{"id":2787,"date":"2019-07-12T08:44:02","date_gmt":"2019-07-12T08:44:02","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=2787"},"modified":"2022-11-23T16:59:37","modified_gmt":"2022-11-23T11:29:37","slug":"importance-spi-slave-select-pin","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/importance-spi-slave-select-pin\/","title":{"rendered":"STM32 SPI Lecture 3 : Importance of SPI slave select pin"},"content":{"rendered":"<div class=\"boldgrid-section\" style=\"background-image: linear-gradient(to left, #eeeeee, #eeeeee);\" data-bg-color-1=\"#EEEEEE\" data-bg-color-2=\"#EEEEEE\" data-bg-direction=\"to left\">\n<div class=\"container\">\n<div class=\"row\" style=\"padding-top: 50px; padding-bottom: 50px;\">\n<div class=\"col-md-1 col-sm-12 col-xs-12 col-lg-1\">\n<p>&nbsp;<\/p>\n<\/div>\n<div class=\"col-md-10 col-sm-12 col-xs-12 col-lg-10\">\n<h1 class=\"\" style=\"text-align: center; border-width: 0px; font-size: 35px; line-height: 50px;\"><span style=\"color: #000080;\">Importance of SPI slave select pin<\/span><\/h1>\n<div class=\"row bg-editor-hr-wrap\" style=\"border-width: 0px; margin-top: -25px;\">\n<div class=\"col-lg-12 col-md-12 col-xs-12 col-sm-12\">\n<p>&nbsp;<\/p>\n<div class=\"bg-hr bg-hr-10 color2-color\" style=\"border-style: solid; border-width: 0px 0px 3px;\"><\/div>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<div class=\"row bg-editor-hr-wrap\">\n<hr>\n<\/div>\n<p class=\"\" style=\"font-size: 23px; border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; line-height: 35px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"text-decoration: underline;\"><strong><span style=\"color: #000080; text-decoration: underline;\">Importance of SPI slave select pin<\/span><\/strong><\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">Chip select (CS) or slave select (SS) is the name of a control line in the <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"http:\/\/fastbitlab.com\/introduction-spi-bus-2\/\" target=\"_blank\" rel=\"noopener\">SPI bus<\/a><\/span> used to select one (or a set) of the slave device (commonly called &#8220;chips&#8221;) out of several slave devices connected to the same master device.<\/span><\/p>\n<figure id=\"attachment_2789\" aria-describedby=\"caption-attachment-2789\" style=\"width: 1405px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-2789 size-full\" src=\"http:\/\/fastbitlab.com\/wp-content\/uploads\/2019\/07\/Screenshot-159.png\" alt=\"Importance of slave select pin\" width=\"1405\" height=\"579\" srcset=\"https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-159.png 1405w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-159-300x124.png 300w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-159-768x316.png 768w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-159-1024x422.png 1024w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-159-600x247.png 600w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-159-120x49.png 120w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-159-500x206.png 500w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-159-200x82.png 200w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-159-400x165.png 400w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-159-800x330.png 800w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-159-1200x495.png 1200w\" sizes=\"(max-width: 1405px) 100vw, 1405px\" \/><figcaption id=\"caption-attachment-2789\" class=\"wp-caption-text\"><span style=\"color: #000000;\">Figure 1. Single Master and Single slave devices.<\/span><\/figcaption><\/figure>\n<p class=\"\">&nbsp;<\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">From Figure 1. There is one master device and one slave device and to use the SPI communication between these devices, then both master and slave must support the SPI peripheral or the SPI interface. If the slave doesn\u2019t help SPI interface, then SPI communication between the master and the slave is not possible.<\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">So, when a master wants to communicate with a slave, the first thing master does is, it selects the slave. So, that means the master uses one of its GPIO pins to pull the slave select (SS) pin of the slave to ground. <\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">When the SS pin of the slave pulled to ground, then the only slave will activate the data pins that is, MOSI and MISO pin. Unless slave select pin pulled to 0 or ground, the slave would not enable data communication between master and slave devices because the data pins are in high impedance state or Hi-Z state until the SS pin is 0. So, when master pulls SS pin to ground, then data pins are come out of Hi-Z state.<\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">By connecting GPIO pins of the master to the slave, the program has to select the slave by pulling the slave select to ground. Then the master can send the data as well as receive the data from the slave. Master will send the data to the slave, and the clock must carry along with the data. That means the data communication must be synchronized with the clock signal.<\/span><\/p>\n<p class=\"\">&nbsp;<\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\">In the following article, let&#8217;s see <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"http:\/\/fastbitlab.com\/spi-minimal-bus-configuration\/\" target=\"_blank\" rel=\"noopener\">SPI minimal bus configuration<\/a><\/span>.<\/p>\n<p class=\"\">&nbsp;<\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 20px; line-height: 25px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"color: #000080;\"><b>FastBit Embedded Brain Academy Courses<\/b><\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: Roboto; font-weight: 400; font-size: 17px;\" data-font-family=\"Roboto\" data-font-weight=\"400\" data-font-style=\"\">Click here:&nbsp;<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"http:\/\/fastbitlab.com\/course1\" target=\"_blank\" rel=\"noopener\">https:\/\/fastbitlab.com\/course1<\/a><\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; Importance of SPI slave select pin &nbsp; &nbsp; Importance of SPI slave select pin Chip select (CS) or slave select (SS) is the name of a control line in the SPI bus used to select one (or a set) of the slave device (commonly called &#8220;chips&#8221;) out of several slave devices connected to the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2789,"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":[21],"class_list":["post-2787","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-stm32-spi","entry","has-media"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>STM32 SPI Lecture 3 : Importance of SPI slave select pin<\/title>\n<meta name=\"description\" content=\"Importance of SPI slave select pin. 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