469345e728
This commit adds a new port "rp2" which targets the new Raspberry Pi RP2040 microcontroller. The build system uses pure cmake (with a small Makefile wrapper for convenience). The USB driver is TinyUSB, and there is a machine module with most of the standard classes implemented. Some examples are provided in the examples/rp2/ directory. Work done in collaboration with Graham Sanderson. Signed-off-by: Damien George <damien@micropython.org>
121 lines
4.3 KiB
C
121 lines
4.3 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2020-2021 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.
|
|
*/
|
|
|
|
#include "py/runtime.h"
|
|
#include "py/mphal.h"
|
|
#include "hardware/adc.h"
|
|
|
|
#define ADC_IS_VALID_GPIO(gpio) ((gpio) >= 26 && (gpio) <= 29)
|
|
#define ADC_CHANNEL_FROM_GPIO(gpio) ((gpio) - 26)
|
|
#define ADC_CHANNEL_TEMPSENSOR (4)
|
|
|
|
STATIC uint16_t adc_config_and_read_u16(uint32_t channel) {
|
|
adc_select_input(channel);
|
|
uint32_t raw = adc_read();
|
|
const uint32_t bits = 12;
|
|
// Scale raw reading to 16 bit value using a Taylor expansion (for 8 <= bits <= 16)
|
|
return raw << (16 - bits) | raw >> (2 * bits - 16);
|
|
}
|
|
|
|
/******************************************************************************/
|
|
// MicroPython bindings for machine.ADC
|
|
|
|
const mp_obj_type_t machine_adc_type;
|
|
|
|
typedef struct _machine_adc_obj_t {
|
|
mp_obj_base_t base;
|
|
uint32_t channel;
|
|
} machine_adc_obj_t;
|
|
|
|
STATIC void machine_adc_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
|
|
machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
mp_printf(print, "<ADC channel=%u>", self->channel);
|
|
}
|
|
|
|
// ADC(id)
|
|
STATIC mp_obj_t machine_adc_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
|
|
// Check number of arguments
|
|
mp_arg_check_num(n_args, n_kw, 1, 1, false);
|
|
|
|
mp_obj_t source = all_args[0];
|
|
|
|
uint32_t channel;
|
|
if (mp_obj_is_int(source)) {
|
|
// Get and validate channel number.
|
|
channel = mp_obj_get_int(source);
|
|
if (!((channel >= 0 && channel <= ADC_CHANNEL_TEMPSENSOR) || ADC_IS_VALID_GPIO(channel))) {
|
|
mp_raise_ValueError(MP_ERROR_TEXT("invalid channel"));
|
|
}
|
|
|
|
} else {
|
|
// Get GPIO and check it has ADC capabilities.
|
|
channel = mp_hal_get_pin_obj(source);
|
|
if (!ADC_IS_VALID_GPIO(channel)) {
|
|
mp_raise_ValueError(MP_ERROR_TEXT("Pin doesn't have ADC capabilities"));
|
|
}
|
|
}
|
|
|
|
adc_init();
|
|
|
|
if (ADC_IS_VALID_GPIO(channel)) {
|
|
// Configure the GPIO pin in ADC mode.
|
|
adc_gpio_init(channel);
|
|
channel = ADC_CHANNEL_FROM_GPIO(channel);
|
|
} else if (channel == ADC_CHANNEL_TEMPSENSOR) {
|
|
// Enable temperature sensor.
|
|
adc_set_temp_sensor_enabled(1);
|
|
}
|
|
|
|
// Create ADC object.
|
|
machine_adc_obj_t *o = m_new_obj(machine_adc_obj_t);
|
|
o->base.type = &machine_adc_type;
|
|
o->channel = channel;
|
|
|
|
return MP_OBJ_FROM_PTR(o);
|
|
}
|
|
|
|
// read_u16()
|
|
STATIC mp_obj_t machine_adc_read_u16(mp_obj_t self_in) {
|
|
machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
return MP_OBJ_NEW_SMALL_INT(adc_config_and_read_u16(self->channel));
|
|
}
|
|
MP_DEFINE_CONST_FUN_OBJ_1(machine_adc_read_u16_obj, machine_adc_read_u16);
|
|
|
|
STATIC const mp_rom_map_elem_t machine_adc_locals_dict_table[] = {
|
|
{ MP_ROM_QSTR(MP_QSTR_read_u16), MP_ROM_PTR(&machine_adc_read_u16_obj) },
|
|
|
|
{ MP_ROM_QSTR(MP_QSTR_CORE_TEMP), MP_ROM_INT(ADC_CHANNEL_TEMPSENSOR) },
|
|
};
|
|
STATIC MP_DEFINE_CONST_DICT(machine_adc_locals_dict, machine_adc_locals_dict_table);
|
|
|
|
const mp_obj_type_t machine_adc_type = {
|
|
{ &mp_type_type },
|
|
.name = MP_QSTR_ADC,
|
|
.print = machine_adc_print,
|
|
.make_new = machine_adc_make_new,
|
|
.locals_dict = (mp_obj_dict_t *)&machine_adc_locals_dict,
|
|
};
|