Diff: main.cpp

Revision:

2:f026b40fadb1

Parent:

0:023c5cda6102

--- a/main.cpp	Sun Dec 09 14:30:36 2012 +0000
+++ b/main.cpp	Thu Nov 15 17:10:45 2018 +0000
@@ -1,181 +1,33 @@
+#include "mbed.h"
 
-#include "mbed.h"
-// Serial TX & RX interrupt loopback test using formatted IO - sprintf and sscanf
-// Connect TX to RX (p9 to p10)
-// or can also use USB and type back in the number printed out in a terminal window
-// Sends out ASCII numbers in a loop and reads them back
-// If not the same number LED4 goes on
-// LED1 and LED2 indicate RX and TX interrupt routine activity
-// LED3 changing indicate main loop running
-
-
-Serial device(p9, p10);  // tx, rx
-// Can also use USB and type back in the number printed out in a terminal window
-// Serial monitor_device(USBTX, USBRX);
 DigitalOut led1(LED1);
 DigitalOut led2(LED2);
-DigitalOut led3(LED3);
-DigitalOut led4(LED4);
 
-
-void Tx_interrupt();
-void Rx_interrupt();
-void send_line();
-void read_line();
-
+Serial pc(USBTX, USBRX);
 
-// Circular buffers for serial TX and RX data - used by interrupt routines
-const int buffer_size = 255;
-// might need to increase buffer size for high baud rates
-char tx_buffer[buffer_size];
-char rx_buffer[buffer_size];
-// Circular buffer pointers
-// volatile makes read-modify-write atomic
-volatile int tx_in=0;
-volatile int tx_out=0;
-volatile int rx_in=0;
-volatile int rx_out=0;
-// Line buffers for sprintf and sscanf
-char tx_line[80];
-char rx_line[80];
-
-// main test program
-int main() {
-    int i=0;
-    int rx_i=0;
-    device.baud(9600);
-
-// Setup a serial interrupt function to receive data
-    device.attach(&Rx_interrupt, Serial::RxIrq);
-// Setup a serial interrupt function to transmit data
-    device.attach(&Tx_interrupt, Serial::TxIrq);
+bool flag = false;
+char rec;
 
-// Formatted IO test using send and receive serial interrupts
-// with sprintf and sscanf
-    while (1) {
-// Loop to generate different test values - send value in hex, decimal, and octal and  then read back
-        for (i=0; i<0xFFFF; i++) {
-            led3=1;
-// Print ASCII number to tx line buffer in hex
-            sprintf(tx_line,"%x\r\n",i);
-// Copy tx line buffer to large tx buffer for tx interrupt routine
-            send_line();
-// Print ASCII number to tx line buffer in decimal
-            sprintf(tx_line,"%d\r\n",i);
-// Copy tx line buffer to large tx buffer for tx interrupt routine
-            send_line();
-// Print ASCII number to tx line buffer in octal
-            sprintf(tx_line,"%o\r\n",i);
-// Copy tx line buffer to large tx buffer for tx interrupt routine
-            send_line();
-            led3=0;
-// Read a line from the large rx buffer from rx interrupt routine
-            read_line();
-// Read ASCII number from rx line buffer
-            sscanf(rx_line,"%x",&rx_i);
-// Check that numbers are the same
-            if (i != rx_i) led4=1;
-// Read a line from the large rx buffer from rx interrupt routine
-            read_line();
-// Read ASCII number from rx line buffer
-            sscanf(rx_line,"%d",&rx_i);
-// Check that numbers are the same
-            if (i != rx_i) led4=1;
-// Read a line from the large rx buffer from rx interrupt routine
-            read_line();
-// Read ASCII number from rx line buffer
-            sscanf(rx_line,"%o",&rx_i);
-// Check that numbers are the same
-            if (i != rx_i) led4=1;
+void callback_ex() {
+    // Note: you need to actually read from the serial to clear the RX interrupt
+    //pc.putc(pc.getc());
+    while(pc.readable()) {
+        rec = pc.getc();
         }
-    }
+    flag = true;
+    led2 = !led2;
 }
 
