Cyclone V LCD / I2C (baremetal) sample for Altera's SoC DevKit

Hi,

I want to give you some hints to get it running.

it's not very difficult to get it running on a baremetal system. You can still use the hwlib.

There is a headerfile called alt_i2c.h. This file contains a lot of definitions, needed to implement an i2c driver for your application.

To write something to the LCD you have to do the following steps:

first step: you need to write an init-function for the i2c interface. here you have to do the following steps:

1. Disable the i2c controller by clearing the enabled bit in the alt_i2c_en register

2. set the controller to master mode (register alt_i2c_con_mst_mod)

3. set the speed to standard (the newheaven display only supports 100khz clock rate) (register alt_i2c_con_speed)

4. enable the i2c controller (set enabled bit in the alt_i2c_en register)

second step: address the slave

1. write the address of the slave to the alt_i2c_tar register

third step: the write function:

1. to send data you have to set the ALT_i2c_data_cmd_cmd Register to WRITE

2. write the data to the alt_i2c_data_cmd_dat Register

Now data will be send on the I2C. If you want to implement a full driver you can also check the status register etc. when you send some data...

Some hints for the newheaven LCD:

• Slave address is 0x28 (and not 0x50)

• between the commands you send, you need a delay (normally 100µs).

• A full list of special commands for the display you can find in the newheaven specification. (Download it from the newheaven website. The LCD is the NHD-0216K3Z)

I hope it helps you a bit.

Regards!