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XChoo
Beginner
245 Views

How to access FPGA peripherals from ARM

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I would like to know how to access FPGA from ARM?

IS there any example ?

 

Thank you

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1 Solution
Fawaz_J_Intel
Employee
79 Views

Hello,

You can access the FPGA peripherals through the bridges based on your connection in Platform Designer.

lets say you have a peripheral connected to h2f bridge. You can use ARM to access this IP through the h2f bridge offset + the IP offset in qsys.

 

Lets say you have a qsys IP, defined in a c code:

#define SYSID_BASE 0x10000

 

The h2f bridge can be accessed through this address:

#define ALT_AXI_FPGASLVS_OFST 0xC0000000

 

 

Then, you need to open your mem device in your linux system:

 

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

printf( "ERROR: could not open \"/dev/mem\"...\n" );

return( 1 );

}

 

Next, create the virtual memory:

virtual_base = mmap( NULL, HW_REGS_SPAN, ( PROT_READ | PROT_WRITE ), MAP_SHARED, fd, ALT_AXI_FPGASLVS_OFST );

 

 

After that, you can cast the pointer of system_ID to your virtual memory:

qsys_id_addr =virtual_base + ( ( unsigned long )( ALT_LWFPGASLVS_OFST + SYSID_BASE ) & ( unsigned long)( HW_REGS_MASK ) );

 

Finally, you should be able to use qsys_id_addr pointer to access your system ID IP in qsys:

printf("system ID = %x",*(uint32_t *)qsys_id_addr);

 

Hope this might help.

 

Thank you

 

 

 

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2 Replies
Fawaz_J_Intel
Employee
80 Views

Hello,

You can access the FPGA peripherals through the bridges based on your connection in Platform Designer.

lets say you have a peripheral connected to h2f bridge. You can use ARM to access this IP through the h2f bridge offset + the IP offset in qsys.

 

Lets say you have a qsys IP, defined in a c code:

#define SYSID_BASE 0x10000

 

The h2f bridge can be accessed through this address:

#define ALT_AXI_FPGASLVS_OFST 0xC0000000

 

 

Then, you need to open your mem device in your linux system:

 

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

printf( "ERROR: could not open \"/dev/mem\"...\n" );

return( 1 );

}

 

Next, create the virtual memory:

virtual_base = mmap( NULL, HW_REGS_SPAN, ( PROT_READ | PROT_WRITE ), MAP_SHARED, fd, ALT_AXI_FPGASLVS_OFST );

 

 

After that, you can cast the pointer of system_ID to your virtual memory:

qsys_id_addr =virtual_base + ( ( unsigned long )( ALT_LWFPGASLVS_OFST + SYSID_BASE ) & ( unsigned long)( HW_REGS_MASK ) );

 

Finally, you should be able to use qsys_id_addr pointer to access your system ID IP in qsys:

printf("system ID = %x",*(uint32_t *)qsys_id_addr);

 

Hope this might help.

 

Thank you

 

 

 

View solution in original post

XChoo
Beginner
79 Views

Thank you very much Fjumaah. With your help, I can run my first application,

 

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