forked from micropython/micropython
-
Notifications
You must be signed in to change notification settings - Fork 1.2k
/
DigitalInOut.c
178 lines (159 loc) · 6.31 KB
/
DigitalInOut.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
*
* 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 <stdint.h>
#include <string.h>
#include "py/runtime.h"
#include "py/mphal.h"
#include "hal/include/hal_gpio.h"
#include "common-hal/microcontroller/Pin.h"
#include "shared-bindings/digitalio/DigitalInOut.h"
digitalinout_result_t common_hal_digitalio_digitalinout_construct(
digitalio_digitalinout_obj_t* self, const mcu_pin_obj_t* pin) {
claim_pin(pin);
self->pin = pin;
// Must set pull after setting direction.
gpio_set_pin_direction(pin->pin, GPIO_DIRECTION_IN);
gpio_set_pin_pull_mode(pin->pin, GPIO_PULL_OFF);
return DIGITALINOUT_OK;
}
bool common_hal_digitalio_digitalinout_deinited(digitalio_digitalinout_obj_t* self) {
return self->pin == mp_const_none;
}
void common_hal_digitalio_digitalinout_deinit(digitalio_digitalinout_obj_t* self) {
if (common_hal_digitalio_digitalinout_deinited(self)) {
return;
}
reset_pin(self->pin->pin);
self->pin = mp_const_none;
}
void common_hal_digitalio_digitalinout_switch_to_input(
digitalio_digitalinout_obj_t* self, digitalio_pull_t pull) {
self->output = false;
// This also sets direction to input.
common_hal_digitalio_digitalinout_set_pull(self, pull);
}
void common_hal_digitalio_digitalinout_switch_to_output(
digitalio_digitalinout_obj_t* self, bool value,
digitalio_drive_mode_t drive_mode) {
const uint8_t pin = self->pin->pin;
gpio_set_pin_pull_mode(pin, GPIO_PULL_OFF);
// Turn on "strong" pin driving (more current available). See DRVSTR doc in datasheet.
hri_port_set_PINCFG_DRVSTR_bit(PORT, (enum gpio_port)GPIO_PORT(pin), GPIO_PIN(pin));
self->output = true;
self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
// Direction is set in set_value. We don't need to do it here.
common_hal_digitalio_digitalinout_set_value(self, value);
}
digitalio_direction_t common_hal_digitalio_digitalinout_get_direction(
digitalio_digitalinout_obj_t* self) {
return self->output? DIRECTION_OUTPUT : DIRECTION_INPUT;
}
void common_hal_digitalio_digitalinout_set_value(
digitalio_digitalinout_obj_t* self, bool value) {
const uint8_t pin = self->pin->pin;
const uint8_t port = GPIO_PORT(pin);
const uint32_t pin_mask = 1U << GPIO_PIN(pin);
if (value) {
if (self->open_drain) {
// Assertion: pull is off, so the pin is floating in this case.
// We do open-drain high output (no sinking of current)
// by changing the direction to input with no pulls.
hri_port_clear_DIR_DIR_bf(PORT, port, pin_mask);
} else {
hri_port_set_DIR_DIR_bf(PORT, port, pin_mask);
hri_port_set_OUT_OUT_bf(PORT, port, pin_mask);
}
} else {
hri_port_set_DIR_DIR_bf(PORT, port, pin_mask);
hri_port_clear_OUT_OUT_bf(PORT,port, pin_mask);
}
}
bool common_hal_digitalio_digitalinout_get_value(
digitalio_digitalinout_obj_t* self) {
const uint8_t pin = self->pin->pin;
if (!self->output) {
return gpio_get_pin_level(pin);
} else {
if (self->open_drain && hri_port_get_DIR_reg(PORT, GPIO_PORT(pin), 1U << GPIO_PIN(pin)) == 0) {
return true;
} else {
return hri_port_get_OUT_reg(PORT, GPIO_PORT(pin), 1U << GPIO_PIN(pin));
}
}
}
void common_hal_digitalio_digitalinout_set_drive_mode(
digitalio_digitalinout_obj_t* self,
digitalio_drive_mode_t drive_mode) {
bool value = common_hal_digitalio_digitalinout_get_value(self);
self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
// True is implemented differently between modes so reset the value to make
// sure it's correct for the new mode.
if (value) {
common_hal_digitalio_digitalinout_set_value(self, value);
}
}
digitalio_drive_mode_t common_hal_digitalio_digitalinout_get_drive_mode(
digitalio_digitalinout_obj_t* self) {
if (self->open_drain) {
return DRIVE_MODE_OPEN_DRAIN;
} else {
return DRIVE_MODE_PUSH_PULL;
}
}
void common_hal_digitalio_digitalinout_set_pull(
digitalio_digitalinout_obj_t* self, digitalio_pull_t pull) {
enum gpio_pull_mode asf_pull = GPIO_PULL_OFF;
switch (pull) {
case PULL_UP:
asf_pull = GPIO_PULL_UP;
break;
case PULL_DOWN:
asf_pull = GPIO_PULL_DOWN;
break;
case PULL_NONE:
default:
break;
}
// Must set pull after setting direction.
gpio_set_pin_direction(self->pin->pin, GPIO_DIRECTION_IN);
gpio_set_pin_pull_mode(self->pin->pin, asf_pull);
}
digitalio_pull_t common_hal_digitalio_digitalinout_get_pull(
digitalio_digitalinout_obj_t* self) {
uint32_t pin = self->pin->pin;
if (self->output) {
mp_raise_AttributeError("Cannot get pull while in output mode");
return PULL_NONE;
} else {
if (hri_port_get_PINCFG_PULLEN_bit(PORT, GPIO_PORT(pin), GPIO_PIN(pin)) == 0) {
return PULL_NONE;
} if (hri_port_get_OUT_reg(PORT, GPIO_PORT(pin), 1U << GPIO_PIN(pin)) > 0) {
return PULL_UP;
} else {
return PULL_DOWN;
}
}
}