2dd47239de
In general the changes are: 1. Peripheral (UART, SPI, ADC, I2C, Timer) IDs start from 1, not zero. 2. Make I2C and SPI require the ID even when there's only one bus. 3. Make I2C and SPI accept 'mode' parameter even though only MASTER is supported.
213 lines
7.0 KiB
C
213 lines
7.0 KiB
C
/*
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* This file is part of the Micro Python 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/mpconfig.h"
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#include MICROPY_HAL_H
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#include "py/nlr.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 "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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/// \moduleref pyb
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/// \class ADC - analog to digital conversion: read analog values on a pin
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///
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/// Usage:
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///
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/// adc = pyb.ADC(channel) # create an adc object on the given channel (1 to 4)
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/// this automatically configures the pin associated to
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/// that analog channel.
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/// adc.read() # read channel value
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///
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/// The sample rate is fixed to 62.5KHz and the resolution to 12 bits.
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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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byte channel;
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byte idx;
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} pyb_adc_obj_t;
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/******************************************************************************
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DEFINE PUBLIC FUNCTIONS
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******************************************************************************/
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STATIC void pybadc_init (pyb_adc_obj_t *self) {
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// enable the ADC channel
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MAP_ADCChannelEnable(ADC_BASE, self->channel);
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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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}
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/******************************************************************************
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DECLARE PRIVATE DATA
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******************************************************************************/
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STATIC pyb_adc_obj_t pyb_adc_obj[PYB_ADC_NUM_CHANNELS];
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/******************************************************************************/
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/* Micro Python 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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mp_printf(print, "<ADC, channel=%u>", (self->idx + 1));
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}
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/// \classmethod \constructor(channel)
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/// Create an ADC object associated with the given channel.
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/// This allows you to then read analog values on that pin.
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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) {
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// check number of arguments
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mp_arg_check_num(n_args, n_kw, 1, 1, false);
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// the first argument is the channel number
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int32_t idx = mp_obj_get_int(args[0]) - 1;
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const pin_obj_t *pin;
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uint channel;
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switch (idx) {
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case 0:
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channel = ADC_CH_0;
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pin = &pin_GPIO2;
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break;
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case 1:
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channel = ADC_CH_1;
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pin = &pin_GPIO3;
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break;
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case 2:
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channel = ADC_CH_2;
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pin = &pin_GPIO4;
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break;
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case 3:
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channel = ADC_CH_3;
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pin = &pin_GPIO5;
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break;
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default:
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments));
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break;
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}
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// disable the callback before re-configuring
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pyb_adc_obj_t *self = &pyb_adc_obj[idx];
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self->base.type = &pyb_adc_type;
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self->channel = channel;
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self->idx = idx;
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// configure the pin in analog mode
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pin_config ((pin_obj_t *)pin, PIN_MODE_0, GPIO_DIR_MODE_IN, PYBPIN_ANALOG_TYPE, PIN_STRENGTH_2MA);
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// initialize it
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pybadc_init (self);
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// register it with the sleep module
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pybsleep_add ((const mp_obj_t)self, (WakeUpCB_t)pybadc_init);
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return self;
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}
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/// \method read()
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/// Read the value on the analog pin and return it. The returned value
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/// will be between 0 and 4095.
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STATIC mp_obj_t adc_read(mp_obj_t self_in) {
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pyb_adc_obj_t *self = self_in;
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uint32_t sample;
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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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sample = 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((sample & 0x3FFF) >> 2);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_read_obj, adc_read);
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/// \method enable()
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/// Enable the adc channel
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STATIC mp_obj_t adc_enable(mp_obj_t self_in) {
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pyb_adc_obj_t *self = self_in;
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pybadc_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_enable_obj, adc_enable);
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/// \method disable()
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/// Disable the adc channel
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STATIC mp_obj_t adc_disable(mp_obj_t self_in) {
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pyb_adc_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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pybsleep_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_disable_obj, adc_disable);
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STATIC const mp_map_elem_t adc_locals_dict_table[] = {
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{ MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&adc_read_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_enable), (mp_obj_t)&adc_enable_obj },
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{ MP_OBJ_NEW_QSTR(MP_QSTR_disable), (mp_obj_t)&adc_disable_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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