Diff: main.cpp

Revision:

0:a4e0322eee67

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Nov 14 14:28:12 2018 +0000
@@ -0,0 +1,58 @@
+#include "mbed.h"
+
+SPI spi(PA_7, PA_6, PA_5);      // Ordered as: mosi, miso, sclk could use forth parameter ssel
+DigitalOut cs(PC_6);            // Chip Select for Basic Outputs to illuminate Onboard FPGA DEO nano LEDs CN7 pin 1
+
+int32_t read_switches(void);    //Read 4 Sliding switches on FPGA (Simulating OPTO-Switches from Motor(s)
+
+//NBB the following line for F429ZI !!!!
+DigitalIn DO_NOT_USE(PB_12);    // MAKE PB_12 (D19) an INPUT do NOT make an OUTPUT under any circumstances !!!!! ************* !!!!!!!!!!!
+                                // This Pin is connected to the 5VDC from the FPGA card and an INPUT is 5V Tolerant
+
+//Ticker ticktock;
+  
+int main() {
+    cs = 1;                     // Chip must be deselected, Chip Select is active LOW
+    spi.format(8,0);            // Setup the DATA frame SPI for 16 bit wide word, Clock Polarity 0 and Clock Phase 0 (0)
+    spi.frequency(1000000);     // 1MHz clock rate
+
+        printf("TEST\n\r");
+    while(true)                 //Loop forever Knight Rider Display on FPGA
+    {
+        read_switches();
+            
+        //LED Chaser display KIT lives on!
+        for (uint32_t i=1;i<=128;i*=2)
+        {
+            cs = 0;             //Select the device by seting chip select LOW
+            spi.write(0);               //Send the command
+                        spi.write(i);               //Send the data - ignore the return data
+            cs = 1;             //De-Select the device by seting chip select HIGH
+            wait_ms(20);
+        }
+        for (uint32_t i=128;i>=1;i/=2)
+        {
+            cs = 0;             //Select the device by seting chip select LOW
+            spi.write(0);               //Send the command
+                        spi.write(i);               //Send the data - ignore the return data
+            cs = 1;             //De-Select the device by seting chip select HIGH
+            wait_ms(20);
+        }
+                wait_ms(1000);
+    }
+}
+
+//Function to read back the state of the switches
+int read_switches(void){
+    int sw_val = 0;
+    cs = 0;             //Select the device by seting chip select LOW
+    spi.write(0);   //Command
+    sw_val = spi.write(0x01) & 0x0F; // Just want to read back lower 4bit nibble
+    cs = 1 ;            //De-select the device by seting chip select HIGH
+    if (sw_val&(1<<0)){ printf("Switch 0 :"); }
+    if (sw_val&(1<<1)){ printf("Switch 1 :"); }
+    if (sw_val&(1<<2)){ printf("Switch 2 :"); }
+    if (sw_val&(1<<3)){ printf("Switch 3 :"); }
+    if (sw_val>0)     { printf("\r\n");       }
+    return sw_val;    
+}