"
#include "inc/hw_adc.h"
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "rom_map.h"
#include "interrupt.h"
#include "pin.h"
#include "gpio.h"
#include "prcm.h"
#include "adc.h"
#include "pybadc.h"
#include "pybpin.h"
#include "pybsleep.h"
#include "pins.h"
#include "mpexception.h"
/******************************************************************************
DECLARE CONSTANTS
******************************************************************************/
#define PYB_ADC_NUM_CHANNELS 4
/******************************************************************************
DEFINE TYPES
******************************************************************************/
typedef struct {
mp_obj_base_t base;
bool enabled;
} pyb_adc_obj_t;
typedef struct {
mp_obj_base_t base;
pin_obj_t *pin;
byte channel;
byte id;
bool enabled;
} pyb_adc_channel_obj_t;
/******************************************************************************
DECLARE PRIVATE DATA
******************************************************************************/
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},
{.pin = &pin_GP3, .channel = ADC_CH_1, .id = 1, .enabled = false},
{.pin = &pin_GP4, .channel = ADC_CH_2, .id = 2, .enabled = false},
{.pin = &pin_GP5, .channel = ADC_CH_3, .id = 3, .enabled = false} };
STATIC pyb_adc_obj_t pyb_adc_obj = {.enabled = false};
STATIC const mp_obj_type_t pyb_adc_channel_type;
/******************************************************************************
DECLARE PRIVATE FUNCTIONS
******************************************************************************/
STATIC mp_obj_t adc_channel_deinit(mp_obj_t self_in);
/******************************************************************************
DEFINE PUBLIC FUNCTIONS
******************************************************************************/
STATIC void pyb_adc_init (pyb_adc_obj_t *self) {
// enable and configure the timer
MAP_ADCTimerConfig(ADC_BASE, (1 << 17) - 1);
MAP_ADCTimerEnable(ADC_BASE);
// enable the ADC peripheral
MAP_ADCEnable(ADC_BASE);
self->enabled = true;
}
STATIC void pyb_adc_check_init(void) {
// not initialized
if (!pyb_adc_obj.enabled) {
mp_raise_OSError(MP_EPERM);
}
}
STATIC void pyb_adc_channel_init (pyb_adc_channel_obj_t *self) {
// the ADC block must be enabled first
pyb_adc_check_init();
// configure the pin in analog mode
pin_config (self->pin, -1, PIN_TYPE_ANALOG, PIN_TYPE_STD, -1, PIN_STRENGTH_2MA);
// enable the ADC channel
MAP_ADCChannelEnable(ADC_BASE, self->channel);
self->enabled = true;
}
STATIC void pyb_adc_deinit_all_channels (void) {
for (int i = 0; i < PYB_ADC_NUM_CHANNELS; i++) {
adc_channel_deinit(&pyb_adc_channel_obj[i]);
}
}
/******************************************************************************/
/* MicroPython bindings : adc object */
STATIC void adc_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
pyb_adc_obj_t *self = self_in;
if (self->enabled) {
mp_printf(print, "ADC(0, bits=12)");
} else {
mp_printf(print, "ADC(0)");
}
}
STATIC const mp_arg_t pyb_adc_init_args[] = {
{ MP_QSTR_id, MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 12} },
};
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) {
// parse args
mp_map_t kw_args;
mp_map_init_fixed_table(&kw_args, n_kw, all_args + n_args);
mp_arg_val_t args[MP_ARRAY_SIZE(pyb_adc_init_args)];
mp_arg_parse_all(n_args, all_args, &kw_args, MP_ARRAY_SIZE(args), pyb_adc_init_args, args);
// check the peripheral id
if (args[0].u_int != 0) {
mp_raise_OSError(MP_ENODEV);
}
// check the number of bits
if (args[1].u_int != 12) {
mp_raise_ValueError(mpexception_value_invalid_arguments);
}
// setup the object
pyb_adc_obj_t *self = &pyb_adc_obj;
self->base.type = &pyb_adc_type;
// initialize and register with the sleep module
pyb_adc_init(self);
pyb_sleep_add ((const mp_obj_t)self, (WakeUpCB_t)pyb_adc_init);
return self;
}
STATIC mp_obj_t adc_init(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
// parse args
mp_arg_val_t args[MP_ARRAY_SIZE(pyb_adc_init_args) - 1];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(args), &pyb_adc_init_args[1], args);
// check the number of bits
if (args[0].u_int != 12) {
mp_raise_ValueError(mpexception_value_invalid_arguments);
}
