Qsys. The data transferred through Lightweight HPS-to-FPGA Bridge is converted into Avalon-MM
master interface. Both PIO Controller and HEX Controller work as Avalon-MM slave in the system.
They control the associated pins to change the state of LED and HEX. This is similar to a system
using Nios II processor to control LED and HEX.
Figure 7-1 FPGA LED and HEX are controlled by HPS
LED and HEX control
The Lightweight HPS-to-FPGA Bridge is a peripheral of HPS. The software running on Linux
cannot access the physical address of the HPS peripheral. The physical address must be mapped to
the user space before the peripheral can be accessed. Alternatively, a customized device driver
module can be added to the kernel. The entire CSR span of HPS is mapped to access various
registers within that span. The mapping function and the macro defined below can be reused if any
other peripherals whose physical address is also in this span.
The start address of Lightweight HPS-to-FPGA Bridge after mapping can be retrieved by
ALT_LWFPGASLVS_OFST, which is defined in altera_hps hardware library. The slave IP
connected to the bridge can then be accessed through the base address and the register offset in
these IPs. For instance, the base address of the PIO slave IP in this system is 0x0001_0040, the
direction control register offset is 0x01, and the data register offset is 0x00. The following statement
is used to retrieve the base address of PIO slave IP.
h2p_lw_led_addr=virtual_base+( ( unsigned long )( ALT_LWFPGASLVS_OFST
+ LED_PIO_BASE ) & ( unsigned long)( HW_REGS_MASK ) );
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