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interrupt.c
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interrupt.c
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#include "interrupt.h"
irp_callback_fun irp_callback_array[32];
void interrupt_init() {
// 启用 EINT0 EINT2 EINT11 中断
INTMSK &= ~((1 << 0) | (1 << 2) | (1 << 5));
}
void key_interrupt_init() {
// 设置 GPF0 EINT0 GPF2 EINT2 为中断模式
GPFCON |= ((0x2 << 0) | (0x2 << 4));
// 设置 GPG3 EINT11 为中断模式
GPGCON |= (0x2 << 6);
// 设置 GPF0 EINT0 GPF2 EINT2 为双边沿触发
EXTINT0 |= (0x7) | (0x7 << 8);
// 设置 GPG3 EINT11 为双边沿触发
EXTINT1 |= (0x7 << 12);
// 使能 EINT11 中断
EINTMASK &= ~(1 << 11);
// EINTPEND 中断挂起寄存器
// 注册中断
register_irq(0, key_handler);
register_irq(2, key_handler);
register_irq(5, key_handler);
}
void interrupt_handler() {
// 得到中断偏移值
unsigned int offset = INTOFFSET;
// 调用中断处理函数
irp_callback_array[offset](offset);
// 清除中断标志位
SRCPND |= (1 << offset);
INTPND |= (1 << offset);
}
void key_handler(unsigned int offset) {
unsigned int val = EINTPEND;
if (offset == 0) {
// 按键 0
if (GPFDAT & 0x1) // high
{
puts("key0 release\r\n");
print_hex(TCNTO4);
} else {
puts("key0 enter\r\n");
}
} else if (offset == 2) {
// 按键 2
if ((GPFDAT >> 2) & 0x1) // high
{
int temp, hum;
puts("key2 release\r\n");
} else {
puts("key2 enter\r\n");
}
} else if (offset == 5) {
if ((val >> 11) & 0x1) {
if ((GPGDAT >> 3) & 0x1) // high
{
puts("key11 release\r\n");
// spi_test();
} else {
puts("key11 enter\r\n");
}
}
}
// 写一清除中断标志位
EINTPEND = val;
}
void register_irq(unsigned int irq, irp_callback_fun p) {
// 使能中断
INTMSK &= ~((1 << irq));
irp_callback_array[irq] = p;
}
void disable_irq() {
asm(
"mrs r0, cpsr\n\r"
"orr r0, r0, #0x80\n\r"
"msr cpsr, r0\n\r"
);
}
void enable_irq() {
asm(
"mrs r0, cpsr\n\r"
"bic r0, r0, #0x80\n\r"
"msr cpsr, r0\n\r"
);
}