ST
DISCO_F469NI SDRAM basic example
Dependencies: BSP_DISCO_F469NI SDRAM_DISCO_F469NI mbed
Revision 0:1524912059d3, committed 2016-03-18
- Comitter:
- adustm
- Date:
- Fri Mar 18 09:43:21 2016 +0000
- Child:
- 1:be9b0abe44d9
- Commit message:
- Example for SDRAM
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/BSP_DISCO_F469NI.lib Fri Mar 18 09:43:21 2016 +0000 @@ -0,0 +1,1 @@ +https://developer.mbed.org/teams/ST/code/BSP_DISCO_F469NI/#0002c86c2220
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SDRAM_DISCO_F469NI.lib Fri Mar 18 09:43:21 2016 +0000 @@ -0,0 +1,1 @@ +SDRAM_DISCO_F469NI#8dee094d9554
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Mar 18 09:43:21 2016 +0000
@@ -0,0 +1,114 @@
+#include "mbed.h"
+#include "SDRAM_DISCO_F469NI.h"
+
+SDRAM_DISCO_F469NI 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;
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Mar 18 09:43:21 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/c0f6e94411f5 \ No newline at end of file