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micropython/esp8266/machine_pin.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014, 2015 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 <stdio.h>
#include <stdint.h>
#include <string.h>
#include "etshal.h"
#include "c_types.h"
#include "user_interface.h"
#include "gpio.h"
#include "py/nlr.h"
#include "py/runtime.h"
#include "py/gc.h"
#include "py/mphal.h"
#include "extmod/virtpin.h"
#include "modmachine.h"
#define GET_TRIGGER(phys_port) \
GPIO_PIN_INT_TYPE_GET(GPIO_REG_READ(GPIO_PIN_ADDR(phys_port)))
#define SET_TRIGGER(phys_port, trig) \
(GPIO_REG_WRITE(GPIO_PIN_ADDR(phys_port), \
(GPIO_REG_READ(GPIO_PIN_ADDR(phys_port)) & ~GPIO_PIN_INT_TYPE_MASK) \
| GPIO_PIN_INT_TYPE_SET(trig))) \
#define GPIO_MODE_INPUT (0)
#define GPIO_MODE_OUTPUT (1)
#define GPIO_MODE_OPEN_DRAIN (2) // synthesised
#define GPIO_PULL_NONE (0)
#define GPIO_PULL_UP (1)
// Removed in SDK 1.1.0
//#define GPIO_PULL_DOWN (2)
typedef struct _pin_irq_obj_t {
mp_obj_base_t base;
uint16_t phys_port;
} pin_irq_obj_t;
const pyb_pin_obj_t pyb_pin_obj[16 + 1] = {
{{&pyb_pin_type}, 0, FUNC_GPIO0, PERIPHS_IO_MUX_GPIO0_U},
{{&pyb_pin_type}, 1, FUNC_GPIO1, PERIPHS_IO_MUX_U0TXD_U},
{{&pyb_pin_type}, 2, FUNC_GPIO2, PERIPHS_IO_MUX_GPIO2_U},
{{&pyb_pin_type}, 3, FUNC_GPIO3, PERIPHS_IO_MUX_U0RXD_U},
{{&pyb_pin_type}, 4, FUNC_GPIO4, PERIPHS_IO_MUX_GPIO4_U},
{{&pyb_pin_type}, 5, FUNC_GPIO5, PERIPHS_IO_MUX_GPIO5_U},
{{NULL}, 0, 0, 0},
{{NULL}, 0, 0, 0},
{{NULL}, 0, 0, 0},
{{&pyb_pin_type}, 9, FUNC_GPIO9, PERIPHS_IO_MUX_SD_DATA2_U},
{{&pyb_pin_type}, 10, FUNC_GPIO10, PERIPHS_IO_MUX_SD_DATA3_U},
{{NULL}, 0, 0, 0},
{{&pyb_pin_type}, 12, FUNC_GPIO12, PERIPHS_IO_MUX_MTDI_U},
{{&pyb_pin_type}, 13, FUNC_GPIO13, PERIPHS_IO_MUX_MTCK_U},
{{&pyb_pin_type}, 14, FUNC_GPIO14, PERIPHS_IO_MUX_MTMS_U},
{{&pyb_pin_type}, 15, FUNC_GPIO15, PERIPHS_IO_MUX_MTDO_U},
// GPIO16 is special, belongs to different register set, and
// otherwise handled specially.
