Write bytes into memory.
CmdMemWrite ptr, num,
The memory address to be written
Number of bytes to be written
The data byte should immediately follow in the command buffer. If the number of bytes is not a multiple of 4, then
1, 2 or 3 bytes should be appended to ensure 4-byte alignment of the next command, these padding bytes can have any value.
The completion of this function can be detected when the value of REG_CMD_READ is equal to REG_CMD_WRITE.
Caution: if using this command, it may corrupt the memory of the FT800 if used improperly.
' To change the backlight brightness to 64 (half intensity) for a particular screen shot
CmdSwap ' finish the display list
CmdDlStart ' wait until after the swap
CmdMemWrite REG_PWM_DUTY, 4 ' write to the PWM_DUTY register