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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/******************************************************************************
* The MIT License
*
* Copyright (c) 2011 LeafLabs, LLC.
*
* 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.
*****************************************************************************/
/**
* @file libmaple/stm32f2-f4/gpio.c
* @brief STM32F2 GPIO.
*/
#include <libmaple/gpio.h>
#include <libmaple/rcc.h>
#include <libmaple/bitband.h>
/*
* GPIO devices
*/
gpio_dev gpioa = {
.regs = GPIOA_BASE,
.clk_id = RCC_GPIOA,
.exti_port = EXTI_PA,
};
/** GPIO port A device. */
gpio_dev* const GPIOA = &gpioa;
gpio_dev gpiob = {
.regs = GPIOB_BASE,
.clk_id = RCC_GPIOB,
.exti_port = EXTI_PB,
};
/** GPIO port B device. */
gpio_dev* const GPIOB = &gpiob;
gpio_dev gpioc = {
.regs = GPIOC_BASE,
.clk_id = RCC_GPIOC,
.exti_port = EXTI_PC,
};
/** GPIO port C device. */
gpio_dev* const GPIOC = &gpioc;
gpio_dev gpiod = {
.regs = GPIOD_BASE,
.clk_id = RCC_GPIOD,
.exti_port = EXTI_PD,
};
/** GPIO port D device. */
gpio_dev* const GPIOD = &gpiod;
gpio_dev gpioe = {
.regs = GPIOE_BASE,
.clk_id = RCC_GPIOE,
.exti_port = EXTI_PE,
};
/** GPIO port E device. */
gpio_dev* const GPIOE = &gpioe;
gpio_dev gpiof = {
.regs = GPIOF_BASE,
.clk_id = RCC_GPIOF,
.exti_port = EXTI_PF,
};
/** GPIO port F device. */
gpio_dev* const GPIOF = &gpiof;
gpio_dev gpiog = {
.regs = GPIOG_BASE,
.clk_id = RCC_GPIOG,
.exti_port = EXTI_PG,
};
/** GPIO port G device. */
gpio_dev* const GPIOG = &gpiog;
gpio_dev gpioh = {
.regs = GPIOH_BASE,
.clk_id = RCC_GPIOH,
.exti_port = EXTI_PH,
};
/** GPIO port G device. */
gpio_dev* const GPIOH = &gpioh;
gpio_dev gpioi = {
.regs = GPIOI_BASE,
.clk_id = RCC_GPIOI,
.exti_port = EXTI_PI,
};
/** GPIO port G device. */
gpio_dev* const GPIOI = &gpioi;
/*
* GPIO routines
*/
/**
* Initialize and reset all available GPIO devices.
*/
void gpio_init_all(void) {
gpio_init(GPIOA);
gpio_init(GPIOB);
gpio_init(GPIOC);
gpio_init(GPIOD);
gpio_init(GPIOE);
gpio_init(GPIOF);
gpio_init(GPIOG);
gpio_init(GPIOH);
gpio_init(GPIOI);
}
/**
* @brief Set the mode of a GPIO pin.
* @param dev GPIO device.
* @param bit Bit on dev whose mode to set, 0--15.
* @param mode Mode to set the pin to.
* @param flags Flags to modify basic mode configuration
*/
void gpio_set_modef(gpio_dev *dev,
uint8 bit,
gpio_pin_mode mode,
unsigned flags) {
gpio_reg_map *regs = dev->regs;
unsigned shift = bit * 2;
uint32 tmp;
/* Mode */
tmp = regs->MODER;
tmp &= ~(0x3 << shift);
tmp |= mode << shift;
regs->MODER = tmp;
/* Output type */
bb_peri_set_bit(®s->OTYPER, bit, flags & 0x1);
/* Speed */
tmp = regs->OSPEEDR;
tmp &= ~(0x3 << shift);
tmp |= ((flags >> 1) & 0x3) << shift;
regs->OSPEEDR = tmp;
/* Pull-up/pull-down */
tmp = regs->PUPDR;
tmp &= ~(0x3 << shift);
tmp |= ((flags >> 3) & 0x3) << shift;
regs->PUPDR = tmp;
}
/**
* @brief Set a pin's alternate function.
*
* The pin must have its mode set to GPIO_MODE_AF for this to take
* effect.
*
* @param dev Device whose pin to configure.
* @param bit Pin whose alternate function to set.
* @param af Alternate function to use for pin.
* @see gpio_set_modef()
*/
void gpio_set_af(gpio_dev *dev, uint8 bit, gpio_af af) {
__io uint32 *afr;
unsigned shift;
uint32 tmp;
if (bit >= 8) {
afr = &dev->regs->AFRH;
shift = 4 * (bit - 8);
} else{
afr = &dev->regs->AFRL;
shift = 4 * bit;
}
tmp = *afr;
tmp &= ~(0xF << shift);
tmp |= (af << shift);
*afr = tmp;
}
|
