Diff: main.cpp

Revision:

0:9f7dc2fe8bbb

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Nov 17 19:32:50 2014 +0000
@@ -0,0 +1,69 @@
+#include "mbed.h"
+#include <string.h>
+#include <stdlib.h>
+
+/* Commands:
+    Dd      - Data out (2 bytes long)
+    Cx      - CS line state (0/1)
+    R      - Receive data
+*/
+
+DigitalOut myled(LED1); //blinks when talking (via TeraTerm) through SPI
+SPI spi_device(p5, p6, p7); //p5=mosi, p6=miso, p7=sclock
+DigitalOut spi_cs(p8); //Cs line, 0 = on, 1 = off
+AnalogIn voltage(p20); //voltage being read
+
+Serial tty_usb(USBTX, USBRX); //generates serial communication through USB
+char tty_buffer[0x100]; //?
+
+void receive_command() {//waits to receive commands
+    uint8_t buffer_ptr = 0;
+    char ch;
+
+    tty_usb.putc('>');//puts > on input line
+    while (1) {//waits for input
+
+        if (tty_usb.readable()) {
+            ch = tty_usb.getc();
+            tty_usb.putc(ch);
+            tty_buffer[buffer_ptr] = ch;
+            buffer_ptr++;
+            if ((ch == '\n') || (ch == '\r')) {
+                tty_usb.putc('\n');
+                tty_usb.putc('\r');
+                break;
+            }
+            if (ch == 0x7f) {
+                buffer_ptr -= 2;
+                tty_usb.putc(0x8);
+                tty_usb.putc(' ');
+                tty_usb.putc(0x8);
+            }
+        }
+    }
+}
+int main() {
+    uint16_t arg_data, arg_data_in;
+    float placeholder = voltage.read()*10/3;
+    tty_usb.baud(9600);
+    while(1) {        
+        receive_command();
+        switch (tty_buffer[0]) {
+            case 'D':
+            case 'd':
+                arg_data = strtol(&tty_buffer[1], NULL, 16);
+                arg_data_in = spi_device.write(arg_data);
+                tty_usb.printf("#\tSingle data: OUT: $%04X -  IN: $%02X\n\r", arg_data, arg_data_in);
+                break;
+            case 'C':
+            case 'c':
+                spi_cs = (tty_buffer[1] == '0') ? 0 : 1;
+                break;
+            case 'R':
+            case 'r':
+                tty_usb.printf("The old voltage was: %.02f\r\nThe voltage being read in now is: %.02f\r\n",placeholder,voltage.read()*10/3);
+                placeholder=voltage.read()*10/3;
+                break;               
+        }
+    }
+}