-// Copy tx line buffer to large tx buffer for tx interrupt routine
-void send_line() {
-    int i;
-    char temp_char;
-    bool empty;
-    i = 0;
-// Start Critical Section - don't interrupt while changing global buffer variables
-    NVIC_DisableIRQ(UART1_IRQn);
-    empty = (tx_in == tx_out);
-    while ((i==0) || (tx_line[i-1] != '\n')) {
-// Wait if buffer full
-        if (((tx_in + 1) % buffer_size) == tx_out) {
-// End Critical Section - need to let interrupt routine empty buffer by sending
-            NVIC_EnableIRQ(UART1_IRQn);
-            while (((tx_in + 1) % buffer_size) == tx_out) {
-            }
-// Start Critical Section - don't interrupt while changing global buffer variables
-            NVIC_DisableIRQ(UART1_IRQn);
-        }
-        tx_buffer[tx_in] = tx_line[i];
-        i++;
-        tx_in = (tx_in + 1) % buffer_size;
+int main() {
+    pc.attach(&callback_ex);
+    
+    while (1) {
+        led1 = !led1;
+//        wait(0.5);
+        if(flag) {
+            pc.putc(rec);
+            flag = false;
+//         led1 = !led1;
+           }
     }
-    if (device.writeable() && (empty)) {
-        temp_char = tx_buffer[tx_out];
-        tx_out = (tx_out + 1) % buffer_size;
-// Send first character to start tx interrupts, if stopped
-        device.putc(temp_char);
-    }
-// End Critical Section
-    NVIC_EnableIRQ(UART1_IRQn);
-    return;
 }
-
-// Read a line from the large rx buffer from rx interrupt routine
-void read_line() {
-    int i;
-    i = 0;
-// Start Critical Section - don't interrupt while changing global buffer variables
-    NVIC_DisableIRQ(UART1_IRQn);
-// Loop reading rx buffer characters until end of line character
-    while ((i==0) || (rx_line[i-1] != '\r')) {
-// Wait if buffer empty
-        if (rx_in == rx_out) {
-// End Critical Section - need to allow rx interrupt to get new characters for buffer
-            NVIC_EnableIRQ(UART1_IRQn);
-            while (rx_in == rx_out) {
-            }
-// Start Critical Section - don't interrupt while changing global buffer variables
-            NVIC_DisableIRQ(UART1_IRQn);
-        }
-        rx_line[i] = rx_buffer[rx_out];
-        i++;
-        rx_out = (rx_out + 1) % buffer_size;
-    }
-    rx_line[i-1] = 0;
-// End Critical Section
-    NVIC_EnableIRQ(UART1_IRQn);
-    return;
-}
-
-// Interupt Routine to read in data from serial port
-void Rx_interrupt() {
-    led1=1;
-// Loop just in case more than one character is in UART's receive FIFO buffer
-// Stop if buffer full
-    while ((device.readable()) || (((rx_in + 1) % buffer_size) == rx_out)) {
-        rx_buffer[rx_in] = device.getc();
-// Uncomment to Echo to USB serial to watch data flow
-//        monitor_device.putc(rx_buffer[rx_in]);
-        rx_in = (rx_in + 1) % buffer_size;
-    }
-    led1=0;
-    return;
-}
-
-// Interupt Routine to write out data to serial port
-void Tx_interrupt() {
-    led2=1;
-// Loop to fill more than one character in UART's transmit FIFO buffer
-// Stop if buffer empty
-    while ((device.writeable()) && (tx_in != tx_out)) {
-        device.putc(tx_buffer[tx_out]);
-        tx_out = (tx_out + 1) % buffer_size;
-    }
-    led2=0;
-    return;
-}
\ No newline at end of file