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Diffstat (limited to 'cc3200/mods/pybadc.c')
| -rw-r--r-- | cc3200/mods/pybadc.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/cc3200/mods/pybadc.c b/cc3200/mods/pybadc.c new file mode 100644 index 000000000..a56761769 --- /dev/null +++ b/cc3200/mods/pybadc.c @@ -0,0 +1,183 @@ +/* + * This file is part of the Micro Python 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 "mpconfig.h" +#include MICROPY_HAL_H +#include "py/nlr.h" +#include "py/runtime.h" +#include "py/binary.h" +#include "py/gc.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 "prcm.h" +#include "adc.h" +#include "pybadc.h" +#include "pybpin.h" +#include "pins.h" +#include "mpexception.h" + + +/// \moduleref pyb +/// \class ADC - analog to digital conversion: read analog values on a pin +/// +/// Usage: +/// +/// adc = pyb.ADC(channel) # create an adc object on the given channel (0 to 3) +/// adc.read() # read channel value +/// +/// The sample rate is fixed to 62.5KHz and the resolution to 12 bits. + +typedef struct _pyb_obj_adc_t { + mp_obj_base_t base; + byte channel; + byte num; +} pyb_obj_adc_t; + + +/******************************************************************************/ +/* Micro Python bindings : adc object */ + +STATIC void adc_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) { + pyb_obj_adc_t *self = self_in; + print(env, "<ADC, channel=%u>", self->num); +} + +/// \classmethod \constructor(channel) +/// Create an ADC object associated with the given channel. +/// This allows you to then read analog values on that pin. +STATIC mp_obj_t adc_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) { + // check number of arguments + mp_arg_check_num(n_args, n_kw, 1, 1, false); + + // the first argument is the channel number + uint num = mp_obj_get_int(args[0]); + const pin_obj_t *pin; + uint channel; + switch (num) { + case 0: + channel = ADC_CH_0; + pin = &pin_GPIO2; + break; + case 1: + channel = ADC_CH_1; + pin = &pin_GPIO3; + break; + case 2: + channel = ADC_CH_2; + pin = &pin_GPIO4; + break; + case 3: + channel = ADC_CH_3; + pin = &pin_GPIO5; + break; + default: + nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments)); + break; + } + + // disable the callback before re-configuring + pyb_obj_adc_t *self = m_new_obj(pyb_obj_adc_t); + self->base.type = &pyb_adc_type; + self->channel = channel; + self->num = num; + + // configure the pin in analog mode + pin_config (pin, 0, 0, PIN_TYPE_ANALOG, PIN_STRENGTH_2MA); + + // enable the ADC channel + MAP_ADCChannelEnable(ADC_BASE, channel); + // enable and configure the timer + MAP_ADCTimerConfig(ADC_BASE, (1 << 17) - 1); + MAP_ADCTimerEnable(ADC_BASE); + // enable the ADC peripheral + MAP_ADCEnable(ADC_BASE); + + return self; +} + +/// \method read() +/// Read the value on the analog pin and return it. The returned value +/// will be between 0 and 4095. +STATIC mp_obj_t adc_read(mp_obj_t self_in) { + pyb_obj_adc_t *self = self_in; + uint32_t sample; + + // wait until a new value is available + while (!MAP_ADCFIFOLvlGet(ADC_BASE, self->channel)); + // read the sample + sample = MAP_ADCFIFORead(ADC_BASE, self->channel); + // the 12 bit sampled value is stored in bits [13:2] + return MP_OBJ_NEW_SMALL_INT((sample & 0x3FFF) >> 2); +} +STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_read_obj, adc_read); + +/// \method enable() +/// Enable the adc channel +STATIC mp_obj_t adc_enable(mp_obj_t self_in) { + pyb_obj_adc_t *self = self_in; + + MAP_ADCChannelEnable(ADC_BASE, self->channel); + return mp_const_none; +} +STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_enable_obj, adc_enable); + +/// \method disable() +/// Disable the adc channel +STATIC mp_obj_t adc_disable(mp_obj_t self_in) { + pyb_obj_adc_t *self = self_in; + + MAP_ADCChannelDisable(ADC_BASE, self->channel); + return mp_const_none; +} +STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_disable_obj, adc_disable); + +STATIC const mp_map_elem_t adc_locals_dict_table[] = { + { MP_OBJ_NEW_QSTR(MP_QSTR___del__), (mp_obj_t)&adc_disable_obj }, + { MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&adc_read_obj }, + { MP_OBJ_NEW_QSTR(MP_QSTR_enable), (mp_obj_t)&adc_enable_obj }, + { MP_OBJ_NEW_QSTR(MP_QSTR_disable), (mp_obj_t)&adc_disable_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, +}; + |