Beschreibung :<\/strong><\/p>\n Mit dieser Library kann das externe SD-RAM auf dem STM32F746 Discovery-Board benutzt werden.<\/p>\n Das RAM hat eine Speichergr\u00f6\u00dfe von 128MBit (8MByte nutzbar) und h\u00e4ngt am FMC-Bus der CPU. Ich habe mehrere Funktionen geschrieben um Daten auf das RAM zu lesen und zu schreiben.<\/p>\n Module :<\/strong><\/p>\n Includes :<\/strong><\/p>\n Defines :<\/strong><\/p>\n Funktionen :<\/strong><\/p>\n Beispiel :<\/strong><\/p>\n Hier die Library zum\u00a0Download :<\/strong><\/p>\n 03 = SDRAM :\u00a0f746_sdram_v100<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" Beschreibung : Mit dieser Library kann das externe SD-RAM auf dem STM32F746 Discovery-Board benutzt werden. Das RAM hat eine Speichergr\u00f6\u00dfe von 128MBit (8MByte nutzbar) und h\u00e4ngt am FMC-Bus der CPU. Ich habe mehrere Funktionen geschrieben um Daten auf das RAM … Weiterlesen →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":182,"menu_order":3,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[130],"tags":[9,154,105],"class_list":["post-1391","page","type-page","status-publish","hentry","category-stm32f746","tag-library","tag-sdram","tag-stm32f746"],"_links":{"self":[{"href":"https:\/\/mikrocontroller.bplaced.net\/wordpress\/index.php?rest_route=\/wp\/v2\/pages\/1391","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mikrocontroller.bplaced.net\/wordpress\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/mikrocontroller.bplaced.net\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/mikrocontroller.bplaced.net\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mikrocontroller.bplaced.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1391"}],"version-history":[{"count":7,"href":"https:\/\/mikrocontroller.bplaced.net\/wordpress\/index.php?rest_route=\/wp\/v2\/pages\/1391\/revisions"}],"predecessor-version":[{"id":1549,"href":"https:\/\/mikrocontroller.bplaced.net\/wordpress\/index.php?rest_route=\/wp\/v2\/pages\/1391\/revisions\/1549"}],"up":[{"embeddable":true,"href":"https:\/\/mikrocontroller.bplaced.net\/wordpress\/index.php?rest_route=\/wp\/v2\/pages\/182"}],"wp:attachment":[{"href":"https:\/\/mikrocontroller.bplaced.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1391"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mikrocontroller.bplaced.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1391"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mikrocontroller.bplaced.net\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1391"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}stm32_ub_sdram.h, stm32_ub_sdram.c\r\n<\/pre>\n
#include \"stm32_ub_system.h\"\r\n<\/pre>\n
