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Commit 7027fd53 authored by Daniel Campora's avatar Daniel Campora
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cc3200: Make ADC API compatible with the pyboard.

parent 7da2fdc3
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cc3200/mods/pybadc.c
View file @ 7027fd53
......@@ -57,10 +57,8 @@
///
/// Usage:
///
/// adc = pyb.ADC(channel) # create an adc object on the given channel (1 to 4)
/// this automatically configures the pin associated to
/// that analog channel.
/// adc.read() # read channel value
/// adc = pyb.ADC('GP5') # create an adc object on the given pin (GP2, GP3, GP4 o GP5)
/// adc.read() # read channel value
///
/// The sample rate is fixed to 62.5KHz and the resolution to 12 bits.
......@@ -75,14 +73,23 @@
******************************************************************************/
typedef struct {
mp_obj_base_t base;
pin_obj_t *pin;
byte channel;
byte idx;
byte id;
} pyb_adc_obj_t;
/******************************************************************************
DECLARE PRIVATE DATA
******************************************************************************/
STATIC pyb_adc_obj_t pyb_adc_obj[PYB_ADC_NUM_CHANNELS] = { {.pin = &pin_GP2, .channel = ADC_CH_0, .id = 1}, {.pin = &pin_GP3, .channel = ADC_CH_1, .id = 2},
{.pin = &pin_GP4, .channel = ADC_CH_2, .id = 2}, {.pin = &pin_GP5, .channel = ADC_CH_3, .id = 4} };
/******************************************************************************
DEFINE PUBLIC FUNCTIONS
******************************************************************************/
STATIC void pybadc_init (pyb_adc_obj_t *self) {
// configure the pin in analog mode
pin_config (self->pin, PIN_MODE_0, GPIO_DIR_MODE_IN, PYBPIN_ANALOG_TYPE, PIN_STRENGTH_2MA);
// enable the ADC channel
MAP_ADCChannelEnable(ADC_BASE, self->channel);
// enable and configure the timer
......@@ -92,68 +99,34 @@ STATIC void pybadc_init (pyb_adc_obj_t *self) {
MAP_ADCEnable(ADC_BASE);
}
/******************************************************************************
DECLARE PRIVATE DATA
******************************************************************************/
STATIC pyb_adc_obj_t pyb_adc_obj[PYB_ADC_NUM_CHANNELS];
/******************************************************************************/
/* Micro Python 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;
mp_printf(print, "<ADC, channel=%u>", (self->idx + 1));
mp_printf(print, "<ADC1 channel=%u on %q>", self->id, self->pin->name);
}
/// \classmethod \constructor(channel)
/// Create an ADC object associated with the given channel.
/// \classmethod \constructor(pin)
/// Create an ADC object associated with the given pin.
/// 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
int32_t idx = mp_obj_get_int(args[0]) - 1;
const pin_obj_t *pin;
uint channel;
switch (idx) {
case 0:
channel = ADC_CH_0;
pin = &pin_GP2;
break;
case 1:
channel = ADC_CH_1;
pin = &pin_GP3;
break;
case 2:
channel = ADC_CH_2;
pin = &pin_GP4;
break;
case 3:
channel = ADC_CH_3;
pin = &pin_GP5;
break;
default:
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments));
break;
// the argument passed is the pin
const pin_obj_t *pin = (pin_obj_t *)pin_find(args[0]);
for (int32_t idx = 0; idx < PYB_ADC_NUM_CHANNELS; idx++) {
if (pin == pyb_adc_obj[idx].pin) {
pyb_adc_obj_t *self = &pyb_adc_obj[idx];
self->base.type = &pyb_adc_type;
pybadc_init (self);
// register it with the sleep module
pybsleep_add ((const mp_obj_t)self, (WakeUpCB_t)pybadc_init);
return self;
}
}
// disable the callback before re-configuring
pyb_adc_obj_t *self = &pyb_adc_obj[idx];
self->base.type = &pyb_adc_type;
self->channel = channel;
self->idx = idx;
// configure the pin in analog mode
pin_config ((pin_obj_t *)pin, PIN_MODE_0, GPIO_DIR_MODE_IN, PYBPIN_ANALOG_TYPE, PIN_STRENGTH_2MA);
// initialize it
pybadc_init (self);
// register it with the sleep module
pybsleep_add ((const mp_obj_t)self, (WakeUpCB_t)pybadc_init);
return self;
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments));
}
/// \method read()
......@@ -172,19 +145,19 @@ STATIC mp_obj_t adc_read(mp_obj_t self_in) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_read_obj, adc_read);
/// \method enable()
/// \method init()
/// Enable the adc channel
STATIC mp_obj_t adc_enable(mp_obj_t self_in) {
STATIC mp_obj_t adc_init(mp_obj_t self_in) {
pyb_adc_obj_t *self = self_in;
pybadc_init(self);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_enable_obj, adc_enable);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_init_obj, adc_init);
/// \method disable()
/// \method deinit()
/// Disable the adc channel
STATIC mp_obj_t adc_disable(mp_obj_t self_in) {
STATIC mp_obj_t adc_deinit(mp_obj_t self_in) {
pyb_adc_obj_t *self = self_in;
MAP_ADCChannelDisable(ADC_BASE, self->channel);
......@@ -192,12 +165,12 @@ STATIC mp_obj_t adc_disable(mp_obj_t self_in) {
pybsleep_remove ((const mp_obj_t)self);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_disable_obj, adc_disable);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_deinit_obj, adc_deinit);
STATIC const mp_map_elem_t adc_locals_dict_table[] = {
{ 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 },
{ MP_OBJ_NEW_QSTR(MP_QSTR_init), (mp_obj_t)&adc_init_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_deinit), (mp_obj_t)&adc_deinit_obj },
};
STATIC MP_DEFINE_CONST_DICT(adc_locals_dict, adc_locals_dict_table);
......
cc3200/qstrdefsport.h
View file @ 7027fd53
......@@ -182,6 +182,8 @@ Q(MASTER)
// for ADC class
Q(ADC)
Q(read)
Q(init)
Q(deinit)
#if MICROPY_HW_HAS_SDCARD
// for SD class
......
docs/library/pyb.ADC.rst
View file @ 7027fd53
......@@ -24,8 +24,10 @@ class ADC -- analog to digital conversion: read analog values on a pin
import pyb
adc = pyb.ADC(channel) # create an analog object on one of the 4 ADC channels
adc = pyb.ADC(pin) # create an analog object on one of the 4 ADC channels
val = adc.read() # read an analog value
adc.deinit() # disable the adc channel
adc.init() # enable the adc channel
Constructors
------------
......@@ -39,13 +41,13 @@ Constructors
.. only:: port_wipy
.. class:: pyb.ADC(channel)
.. class:: pyb.ADC(pin)
Create an ADC object on the given channel. Each channel is associated
to a specific pin. For more info check the `pinout and alternate functions
table. <https://raw.githubusercontent.com/wipy/wipy/master/docs/PinOUT.png>`_
Create an ADC object associated with the given pin.
This allows you to then read analog values on that pin.
For more info check the `pinout and alternate functions
table. <https://raw.githubusercontent.com/wipy/wipy/master/docs/PinOUT.png>`_
.. warning::
ADC pin input range is 0-1.4V (being 1.8V the absolute maximum that it
......@@ -100,10 +102,10 @@ Methods
.. only:: port_wipy
.. method:: adc.enable()
.. method:: adc.init()
Enable the ADC channel.
.. method:: adc.disable()
.. method:: adc.deinit()
Disable the ADC channel.
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