Diff: main.cpp

Revision:

0:e674bc8aa29d

Child:

3:2bd1b98de6ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Mar 21 12:16:41 2016 +0000
@@ -0,0 +1,113 @@
+#include "mbed.h"
+#include "SDRAM_DISCO_F746NG.h"
+
+SDRAM_DISCO_F746NG sdram;
+
+DigitalOut led_green(LED1);
+DigitalOut led_red(LED2);
+
+Serial pc(USBTX, USBRX);
+
+#define BUFFER_SIZE         ((uint32_t)0x0100)
+#define WRITE_READ_ADDR     ((uint32_t)0x0800)
+ 
+void FillBuffer(uint32_t *pBuffer, uint32_t BufferLength, uint32_t Offset);
+uint8_t CompareBuffer(uint32_t* pBuffer1, uint32_t* pBuffer2, uint16_t BufferLength);
+ 
+int main()
+{
+    uint32_t WriteBuffer[BUFFER_SIZE];
+    uint32_t ReadBuffer[BUFFER_SIZE];
+    FMC_SDRAM_CommandTypeDef SDRAMCommandStructure;
+  
+    pc.printf("\n\nSDRAM demo started\n");
+    led_red = 0;
+ 
+    // Fill the write buffer
+    FillBuffer(WriteBuffer, BUFFER_SIZE, 0xA244250F);
+  
+    // Write buffer
+    sdram.WriteData(SDRAM_DEVICE_ADDR + WRITE_READ_ADDR, WriteBuffer, BUFFER_SIZE);
+    pc.printf("Write data DONE\n");
+ 
+    // Issue self-refresh command to SDRAM device
+    SDRAMCommandStructure.CommandMode            = FMC_SDRAM_CMD_SELFREFRESH_MODE;
+    SDRAMCommandStructure.CommandTarget          = FMC_SDRAM_CMD_TARGET_BANK2;
+    SDRAMCommandStructure.AutoRefreshNumber      = 1;
+    SDRAMCommandStructure.ModeRegisterDefinition = 0;
+    if (sdram.Sendcmd(&SDRAMCommandStructure) != HAL_OK) 
+    {
+      led_red = 1;
+      error("BSP_SDRAM_Sendcmd FAILED\n");
+    }
+  
+    // SDRAM memory read back access
+    SDRAMCommandStructure.CommandMode = FMC_SDRAM_CMD_NORMAL_MODE;
+    if (sdram.Sendcmd(&SDRAMCommandStructure) != HAL_OK) 
+    {
+      led_red = 1;
+      error("BSP_SDRAM_Sendcmd FAILED\n"); 
+    }
+ 
+    while(1) {
+      
+      // Read back data from the SDRAM memory
+      sdram.ReadData(SDRAM_DEVICE_ADDR + WRITE_READ_ADDR, ReadBuffer, BUFFER_SIZE); 
+      pc.printf("\nRead data DONE\n");
+ 
+      // Checking data integrity 
+      if (CompareBuffer(WriteBuffer, ReadBuffer, BUFFER_SIZE) != 0)
+      {
+        led_red = !led_red;
+        pc.printf("Write/Read buffers are different\n");
+      }
+      else
+      {
+        led_green = !led_green;
+        pc.printf("Write/Read buffers are identical\n");
+      }
+  
+      wait(1);
+    }
+}
+ 
+/**
+  * @brief  Fills buffer with user predefined data.
+  * @param  pBuffer: pointer on the buffer to fill
+  * @param  BufferLength: size of the buffer to fill
+  * @param  Value: first value to fill on the buffer
+  * @retval None
+  */
+void FillBuffer(uint32_t *pBuffer, uint32_t BufferLength, uint32_t Value)
+{
+  uint32_t tmpIndex = 0;
+ 
+  /* Put in global buffer different values */
+  for (tmpIndex = 0; tmpIndex < BufferLength; tmpIndex++ )
+  {
+    pBuffer[tmpIndex] = tmpIndex + Value;
+  }
+} 
+ 
+/**
+  * @brief  Compares two buffers.
+  * @param  pBuffer1, pBuffer2: buffers to be compared.
+  * @param  BufferLength: buffer's length
+  * @retval 0: pBuffer2 identical to pBuffer1
+  *         1: pBuffer2 differs from pBuffer1
+  */
+uint8_t CompareBuffer(uint32_t* pBuffer1, uint32_t* pBuffer2, uint16_t BufferLength)
+{
+  while (BufferLength--)
+  {
+    if (*pBuffer1 != *pBuffer2)
+    {
+      return 1;
+    }
+ 
+    pBuffer1++;
+    pBuffer2++;
+  }
+ 
+  return 0;
+}