{{&pyb_pin_type}, 16, -1, -1},
};
STATIC uint8_t pin_mode[16 + 1];
// forward declaration
STATIC const pin_irq_obj_t pin_irq_obj[16];
void pin_init0(void) {
ETS_GPIO_INTR_DISABLE();
ETS_GPIO_INTR_ATTACH(pin_intr_handler_iram, NULL);
// disable all interrupts
memset(&MP_STATE_PORT(pin_irq_handler)[0], 0, 16 * sizeof(mp_obj_t));
for (int p = 0; p < 16; ++p) {
GPIO_REG_WRITE(GPIO_STATUS_W1TC_ADDRESS, 1 << p);
SET_TRIGGER(p, 0);
}
ETS_GPIO_INTR_ENABLE();
}
void pin_intr_handler(uint32_t status) {
gc_lock();
status &= 0xffff;
for (int p = 0; status; ++p, status >>= 1) {
if (status & 1) {
mp_obj_t handler = MP_STATE_PORT(pin_irq_handler)[p];
if (handler != MP_OBJ_NULL) {
mp_call_function_1_protected(handler, MP_OBJ_FROM_PTR(&pyb_pin_obj[p]));
}
}
}
gc_unlock();
}
pyb_pin_obj_t *mp_obj_get_pin_obj(mp_obj_t pin_in) {
if (mp_obj_get_type(pin_in) != &pyb_pin_type) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "expecting a pin"));
}
pyb_pin_obj_t *self = pin_in;
return self;
}
uint mp_obj_get_pin(mp_obj_t pin_in) {
return mp_obj_get_pin_obj(pin_in)->phys_port;
}
void mp_hal_pin_input(mp_hal_pin_obj_t pin_id) {
pin_mode[pin_id] = GPIO_MODE_INPUT;
if (pin_id == 16) {
WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1);
WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1);
WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1)); // input
} else {
const pyb_pin_obj_t *self = &pyb_pin_obj[pin_id];
PIN_FUNC_SELECT(self->periph, self->func);
PIN_PULLUP_DIS(self->periph);
gpio_output_set(0, 0, 0, 1 << self->phys_port);
}
}
void mp_hal_pin_output(mp_hal_pin_obj_t pin_id) {
pin_mode[pin_id] = GPIO_MODE_OUTPUT;
if (pin_id == 16) {
WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1);
WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1);
WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1) | 1); // output
} else {
const pyb_pin_obj_t *self = &pyb_pin_obj[pin_id];
PIN_FUNC_SELECT(self->periph, self->func);
PIN_PULLUP_DIS(self->periph);
gpio_output_set(0, 0, 1 << self->phys_port, 0);
}
}
int pin_get(uint pin) {
if (pin == 16) {
return READ_PERI_REG(RTC_GPIO_IN_DATA) & 1;
}
return GPIO_INPUT_GET(pin);
}
void pin_set(uint pin, int value) {
if (pin == 16) {
int out_en = (pin_mode[pin] == GPIO_MODE_OUTPUT);
WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1);
WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1);
WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1) | out_en);
WRITE_PERI_REG(RTC_GPIO_OUT, (READ_PERI_REG(RTC_GPIO_OUT) & ~1) | value);
return;
}
uint32_t enable = 0;
uint32_t disable = 0;
switch (pin_mode[pin]) {
case GPIO_MODE_INPUT:
value = -1;
disable = 1;
break;
case GPIO_MODE_OUTPUT:
enable = 1;
break;
case GPIO_MODE_OPEN_DRAIN:
if (value == -1) {
return;
} else if (value == 0) {
enable = 1;
} else {
value = -1;
disable = 1;
}
break;
}
enable <<= pin;
disable <<= pin;
if (value == -1) {
gpio_output_set(0, 0, enable, disable);
} else {
gpio_output_set(value << pin, (1 - value) << pin, enable, disable);
}
}
STATIC void pyb_pin_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
pyb_pin_obj_t *self = self_in;
// pin name
mp_printf(print, "Pin(%u)", self->phys_port);
}
// pin.init(mode, pull=None, *, value)
STATIC mp_obj_t pyb_pin_obj_init_helper(pyb_pin_obj_t *self, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_mode, ARG_pull, ARG_value };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_mode, MP_ARG_REQUIRED | MP_ARG_INT },
{ MP_QSTR_pull, MP_ARG_OBJ, {.u_obj = mp_const_none}},
{ MP_QSTR_value, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL}},
};
// parse args
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// get io mode
uint mode = args[ARG_mode].u_int;
// get pull mode
uint pull = GPIO_PULL_NONE;
if (args[ARG_pull].u_obj != mp_const_none) {
pull = mp_obj_get_int(args[ARG_pull].u_obj);
}
// get initial value
int value;
if (args[ARG_value].u_obj == MP_OBJ_NULL) {
value = -1;
} else {
value = mp_obj_is_true(args[ARG_value].u_obj);
}
// save the mode
pin_mode[self->phys_port] = mode;
// configure the GPIO as requested
if (self->phys_port == 16) {
// only pull-down seems to be supported by the hardware, and
// we only expose pull-up behaviour in software
if (pull != GPIO_PULL_NONE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "Pin(16) doesn't support pull"));
}
} else {
PIN_FUNC_SELECT(self->periph, self->func);
#if 0
// Removed in SDK 1.1.0
if ((pull & GPIO_PULL_DOWN) == 0) {
PIN_PULLDWN_DIS(self->periph);
}
#endif
if ((pull & GPIO_PULL_UP) == 0) {
PIN_PULLUP_DIS(self->periph);
}
#if 0
if ((pull & GPIO_PULL_DOWN) != 0) {
PIN_PULLDWN_EN(self->periph);
}
#endif
if ((pull & GPIO_PULL_UP) != 0) {
PIN_PULLUP_EN(self->periph);
}
}
pin_set(self->phys_port, value);
return mp_const_none;
}
// constructor(id, ...)
