Diff: main.cpp

Revision:

0:0b48f20e6d6e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Sep 12 05:12:02 2014 +0000
@@ -0,0 +1,97 @@
+#include "mbed.h"
+#include "USBSerial.h"
+#include "SDFileSystem.h"
+
+#define     CW      0x01
+#define     CCW     0x02
+#define     STOP    0x03
+#define     FREE    0x00
+
+DigitalOut  led(P1_28);
+DigitalOut  cs0(P0_20);
+
+DigitalIn   sw(P0_1);
+
+PwmOut      pwm(P1_26);
+
+USBSerial   vcom;
+
+Timer t;
+
+SPI         spi(P1_22, NC, P1_15);
+BusOut      mdrive0(P1_19, P1_25);
+
+SDFileSystem sd(P0_9, P0_8, P1_29, P1_31, "sd");
+
+union MCP4922
+{
+    uint16_t command;
+    struct
+    {
+        //DAC data bits
+        uint16_t    D   :12;
+        //Output power down control bit
+        uint8_t     SHDN:1;
+        //Outout gain select bit
+        uint8_t     GA  :1;
+        //Vref input buffer Control bit
+        uint8_t     BUF :1;
+        //DACa or DACb select bit
+        uint8_t     AB  :1;
+    }bit;
+};
+union MCP4922 dac = {0xF7F};
+
+void systeminit();
+
+int main(){
+    uint16_t velocity = 0;
+    char str[64];
+    systeminit();
+    mdrive0 = CW;
+    pwm = 0.2;
+    while(1){
+        led = !led;
+        velocity += 100;
+        if(velocity > 4095) velocity = 0;
+        dac.bit.D = velocity;
+        cs0 = 0;
+        spi.write(dac.command);
+        cs0 = 1;
+        if(sw == 0){
+            mkdir("/sd/mydir", 0777);
+            
+            FILE *fp = fopen("/sd/mydir/sdtest.txt", "w");
+            if(fp == NULL)
+            {
+                vcom.printf("Could not open file for write\n");
+                break;
+            }
+            t.start();
+            fprintf(fp, "Hello fun SD");
+            t.stop();
+            fclose(fp);
+            vcom.printf("The time taken was %d micro seconds\n", t.read_us());
+            vcom.printf("goodbye\n");
+            
+            while(sw == 0){}
+        }
+        wait(0.1);
+    }
+}
+
+void systeminit(){
+    sw.mode(PullUp);
+    wait(0.1);
+    cs0 = 1;
+    dac.bit.AB = 0;
+    dac.bit.BUF = 1;
+    dac.bit.GA = 1;
+    dac.bit.SHDN = 1;
+    dac.bit.D = 1024;
+    spi.format(16,0);
+    spi.frequency(20000000);
+    cs0 = 0;
+    spi.write(dac.command);
+    cs0 = 1;
+}
\ No newline at end of file