{"id":4879,"date":"2021-01-12T11:02:06","date_gmt":"2021-01-12T11:02:06","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=4879"},"modified":"2022-11-23T09:57:12","modified_gmt":"2022-11-23T04:27:12","slug":"stm32-i2c-lecture-54-exercise-testing-i2c-interrupt-apis-part-2","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/stm32-i2c-lecture-54-exercise-testing-i2c-interrupt-apis-part-2\/","title":{"rendered":"STM32 I2C Lecture 54 – Exercise: Testing I2C interrupt APIs part 2"},"content":{"rendered":"
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 <\/p>\n<\/div>\n

\n

Exercise: Testing I2C interrupt APIs part 2<\/span><\/h1>\n
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 <\/p>\n

<\/div>\n

 <\/p>\n<\/div>\n<\/div>\n<\/div>\n

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\n<\/div>\n

Now let\u2019s check whether the ACK failure in the code (Figure 1) is called or not.<\/span><\/p>\n

\"Exercise:
Figure 1. Code to handle ACK failure.<\/span><\/figcaption><\/figure>\n

 <\/p>\n

Steps to check whether the ACK failure is called are not:<\/b><\/span><\/p>\n

1. In the master code, change the slave address, as shown in Figure 2.<\/span><\/p>\n

\"Exercise:
Figure 2. Changing the slave address from 0x68 to 0x66.<\/span><\/figcaption><\/figure>\n

When you change the slave address to 0x66, it will result in an ACK failure because there is no device with address 0x66 is present in the connection.<\/span><\/p>\n

 <\/p>\n

2. Make sure that in the printf statement shown in Figure 2, the string is terminated by the \\n; otherwise, semi hosting will face problems. When you use semi hosting, if the string is not terminated with \\n, then the printf statement will not work.<\/span><\/span><\/p>\n

\"\"
Figure 3. Statement to print the ACK failure message.<\/span><\/figcaption><\/figure>\n

 <\/p>\n

3. Compile the code (Figure 4) and see how it behaves.<\/span><\/span><\/p>\n

\"Exercise:
Figure 4. Code compilation.<\/span><\/figcaption><\/figure>\n

 <\/p>\n

4.  Program the chip (Figure 5).<\/span><\/span><\/p>\n

\"Exercise:
Figure 5. Programming the chip.<\/span><\/figcaption><\/figure>\n

 <\/p>\n

5. Go to the debugging mode (Figure 6).<\/span><\/span><\/p>\n

\"Exercise:
Figure 6. Debug mode.<\/span><\/figcaption><\/figure>\n

 <\/p>\n

6. Run the application by clicking the run button, shown in Figure 7.<\/span><\/span><\/p>\n

\"Exercise:
Figure 7. Run the application.<\/span><\/figcaption><\/figure>\n

 <\/p>\n

7. The application is running now. Let\u2019s press the user button. Look at Figure 8. The error message ACK failure is displayed on the console or output pane, and the program hangs in the while loop.<\/span><\/span><\/p>\n

\"Exercise:
Figure 8. Error message ACK failure is displayed on the console.<\/span><\/figcaption><\/figure>\n

 <\/p>\n

8. Take a look into the trace shown in Figure 9. First, the address 0x66 is generated, then the NACK is received for that. After that, the program hangs in the loop for a while, and then the communication is closed by releasing the SCL and SDA lines.<\/span><\/span><\/p>\n

\"Exercise:
Figure 9. I2C trace of the application.<\/span><\/figcaption><\/figure>\n

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

  Exercise: Testing I2C interrupt APIs part 2     Now let\u2019s check whether the ACK failure in the code (Figure 1) is called or not.   Steps to check whether the ACK failure is called are not: 1. In the master code, change the slave address, as shown in Figure 2. When you change […]<\/p>\n","protected":false},"author":1,"featured_media":4886,"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":[23],"class_list":["post-4879","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-stm32-i2c-lectures","entry","has-media"],"yoast_head":"\nSTM32 I2C Lecture 54 - Exercise: Testing I2C interrupt APIs part 2<\/title>\n<meta name=\"description\" content=\"Exercise: Testing I2C interrupt APIs part 2. 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