中断处理（串口中断）

来源：互联网发布：订房软件编辑：程序博客网时间：2024/05/29 10:57

#define GPNCON (*((volatile unsigned long *)0x7F008830))
#define GPNDAT (*((volatile unsigned long *)0x7F008834))

#define EINT0CON0 (*((volatile unsigned long *)0x7F008900))
#define EINT0MASK (*((volatile unsigned long *)0x7F008920))

#define EINT0PEND (*((volatile unsigned long *)0x7F008924))

#define PRIORITY (*((volatile unsigned long *)0x7F008280))
#define SERVICE (*((volatile unsigned long *)0x7F008284))
#define SERVICEPEND (*((volatile unsigned long *)0x7F008288))

#define VIC0IRQSTATUS (*((volatile unsigned long *)0x71200000))
#define VIC0FIQSTATUS (*((volatile unsigned long *)0x71200004))
#define VIC0RAWINTR (*((volatile unsigned long *)0x71200008))
#define VIC0INTSELECT (*((volatile unsigned long *)0x7120000c))
#define VIC0INTENABLE (*((volatile unsigned long *)0x71200010))
#define VIC0INTENCLEAR (*((volatile unsigned long *)0x71200014))
#define VIC0PROTECTION (*((volatile unsigned long *)0x71200020))
#define VIC0SWPRIORITYMASK (*((volatile unsigned long *)0x71200024))
#define VIC0PRIORITYDAISY (*((volatile unsigned long *)0x71200028))

#define VIC0VECTADDR0      (*((volatile unsigned long *)0x71200100))
#define VIC0VECTADDR1      (*((volatile unsigned long *)0x71200104))
#define VIC0ADDRESS        (*((volatile unsigned long *)0x71200f00))

#define VIC1IRQSTATUS (*((volatile unsigned long *)0x71300000))
#define VIC1VECTADDR5 (*((volatile unsigned long *)0x71300114))
#define VIC1INTENABLE (*((volatile unsigned long *)0x71300010))
#define VIC1ADDRESS (*((volatile unsigned long *)0x71300f00))

void eint0_3_irq(void)
{
int i;

printf("eint0_3_irq\n\r"); /* K1~K4 */
for (i = 0; i < 4; i ++)
{
  if (EINT0PEND & (1<<i))
  {
   if (GPNDAT & (1<<i))
   {
    printf("K%d released\n\r", i+1);
   }
   else
   {
    printf("K%d pressed\n\r", i+1);
   }
  }
}

}

void eint4_11_irq(void)
{
int i;
printf("eint4_11_irq\n\r"); /* K5~K6 */
for (i = 4; i < 6; i ++)
{
  if (EINT0PEND & (1<<i))
  {
   if (GPNDAT & (1<<i))
   {
    printf("K%d released\n\r", i+1);
   }
   else
   {
    printf("K%d pressed\n\r", i+1);
   }
  }
}

}

void irq_init(void)
{
key_irq_init();
uart_irq_init();
}

void uart_irq(void)
{
/* 调用具体的中断处理函数 */
do_uart_irq();
/* 清中断 */
VIC1ADDRESS = 0;
}

void uart_irq_init(void)
{
VIC1INTENABLE |= (1<<5); /* bit5: int_uart0 */
VIC1VECTADDR5 = uart_irq;
}

void key_irq_init(void)
{
/* 配置GPIO引脚为中断引脚 */
/* GPN0~5 设为中断引脚 */
GPNCON &= ~(0xfff);
GPNCON |= 0xaaa;

/* 设置中断触发方式为: 双边沿触发 */
EINT0CON0 &= ~(0xfff);
EINT0CON0 |= 0x777;

/* 使能中断 */
EINT0MASK &= ~(0x3f);

/* 在中断控制器里使能这些中断 */
VIC0INTENABLE |= (0x3); /* bit0: eint0~3, bit1: eint4~11 */

VIC0VECTADDR0 = eint0_3_irq;
VIC0VECTADDR1 = eint4_11_irq;
}

void do_irq(void)
{
int i = 0;

void (*the_isr)(void);

if (VIC0IRQSTATUS)

{
  the_isr = VIC0ADDRESS;

  /* 2.1 分辨是哪个中断 */
  /* 2.2 调用它的处理函数 */
  /* 2.3 清中断 */

  the_isr();

  EINT0PEND   = 0x3f; /* 清中断 */
  VIC0ADDRESS = 0;
}
else if (VIC1IRQSTATUS)
{
  the_isr = VIC1ADDRESS;