STATIC mp_obj_t pyb_pin_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
// get the wanted pin object
int wanted_pin = mp_obj_get_int(args[0]);
pyb_pin_obj_t *pin = NULL;
if (0 <= wanted_pin && wanted_pin < MP_ARRAY_SIZE(pyb_pin_obj)) {
pin = (pyb_pin_obj_t*)&pyb_pin_obj[wanted_pin];
}
if (pin == NULL || pin->base.type == NULL) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "invalid pin"));
}
if (n_args > 1 || n_kw > 0) {
// pin mode given, so configure this GPIO
mp_map_t kw_args;
mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
pyb_pin_obj_init_helper(pin, n_args - 1, args + 1, &kw_args);
}
return (mp_obj_t)pin;
}
// fast method for getting/setting pin value
STATIC mp_obj_t pyb_pin_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 0, 1, false);
pyb_pin_obj_t *self = self_in;
if (n_args == 0) {
// get pin
return MP_OBJ_NEW_SMALL_INT(pin_get(self->phys_port));
} else {
// set pin
pin_set(self->phys_port, mp_obj_is_true(args[0]));
return mp_const_none;
}
}
// pin.init(mode, pull)
STATIC mp_obj_t pyb_pin_obj_init(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
return pyb_pin_obj_init_helper(args[0], n_args - 1, args + 1, kw_args);
}
MP_DEFINE_CONST_FUN_OBJ_KW(pyb_pin_init_obj, 1, pyb_pin_obj_init);
// pin.value([value])
STATIC mp_obj_t pyb_pin_value(mp_uint_t n_args, const mp_obj_t *args) {
return pyb_pin_call(args[0], n_args - 1, 0, args + 1);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_pin_value_obj, 1, 2, pyb_pin_value);
// pin.low()
STATIC mp_obj_t pyb_pin_low(mp_obj_t self_in) {
pyb_pin_obj_t *self = self_in;
pin_set(self->phys_port, 0);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_pin_low_obj, pyb_pin_low);
// pin.high()
STATIC mp_obj_t pyb_pin_high(mp_obj_t self_in) {
pyb_pin_obj_t *self = self_in;
pin_set(self->phys_port, 1);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_pin_high_obj, pyb_pin_high);
// pin.irq(*, trigger, handler=None)
STATIC mp_obj_t pyb_pin_irq(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_trigger, ARG_handler };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_trigger, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_handler, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
};
pyb_pin_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
if (self->phys_port >= 16) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "pin does not have IRQ capabilities"));
}
if (args[ARG_trigger].u_int != 0) {
// configure irq
mp_obj_t handler = args[ARG_handler].u_obj;
if (handler == mp_const_none) {
handler = MP_OBJ_NULL;
}
ETS_GPIO_INTR_DISABLE();
MP_STATE_PORT(pin_irq_handler)[self->phys_port] = handler;
SET_TRIGGER(self->phys_port, args[ARG_trigger].u_int);
GPIO_REG_WRITE(GPIO_STATUS_W1TC_ADDRESS, 1 << self->phys_port);
ETS_GPIO_INTR_ENABLE();
}
// return the irq object
return MP_OBJ_FROM_PTR(&pin_irq_obj[self->phys_port]);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_pin_irq_obj, 1, pyb_pin_irq);
STATIC mp_uint_t pin_ioctl(mp_obj_t self_in, mp_uint_t request, uintptr_t arg, int *errcode);
STATIC mp_uint_t pin_ioctl(mp_obj_t self_in, mp_uint_t request, uintptr_t arg, int *errcode) {
(void)errcode;
pyb_pin_obj_t *self = self_in;
switch (request) {
case MP_PIN_READ: {
return pin_get(self->phys_port);
}
