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# Copyright 2014, Sinclair R.F., Inc.

#

# Run a TI TCA9554 8-bit I/O exander.  Read the 8-bit port when the interrupt is

# received and report the 8-bit setting over a 9600 baud UART as a hex value.

ARCHITECTURE core/9x8 Verilog

INSTRUCTION     2048

DATA_STACK      32

RETURN_STACK    32

PORTCOMMENT     TCA9554 interrupt and I2C bus

INPORT          1-bit           i_int                   \

                                I_INT

PERIPHERAL      open_drain      inport=I_SCL            \

                                outport=O_SCL           \

                                iosignal=io_scl

PERIPHERAL      open_drain      inport=I_SDA            \

                                outport=O_SDA           \

                                iosignal=io_sda

PORTCOMMENT     UART port

PERIPHERAL      UART_Tx         outsignal=o_uart_tx     \

                                outport=O_UART_TX       \

                                outstatus=I_UART_TX_BUSY \

                                baudmethod=25_000_000/9600

ASSEMBLY i2c_tca9554.s