Revision 26:86476a8438cb, committed 2021-08-31

Comitter:

greenoaktree

Date:

Tue Aug 31 04:54:03 2021 +0000

Parent:

25:444d09fee172

Commit message:

SDFileSytstem library does not work in Mbed6,this mbed version is ok.; greenoaktree

Changed in this revision

--- a/main.cpp	Mon Aug 29 15:06:56 2016 +0000
+++ b/main.cpp	Tue Aug 31 04:54:03 2021 +0000
@@ -1,41 +1,51 @@
 #include "mbed.h"
 #include "SDFileSystem.h"
 
+
+Serial pc(USBTX,USBRX);
+//SDFileSystem sd(PB_15, PB_14, PB_13, PB_12, "sd",NC,SWITCH_NONE,25000000);
+
+//使用Nucleo-L476RG 的 SPI2 
+//              mosi   miso   sclk   cs
+SDFileSystem sd(PB_15, PB_14, PB_13, PB_12, "sd");  
+//文档里说SDFileSystem 的最高频率就是1MHz,即构造函数的默认参数，这个需要确认一下
+
 Timer timer;
-DigitalIn button(p21, PullUp);
-SDFileSystem sd(p5, p6, p7, p20, "sd", p22, SDFileSystem::SWITCH_NEG_NO, 25000000);
+DigitalIn button(PC_13, PullUp);  //使用Nucleo-L476RG 的 User button 就在PC_13上
+
 char buffer[4096];
 
+
 void writeTest()
 {
     //Test write performance by creating a 1MB file
-    printf("Testing %iB write performance...", sizeof(buffer));
+    pc.printf("Testing %iB write performance...", sizeof(buffer));
     FileHandle* file = sd.open("Test File.bin", O_WRONLY | O_CREAT | O_TRUNC);
     if (file != NULL) {
         timer.start();
         for (int i = 0; i < (1048576 / sizeof(buffer)); i++) {
             if (file->write(buffer, sizeof(buffer)) != sizeof(buffer)) {
                 timer.stop();
-                printf("write error!\n");
+                pc.printf("write error!\n");
                 timer.reset();
                 return;
             }
         }
         timer.stop();
         if (file->close())
-            printf("failed to close file!\n");
+            pc.printf("failed to close file!\n");
         else
-            printf("done!\n\tResult: %.2fKB/s\n", 1024 / (timer.read_us() / 1000000.0));
+            pc.printf("done!\n\tResult: %.2fKB/s\n", 1024 / (timer.read_us() / 1000000.0));
         timer.reset();
     } else {
-        printf("failed to create file!\n");
+        pc.printf("failed to create file!\n");
     }
 }
 
 void readTest()
 {
     //Test read performance by reading the 1MB file created by writeTest()
-    printf("Testing %iB read performance...", sizeof(buffer));
+    pc.printf("Testing %iB read performance...", sizeof(buffer));
     FileHandle* file = sd.open("Test File.bin", O_RDONLY);
     if (file != NULL) {
         timer.start();
@@ -44,20 +54,20 @@
             iterations++;
         timer.stop();
         if (iterations != (1048576 / sizeof(buffer)))
-            printf("read error!\n");
+            pc.printf("read error!\n");
         else if (file->close())
-            printf("failed to close file!\n");
+            pc.printf("failed to close file!\n");
         else if (sd.remove("Test File.bin"))
-            printf("failed to delete file!\n");
+            pc.printf("failed to delete file!\n");
         else
-            printf("done!\n\tResult: %.2fKB/s\n", 1024 / (timer.read_us() / 1000000.0));
+            pc.printf("done!\n\tResult: %.2fKB/s\n", 1024 / (timer.read_us() / 1000000.0));
         timer.reset();
     } else {
-        printf("failed to open file!\n");
+        pc.printf("failed to open file!\n");
     }
 }
 
-int main()
+int main1()
 {
     //Configure CRC, large frames, and write validation
     sd.crc(true);
@@ -74,44 +84,52 @@
         wait(0.5);
 
         //Print the start message
-        printf("\nPress the button to perform tests: ");
+        pc.printf("\nPress the button to perform tests: ");
 
         //Wait for the button to be pressed
         while(button);
 
         //Make sure a card is present
         if (!sd.card_present()) {
-            printf("\nNo card present!\n");
+            pc.printf("\nNo card present!\n");
             continue;
         }
-
+        
+        //挂载SD卡，失败，原因不明，但是即使不挂载，后续的读写文件操作也能正常进行
+/*
         //Try to mount the SD card
         printf("\nMounting SD card...");
         if (sd.mount() != 0) {
-            printf("failed!\n");
+            pc.printf("failed!\n");
             continue;
         }
-        printf("success!\n");
-
+        pc.printf("success!\n");
+*/
+    
+    
+        //卡类型也不能识别，原因不明
         //Display the card type
-        printf("\tCard type: ");
+        pc.printf("\tCard type: ");
         SDFileSystem::CardType cardType = sd.card_type();
         if (cardType == SDFileSystem::CARD_NONE)
-            printf("None\n");
+            pc.printf("None\n");
         else if (cardType == SDFileSystem::CARD_MMC)
-            printf("MMC\n");
+            pc.printf("MMC\n");
         else if (cardType == SDFileSystem::CARD_SD)
-            printf("SD\n");
+            pc.printf("SD\n");
         else if (cardType == SDFileSystem::CARD_SDHC)
-            printf("SDHC\n");
+            pc.printf("SDHC\n");
         else
-            printf("Unknown\n");
+            pc.printf("Unknown\n");
 
+        //卡的扇区数，容量也不能正确获取，原因不明
         //Display the card capacity
-        printf("\tSectors: %u\n", sd.disk_sectors());
-        printf("\tCapacity: %.1fMB\n", sd.disk_sectors() / 2048.0);
+        pc.printf("\tSectors: %u\n", sd.disk_sectors());
+        pc.printf("\tCapacity: %.1fMB\n", sd.disk_sectors() / 2048.0);
 
-        /*//Format the card
+        
+        //格式化，但是格式化一个8G的盘我是没等到结束
+        /* //Format the card
         printf("Formatting SD card...");
         if (sd.format() != 0) {
             printf("failed!\n");
@@ -119,6 +137,7 @@
         }
         printf("success!\n");*/
 
+        //读写测试，即使前面的挂载等操作不能正常运行，读写测试也可以正常运行
         //Perform a read/write test
         writeTest();
         readTest();
@@ -127,3 +146,26 @@
         sd.unmount();
     }
 }
+
+
+int main() {
+     
+    pc.printf("SD card test!\r\n");   
+
+    //建立文件夹
+    mkdir("/sd/mydir", 0777);
+
+    //追加方式打开或创建文件，写入数据
+    FILE *fp = fopen("/sd/1.txt", "a");
+    if(fp == NULL) {
+        pc.printf("Could not open file for write\r\n"); 
+    }
+    fprintf(fp, "Hello fun SD Card World!\r\n");
+    fclose(fp);
+    pc.printf("File successfully written and closed!\r\n");
+    
+    //写测试
+    writeTest();
+    //读测试
+    readTest();
+}
\ No newline at end of file