Altera DE1-SoC - Page 93

DE1-SoC User Manual
92
www.terasic.com
March 14, 2014
Figure 6-5 gpio_swporta_ddr register in the GPIO1 controller
The following mask is defined in the demo code to control LED and KEY direction and LED’s
output value.
#define USER_IO_DIR (0x01000000)
#define BIT_LED (0x01000000)
#define BUTTON_MASK (0x02000000)
The following statement is used to configure the LED associated pins as output pins.
alt_setbits_word( ( virtual_base +
( ( uint32_t )( ALT_GPIO1_SWPORTA_DDR_ADDR ) &
( uint32_t )( HW_REGS_MASK ) ) ), USER_IO_DIR );
The following statement is used to turn on the LED.
alt_setbits_word( ( virtual_base +
( ( uint32_t )( ALT_GPIO1_SWPORTA_DR_ADDR ) &
( uint32_t )( HW_REGS_MASK ) ) ), BIT_LED );
The following statement is used to read the content of gpio_ext_porta register. The bit mask is used
to check the status of the key.
alt_read_word( ( virtual_base +
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