Diff: main.cpp

Revision:

0:86e09ad03619

diff -r 000000000000 -r 86e09ad03619 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Dec 22 08:01:53 2016 +0000
@@ -0,0 +1,50 @@
+//BAUMER GXMMW Absolute Multiturn encoder example code
+//Steps per turn ≤8192 / 13 bit
+//Number of turns ≤65536 / 16 bit
+
+//Reading BAUMER GXMMW encoder data bypasing CANopen interface
+//Reading 29bit (multiturn) position from Absolute encoder via SSI
+//Displaying encoder positon on i2c OLED 32x128 display
+
+#include "mbed.h"
+#include "Adafruit_SSD1306.h"
+
+DigitalOut myled(LED1);
+
+SPI spi(p5, p6, p7); //I'm using only pin p6 & p7 for encoder->mbed connection
+
+I2C myI2C(p9,p10);  //OLED screen
+Adafruit_SSD1306_I2c oled(myI2C,p13,0x78,32,128);
+ 
+int main(){
+    spi.format(10,2);
+    spi.frequency(500000);
+    
+    Serial pc(USBTX, USBRX);
+    
+    uint32_t data[3] = {0, 0, 0};
+    uint32_t encoder_value = 0;
+    
+    while(1)
+    {   
+        //clocking out 30bit of data from encoder
+        data[0] = spi.write(0xFF);
+        data[1] = spi.write(0xFF);
+        data[2] = spi.write(0xFF);
+
+        data[0] <<= 20;
+        data[1] <<= 10;
+    
+        encoder_value = data[2] | data[1] | data[0];
+        
+        encoder_value &= 0x1FFFFFFF; // masking first bit (30bit->29bit)
+        
+        //displaying encoder data on serial monitor
+        //pc.printf("%d\n",encoder_value);
+    
+        oled.printf("%09u\r",encoder_value);
+        oled.display();
+        
+        wait_us(50);
+    }
+}
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