Revision 0:947ff5fa24c6, committed 2013-12-31

Comitter:

loopsva

Date:

Tue Dec 31 17:38:48 2013 +0000

Child:

1:b2b9d3920781

Commit message:

Initial release of a demonstration memory test for the LPC4088.

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/EALib.lib	Tue Dec 31 17:38:48 2013 +0000
@@ -0,0 +1,1 @@
+https://mbed.org/users/embeddedartists/code/EALib/#3839113c5abc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Dec 31 17:38:48 2013 +0000
@@ -0,0 +1,101 @@
+#include "mbed.h"
+#include "sdram.h"
+
+Serial pc(USBTX, USBRX);                    //Serial USB communications over mbed USB port
+DigitalOut led1(LED1);
+
+//--------------------------------------------------------------------------------------------------------------------------------------//
+//Test the SDRAM array with pseudo-random data
+//memory size = 0x00800000 (8388608 locations * 4 bytes wide = 33.554432 MB
+
+#define DRAMBASEADDR    0xa0000000
+#define DRAMSIZE        0x00800000
+
+int testSDRAM(uint32_t seed) {
+    volatile uint32_t * const ramBaseAddr = (uint32_t *) DRAMBASEADDR;
+    uint32_t lfsr = seed;
+    uint32_t offsAddr = 0;
+    
+    //Fill all memory with pseudo-random data   
+    pc.printf(" - Filling all memory, starting with PR seed 0x%08x...   ", lfsr);
+    for(offsAddr = 0; offsAddr < DRAMSIZE; offsAddr += 4) {
+        lfsr = (lfsr >> 1) ^ (-(lfsr & 1u) & 0xD0000001u); 
+        ramBaseAddr[offsAddr] = lfsr;
+    }
+              
+    //force error at highest memory location
+    //ramBaseAddr[0x007ffffc] = 0x12345678;
+            
+    //Now compare all that has been written
+    pc.printf("done\r\n - Comparing all memory locations...   ");
+    lfsr = seed;
+    for(offsAddr = 0; offsAddr < DRAMSIZE; offsAddr += 4) {
+        lfsr = (lfsr >> 1) ^ (-(lfsr & 1u) & 0xD0000001u); 
+        if(ramBaseAddr[offsAddr] != lfsr) {
+            pc.printf("\r\n### Memory compare error!!!  addr: %08x  sent: %08x  recvd: %08x\r\n", offsAddr + DRAMBASEADDR, lfsr, ramBaseAddr[offsAddr]);
+            return -1;
+        }
+    }
+            
+    //print first DRAM locations
+    pc.printf("done\r\n");
+    
+    //Option to print out first few locations of SDRAM
+    //for(offsAddr = 0; offsAddr < 1024; offsAddr += 16) {
+    //    pc.printf("addr: %08x  0: %08x  4: %08x  8: %08x  c: %08x\r\n", DRAMBASEADDR + offsAddr, ramBaseAddr[offsAddr], 
+    //                ramBaseAddr[offsAddr + 4], ramBaseAddr[offsAddr + 8], ramBaseAddr[offsAddr + 12]);
+    //}
+    return 0;
+}
+
+//--------------------------------------------------------------------------------------------------------------------------------------//
+//Initialize the 32MB SDRAM and test it.
+
+#define ONEMBDRAMSIZE (1024*1024)
+
+int alloccount = 0;
+unsigned char *ptr[100] ;
+
+int initSDRAM() {
+    pc.printf("Initializing 32MB SDRAM\r\n");
+    if (sdram_init() == 1) {
+        pc.printf(" - Failed to initialize SDRAM\r\n");
+        return 1;
+    }
+    
+    while(1) { 
+        ptr[alloccount] = (unsigned char *)malloc(ONEMBDRAMSIZE);
+        //pc.printf (" - Allocated Address = %08x   %2d\r\n", ptr[alloccount], alloccount);
+        if(ptr[alloccount] == NULL) {
+            pc.printf(" - Maximum allocatable DRAM memory %dMB\r\n", alloccount);
+            for (int i = 0; i < alloccount; i++) {
+                free(ptr[i]);
+            }
+            alloccount = 0;
+            uint32_t StartSeed = 0xbad1deaf;
+            int testresult = testSDRAM(StartSeed);
+            if(testresult) return(testresult);
+            break;
+        } else {
+            alloccount++ ;
+        }
+    }
+    return 0;
+}
+
+//--------------------------------------------------------------------------------------------------------------------------------------//
+//--------------------------------------------------------------------------------------------------------------------------------------//
+ 
+int main(void) {
+   
+    pc.baud(460800);  
+    pc.printf("\r\n\r\nLPC4088 SDRAM memory test\r\n");
+    initSDRAM(); 
+
+    while(1) {
+        wait_ms(500);
+        led1 = !led1;
+    }
+}
+
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Dec 31 17:38:48 2013 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/a9913a65894f
\ No newline at end of file