#define SDRAM_MAX_ADR 0x800000 \/\/ max=8MByte\r\n#define SDRAM_START_ADR ((uint32_t)0xC0000000)\r\n\r\n#define SDRAM_MEMORY_WIDTH FMC_SDRAM_MEM_BUS_WIDTH_16\r\n#define SDCLOCK_PERIOD FMC_SDRAM_CLOCK_PERIOD_2\r\n#define SDRAM_TIMEOUT ((uint32_t)0xFFFF)\r\n#define REFRESH_COUNT ((uint32_t)0x0603)\r\n\r\n#define SDRAM_MODEREG_BURST_LENGTH_1 ((uint16_t)0x0000)\r\n#define SDRAM_MODEREG_BURST_LENGTH_2 ((uint16_t)0x0001)\r\n#define SDRAM_MODEREG_BURST_LENGTH_4 ((uint16_t)0x0002)\r\n#define SDRAM_MODEREG_BURST_LENGTH_8 ((uint16_t)0x0004)\r\n#define SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL ((uint16_t)0x0000)\r\n#define SDRAM_MODEREG_BURST_TYPE_INTERLEAVED ((uint16_t)0x0008)\r\n#define SDRAM_MODEREG_CAS_LATENCY_2 ((uint16_t)0x0020)\r\n#define SDRAM_MODEREG_CAS_LATENCY_3 ((uint16_t)0x0030)\r\n#define SDRAM_MODEREG_OPERATING_MODE_STANDARD ((uint16_t)0x0000)\r\n#define SDRAM_MODEREG_WRITEBURST_MODE_PROGRAMMED ((uint16_t)0x0000)\r\n#define SDRAM_MODEREG_WRITEBURST_MODE_SINGLE ((uint16_t)0x0200)\r\n<\/pre>\n
ErrorStatus UB_SDRAM_Init(void);\r\nvoid UB_SDRAM_Write8b(uint32_t adr, uint8_t wert);\r\nuint8_t UB_SDRAM_Read8b(uint32_t adr);\r\nvoid UB_SDRAM_Write16b(uint32_t adr, uint16_t wert);\r\nuint16_t UB_SDRAM_Read16b(uint32_t adr);\r\nvoid UB_SDRAM_Write32b(uint32_t adr, uint32_t wert);\r\nuint32_t UB_SDRAM_Read32b(uint32_t adr);\r\nErrorStatus UB_SDRAM_WriteBuffer32b(uint32_t* ptrBuffer, uint32_t startAdr, uint32_t lenBuffer);\r\nErrorStatus UB_SDRAM_ReadBuffer32b(uint32_t* ptrBuffer, uint32_t startAdr, uint32_t lenBuffer);\r\n<\/pre>\n
\/\/--------------------------------------------------------------\r\n\/\/ File : main.c\r\n\/\/ Datum : 01.01.2016\r\n\/\/ Version : 1.0\r\n\/\/ Autor : UB\r\n\/\/ EMail : mc-4u(@)t-online.de\r\n\/\/ Web : www.mikrocontroller-4u.de\r\n\/\/ CPU : STM32F746\r\n\/\/ Board : STM32F746-Discovery-Board\r\n\/\/ IDE : OpenSTM32\r\n\/\/ GCC : 4.9 2015q2\r\n\/\/ Module : CubeHAL\r\n\/\/ Funktion : Hauptprogramm\r\n\/\/--------------------------------------------------------------\r\n\r\n\r\n#include \"stm32_ub_system.h\"\r\n#include \"stm32_ub_sdram.h\"\r\n#include \"stm32_ub_led.h\"\r\n\r\nint main(void)\r\n{\r\n uint32_t adr;\r\n uint8_t sollwert, istwert;\r\n ErrorStatus ramcheck;\r\n\r\n \/\/ init vom System\r\n UB_System_Init(); \/\/ Quarz Einstellungen aktivieren\r\n\r\n \/\/ init der LEDs\r\n UB_Led_Init();\r\n\r\n \/\/ init vom externen SDRAM (und test ob es vorhanden ist)\r\n ramcheck=UB_SDRAM_Init();\r\n if(ramcheck==SUCCESS) {\r\n \/\/ zum test RAM komplett f\u00fcllen\r\n sollwert=0xA1B2;\r\n for(adr=0;adr<SDRAM_MAX_ADR;adr+=2) {\r\n \t UB_SDRAM_Write16b(adr,sollwert);\r\n sollwert++;\r\n }\r\n\r\n \/\/ Ram wieder auslesen und pr\u00fcfen\r\n sollwert=0xA1B2;\r\n for(adr=0;adr<SDRAM_MAX_ADR;adr+=2) {\r\n istwert=UB_SDRAM_Read16b(adr);\r\n if(istwert!=sollwert) {\r\n \/\/ RAM-Inhalt fehlerhaft\r\n ramcheck=ERROR;\r\n }\r\n sollwert++;\r\n }\r\n }\r\n\r\n while(1) {\r\n if(ramcheck==SUCCESS) {\r\n \/\/ wenn kein Fehler -> gruene LED leuchtet\r\n UB_Led_On(LED_GREEN);\r\n }\r\n else {\r\n \/\/ wenn Fehler -> gruene LED blinkt\r\n UB_Led_Toggle(LED_GREEN);\r\n HAL_Delay(500); \/\/Delay in ms\r\n }\r\n }\r\n}\r\n<\/pre>\n