Diff: main.cpp

Revision:

0:c09069b2addc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Jan 29 05:30:52 2015 +0000
@@ -0,0 +1,202 @@
+// Allen Wild
+// ECE 4180, Spring 2015
+// Lab 1 solution
+
+#include "mbed.h"
+
+//#define PART1
+//#define PART2
+//#define PART3
+//#define EXCRED1
+//#define EXCRED2 // not implemented here
+//#define EXCRED3
+//#define EXCRED4 // not implemented here
+#define EXCRED5
+
+DigitalIn  button1(p21);
+DigitalIn  button2(p24);
+
+#ifdef PART1 //{{{
+DigitalOut led(p26);
+
+int main()
+{
+    while(1)
+    {
+        led = !button2;
+        wait_ms(50);
+    }
+}
+#endif //}}}
+
+#ifdef PART2 //{{{
+PwmOut led(p26);
+
+int main()
+{
+    float val = 0.5;
+
+    while (1)
+    {
+        if (button1)
+        {
+            val += 0.01;
+            if (val > 1)
+                val = 1;
+        }
+        if (button2)
+        {
+            val -= 0.01;
+            if (val < 0)
+                val = 0;
+        }
+        led = val;
+        wait_ms(20);
+    }
+}
+#endif //}}}
+
+#ifdef PART3 //{{{
+#include "MCP23S17.h"
+SPI spi(p11, p12, p13);
+MCP23S17 chip(spi, p14, 0x40);
+
+int main()
+{
+    chip.direction(PORT_A, 0xFF); // input
+    chip.direction(PORT_B, 0x00); // output
+    chip.configurePullUps(PORT_A, 0x01);
+
+    while (1)
+    {
+        char port_val = chip.read(PORT_A);
+        chip.write(PORT_B, ~port_val & 0x01);
+        wait_ms(50);
+    }
+}
+#endif //}}}
+
+#ifdef EXCRED1 //{{{
+// Watchdog Timer
+
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led(p26);
+
+void wdt_kick()
+{
+    LPC_WDT->WDFEED = 0xAA;
+    LPC_WDT->WDFEED = 0x55;
+}
+
+void wdt_setup(float s)
+{
+    // from cookbook page
+    LPC_WDT->WDCLKSEL = 0x1;
+    uint32_t clk = SystemCoreClock / 16;
+    LPC_WDT->WDTC = s * (float)clk;
+    LPC_WDT->WDMOD = 0x3;
+    wdt_kick();
+}
+
+int main()
+{
+    led1 = 0;
+    if ((LPC_WDT->WDMOD >> 2) & 1)
+        led2 = 1;
+    else
+        led2 = 0;
+
+    wdt_setup(3.0);
+    
+    while (1)
+    {
+        led = !button2;
+        wait_ms(50);
+        if (!button1)
+        {
+            led1 = 1;
+            while (1); // get stuck if button1 pressed
+        }
+        wdt_kick();
+    }
+}
+#endif //}}}
+
+#ifdef EXCRED3 //{{{
+
+SPI spi(p5, p6, p7);
+DigitalOut latch(p9);
+DigitalOut nenable(p8);
+
+void shiftbrite_write(int color)
+{
+    int red = (color >> 16) & 0xFF;
+    int green = (color >> 8) & 0xFF;
+    int blue = color & 0xFF;
+    int command = (blue << 20) | (red << 10) | green;
+    spi.write(command >> 16);
+    spi.write(command & 0x0000ffff);
+    latch = 1;
+    wait(0.00001);
+    latch = 0;
+}
+
+#define N_COLORS 6
+const int colors[N_COLORS] = {0xff0000, 0xffff00, 0x00ff00, 0x00ffff, 0x0000ff, 0xff00ff};
+
+int main()
+{
+    // set up ShiftBrite
+    spi.format(16, 0);
+    spi.frequency(500000);
+    latch = 0;
+    nenable = 0;
+    shiftbrite_write(colors[0]);
+
+    int i = 1;
+    while (1)
+    {
+        if (!button2) // change color when button pressed
+        {
+            shiftbrite_write(colors[i]);
+            if (++i >= N_COLORS)
+                i = 0;
+            while (!button2); // wait until button releases
+        }
+        if (!button1)
+        {
+            nenable = !nenable; // toggle enable pin
+            while (!button1);
+        }
+        wait_ms(50);
+    }
+}
+
+#endif //}}}
+
+#ifdef EXCRED5 //{{{
+#include "MCP23S17.h"
+
+SPI spi(p11, p12, p13);
+MCP23S17 chip1(spi, p14, 0x40);
+MCP23S17 chip2(spi, p14, 0x42);
+
+int main()
+{
+    chip1.direction(PORT_A, 0xFF); // input
+    chip1.direction(PORT_B, 0x00); // output
+    chip1.configurePullUps(PORT_A, 0x01);
+    chip2.direction(PORT_A, 0xFF);
+    chip2.direction(PORT_B, 0x00);
+
+    while (1)
+    {
+        char port_val = chip1.read(PORT_A);
+        chip1.write(PORT_B, ~port_val & 0x01);
+        chip2.write(PORT_B, ~port_val & 0x01);
+        wait_ms(50);
+    }
+}
+
+#endif //}}}