TQ210 bare metal programming - key lighting (Part 2)

Today, we use the interrupt method to program the button lighting of the TQ210 bare machine.

#define GPC0CON *((volatile unsigned int *)0xE0200060)

#define GPC0DAT *((volatile unsigned int *)0xE0200064)

#define GPH0CON *((volatile unsigned int *)0xE0200C00)

#define GPH0DAT *((volatile unsigned int *)0xE0200C04)

#define EXT_INT_0_CON *((volatile unsigned int *)0xE0200E00)

#define EXT_INT_0_MASK *((volatile unsigned int *)0xE0200F00)

#define VIC0INTSELECT *((volatile unsigned int *)0xF200000C)

#define VIC0INTENABLE *((volatile unsigned int *)0xF2000010)

#define VIC0VECTADDR0 *((volatile unsigned int *)0xF2000100)

#define VIC0VECTADDR1 *((volatile unsigned int *)0xF2000104)

#define VIC0ADDRESS  *((volatile unsigned int *)0xF2000F00)

#define EXT_INT_0_PEND *((volatile unsigned int *)0xE0200F40)

extern void key_isr(void);

void key_handle()

{

volatile unsigned char key_code = EXT_INT_0_PEND & 0x3;

VIC0ADDRESS = 0; /* Clear interrupt vector register */

EXT_INT_0_PEND |= 3; /* Clear interrupt pending register*/

if (key_code == 1) /* key1 */

GPC0DAT ^= 1 << 3; /* toggle LED1 */

else if (key_code == 2) /* key2 */

GPC0DAT ^= 1 << 4; /* toggle LED2 */

}

int main()

{

GPC0CON &= ~(0xFF << 12);

GPC0CON |= 0x11 << 12; /* Configure GPC0_3 and GPC0_4 as output: LED1 and LED2 */

GPH0CON |= 0xFF << 0; /* Configure GPH0_0 and GPH0_1 as external interrupts: key1 and key2 */

EXT_INT_0_CON &= ~(0xFF << 0);

EXT_INT_0_CON |= 2 | (2 << 4); /* Configure EXT_INT[0] and EXT_INT[1] as falling edge trigger*/

EXT_INT_0_MASK &= ~3; /* Unmask external interrupts EXT_INT[0] and EXT_INT[1] */

VIC0INTSELECT &= ~3; /* Select external interrupt EXT_INT[0] and external interrupt EXT_INT[1] as IRQ type interrupt*/

VIC0INTENABLE |= 3; /* Enable external interrupts EXT_INT[0] and EXT_INT[1] */

VIC0VECTADDR0 = (int)key_isr; /* When EXT_INT[0] triggers an interrupt, that is, when the user presses key1,

The CPU will automatically assign the value of VIC0VECTADDR0 to VIC0ADDRESS and jump to this address to execute */

VIC0VECTADDR1 = (int)key_isr;

while (1);

return 0;

}