{"id":14853,"date":"2023-06-19T09:15:55","date_gmt":"2023-06-19T03:45:55","guid":{"rendered":"https:\/\/fastbitlab.com\/?p=14853"},"modified":"2023-08-17T16:01:51","modified_gmt":"2023-08-17T10:31:51","slug":"stm32-ltdc-lcd-tft-lvglmcu3-lecture-36-ltdc-background-testing","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/stm32-ltdc-lcd-tft-lvglmcu3-lecture-36-ltdc-background-testing\/","title":{"rendered":"STM32-LTDC, LCD-TFT, LVGL(MCU3) Lecture 36| LTDC background testing"},"content":{"rendered":"
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LTDC background testing<\/b><\/span><\/h1>\n
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Configuration horizontal synchronization and vertical synchronization timings code.<\/span><\/p>\n

void<\/span> LTDC_Init(void<\/span>)\r\n{\r\nLTDC_TypeDef<\/span> *pLTDC = LTDC;\r\n\r\nREG_SET_BIT(RCC->APB2ENR<\/span>,RCC_APB2ENR_LTDCEN_Pos);\r\n\r\n\/\/Configure horizontal synchronization timings<\/span>\r\nREG_SET_VAL(pLTDC->SSCR<\/span>,(BSP_LCD_HSW-1),0xFFFU,LTDC_SSCR_HSW_Pos);\r\nREG_SET_VAL(pLTDC->BPCR<\/span>,(BSP_LCD_HSW+BSP_LCD_HBP-1),0xFFFU,LTDC_BPCR_AHBP_Pos);\r\nREG_SET_VAL(pLTDC->AWCR<\/span>,(BSP_LCD_HSW+BSP_LCD_HBP+BSP_LCD_ACTIVE_WIDTH_LANDSCAPE -1),0xFFFU,LTDC_AWCR_AAW_Pos);\r\nuint32_t<\/span> total_width = BSP_LCD_HSW+BSP_LCD_HBP+BSP_LCD_ACTIVE_WIDTH_LANDSCAPE+BSP_LCD_HFP-1;\r\nREG_SET_VAL(pLTDC->TWCR<\/span>,total_width,0xFFFU,LTDC_TWCR_TOTALW_Pos);\r\n\r\n\/\/configure the vertical synchronization timings<\/span>\r\nREG_SET_VAL(pLTDC->SSCR<\/span>,(BSP_LCD_VSW-1),0x7FFU,LTDC_SSCR_VSH_Pos);\r\nREG_SET_VAL(pLTDC->BPCR<\/span>,(BSP_LCD_VSW+BSP_LCD_VBP-1),0x7FFU,LTDC_BPCR_AVBP_Pos);\r\nREG_SET_VAL(pLTDC->AWCR<\/span>,(BSP_LCD_VSW+BSP_LCD_VBP+BSP_LCD_ACTIVE_HEIGHT_LANDSCAPE-1),0x7FFU,LTDC_AWCR_AAH_Pos);\r\nuint32_t<\/span> total_height = BSP_LCD_VSW+BSP_LCD_VBP+BSP_LCD_ACTIVE_HEIGHT_LANDSCAPE+BSP_LCD_VFP-1;\r\nREG_SET_VAL(pLTDC->TWCR<\/span>,total_height,0x7FFU,LTDC_TWCR_TOTALH_Pos);<\/pre>\n
Configure the background color RED<\/b><\/span><\/p>\n
REG_SET_VAL(pLTDC->BCCR, 0xFF0000U, 0xFFFFFFU, LTDC_BCCR_BCBLUE_Pos);<\/b><\/span><\/p>\n
The code sets the LTDC’s Background Color Control Register (BCCR) to display the color red. The BCCR is a register that determines the background color of the display when no image is present.<\/span><\/p>\n
The <\/span>REG_SET_VAL<\/span> function appears to be a macro or a function that sets a specific bit range within a register to a given value.<\/span><\/span><\/p>\n
In this case, the <\/span>REG_SET_VAL<\/span> function sets the bits corresponding to the red color component (0xFF0000U) to 1 and sets the bits corresponding to the blue and green color components (0xFFFFFFU) to 0. This effectively sets the background color to solid red.<\/span><\/span><\/p>\n
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Enable the LTDC peripheral<\/b><\/span><\/p>\n
After that, you enable the LTDC peripheral:<\/span>–<\/span> REG_SET_BIT(pLTDC->GCR, <\/span><\/strong><\/span>LTDC_GCR_LTDCEN_Pos); <\/b><\/span><\/p>\n
Once you execute this step, you must see the Red color on the display.<\/span><\/p>\n
Test the code on the hardware. As you can see, the display shows a Red color, but it doesn’t occupy the whole screen, leaving some gaps (Figure 1).<\/span><\/p>\n
\"Figure
Figure 1. Output<\/figcaption><\/figure>\n
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Let me explain the reason for that. Here, we will change <\/span>BSP_LCD_ACTIVE_HEIGHT_LANDSCAPE<\/b> to <\/span>BSP_LCD_ACTIVE_WIDTH_LANDSCAPE<\/b>. This change needs to be made in both horizontal and vertical synchronization timings. <\/span><\/span><\/p>\n
