{"id":2324,"date":"2019-07-03T11:39:16","date_gmt":"2019-07-03T11:39:16","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=2324"},"modified":"2022-12-20T17:13:11","modified_gmt":"2022-12-20T11:43:11","slug":"alternate-functionality-setting-gpio","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/alternate-functionality-setting-gpio\/","title":{"rendered":"STM32 GPIO Lecture 19 : Alternate functionality setting of GPIO pin with example"},"content":{"rendered":"
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 <\/div>\n
\n

 <\/h2>\n

Alternate functionality setting of GPIO pin with example<\/span><\/h2>\n
\n
\n
\n<\/div>\n<\/div>\n

 <\/p>\n

When GPIO pin is in alternate functionality mode, it can be used for 16 different functionalities from AF0 to AF15. These possible 16 different functionalities are, used for system-related tasks, used by the timer peripherals, used by SPI or I2C peripherals and also for audio interfaces. <\/span><\/p>\n

 <\/p>\n

\"Alternate
Figure 1. 16 Different Alternate functionalities<\/span><\/figcaption><\/figure>\n

 <\/p>\n

Example: List out all 16 possible alternate functionalities supported by GPIO port \u2018A\u2019 PIN \u20188\u2019 (GPIOA.8)<\/span><\/p>\n

For GPIOA.8,<\/span><\/p>\n

For AFO: MCO1 <\/span><\/p>\n

For   AF1: TIM1_CH1. <\/span><\/p>\n

For   AF2: – (Not defined, behaves as standard GPIO).<\/span><\/p>\n

For   AF3: – (Not defined, behaves as standard GPIO).<\/span><\/p>\n

For   AF4: – I 2C3_SCL.<\/span><\/p>\n

For   AF5: – (Not defined, behaves as standard GPIO).<\/span><\/p>\n

For   AF6: – (Not defined, behaves as standard GPIO).<\/span><\/p>\n

For   AF7: – USART1_CK<\/span><\/p>\n

For   AF8: – (Not defined, behaves as standard GPIO).<\/span><\/p>\n

For   AF9: – (Not defined, behaves as standard GPIO).<\/span><\/p>\n

For AF10:-   OTG_FS_SOF<\/span><\/p>\n

For AF11: – (Not defined, behaves as standard GPIO).<\/span><\/p>\n

For AF12: – (Not defined, behaves as standard GPIO).<\/span><\/p>\n

For AF13: – (Not defined, behaves as standard GPIO).<\/span><\/p>\n

For AF14: – (Not defined, behaves as standard GPIO).<\/span><\/p>\n

For AF15:-  EVENT OUT<\/span><\/p>\n

 <\/p>\n

\"Alternate
Figure 2. Alternate Function Mapping<\/span><\/figcaption><\/figure>\n

 <\/span><\/p>\n

In the following article, let’s see<\/span> Enabling and disabling GPIO peripheral clock<\/a>.<\/span><\/strong><\/p>\n

 <\/p>\n

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

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

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

    Alternate functionality setting of GPIO pin with example   When GPIO pin is in alternate functionality mode, it can be used for 16 different functionalities from AF0 to AF15. These possible 16 different functionalities are, used for system-related tasks, used by the timer peripherals, used by SPI or I2C peripherals and also for […]<\/p>\n","protected":false},"author":1,"featured_media":2317,"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":[20],"class_list":["post-2324","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-stm32-gpio","entry","has-media"],"yoast_head":"\nAlternate functionality setting of GPIO pin with example | STM32 GPIO<\/title>\n<meta name=\"description\" content=\"When GPIO pin is in alternate functionality mode it can be used for 16 different functionalities from AF0 to AF15. 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