case MP_PIN_WRITE: {
pin_set(self->phys_port, arg);
return 0;
}
}
return -1;
}
STATIC const mp_map_elem_t pyb_pin_locals_dict_table[] = {
// instance methods
{ MP_OBJ_NEW_QSTR(MP_QSTR_init), (mp_obj_t)&pyb_pin_init_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_value), (mp_obj_t)&pyb_pin_value_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_low), (mp_obj_t)&pyb_pin_low_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_high), (mp_obj_t)&pyb_pin_high_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_irq), (mp_obj_t)&pyb_pin_irq_obj },
// class constants
{ MP_OBJ_NEW_QSTR(MP_QSTR_IN), MP_OBJ_NEW_SMALL_INT(GPIO_MODE_INPUT) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_OUT), MP_OBJ_NEW_SMALL_INT(GPIO_MODE_OUTPUT) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_OPEN_DRAIN), MP_OBJ_NEW_SMALL_INT(GPIO_MODE_OPEN_DRAIN) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_PULL_UP), MP_OBJ_NEW_SMALL_INT(GPIO_PULL_UP) },
//{ MP_OBJ_NEW_QSTR(MP_QSTR_PULL_DOWN), MP_OBJ_NEW_SMALL_INT(GPIO_PULL_DOWN) },
// IRG triggers, can be or'd together
{ MP_OBJ_NEW_QSTR(MP_QSTR_IRQ_RISING), MP_OBJ_NEW_SMALL_INT(GPIO_PIN_INTR_POSEDGE) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_IRQ_FALLING), MP_OBJ_NEW_SMALL_INT(GPIO_PIN_INTR_NEGEDGE) },
};
STATIC MP_DEFINE_CONST_DICT(pyb_pin_locals_dict, pyb_pin_locals_dict_table);
STATIC const mp_pin_p_t pin_pin_p = {
.ioctl = pin_ioctl,
};
const mp_obj_type_t pyb_pin_type = {
{ &mp_type_type },
.name = MP_QSTR_Pin,
.print = pyb_pin_print,
.make_new = pyb_pin_make_new,
.call = pyb_pin_call,
.protocol = &pin_pin_p,
.locals_dict = (mp_obj_t)&pyb_pin_locals_dict,
};
/******************************************************************************/
// Pin IRQ object
STATIC const mp_obj_type_t pin_irq_type;
STATIC const pin_irq_obj_t pin_irq_obj[16] = {
{{&pin_irq_type}, 0},
{{&pin_irq_type}, 1},
{{&pin_irq_type}, 2},
{{&pin_irq_type}, 3},
{{&pin_irq_type}, 4},
{{&pin_irq_type}, 5},
{{&pin_irq_type}, 6},
{{&pin_irq_type}, 7},
{{&pin_irq_type}, 8},
{{&pin_irq_type}, 9},
{{&pin_irq_type}, 10},
{{&pin_irq_type}, 11},
{{&pin_irq_type}, 12},
{{&pin_irq_type}, 13},
{{&pin_irq_type}, 14},
{{&pin_irq_type}, 15},
};
STATIC mp_obj_t pin_irq_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
pin_irq_obj_t *self = self_in;
mp_arg_check_num(n_args, n_kw, 0, 0, false);
pin_intr_handler(1 << self->phys_port);
return mp_const_none;
}
STATIC mp_obj_t pin_irq_trigger(size_t n_args, const mp_obj_t *args) {
pin_irq_obj_t *self = args[0];
uint32_t orig_trig = GET_TRIGGER(self->phys_port);
if (n_args == 2) {
// set trigger
SET_TRIGGER(self->phys_port, mp_obj_get_int(args[1]));
}
// return original trigger value
return MP_OBJ_NEW_SMALL_INT(orig_trig);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pin_irq_trigger_obj, 1, 2, pin_irq_trigger);
STATIC const mp_rom_map_elem_t pin_irq_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_trigger), MP_ROM_PTR(&pin_irq_trigger_obj) },
};
STATIC MP_DEFINE_CONST_DICT(pin_irq_locals_dict, pin_irq_locals_dict_table);
STATIC const mp_obj_type_t pin_irq_type = {
{ &mp_type_type },
.name = MP_QSTR_IRQ,
.call = pin_irq_call,
.locals_dict = (mp_obj_dict_t*)&pin_irq_locals_dict,
};
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