{"id":64,"date":"2024-02-26T12:03:14","date_gmt":"2024-02-26T11:03:14","guid":{"rendered":"https:\/\/www.embarque.ch\/blog\/?p=64"},"modified":"2025-03-21T08:57:34","modified_gmt":"2025-03-21T07:57:34","slug":"troubleshooting-system-freezes-sd-card-access-on-nxp-lpc1788-with-chan-fatfs","status":"publish","type":"post","link":"https:\/\/www.embarque.ch\/blog\/2024\/02\/26\/troubleshooting-system-freezes-sd-card-access-on-nxp-lpc1788-with-chan-fatfs","title":{"rendered":"SD card access freeze on LPC1788 with Chan FatFS"},"content":{"rendered":"\n<p>While using <a href=\"http:\/\/elm-chan.org\/fsw\/ff\/\" data-type=\"link\" data-id=\"http:\/\/elm-chan.org\/fsw\/ff\/\">Chan FatFS library<\/a>, I encountered frequent system freezes on my <a href=\"https:\/\/www.olimex.com\/Products\/Modules\/LCD\/MOD-LCD4.3%27%27\/open-source-hardware\" data-type=\"link\" data-id=\"https:\/\/www.olimex.com\/Products\/Modules\/LCD\/MOD-LCD4.3%27%27\/open-source-hardware\">MOD-LCD4.3 board<\/a> when performing read or write operations on the SD card. The board, which is based on the LPC1788 Cortex M-3, features an SD card connector. <\/p>\n\n\n\n<p>The system is running FreeRTOS and utilizes the MCI interface from NXP (<a href=\"https:\/\/github.com\/EdizonTN\/ARM-FNET-LPC-1788-SK_\/blob\/master\/ARM-FNET-LPC-1788-SK\/Chip\/Driver\/Source\/lpc177x_8x_mci.c\" data-type=\"link\" data-id=\"https:\/\/github.com\/EdizonTN\/ARM-FNET-LPC-1788-SK_\/blob\/master\/ARM-FNET-LPC-1788-SK\/Chip\/Driver\/Source\/lpc177x_8x_mci.c\">lpc177x_8x_mci.c<\/a>) in DMA mode for SD card access with a custom low-level driver which implements disk_status(), disk_initialize(), disk_read(), disk_write(), and disk_ioctl() operations.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"245\" height=\"220\" src=\"https:\/\/www.embarque.ch\/blog\/wp-content\/uploads\/2024\/02\/layers1.png\" alt=\"\" class=\"wp-image-65\"\/><figcaption class=\"wp-element-caption\">ChaN&rsquo;s FatFs interface<\/figcaption><\/figure>\n\n\n\n<p>The freeze was not systematic, and each time it occurred, the system was stuck at MCI_GetDataXferEndState() during disk_read() and disk_write() operations. Furthermore, its frequency tended to increase with the system workload.<\/p>\n\n\n\n<p>To fix the issue:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Increase delay on <a href=\"https:\/\/github.com\/EdizonTN\/ARM-FNET-LPC-1788-SK_\/blob\/master\/ARM-FNET-LPC-1788-SK\/Chip\/Driver\/Include\/lpc177x_8x_mci.h\">lpc177x_8x_mci.h<\/a>:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code><code>#define DATA_TIMER_VALUE 0x10000<\/code><\/code><\/pre>\n\n\n\n<p>to<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><code><code>#define DATA_TIMER_VALUE 0xF0000<\/code><\/code><\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Suspend the scheduler keeping interrupts; if you are using FreeRTOS:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>vTaskSuspendAll();\nSD_card_access_task();\nxTaskResumeAll();<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>While using Chan FatFS library, I encountered frequent system freezes on my MOD-LCD4.3 board when performing read or write operations on the SD card. The board, which is based on the LPC1788 Cortex M-3, features an SD card connector. The system is running FreeRTOS and utilizes the MCI interface from NXP (lpc177x_8x_mci.c) in DMA mode for SD card access with a custom low-level driver which implements disk_status(), disk_initialize(), disk_read(), disk_write(), and disk_ioctl() operations. The freeze was not systematic, and each <a href=\"https:\/\/www.embarque.ch\/blog\/2024\/02\/26\/troubleshooting-system-freezes-sd-card-access-on-nxp-lpc1788-with-chan-fatfs\" class=\"more-link\">&#8230;<span class=\"screen-reader-text\">  SD card access freeze on LPC1788 with Chan FatFS<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":65,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,6,9],"tags":[],"class_list":["post-64","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-debug","category-microcontroleur","category-os-temps-reel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SD card access freeze on LPC1788 with Chan FatFS - Blog<\/title>\n<meta name=\"description\" content=\"Resolve SD card freeze issues on LPC1788 during read or write operations FreeRTOS.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.embarque.ch\/blog\/2024\/02\/26\/troubleshooting-system-freezes-sd-card-access-on-nxp-lpc1788-with-chan-fatfs\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SD card access freeze on LPC1788 with Chan FatFS - 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