This repository was archived by the owner on Jul 22, 2024. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathKeypad.c
128 lines (111 loc) · 2.96 KB
/
Keypad.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
#include "stm32l476xx.h"
void EXTI_Init(void);
void EXTI1_IRQHandler(void);
void EXTI2_IRQHandler(void);
void EXTI3_IRQHandler(void);
void EXTI4_IRQHandler(void);
extern void Keypad(void);
//Initialize interrupts, based on textbook p. 264
void EXTI_Init(void)
{
RCC -> APB2ENR |= RCC_APB2ENR_SYSCFGEN;
//Set pin 1 of GPIOB as interrupt
SYSCFG->EXTICR[0] &= ~SYSCFG_EXTICR1_EXTI1;
SYSCFG->EXTICR[0] |= SYSCFG_EXTICR1_EXTI1_PB;
SYSCFG->EXTICR[0] &= ~(0x000F);
//Set pin 2 of GPIOB as interrupt
SYSCFG->EXTICR[0] &= ~SYSCFG_EXTICR1_EXTI2;
SYSCFG->EXTICR[0] |= SYSCFG_EXTICR1_EXTI2_PB;
SYSCFG->EXTICR[0] &= ~(0x000F);
//Set pin 3 of GPIOB as interrupt
SYSCFG->EXTICR[0] &= ~SYSCFG_EXTICR1_EXTI3;
SYSCFG->EXTICR[0] |= SYSCFG_EXTICR1_EXTI3_PB;
SYSCFG->EXTICR[0] &= ~(0x000F);
//Set pin 4 of GPIOB as interrupt
SYSCFG->EXTICR[1] &= ~SYSCFG_EXTICR2_EXTI4;
SYSCFG->EXTICR[1] |= SYSCFG_EXTICR2_EXTI4_PB;
//Disable rising edge trigger
EXTI->RTSR1 &= ~EXTI_RTSR1_RT1;
//Enable falling edge trigger
EXTI->FTSR1 |= EXTI_FTSR1_FT1;
//Disable rising edge trigger
EXTI->RTSR1 &= ~EXTI_RTSR1_RT2;
//Enable falling edge trigger
EXTI->FTSR1 |= EXTI_FTSR1_FT2;
//Disable rising edge trigger
EXTI->RTSR1 &= ~EXTI_RTSR1_RT3;
//Enable falling edge trigger
EXTI->FTSR1 |= EXTI_FTSR1_FT3;
//Disable rising edge trigger
EXTI->RTSR1 &= ~EXTI_RTSR1_RT4;
//Enable falling edge trigger
EXTI->FTSR1 |= EXTI_FTSR1_FT4;
//Enable EXTI 1 interrupt
EXTI->IMR1 |= EXTI_IMR1_IM1;
//Set priority to 1
NVIC_SetPriority(EXTI1_IRQn, 1);
//Enable EXTI 1 interrupt
NVIC_EnableIRQ(EXTI1_IRQn);
//Enable EXTI 2 interrupt
EXTI->IMR1 |= EXTI_IMR1_IM2;
//Set priority to 1
NVIC_SetPriority(EXTI2_IRQn, 1);
//Enable EXTI 2 interrupt
NVIC_EnableIRQ(EXTI2_IRQn);
//Enable EXTI 3 interrupt
EXTI->IMR1 |= EXTI_IMR1_IM3;
//Set priority to 1
NVIC_SetPriority(EXTI3_IRQn, 1);
//Enable EXTI 3 interrupt
NVIC_EnableIRQ(EXTI3_IRQn);
//Enable EXTI 4 interrupt
EXTI->IMR1 |= EXTI_IMR1_IM4;
//Set priority to 1
NVIC_SetPriority(EXTI4_IRQn, 1);
//Enable EXTI 4 interrupt
NVIC_EnableIRQ(EXTI4_IRQn);
}
void EXTI1_IRQHandler(void)
{
//check interrupt flag
if((EXTI->PR1 & 0x2) == 0x2)
{
//interrupt code
Keypad();
//Clear interrupt request
EXTI->PR1 |= EXTI_PR1_PIF1;
}
}
void EXTI2_IRQHandler(void)
{
//check interrupt flag
if((EXTI->PR1 & EXTI_PR1_PIF2) == EXTI_PR1_PIF2)
{
//interrupt code
Keypad();
//Clear interrupt request
EXTI->PR1 |= EXTI_PR1_PIF2;
}
}
void EXTI3_IRQHandler(void)
{
//check interrupt flag
if((EXTI->PR1 & EXTI_PR1_PIF3) == EXTI_PR1_PIF3)
{
//interrupt code
Keypad();
//Clear interrupt request
EXTI->PR1 |= EXTI_PR1_PIF3;
}
}
void EXTI4_IRQHandler(void)
{
//check interrupt flag
if((EXTI->PR1 & EXTI_PR1_PIF4) == EXTI_PR1_PIF4)
{
//interrupt code
Keypad();
//Clear interrupt request
EXTI->PR1 |= EXTI_PR1_PIF4;
}
}