DE0-Nano-SoC: How HPS(ARM) recognizes f2h_irq0 or f2h_irq1 interrupts from FPGA

Honored Contributor

10 years ago

Sebar, this is a most correct and easier way to map peripherials.

Note the differences with the project i sent you

//LWAXI# define LWAXI_FPGASLAVES_OFST ( 0xFF200000 ) //BASE ADDRES HPS2FPGA LIGHTWEIGHT_AXI# define LWAXI_SPAN ( 0x00200000 ) //IS 2MB WIDE

volatile unsigned long *DIPSWITCH_address=NULL;

//AXI

//#define AXI_FPGASLAVES_OFST ( 0xC0000000 ) //BASE ADDRES HPS2FPGA AXI INTERFACE

//#define AXI_SPAN ( 0x3C000000 ) //IS 960MB WIDE

int main(int argc, char **argv) {

void *LWAXI_virtual_base;

//void *AXI_virtual_base;

int fd;

// Open the kernel driver to memory

if( ( fd = open( "/dev/mem", ( O_RDWR | O_SYNC ) ) ) == -1 ) {

perror( "dev/mem" );

return( 1 );

}

//Map the physical address of the LIGHTHPS2FPGA AXI INTERFACE from start to end

LWAXI_virtual_base = mmap( NULL, LWAXI_SPAN, ( PROT_READ | PROT_WRITE ), MAP_SHARED, fd, LWAXI_FPGASLAVES_OFST );

//MAP ERROR

if( LWAXI_virtual_base == MAP_FAILED ) {

perror( "mmap" );

close( fd );

return( 1 );

}

//Map the DIPSWITHCHES PIO

DIPSWITCH_address = LWAXI_virtual_base + ( ( unsigned long ) ( DIPSWITCH_BASE) );

alt_read_word(DIPSWITCH_address);

// UNMAP LIGHTWEIGHT HPS2FPGA AXI

if( munmap( LWAXI_virtual_base, LWAXI_SPAN ) != 0 ) {

perror( "munmap" );

close( fd );

return( 1 );

}

close( fd );

return( 0 );

}

but the best way to do this is in a final application is to make a driver

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