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Discussion - EVE / Multiple Buttons Question

« on: August 03, 2021, 06:05:48 PM »

Hello,
I am trying to set up multiple buttons on a display. I have two buttons and the first one is working fine to stop and start a counter. However the second button is able to start the counter but then becomes inoperable when I try to stop the counter. I am using the same code for both but I am new to this and can't figure out the issue. I hope this is an easy fix, I've tried searching the forum but can't find an example. This is on a 7" EVE4 display. Thank you for any help!

Todd

Code: [Select]

/* check for touch events and setup vars for TFT_display() */
void TFT_touch(void)
{
	uint8_t tag;
	uint8_t tag2;
	static uint8_t toggle_lock = 0;
	static uint8_t toggle_lock2 = 0;
	
	if(EVE_busy()) /* is EVE still processing the last display list? */
	{
		return;
	}

	display_list_size = EVE_memRead16(REG_CMD_DL); /* debug-information, get the size of the last generated display-list */
	tag = EVE_memRead8(REG_TOUCH_TAG); /* read the value for the first touch point */
    	tag2 = EVE_memRead8(REG_TOUCH_TAG); /* necessary? or can just one tag be used? */

	switch(tag)
	{
		case 0:
			toggle_lock = 0;
			break;
		
		case 10: /* use button on top as on/off radio-switch */
			if(toggle_lock == 0)
			{
				toggle_lock = 42;
				if(toggle_state == 0)
				{
					toggle_state = EVE_OPT_FLAT;
				}
				else
				{
					toggle_state = 0;
				}
			}
			break;

		
	}

	switch(tag2)
	{
		case 1:
			toggle_lock2 = 0;
			break;

		case 11: /* use button on top as on/off radio-switch */
			if(toggle_lock2 == 0)
			{
				toggle_lock2 = 42;
				if(toggle_state2 == 0)
				{
					toggle_state2 = EVE_OPT_FLAT ;
				}
				else
				{
					toggle_state2 = 0;
				}
			}
			break;
	}
}

void TFT_display(void)
{
	//static int32_t rotate = 0;
	

	if(tft_active != 0)
	{
		#if defined (EVE_DMA)
			uint16_t cmd_fifo_size;
			cmd_fifo_size = EVE_dma_buffer_index*4; /* without DMA there is no way to tell how many bytes are written to the cmd-fifo */
		#endif

		EVE_start_cmd_burst(); /* start writing to the cmd-fifo as one stream of bytes, only sending the address once */

		EVE_cmd_dl_burst(CMD_DLSTART); /* start the display list */
		EVE_cmd_dl_burst(DL_CLEAR_RGB | BLACK); /* set the default clear color to white */
		EVE_cmd_dl_burst(DL_CLEAR | CLR_COL | CLR_STN | CLR_TAG); /* clear the screen - this and the previous prevent artifacts between lists, Attributes are the color, stencil and tag buffers */
		EVE_cmd_dl_burst(TAG(0));

		EVE_cmd_append_burst(MEM_DL_STATIC, num_dl_static); /* insert static part of display-list from copy in gfx-mem */
		/* display a button */
		EVE_cmd_dl_burst(DL_COLOR_RGB | GREEN);
		EVE_cmd_fgcolor_burst(0x00c0c0c0); /* some grey */
		EVE_cmd_dl_burst(TAG(10)); /* assign tag-value '10' to the button that follows */
		EVE_cmd_button_burst(20,120,120,70, 28, toggle_state,"Touch!");
		EVE_cmd_dl_burst(TAG(0)); /* no touch */

		
		if(toggle_state != 0)
		{
			 basicnumber++;
		}

		EVE_cmd_dl_burst(DL_COLOR_RGB | RED);
		EVE_cmd_fgcolor_burst(0x00c0c0c0); /* some grey */
		EVE_cmd_dl_burst(TAG(11)); 
		EVE_cmd_button_burst(220,320,120,70, 28, toggle_state2,"Touch2!");
		EVE_cmd_dl_burst(TAG(1)); /* no touch */

		if(toggle_state2 != 0)
		{
			basicnumber2++;
		}

		EVE_cmd_dl_burst(DL_COLOR_RGB | PURPLE);
		EVE_cmd_number_burst(120, EVE_VSIZE - 35, 26, EVE_OPT_RIGHTX|5, basicnumber);
		EVE_cmd_number_burst(120, EVE_VSIZE - 20, 26, EVE_OPT_RIGHTX|6, basicnumber2);

		EVE_cmd_dl_burst(DL_DISPLAY); /* instruct the graphics processor to show the list */
		EVE_cmd_dl_burst(CMD_SWAP); /* make this list active */

		EVE_end_cmd_burst(); /* stop writing to the cmd-fifo, the cmd-FIFO will be executed automatically after this or when DMA is done */
	}
}

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