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
|
// GPIO functions on stm32f4
//
// Copyright (C) 2019 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <string.h> // ffs
#include "board/irq.h" // irq_save
#include "command.h" // DECL_ENUMERATION_RANGE
#include "gpio.h" // gpio_out_setup
#include "internal.h" // gpio_peripheral
#include "sched.h" // sched_shutdown
DECL_ENUMERATION_RANGE("pin", "PA0", GPIO('A', 0), 16);
DECL_ENUMERATION_RANGE("pin", "PB0", GPIO('B', 0), 16);
DECL_ENUMERATION_RANGE("pin", "PC0", GPIO('C', 0), 16);
#ifdef GPIOD
DECL_ENUMERATION_RANGE("pin", "PD0", GPIO('D', 0), 16);
#endif
#ifdef GPIOE
DECL_ENUMERATION_RANGE("pin", "PE0", GPIO('E', 0), 16);
#endif
#ifdef GPIOF
DECL_ENUMERATION_RANGE("pin", "PF0", GPIO('F', 0), 16);
#endif
#ifdef GPIOG
DECL_ENUMERATION_RANGE("pin", "PG0", GPIO('G', 0), 16);
#endif
#ifdef GPIOH
DECL_ENUMERATION_RANGE("pin", "PH0", GPIO('H', 0), 16);
#endif
#ifdef GPIOI
DECL_ENUMERATION_RANGE("pin", "PI0", GPIO('I', 0), 16);
#endif
GPIO_TypeDef * const digital_regs[] = {
['A' - 'A'] = GPIOA, GPIOB, GPIOC,
#ifdef GPIOD
['D' - 'A'] = GPIOD,
#endif
#ifdef GPIOE
['E' - 'A'] = GPIOE,
#endif
#ifdef GPIOF
['F' - 'A'] = GPIOF,
#endif
#ifdef GPIOG
['G' - 'A'] = GPIOG,
#endif
#ifdef GPIOH
['H' - 'A'] = GPIOH,
#endif
#ifdef GPIOI
['I' - 'A'] = GPIOI,
#endif
};
// Convert a register and bit location back to an integer pin identifier
static int
regs_to_pin(GPIO_TypeDef *regs, uint32_t bit)
{
int i;
for (i=0; i<ARRAY_SIZE(digital_regs); i++)
if (digital_regs[i] == regs)
return GPIO('A' + i, ffs(bit)-1);
return 0;
}
// Verify that a gpio is a valid pin
static int
gpio_valid(uint32_t pin)
{
uint32_t port = GPIO2PORT(pin);
return port < ARRAY_SIZE(digital_regs) && digital_regs[port];
}
struct gpio_out
gpio_out_setup(uint32_t pin, uint32_t val)
{
if (!gpio_valid(pin))
shutdown("Not an output pin");
GPIO_TypeDef *regs = digital_regs[GPIO2PORT(pin)];
gpio_clock_enable(regs);
struct gpio_out g = { .regs=regs, .bit=GPIO2BIT(pin) };
gpio_out_reset(g, val);
return g;
}
void
gpio_out_reset(struct gpio_out g, uint32_t val)
{
GPIO_TypeDef *regs = g.regs;
int pin = regs_to_pin(regs, g.bit);
irqstatus_t flag = irq_save();
if (val)
regs->BSRR = g.bit;
else
regs->BSRR = g.bit << 16;
gpio_peripheral(pin, GPIO_OUTPUT, 0);
irq_restore(flag);
}
void
gpio_out_toggle_noirq(struct gpio_out g)
{
GPIO_TypeDef *regs = g.regs;
regs->ODR ^= g.bit;
}
void
gpio_out_toggle(struct gpio_out g)
{
irqstatus_t flag = irq_save();
gpio_out_toggle_noirq(g);
irq_restore(flag);
}
void
gpio_out_write(struct gpio_out g, uint32_t val)
{
GPIO_TypeDef *regs = g.regs;
if (val)
regs->BSRR = g.bit;
else
regs->BSRR = g.bit << 16;
}
struct gpio_in
gpio_in_setup(uint32_t pin, int32_t pull_up)
{
if (!gpio_valid(pin))
shutdown("Not a valid input pin");
GPIO_TypeDef *regs = digital_regs[GPIO2PORT(pin)];
struct gpio_in g = { .regs=regs, .bit=GPIO2BIT(pin) };
gpio_in_reset(g, pull_up);
return g;
}
void
gpio_in_reset(struct gpio_in g, int32_t pull_up)
{
GPIO_TypeDef *regs = g.regs;
int pin = regs_to_pin(regs, g.bit);
irqstatus_t flag = irq_save();
gpio_peripheral(pin, GPIO_INPUT, pull_up);
irq_restore(flag);
}
uint8_t
gpio_in_read(struct gpio_in g)
{
GPIO_TypeDef *regs = g.regs;
return !!(regs->IDR & g.bit);
}
|
