mi mi / Mbed 2 deprecated SDFileSystemDMA-test Featured

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Dependencies:   SDFileSystemDMA mbed

Refer to:
https://developer.mbed.org/users/mimi3/code/SDFileSystemDMA

Caution

If your board has SRAM less than or equal to 8KB, the 'buffer' size must be set to 512 Bytes.

NUCLEO-F411RE
About 2.5MBytes/sec
/media/uploads/mimi3/sdfilesystemdma-speed-test-teraterm-output-f411re.png
NUCLEO-L152RE
About 1MBytes/sec
/media/uploads/mimi3/sdfilesystemdma-l152re-cui.png

main.cpp@0:8f297fe0c66a, 2016-02-12 (annotated)

Committer:
mimi3
Date:
Fri Feb 12 13:55:01 2016 +0000
Revision:
0:8f297fe0c66a
Child:
1:c39cfc31349d
first push

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mimi3 0:8f297fe0c66a 1 #include "mbed.h"
mimi3 0:8f297fe0c66a 2 #include "SDFileSystemDMA.h"
mimi3 0:8f297fe0c66a 3 #define MOSI D4
mimi3 0:8f297fe0c66a 4 #define MISO D5
mimi3 0:8f297fe0c66a 5 #define SCLK D3
mimi3 0:8f297fe0c66a 6 #define CS D10
mimi3 0:8f297fe0c66a 7 //#define CD D9 // detect SD card insertion. Do open always.
mimi3 0:8f297fe0c66a 8 //#define CD_TYPE SDFileSystem::SWITCH_POS_NC // always instertion state
mimi3 0:8f297fe0c66a 9 //#define SPI_CLOCK_HZ ( 12 * 1000000 )
mimi3 0:8f297fe0c66a 10 Timer timer;
mimi3 0:8f297fe0c66a 11
mimi3 0:8f297fe0c66a 12 SDFileSystem sd( MOSI, MISO, SCLK, CS, "sd");
mimi3 0:8f297fe0c66a 13 //SDFileSystem sd(p5, p6, p7, p8, "sd"); // the pinout on the mbed Cool Components workshop board
mimi3 0:8f297fe0c66a 14 DigitalIn button(USER_BUTTON, PullUp);
mimi3 0:8f297fe0c66a 15
mimi3 0:8f297fe0c66a 16 char buffer[512];
mimi3 0:8f297fe0c66a 17 #define X_MEGA_BYTE ((1)*1024*1024) /* 1Mbyte */
mimi3 0:8f297fe0c66a 18 #define FILE_NAME "GPATH"
mimi3 0:8f297fe0c66a 19
mimi3 0:8f297fe0c66a 20 int base_test() {
mimi3 0:8f297fe0c66a 21
mimi3 0:8f297fe0c66a 22 printf("Hello World!\n");
mimi3 0:8f297fe0c66a 23 while(button);
mimi3 0:8f297fe0c66a 24
mimi3 0:8f297fe0c66a 25 mkdir("/sd/mydirx", 0777);
mimi3 0:8f297fe0c66a 26
mimi3 0:8f297fe0c66a 27 FILE *fp = fopen("/sd/mydirx/sdtest.txt", "w");
mimi3 0:8f297fe0c66a 28 if(fp == NULL) {
mimi3 0:8f297fe0c66a 29 error("Could not open file for write\n");
mimi3 0:8f297fe0c66a 30 }
mimi3 0:8f297fe0c66a 31 fprintf(fp, "Hello fun SD Card World!");
mimi3 0:8f297fe0c66a 32 fclose(fp);
mimi3 0:8f297fe0c66a 33
mimi3 0:8f297fe0c66a 34 printf("Goodbye World!\n");
mimi3 0:8f297fe0c66a 35 return 0;
mimi3 0:8f297fe0c66a 36 }
mimi3 0:8f297fe0c66a 37
mimi3 0:8f297fe0c66a 38 void writeTest()
mimi3 0:8f297fe0c66a 39 {
mimi3 0:8f297fe0c66a 40 //Test write performance by creating a 1MB file
mimi3 0:8f297fe0c66a 41 printf("Testing %dByte buffer: write performance...", sizeof(buffer));
mimi3 0:8f297fe0c66a 42 FileHandle* file = sd.open(FILE_NAME, O_WRONLY | O_CREAT | O_TRUNC);
