Configuration Steps to Enable and Scrolling
the Characters in this Mode
- Disable SLCD and disable all the
previous running modes as given in
xpro_lcd_clear_all()
- Configure the NSEG and DEC values in
the Character Mapping Configuration register (CMCFG) and the mask value in the
CMDMASK register, as shown in Figure 2
- Write the appropriate configuration
for the ACM scrolling mode mentioned in the above section (Automated Character Mapping and Initialization), using the function
slcd_automated_char_set_config()
- Disable the frame counter using the
function
slcd_disable_frame_counter(FCx)
- Write the configurations of the frame
counter associated with this mode in FCx.OVF and FCx.PB by using the function
slcd_set_frame_counter(FCx,0,0x1), and enable it by using the
function slcd_enable_frame_counter(FCx)
- Enable the automated character
mapping mode by writing the CTRLC. ACMEN bit using the function
slcd_enable_automated_character()
- Configure the DMA resource parameters
and allocate the resource using the function
configure_dma_resource(&example_resource)
- Configure the DMA descriptor
parameters by using the function
setup_transfer_descriptor(&example_resource)
- Create the call-back function,
register call-back, and enable the call-back if the application requires
- Call the function
dma_start_transfer_job(&example_resource). When the ACM
peripheral trigger occurs, the DMA transfer will be initiated automatically.
- Since DMA transaction has been
configured as linked descriptor, the exit from the continuous transaction, disabling
the ACM scrolling mode and free the DMA channel used for this mode are implemented
in the function
dma_callback() by using the
dma_break variable