pyb_adc_init(pos_args[0]);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(adc_init_obj, 1, adc_init);
STATIC mp_obj_t adc_deinit(mp_obj_t self_in) {
pyb_adc_obj_t *self = self_in;
// first deinit all channels
pyb_adc_deinit_all_channels();
MAP_ADCDisable(ADC_BASE);
self->enabled = false;
// unregister it with the sleep module
pyb_sleep_remove ((const mp_obj_t)self);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_deinit_obj, adc_deinit);
STATIC mp_obj_t adc_channel(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
STATIC const mp_arg_t pyb_adc_channel_args[] = {
{ MP_QSTR_id, MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_pin, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
};
// parse args
mp_arg_val_t args[MP_ARRAY_SIZE(pyb_adc_channel_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(args), pyb_adc_channel_args, args);
uint ch_id;
if (args[0].u_obj != MP_OBJ_NULL) {
ch_id = mp_obj_get_int(args[0].u_obj);
if (ch_id >= PYB_ADC_NUM_CHANNELS) {
mp_raise_ValueError(mpexception_value_invalid_arguments);
} else if (args[1].u_obj != mp_const_none) {
uint pin_ch_id = pin_find_peripheral_type (args[1].u_obj, PIN_FN_ADC, 0);
if (ch_id != pin_ch_id) {
mp_raise_ValueError(mpexception_value_invalid_arguments);
}
}
} else {
ch_id = pin_find_peripheral_type (args[1].u_obj, PIN_FN_ADC, 0);
}
// setup the object
pyb_adc_channel_obj_t *self = &pyb_adc_channel_obj[ch_id];
self->base.type = &pyb_adc_channel_type;
pyb_adc_channel_init (self);
// register it with the sleep module
pyb_sleep_add ((const mp_obj_t)self, (WakeUpCB_t)pyb_adc_channel_init);
return self;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(adc_channel_obj, 1, adc_channel);
STATIC const mp_rom_map_elem_t adc_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&adc_init_obj) },
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&adc_deinit_obj) },
{ MP_ROM_QSTR(MP_QSTR_channel), MP_ROM_PTR(&adc_channel_obj) },
};
STATIC MP_DEFINE_CONST_DICT(adc_locals_dict, adc_locals_dict_table);
const mp_obj_type_t pyb_adc_type = {
{ &mp_type_type },
.name = MP_QSTR_ADC,
.print = adc_print,
.make_new = adc_make_new,
.locals_dict = (mp_obj_t)&adc_locals_dict,
};
STATIC void adc_channel_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
pyb_adc_channel_obj_t *self = self_in;
if (self->enabled) {
mp_printf(print, "ADCChannel(%u, pin=%q)", self->id, self->pin->name);
} else {
mp_printf(print, "ADCChannel(%u)", self->id);
}
}
STATIC mp_obj_t adc_channel_init(mp_obj_t self_in) {
pyb_adc_channel_obj_t *self = self_in;
// re-enable it
pyb_adc_channel_init(self);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_channel_init_obj, adc_channel_init);
STATIC mp_obj_t adc_channel_deinit(mp_obj_t self_in) {
pyb_adc_channel_obj_t *self = self_in;
MAP_ADCChannelDisable(ADC_BASE, self->channel);
// unregister it with the sleep module
pyb_sleep_remove ((const mp_obj_t)self);
self->enabled = false;
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_channel_deinit_obj, adc_channel_deinit);
STATIC mp_obj_t adc_channel_value(mp_obj_t self_in) {
pyb_adc_channel_obj_t *self = self_in;
uint32_t value;
// the channel must be enabled
if (!self->enabled) {
mp_raise_OSError(MP_EPERM);
}
// wait until a new value is available
while (!MAP_ADCFIFOLvlGet(ADC_BASE, self->channel));
// read the sample
value = MAP_ADCFIFORead(ADC_BASE, self->channel);
// the 12 bit sampled value is stored in bits [13:2]
return MP_OBJ_NEW_SMALL_INT((value & 0x3FFF) >> 2);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_channel_value_obj, adc_channel_value);
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) {
mp_arg_check_num(n_args, n_kw, 0, 0, false);
return adc_channel_value (self_in);
}
STATIC const mp_rom_map_elem_t adc_channel_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&adc_channel_init_obj) },
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&adc_channel_deinit_obj) },
{ MP_ROM_QSTR(MP_QSTR_value), MP_ROM_PTR(&adc_channel_value_obj) },
};
STATIC MP_DEFINE_CONST_DICT(adc_channel_locals_dict, adc_channel_locals_dict_table);
STATIC const mp_obj_type_t pyb_adc_channel_type = {
{ &mp_type_type },
.name = MP_QSTR_ADCChannel,
.print = adc_channel_print,
.call = adc_channel_call,
.locals_dict = (mp_obj_t)&adc_channel_locals_dict,
};