mimi3 0:8f297fe0c66a 43 if (file != NULL) {
mimi3 0:8f297fe0c66a 44 timer.start();
mimi3 0:8f297fe0c66a 45 for (uint32_t i = 0; i < (X_MEGA_BYTE / sizeof(buffer)); i++) {
mimi3 0:8f297fe0c66a 46 if (file->write(buffer, sizeof(buffer)) != sizeof(buffer)) {
mimi3 0:8f297fe0c66a 47 timer.stop();
mimi3 0:8f297fe0c66a 48 printf("write error!\n");
mimi3 0:8f297fe0c66a 49 timer.reset();
mimi3 0:8f297fe0c66a 50 return;
mimi3 0:8f297fe0c66a 51 }
mimi3 0:8f297fe0c66a 52 }
mimi3 0:8f297fe0c66a 53 timer.stop();
mimi3 0:8f297fe0c66a 54 if (file->close())
mimi3 0:8f297fe0c66a 55 printf("failed to close file!\n");
mimi3 0:8f297fe0c66a 56 else{
mimi3 0:8f297fe0c66a 57 printf("done!\n\tResult: %d KB/s\n", ( 1024 * 1000000 ) / timer.read_us() );
mimi3 0:8f297fe0c66a 58 }
mimi3 0:8f297fe0c66a 59 timer.reset();
mimi3 0:8f297fe0c66a 60 } else {
mimi3 0:8f297fe0c66a 61 printf("failed to create file!\n");
mimi3 0:8f297fe0c66a 62 }
mimi3 0:8f297fe0c66a 63 }
mimi3 0:8f297fe0c66a 64
mimi3 0:8f297fe0c66a 65
mimi3 0:8f297fe0c66a 66 void readTest()
mimi3 0:8f297fe0c66a 67 {
mimi3 0:8f297fe0c66a 68 //Test read performance by reading the 1MB file created by writeTest()
mimi3 0:8f297fe0c66a 69 printf("Testing %dByte buffer: read performance...", sizeof(buffer));
mimi3 0:8f297fe0c66a 70 FileHandle* file = sd.open(FILE_NAME, O_RDONLY);
mimi3 0:8f297fe0c66a 71 if (file != NULL) {
mimi3 0:8f297fe0c66a 72 timer.start();
mimi3 0:8f297fe0c66a 73 int iterations = 0;
mimi3 0:8f297fe0c66a 74 while (file->read(buffer, sizeof(buffer)) == sizeof(buffer))
mimi3 0:8f297fe0c66a 75 iterations++;
mimi3 0:8f297fe0c66a 76 timer.stop();
mimi3 0:8f297fe0c66a 77 if (iterations != (X_MEGA_BYTE / sizeof(buffer))){
mimi3 0:8f297fe0c66a 78 printf("read error!\n");
mimi3 0:8f297fe0c66a 79 }
mimi3 0:8f297fe0c66a 80 else if (file->close()){
mimi3 0:8f297fe0c66a 81 printf("failed to close file!\n");
mimi3 0:8f297fe0c66a 82 }
mimi3 0:8f297fe0c66a 83 // else if (sd.remove(FILE_NAME))
mimi3 0:8f297fe0c66a 84 // printf("failed to delete file!\n");
mimi3 0:8f297fe0c66a 85 else{
mimi3 0:8f297fe0c66a 86 printf("done!\n\tResult: %d KB/s\n", ( 1024 * 1000000 ) / timer.read_us());
mimi3 0:8f297fe0c66a 87 }
mimi3 0:8f297fe0c66a 88 timer.reset();
mimi3 0:8f297fe0c66a 89 } else {
mimi3 0:8f297fe0c66a 90 printf("failed to open file!\n");
mimi3 0:8f297fe0c66a 91 }
mimi3 0:8f297fe0c66a 92 }
mimi3 0:8f297fe0c66a 93
mimi3 0:8f297fe0c66a 94 int main(){
mimi3 0:8f297fe0c66a 95 /* UART Baudrate is 9600bps*/
mimi3 0:8f297fe0c66a 96 while(1){
mimi3 0:8f297fe0c66a 97 printf("\nStart SD card accsess test! -- Press button");
mimi3 0:8f297fe0c66a 98 printf("\nWriting is very slow, wait several minuts.\n");
mimi3 0:8f297fe0c66a 99 while(button);
mimi3 0:8f297fe0c66a 100 writeTest();
mimi3 0:8f297fe0c66a 101 readTest();
mimi3 0:8f297fe0c66a 102 }
mimi3 0:8f297fe0c66a 103 }