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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2015-2016 Damien P. George
*
* 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.
*/
extern "C" {
#include <stdio.h>
#include <string.h>
#include "gpio_api.h"
#include "nrf_gpio.h"
#include "py/runtime0.h"
#include "py/runtime.h"
#include "microbit/modmicrobit.h"
// This is the pixel colour ordering
#define COL_NUM_COMPONENTS (3)
#define COL_IDX_RED (1)
#define COL_IDX_GREEN (0)
#define COL_IDX_BLUE (2)
// This is implemented in assembler to get the right timing
extern void sendNeopixelBuffer(uint32_t pin, uint8_t* data_address, uint16_t num_leds);
extern const mp_obj_type_t neopixel_type;
typedef struct _neopixel_obj_t {
mp_obj_base_t base;
uint16_t pin_num;
uint16_t num_pixels;
uint8_t data[];
} neopixel_obj_t;
STATIC mp_obj_t neopixel_show_(mp_obj_t self_in);
static inline void neopixel_clear_data(neopixel_obj_t *self) {
memset(&self->data[0], 0, COL_NUM_COMPONENTS * self->num_pixels);
}
STATIC mp_obj_t neopixel_make_new(const mp_obj_type_t *type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
(void)type_in;
mp_arg_check_num(n_args, n_kw, 2, 2, false);
PinName pin = (PinName)microbit_obj_get_pin_name(args[0]);
mp_int_t num_pixels = mp_obj_get_int(args[1]);
if (num_pixels <= 0) {
mp_raise_ValueError("invalid number of pixels");
}
neopixel_obj_t *self = m_new_obj_var(neopixel_obj_t, uint8_t, COL_NUM_COMPONENTS * num_pixels);
self->base.type = &neopixel_type;
self->pin_num = pin;
self->num_pixels = num_pixels;
neopixel_clear_data(self);
// Configure pin as output and set it low
nrf_gpio_cfg_output(pin);
NRF_GPIO->OUTCLR = (1UL << pin);
return self;
}
STATIC mp_obj_t neopixel_unary_op(mp_uint_t op, mp_obj_t self_in) {
neopixel_obj_t *self = (neopixel_obj_t*)self_in;
switch (op) {
case MP_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(self->num_pixels);
default: return MP_OBJ_NULL; // op not supported
}
}
STATIC mp_obj_t neopixel_subscr(mp_obj_t self_in, mp_obj_t index_in, mp_obj_t value) {
neopixel_obj_t *self = (neopixel_obj_t*)self_in;
mp_uint_t index = mp_get_index(self->base.type, self->num_pixels, index_in, false);
index *= COL_NUM_COMPONENTS;
if (value == MP_OBJ_NULL) {
// delete item
return MP_OBJ_NULL; // op not supported
} else if (value == MP_OBJ_SENTINEL) {
// load
mp_obj_t rgb[COL_NUM_COMPONENTS] = {
MP_OBJ_NEW_SMALL_INT(self->data[index + COL_IDX_RED]),
MP_OBJ_NEW_SMALL_INT(self->data[index + COL_IDX_GREEN]),
MP_OBJ_NEW_SMALL_INT(self->data[index + COL_IDX_BLUE]),
};
return mp_obj_new_tuple(COL_NUM_COMPONENTS, rgb);
} else {
// store
mp_obj_t *rgb;
mp_obj_get_array_fixed_n(value, COL_NUM_COMPONENTS, &rgb);
mp_int_t r = mp_obj_get_int(rgb[0]);
mp_int_t g = mp_obj_get_int(rgb[1]);
mp_int_t b = mp_obj_get_int(rgb[2]);
if (r < 0 || r > 255 || g < 0 || g > 255 || b < 0 || b > 255) {
mp_raise_ValueError("invalid colour");
}
self->data[index + COL_IDX_RED] = r;
self->data[index + COL_IDX_GREEN] = g;
self->data[index + COL_IDX_BLUE] = b;
return mp_const_none;
}
}
STATIC mp_obj_t neopixel_clear_(mp_obj_t self_in) {
neopixel_obj_t *self = (neopixel_obj_t*)self_in;
neopixel_clear_data(self);
neopixel_show_(self_in);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(neopixel_clear_obj, neopixel_clear_);
STATIC mp_obj_t neopixel_show_(mp_obj_t self_in) {
neopixel_obj_t *self = (neopixel_obj_t*)self_in;
// Call external assember to do the time critical pin waggling.
// Be aware that this runs with interrupts off.
uint32_t pin_mask = (1UL << self->pin_num);
NRF_GPIO->OUTCLR = pin_mask;
sendNeopixelBuffer(pin_mask, &self->data[0], self->num_pixels);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_1(neopixel_show_obj, neopixel_show_);
STATIC const mp_map_elem_t neopixel_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_clear), (mp_obj_t)&neopixel_clear_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_show), (mp_obj_t)&neopixel_show_obj },
};
STATIC MP_DEFINE_CONST_DICT(neopixel_locals_dict, neopixel_locals_dict_table);
const mp_obj_type_t neopixel_type = {
{ &mp_type_type },
.name = MP_QSTR_NeoPixel,
.print = NULL,
.make_new = neopixel_make_new,
.call = NULL,
.unary_op = neopixel_unary_op,
.binary_op = NULL,
.attr = NULL,
.subscr = neopixel_subscr,
.getiter = NULL,
.iternext = NULL,
.buffer_p = {NULL},
.protocol = NULL,
.parent = NULL,
.locals_dict = (mp_obj_dict_t*)&neopixel_locals_dict,
};
STATIC const mp_map_elem_t neopixel_module_globals_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_neopixel) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_NeoPixel), (mp_obj_t)&neopixel_type },
};
STATIC MP_DEFINE_CONST_DICT(neopixel_module_globals, neopixel_module_globals_table);
const mp_obj_module_t neopixel_module = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t*)&neopixel_module_globals,
};
}
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