| 这是我整理的IO操作资料！
希望对大家有所帮助！
LCD显示 有关的宏定义
#define ESC_TOP_LEFT "[1;0H"//定位光标位置为1行1列
#define ESC_BOTTOM_LEFT "[2;0H"//定位光标位置为2行1列
#define ESC_CLEARE 'K' //清屏
static unsigned char esc = 0x1b;
FILE *lcd;
lcd = fopen("/dev/lcd_display", "w");
fprintf(lcd, string);
键盘 :
全局变量 volatile int edge_capture; //捕获一个
中断
static void handle_button_interrupts(void* context, alt_u32 id)
{
/* Cast context to edge_capture's type.
* It is important to keep this volatile,
* to avoid compiler optimization issues.
*/
volatile int* edge_capture_ptr = (volatile int*) context;
/* Store the value in the Button's edge capture register in *context. */
*edge_capture_ptr = IORD_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE);
/* Reset the Button's edge capture register. */
IOWR_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE, 0);
}
初始化
static void init_button_pio()
{
/* Recast the edge_capture pointer to match the alt_irq_register() function
* prototype. */
void* edge_capture_ptr = (void*) &edge_capture;
/* Enable all 4 button interrupts. */
IOWR_ALTERA_AVALON_PIO_IRQ_MASK(BUTTON_PIO_BASE, 0xf);
/* Reset the edge capture register. */
IOWR_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE, 0x0);
/* Register the interrupt handler. */
alt_irq_register( BUTTON_PIO_IRQ, edge_capture_ptr,handle_button_interrupts);
}
测试
static void TestButtons( void )
{
alt_u8 buttons_tested;
alt_u8 all_tested;
/* Variable which holds the last value of edge_capture to avoid
* "double counting" button/switch presses
*/
int last_tested;
/* Initialize the Buttons/Switches (SW0-SW3) */
init_button_pio();
/* Initialize the variables which keep track of which buttons have been
* tested. */
buttons_tested = 0x0;
all_tested = 0xf;
/* Initialize edge_capture to avoid any "false" triggers from
* a previous run.
*/
edge_capture = 0;
/* Set last_tested to a value that edge_capture can never equal
* to avoid accidental equalities in the while() loop below.
*/
last_tested = 0xffff;
/* Print a quick message stating what is happening */
printf("\nA loop will be run until all buttons/switches have been pressed.\n\n");
printf("\n\tNOTE: Once a button press has been detected, for a particular
button,\n\tanyfurther presses will be ignored!\n\n");
/* Loop until all buttons have been pressed.
* This happens when buttons_tested == all_tested.
*/
/* last_tested = 0xffff;
* edge_capture = 0;
* buttons_tested = 0x0;
* all_tested = 0xf;*/
while ( buttons_tested != all_tested )
{
if (last_tested == edge_capture)
{
continue;
}
else
{
last_tested = edge_capture;
switch (edge_capture)
{
case 0x1:
printf("\nButton 1 (SW0) Pressed.\n");
buttons_tested = buttons_tested | 0x1;
break;
case 0x2:
printf("\nButton 2 (SW1) Pressed.\n");
buttons_tested = buttons_tested | 0x2;
break;
case 0x4:
printf("\nButton 3 (SW2) Pressed.\n");
buttons_tested = buttons_tested | 0x4;
break;
case 0x8:
printf("\nButton 4 (SW3) Pressed.\n");
buttons_tested = buttons_tested | 0x8;
break;
}
}
}
/* Disable button interrupts for anything outside this loop. */
IOWR_ALTERA_AVALON_PIO_IRQ_MASK(BUTTON_PIO_BASE, 0x0);
printf ("\nAll Buttons (SW0-SW3) were pressed, at least, once.\n");
usleep(2000000);
return;
}
七段码
相关的宏定义
static void sevenseg_set_hex(alt_u8 hex)
{
static alt_u8 segments[16] =
{
0x81, 0xCF, 0x92, 0x86, 0xCC, 0xA4, 0xA0, 0x8F, 0x80, 0x84, /* 0-9 */
0x88, 0xE0, 0xF2, 0xC2, 0xB0, 0xB8 };
/* a-f */
alt_u32 data = segments[hex & 15] | (segments[(hex >> 4) & 15] << 8);*/
IOWR_ALTERA_AVALON_PIO_DATA(SEVEN_SEG_PIO_BASE,data);
}
static void SevenSegCount( void )
{
alt_u32 count;
for (count = 0; count <= 0xff; count++)
{
sevenseg_set_hex( count );
usleep(50000);
}
}
串口：
FILE *uart;
uart=fopen("/dev/uart1","w+"); // 初始化
if(uart==NULL)
{
printf("Unable to open uart\n");
exit(0);
}
char *str;
fprintf(uart,str); //向串口写
fscanf(uart,"%s",str); //向串口读 |