  /* 2.1 分辨是哪个中断 */
  /* 2.2 调用它的处理函数 */
  /* 2.3 清中断 */

the_isr();
}
}

#define ULCON0     (*((volatile unsigned long *)0x7F005000))
#define UCON0      (*((volatile unsigned long *)0x7F005004))
#define UFCON0     (*((volatile unsigned long *)0x7F005008))
#define UMCON0     (*((volatile unsigned long *)0x7F00500C))
#define UTRSTAT0   (*((volatile unsigned long *)0x7F005010))
#define UFSTAT0    (*((volatile unsigned long *)0x7F005018))
#define UTXH0      (*((volatile unsigned char *)0x7F005020))
#define URXH0      (*((volatile unsigned char *)0x7F005024))
#define UBRDIV0    (*((volatile unsigned short *)0x7F005028))
#define UDIVSLOT0 (*((volatile unsigned short *)0x7F00502C))
#define UINTP0      (*((volatile unsigned long *)0x7F005030))

#define UINTM0 (*((volatile unsigned long *)0x7F005038))

#define GPACON (*((volatile unsigned short *)0x7F008000))

#define ENABLE_FIFO 1

static delay(void)
{
volatile int i = 10;
while (i--);
}

void uart_tx_int_enable(void)
{
UINTM0 &= ~(1<<2);

}

void uart_tx_int_disable(void)
{
UINTM0 |= (1<<2);
}

void init_uart(void)
{
GPACON &= ~0xff;
GPACON |= 0x22;

/* ULCON0 */
ULCON0 = 0x3; /* 数据位:8, 无较验, 停止位: 1, 8n1 */
UCON0 = 0x5 | (1<<9); /* 使能UART发送、接收, tx interrupt request type = level */
#ifdef ENABLE_FIFO
UFCON0 = 0x07 | (1<<6); /* FIFO enable, tx fifo trigger level = 16 bytes */ //中断产生条件（FIFO内数据少于多少时，产生中断）

#else
UFCON0 = 0x00; /* FIFO disable */
#endif
UMCON0 = 0;

/* 波特率 */
/* DIV_VAL = (PCLK / (bps x 16 ) ) - 1
* bps = 57600
* DIV_VAL = (66500000 / (115200 x 16 ) ) - 1
* = 35.08
*/
UBRDIV0 = 35;

/* x/16 = 0.08
* x = 1
*/
UDIVSLOT0 = 0x1;

UINTM0 = 0xF; //关闭中断

}

unsigned char getc(void)
{
#ifdef ENABLE_FIFO
while ((UFSTAT0 & (1<<6)) == 0 && (UFSTAT0 & 0x3f) == 0)delay();
#else
while ((UTRSTAT0 & (1<<0)) == 0);
#endif

return URXH0;
}

int getc_nowait(unsigned char *pChar)
{
#ifdef ENABLE_FIFO
if ((UFSTAT0 & (1<<6)) == 0 && (UFSTAT0 & 0x3f) == 0)
#else
if ((UTRSTAT0 & (1<<0)) == 0)
#endif
{
  return -1;
}
else
{
  *pChar = URXH0;
  return 0;
}
}

#define TX_BUF_LEN 2048
static unsigned char txbuf[2047];
static unsigned int r_idx = 0;
static unsigned int w_idx = 0;

static int isFull(void)
{
if ((w_idx + 1) % TX_BUF_LEN == r_idx)
return 1;
else
return 0;
}

static int isEmpty(void)
{
return (w_idx == r_idx);
}

static int putData(unsigned char data)
{
if (isFull())
  return -1;
else
{
  txbuf[w_idx] = data;
  w_idx = (w_idx + 1) % TX_BUF_LEN;
  return 0;
}
}

static int getData(unsigned char *pdata)
{
if (isEmpty())
{
  return -1;
}
else
{
  *pdata = txbuf[r_idx];
  r_idx = (r_idx + 1) % TX_BUF_LEN;
  return 0;
}
}

void putc(char c)
{
putData(c); /* 把数据放到环形缓冲区里去 */

/* 如果"uart 发送中断"未使能的话，使能"uart 发送中断" */
uart_tx_int_enable();
}

void do_uart_irq(void)
{
int i;
int cnt;
unsigned char c;

if (UINTP0 & (1<<2))
{
  /* 对于发送中断 */
   if (isEmpty())
   {
   /* 禁止中断 */
   uart_tx_int_disable();
   }
   else
   {
   /* 从环型缓冲区里取出数据, 放到TX   FIFO里去 */
   cnt = (UFSTAT0 >> 8) & 0x3f;
   cnt = 64 - cnt;                                        //计算FIFO还剩多少数据空间，继续写入
   for (i = 0; i < cnt; i++)
   {
    if (getData(&c) == 0)
    {
     UTXH0 = c;
    }
    else
    {
     break;
    }
   }
   }
}

else if (UINTP0 & (1<<0))
{
/* 对于接收中断, 从RX FIFO里取出数据 */
}

/* 清中断 */
UINTP0 = 0xf;
}

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