Set SPI speed to 1MHZ and limit I2C display

Set SPI speed to 1MHZ
Refresh I2C display only after received I2C test command to avoid I2C
collision
Set SPI Speed to 1MHZ, avoid I2C collisions

Set SPI Speed to 1MHZ
Display enabled only when received 1st I2C command to avoid I2C
collisions