Diff: main.cpp

Revision:

0:6be425a138b2

Child:

1:37f364164ca9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Apr 10 19:02:41 2016 +0000
@@ -0,0 +1,104 @@
+/* 06_spi_max7219_led8x8
+ *
+ * Simple demo to drive a 8x8-as LED matrix by a MAX7219 LED driver IC
+ * After initialisation two characters (H and W) are displayed alternatively.
+ * The MAX7219 IC is driven by hardware SPI: SPI0 module at PTD1, PTD2, PTD3.
+ */
+ 
+#include "mbed.h"
+#include "MMA8451Q.h"
+
+PinName const SDA = PTE25;
+PinName const SCL = PTE24;
+ 
+SPI spi(PTD2, PTD3, PTD1);          // Arduino compatible MOSI, MISO, SCLK
+DigitalOut cs(PTD0);                // Chip select
+
+#define MMA8451_I2C_ADDRESS (0x1d<<1)
+ 
+const unsigned char led1[]= {
+    0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0xFF
+};  //H
+const unsigned char led2[]= {
+    0x1F,0x60,0x80,0x40,0x40,0x80,0x60,0x1F
+};  //W
+ 
+/// Send two bytes to SPI bus
+void SPI_Write2(unsigned char MSB, unsigned char LSB)
+{
+    cs = 0;                         // Set CS Low
+    spi.write(MSB);                 // Send two bytes
+    spi.write(LSB);
+    cs = 1;                         // Set CS High
+}
+
+void direction(float x, float y){
+    if(x > 0.5){
+        printf("Left \n");
+    }else if(x < -0.5){
+        printf("Right \n");
+    }else if(y > 0.5){
+        printf("Up \n");
+    }else if(y < -0.5){
+        printf("Down \n");
+    }else{
+        printf("Neutral Position \n");    
+      }
+}
+ 
+/// MAX7219 initialisation
+void Init_MAX7219(void)
+{
+    SPI_Write2(0x09, 0x00);         // Decoding off
+    SPI_Write2(0x0A, 0x08);         // Brightness to intermediate
+    SPI_Write2(0x0B, 0x07);         // Scan limit = 7
+    SPI_Write2(0x0C, 0x01);         // Normal operation mode
+    SPI_Write2(0x0F, 0x0F);         // Enable display test
+    wait_ms(500);                   // 500 ms delay
+    SPI_Write2(0x01, 0x00);         // Clear row 0.
+    SPI_Write2(0x02, 0x00);         // Clear row 1.
+    SPI_Write2(0x03, 0x00);         // Clear row 2.
+    SPI_Write2(0x04, 0x00);         // Clear row 3.
+    SPI_Write2(0x05, 0x00);         // Clear row 4.
+    SPI_Write2(0x06, 0x00);         // Clear row 5.
+    SPI_Write2(0x07, 0x00);         // Clear row 6.
+    SPI_Write2(0x08, 0x00);         // Clear row 7.
+    SPI_Write2(0x0F, 0x00);         // Disable display test
+    wait_ms(500);                   // 500 ms delay
+}
+ 
+int main()
+{
+    
+    cs = 1;                         // CS initially High
+    spi.format(8,0);                // 8-bit format, mode 0,0
+    spi.frequency(1000000);         // SCLK = 1 MHz
+    Init_MAX7219();                 // Initialize the LED controller
+    MMA8451Q acc(SDA, SCL, MMA8451_I2C_ADDRESS);
+    PwmOut rled(LED1);
+    PwmOut gled(LED2);
+    PwmOut bled(LED3);
+    
+    
+    while (1) {
+        
+        float x, y, z;
+        x = acc.getAccX();
+        y = acc.getAccY();
+        z = acc.getAccZ();
+        rled = 1.0f - abs(x);
+        gled = 1.0f - abs(y);
+        bled = 1.0f - abs(z);
+        direction(x,y);
+        wait(0.5f);
+        
+        for(int i=1; i<9; i++)      // Write first character (8 rows)
+            SPI_Write2(i,led1[i-1]);
+        wait(1);                    // 1 sec delay
+        for(int i=1; i<9; i++)      // Write second character
+            SPI_Write2(i,led2[i-1]);
+        wait(1);                    // 1 sec delay */
+    }
+    
+    
+}
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