This page will contain the information about the combined lcd/button matrix forum topicuCApps
right now I'm using a modified version of the sm_simple C example
this code will be rewritten to make it more coherent
modifications to scan matrix example uCApps
Hardware
*note: schematics not finished!
Software
in main.c:
... //second shiftregister drives the leds #define LEDOUT 1 ... void LM_SetRow(){ MIOS_DOUT_SRSet(LEDOUT,ledtest[sm_col]); } ///////////////////////////////////////////////////////////////////////////// // This function is called by MIOS before the shift register are loaded ///////////////////////////////////////////////////////////////////////////// void SR_Service_Prepare(void) __wparam { // call the Scan Matrix Driver SM_PrepareCol(); // call the Led Matrix Driver LM_SetRow(); } ...
in sm_simple.asm:
...
global _sm_button_column
global _sm_button_row
global _sm_button_value
global _sm_col
;; import lables
extern _SM_NotifyToggle
; ==========================================================================
accessram udata ; (no access ram required, these variables can be located anywhere)
_sm_button_column res 1 ; exported to C, therefore an "_" has been added
_sm_button_row res 1
_sm_button_value res 1
_sm_col res 1
...
SM_PrepareCol
;; select next DOUT register
;; (current column + 1) & 0x07
SET_BSR sm_selected_column
incf sm_selected_column, W, BANKED ; (* see note below)
andlw 0x07
;_sm_col is used by LM_SetRow()
movwf _sm_col
call MIOS_HLP_GetBitANDMask ; (inverted 1 of 8 code)
...
and finally in sm_simple.h:
... extern unsigned char sm_button_value; extern unsigned char sm_col; ...
Appendum
To avoid flickering leds when pushing a button the MIOS button debouncing should be turned off!!
Due to the setup of the SRIO driver the debounce algoritm also delays the DOUT chain when a DIN event is being debounced. So when a button is pushed the led update frequency is reduced, the higher the debounce value, the lower the update frequency.
According to this post TK will fix this in a future MIOS release:
This is something what I'm planning to solve in one of the next MIOS versions - currently the same SR scanning routine is used for DIN and DOUT registers, which means, >when the DINs are temporary disabled due to the cheap debouncing method, the DOUT registers won't be updated.
The solution is to add a second scan routine which only services the DOUTs so long the debouncing delay is active.
In the meantime THIS ISSUE IS SOLVED WITH MIOS1.9c!!!