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Altera_Forum
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10 years ago

PIO Bitwise operation

Hallo, What is the best way to perform bit wise operation to clear or set specific bits on Nios II PIO port? An example CTRL_PORT = CTRL_PORT | (1 << CTRL_CS) | (1 << CTRL_RDE) | (1 <...
Altera_Forum's avatar
Altera_Forum
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10 years ago

When you instantiate a PIO in Qsys, you can optionally enable the single bit clear/set feature.

You can then use the IOWR_ALTERA_AVALON_PIO_SET_BITS / IOWR_ALTERA_AVALON_PIO_CLEAR_BITS macros.

Enabling this option you spare the instructions required to read the actual pio status and masking the existing bits.