\/\/Configure horizontal synchronization timings<\/span>\r\nREG_SET_VAL(pLTDC->SSCR<\/span>,(BSP_LCD_HSW-1),0xFFFU,LTDC_SSCR_HSW_Pos);\r\nREG_SET_VAL(pLTDC->BPCR<\/span>,(BSP_LCD_HSW+BSP_LCD_HBP-1),0xFFFU,LTDC_BPCR_AHBP_Pos);\r\nREG_SET_VAL(pLTDC->AWCR<\/span>,(BSP_LCD_HSW+BSP_LCD_HBP+BSP_LCD_ACTIVE_WIDTH_LANDSCAPE -1),0xFFFU,LTDC_AWCR_AAW_Pos);\r\nuint32_t<\/span> total_width = BSP_LCD_HSW+BSP_LCD_HBP+BSP_LCD_ACTIVE_WIDTH_LANDSCAPE+BSP_LCD_HFP-1;\r\nREG_SET_VAL(pLTDC->TWCR<\/span>,total_width,0xFFFU,LTDC_TWCR_TOTALW_Pos);\r\n\r\n\/\/configure the vertical synchronization timings<\/span>\r\nREG_SET_VAL(pLTDC->SSCR<\/span>,(BSP_LCD_VSW-1),0x7FFU,LTDC_SSCR_VSH_Pos);\r\nREG_SET_VAL(pLTDC->BPCR<\/span>,(BSP_LCD_VSW+BSP_LCD_VBP-1),0x7FFU,LTDC_BPCR_AVBP_Pos);\r\nREG_SET_VAL(pLTDC->AWCR<\/span>,(BSP_LCD_VSW+BSP_LCD_VBP+BSP_LCD_ACTIVE_WIDTH_LANDSCAPE-1),0x7FFU,LTDC_AWCR_AAH_Pos);\r\nuint32_t<\/span> total_height = BSP_LCD_VSW+BSP_LCD_VBP+BSP_LCD_ACTIVE_WIDTH_LANDSCAPE+BSP_LCD_VFP-1;\r\nREG_SET_VAL(pLTDC->TWCR<\/span>,total_height,0x7FFU,LTDC_TWCR_TOTALH_Pos);<\/pre>\n
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Once you make these changes, test the program.  Then you can get the proper output(Figure 2).<\/span><\/p>\n
\"LTDC
Figure 2. Output<\/figcaption><\/figure>\n
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You can also try changing some values to see different colors. For instance, you can change the red value (0XFF0000U) to produce the Blue color (0x0000FFU).<\/span><\/p>\n
\/\/Configure the background color(BLUE)<\/span>\r\nREG_SET_VAL(pLTDC->BCCR<\/span>,0x0000FFU,0xFFFFFFU,LTDC_BCCR_BCBLUE_Pos);<\/pre>\n
As shown in Figure 3, the output now produces the Blue color.<\/span><\/p>\n
\"LTDC
Figure 3. Produced blue color<\/figcaption><\/figure>\n
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FastBit Embedded Brain Academy Courses<\/b><\/span><\/p>\n
Click here: https:\/\/fastbitlab.com\/course1<\/a><\/span><\/p>\n
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  LTDC background testing   Configuration horizontal synchronization and vertical synchronization timings code. void LTDC_Init(void) { LTDC_TypeDef *pLTDC = LTDC; REG_SET_BIT(RCC->APB2ENR,RCC_APB2ENR_LTDCEN_Pos); \/\/Configure horizontal synchronization timings REG_SET_VAL(pLTDC->SSCR,(BSP_LCD_HSW-1),0xFFFU,LTDC_SSCR_HSW_Pos); REG_SET_VAL(pLTDC->BPCR,(BSP_LCD_HSW+BSP_LCD_HBP-1),0xFFFU,LTDC_BPCR_AHBP_Pos); REG_SET_VAL(pLTDC->AWCR,(BSP_LCD_HSW+BSP_LCD_HBP+BSP_LCD_ACTIVE_WIDTH_LANDSCAPE -1),0xFFFU,LTDC_AWCR_AAW_Pos); uint32_t total_width = BSP_LCD_HSW+BSP_LCD_HBP+BSP_LCD_ACTIVE_WIDTH_LANDSCAPE+BSP_LCD_HFP-1; REG_SET_VAL(pLTDC->TWCR,total_width,0xFFFU,LTDC_TWCR_TOTALW_Pos); \/\/configure the vertical synchronization timings REG_SET_VAL(pLTDC->SSCR,(BSP_LCD_VSW-1),0x7FFU,LTDC_SSCR_VSH_Pos); REG_SET_VAL(pLTDC->BPCR,(BSP_LCD_VSW+BSP_LCD_VBP-1),0x7FFU,LTDC_BPCR_AVBP_Pos); REG_SET_VAL(pLTDC->AWCR,(BSP_LCD_VSW+BSP_LCD_VBP+BSP_LCD_ACTIVE_HEIGHT_LANDSCAPE-1),0x7FFU,LTDC_AWCR_AAH_Pos); uint32_t total_height = BSP_LCD_VSW+BSP_LCD_VBP+BSP_LCD_ACTIVE_HEIGHT_LANDSCAPE+BSP_LCD_VFP-1; REG_SET_VAL(pLTDC->TWCR,total_height,0x7FFU,LTDC_TWCR_TOTALH_Pos); Configure the background color RED REG_SET_VAL(pLTDC->BCCR, 0xFF0000U, 0xFFFFFFU, […]<\/p>\n","protected":false},"author":1,"featured_media":14857,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"off","ocean_gallery_id":[],"footnotes":""},"categories":[8],"tags":[],"class_list":["post-14853","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","entry","has-media"],"yoast_head":"\nOptimizing 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