Diff: main.cpp

Revision:

1:e4104703c457

Parent:

0:7953b8ea1d53

--- a/main.cpp	Sun Jan 15 15:11:31 2012 +0000
+++ b/main.cpp	Tue Jan 17 18:48:29 2012 +0000
@@ -4,9 +4,13 @@
 Serial pc(USBTX,USBRX);
 
 #define TNF 0x02
-#define TNE 0x01
+#define TFE 0x01
 #define RNE 0x04
 
+#define WREN 0x06
+#define WRITE 0x02
+#define READ 0x03
+
 /*** My method to write to FeRAM ***/
 void spi_write (unsigned char data) {
     // First don't write to the FIFO buffer if it is full
@@ -17,20 +21,23 @@
 
 /*** Write a byte to FeRAM ***/
 void write_byte (int address, unsigned char data) {
-    spi_write(0x02);                    // Send write command
+    spi_write(WREN);
+    while (!(LPC_SSP1->SR & TFE))       // While TFE-Bit = 1 (FIFO empty)...
+        ;                               // Wait
+    spi_write(WRITE);                   // Send write command
     spi_write(address >> 16);           // Send top address byte to write to
     spi_write((address >> 8) & 0xFF);   // Send Middle address byte to write to
     spi_write(address & 0xFF);          // Send Bottom address byte to write to
     spi_write(data);                    // Send data to be write
     // Now I need to check that the FIFO transmit buffer is empty exiting the method
-    while (!(LPC_SSP1->SR & TNE))       // While TNE-Bit = 0 (FIFO not empty)...
+    while (!(LPC_SSP1->SR & TFE))       // While TFE-Bit = 0 (FIFO not empty)...
         ;                               // Wait
 }
 
 /*** Read a byte from FeRAM ***/
 unsigned char read_byte (int address) {
-    unsigned char my_val = 0;           // Variable to store the read data
-    spi_write(0x03);                    // Send read command
+    unsigned char my_val;               // Variable to store the read data
+    spi_write(READ);                    // Send read command
     spi_write(address >> 16);           // Send top address byte to read from
     spi_write((address >> 8) & 0xFF);   // Send Middle address byte to read from
     spi_write(address & 0xFF);          // Send Bottom address byte to read from
@@ -38,29 +45,45 @@
     spi_write(0x00);                    // Send the dummy byte
     // Now I need to empty the FIFO receive buffer...
     while (LPC_SSP1->SR & RNE)          // While RNE-Bit = 1 (FIFO receive buffer not empty)...
-        my_val = LPC_SSP1->DR;          // Read the byte in the buffer 
+        my_val = LPC_SSP1->DR;          // Read the byte in the buffer
     return (my_val);                    // Return the last byte read
 }
 
 int main() {
+    unsigned char my_val[19200];
 
     // Set up the SPI port...
     my_spi.frequency(32000000);         // 32MHz is the fastest mbed frequency supported by the FeRAM
     my_spi.format(8,3);                 // Set for mode 3
     LPC_PINCON->PINSEL0 |= 0x00002000;  // Set up SSEL1
+
+    // To start with I need the chip select high and wait 1ms after powering up
     wait(0.001);                        // Must wait 1ms after power on before using FeRAM
-    my_spi.write(0x06);                 // Send WREN command to write enable
+
+    // Create timers
+    Timer write_timer, read_timer;
 
-    // Thought I would wait a bit to get a cleaner scope trace
-    wait_us(2);
+    int val = 88;
+    
+    write_timer.start();
+    // Write the bytes...
+    for (int i = 0; i < 19200; i++) {
+        write_byte (i, val);
+    }
+    write_timer.stop();
 
-    // Write the byte...
-    write_byte (100, 0x4C);
- 
-    // Thought I would wait a bit again
-    wait_us(2);
+    read_timer.start();
+    // Read the bytes...
+    for (int i = 0; i < 19200; i++) {
+        my_val[i] = read_byte (i);
+    }
+    read_timer.stop();
 
-    // read the byte and display on TeraTerm  
-    int my_val = read_byte (100);
-    pc.printf(" Value = 0x%X",my_val);
+    // Print the data read on screen
+    for (int i = 0; i < 19200; i++) {
+        if(my_val[i] != val)
+            pc.printf("\n\r Error at element %d [%d]",i,my_val[i]);
+    }
+    
+    pc.printf("\n\n\r Write Time = %f ms\n\r Read Time = %f ms",write_timer.read()*1000,read_timer.read()*1000);
 }
\ No newline at end of file