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I use DE10-LITE board.
I try to use I2C for connect with external ROM.
In QSYS, I set up NIOS and I2C Master Core.
it is my code
GPIO(0) <= '0' WHEN SDA_OE = '1' ELSE 'Z';
GPIO(1) <= '0' WHEN SCL_OE = '1' ELSE 'Z';
SDA <= GPIO(0);
SCL <= GPIO(1);
u0 : component QSYS
port map (
clk_clk => MAX10_CLK1_50, -- clk.clk
reset_reset_n => RST, -- reset.reset_n
i2c_0_i2c_serial_sda_in => SDA, -- i2c_0_i2c_serial.sda_in
i2c_0_i2c_serial_scl_in => SCL, -- .scl_in
i2c_0_i2c_serial_sda_oe => SDA_OE, -- .sda_oe
i2c_0_i2c_serial_scl_oe => SCL_OE -- .scl_oe
);
and i write program code in Eclips like this.
i2c_dev = alt_avalon_i2c_open("/dev/i2c_0");
if (NULL==i2c_dev)
{
printf("Error: Cannot find /dev/i2c_0\n");
//return 1;
}
while(1)
{
alt_avalon_i2c_master_target_set(i2c_dev,SLAVE_ROM_ADDR);
status=alt_avalon_i2c_enable(i2c_dev);
i2c_tx_buf[0] = 0x00;
i2c_tx_buf[1] = 0x00;
i2c_tx_buf[2] = 0x03;
i2c_tx_buf[3] = 0x04;
status=alt_avalon_i2c_master_tx(i2c_dev, i2c_tx_buf, 4, 0);
}
and i connect gpio pins to oscilloscope. but it doesn't send any signals.
what is problem?
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I recommend to check out this example of Master-Slave https://www.macnica.co.jp/business/semiconductor/articles/intel/129485/
is in Japanese but you can get the example files and then translate the bits that you do not understand, the example worked for me.
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I recommend to check out this example of Master-Slave https://www.macnica.co.jp/business/semiconductor/articles/intel/129485/
is in Japanese but you can get the example files and then translate the bits that you do not understand, the example worked for me.

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