{"id":14747,"date":"2023-05-25T11:59:57","date_gmt":"2023-05-25T06:29:57","guid":{"rendered":"https:\/\/fastbitlab.com\/?p=14747"},"modified":"2023-08-17T14:59:31","modified_gmt":"2023-08-17T09:29:31","slug":"stm32-ltdc-lcd-tft-lvglmcu3-lecture-31-testing-tft-lcd-command-sending","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/stm32-ltdc-lcd-tft-lvglmcu3-lecture-31-testing-tft-lcd-command-sending\/","title":{"rendered":"STM32-LTDC, LCD-TFT, LVGL(MCU3) Lecture 31| Testing TFT-LCD command sending"},"content":{"rendered":"
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 <\/p>\n

Testing TFT-LCD command sending<\/b><\/span><\/h1>\n
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 <\/p>\n<\/div>\n<\/div>\n<\/div>\n

In this article, we initialize the SPI peripheral first and then call the function LCD_SPI_Enable() to activate it.<\/span><\/p>\n

\"Figure
Figure 1. LCD_SPI_Enable<\/span><\/figcaption><\/figure>\n

The code is shown in Figure 1. It just sets the SPE bit of the control register 1. After that, you reset the board and you send commands to the LCD and these are the commands. <\/span><\/p>\n

In the <\/span>LCD_SPI_Init<\/span> function, we are currently in the controller mode and BIDI mode. However, we have not yet configured whether we want to transmit or receive on the bidirectional data line, which needs to be done separately.<\/span><\/span><\/p>\n

To achieve this, we can use the <\/span>BIDIOE<\/span> bit, which is the output enable in bidirectional mode. This bit must be set to 1 whenever we want to transmit data. As we intend to transmit data, we should set this bit to 1.<\/span><\/span><\/p>\n

\"Figure
Figure 2.BIDIOE<\/span><\/figcaption><\/figure>\n

 <\/p>\n

Please make the changes shown in Figure 3 by utilizing the ‘<\/span>REG_SET_BIT(pSPI->CR1, SPI_CR1_BIDIOE_Pos)<\/b><\/span>‘ function.<\/span><\/span><\/p>\n

\"Figure
Figure 3. Code<\/span><\/figcaption><\/figure>\n

 <\/p>\n

You need to connect the logic analyzers to all of the pins to trace the signals. Once this is done, load the code onto the board and activate the IDE’s debug mode. I’ll open the logic analyzer software now.<\/span><\/p>\n

Here I set the sample rate to 24. I’ll select 24, and then let’s click start. <\/span><\/p>\n

\"Figure
Figure 4. Logic analyzer<\/span><\/figcaption><\/figure>\n

 <\/p>\n

Look at the trace in Figure 5. <\/span><\/p>\n

\"Figure
Figure 5. Trace<\/span><\/figcaption><\/figure>\n

 <\/p>\n

As you can see(Figure 5), this trace appears incorrect. Although we are correctly setting DCX low after making CS low, the clock signal is being generated outside the expected timing. Ideally, data transactions should occur only after the CS line has been asserted to low, but it appears to be happening outside of that boundary in this case. This indicates that there may be an issue with our code.<\/span><\/p>\n

There is actually a mistake that I made here, which is mentioned in the reference manual. You can check the SR for the Busy flag.<\/span><\/p>\n

\"Figure
Figure 6. Busy flag<\/span><\/figcaption><\/figure>\n

Busy flag must be used with caution: <\/span> refer to section 28.3.7 for more information. <\/span><\/span><\/p>\n

 <\/p>\n

\"Testing
Figure 7. BIDIMODE<\/span><\/figcaption><\/figure>\n

Here you can see that, when BIDIMODE = 1, and BIDIOE=1, wait until TXE =1, so this we are not doing.<\/span><\/p>\n

After the last data is written into the SPI_DR register: <\/span><\/p>\n

    \n
  1. wait until TXE = 1, <\/span><\/li>\n
  2. then wait until BSY = 0, <\/span><\/li>\n
  3. Disable the SPI (SPE=0) and, eventually, enter the Halt mode. (You can conclude that it is the end of the transfer)<\/span><\/li>\n<\/ol>\n

     <\/p>\n

    Let’s go back to our bsp_lcd.c code, and here we will add the following line.<\/span><\/p>\n

    while(!REG_READ_BIT(pSPI->SR, SPI_SR_TXE_Pos));<\/b><\/span> (line 199 and 213, as shown in Figure 8).<\/span><\/span><\/p>\n

    \"Testing
    Figure 8. Code<\/span><\/figcaption><\/figure>\n

     <\/p>\n

    Let’s take a look at the trace. I’ll reset the board first.  <\/span><\/p>\n

    Look at Figure 9, now it is happening correctly. So, the transaction is happening inside this CS assertion.<\/span><\/p>\n

    \"Testing
    Figure 9. Trace<\/span><\/figcaption><\/figure>\n

     <\/p>\n

    To decode the data line, navigate to the Analyzers section and select SPI. MOSI is referred to as SDA, so select number 4 – ‘SDA’. However, MISO is not present, so select ‘None’. Clock is number 3 – ‘SCLK’, and Enable is number 1 – ‘CSX’. <\/span>MSB is transmitted first, 8 bits per transfer, CPOL = 0, CPHA is 0. <\/span>Finally, click on ‘Save’.<\/span><\/span><\/p>\n

    \"Figure
    Figure 10. Analyzer setting<\/span><\/figcaption><\/figure>\n

     <\/p>\n

    Look at Figure 11, it decoded the data line.<\/span><\/p>\n

    \"Testing
    Figure 11. Decoded data line<\/span><\/figcaption><\/figure>\n

     <\/p>\n

    Is it necessary to raise the CS signal between parameter transfers? <\/span><\/p>\n

    I think you can keep this low. You need not deassert and assert again. Because, if you check the timing diagram in the datasheet of ILI9341<\/a><\/span>, and page number 35. It says CSX can be “High” between command\/command and parameter\/command. SCL and SDA during CSX-\u2019H\u2019 is invalid.<\/span><\/p>\n

    \"Testing
    Figure 12. CSX<\/span><\/figcaption><\/figure>\n

     <\/p>\n

    FastBit Embedded Brain Academy Courses<\/b><\/span><\/p>\n

    Click here:<\/span> https:\/\/fastbitlab.com\/course1<\/a><\/span><\/p>\n

     <\/p>\n<\/div>\n

    <\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

      Testing TFT-LCD command sending   In this article, we initialize the SPI peripheral first and then call the function LCD_SPI_Enable() to activate it. The code is shown in Figure 1. It just sets the SPE bit of the control register 1. After that, you reset the board and you send commands to the LCD […]<\/p>\n","protected":false},"author":1,"featured_media":14752,"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-14747","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","entry","has-media"],"yoast_head":"\nOptimizing TFT-LCD Command Transmission for Enhanced Display Control<\/title>\n<meta name=\"description\" content=\"Explore techniques for refining TFT-LCD command transmission by ensuring precise signal timing and data integrity. 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