Revision 2:0278916c21f7, committed 2016-08-31

Comitter:

irsanjul

Date:

Wed Aug 31 03:02:06 2016 +0000

Parent:

1:0bdf3bebb1d7

Commit message:

from https://developer.mbed.org/cookbook/Serial-Interrupts

Changed in this revision

diff -r 0bdf3bebb1d7 -r 0278916c21f7 main.cpp
--- a/main.cpp	Sun Dec 09 14:30:36 2012 +0000
+++ b/main.cpp	Wed Aug 31 03:02:06 2016 +0000
@@ -1,4 +1,3 @@
-
 #include "mbed.h"
 // Serial TX & RX interrupt loopback test using formatted IO - sprintf and sscanf
 // Connect TX to RX (p9 to p10)
@@ -8,10 +7,19 @@
 // LED1 and LED2 indicate RX and TX interrupt routine activity
 // LED3 changing indicate main loop running
 
+/*
+    Pin     |   Connection  |   IRQn
+    USBTX       TxD0            UART0_IRQn
+    USBRX       RxD0
+    p9          TxD3            UART3_IRQn
+    p10         RxD3    
+    p13         TxD1            UART1_IRQn
+    p14         RxD1    
+    p28         TxD2            UART2_IRQn
+    p27         RxD2    
+*/
 
-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);
+Serial device(USBTX, USBRX);  // tx, rx
 DigitalOut led1(LED1);
 DigitalOut led2(LED2);
 DigitalOut led3(LED3);
@@ -41,7 +49,6 @@
 
 // main test program
 int main() {
-    int i=0;
     int rx_i=0;
     device.baud(9600);
 
@@ -52,42 +59,13 @@
 
 // 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;
-        }
+    while (1)
+    {
+        read_line();
+        sscanf(rx_line,"%x",&rx_i);
+        
+        sprintf(tx_line,"%x\r\n",rx_i);
+        send_line();
     }
 }
 
@@ -97,18 +75,23 @@
     char temp_char;
     bool empty;
     i = 0;
+    
 // Start Critical Section - don't interrupt while changing global buffer variables
-    NVIC_DisableIRQ(UART1_IRQn);
+    NVIC_DisableIRQ(UART0_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);
+            NVIC_EnableIRQ(UART0_IRQn);
+            
             while (((tx_in + 1) % buffer_size) == tx_out) {
             }
+
 // Start Critical Section - don't interrupt while changing global buffer variables
-            NVIC_DisableIRQ(UART1_IRQn);
+            NVIC_DisableIRQ(UART0_IRQn);
         }
         tx_buffer[tx_in] = tx_line[i];
         i++;
@@ -120,8 +103,9 @@
 // Send first character to start tx interrupts, if stopped
         device.putc(temp_char);
     }
+    
 // End Critical Section
-    NVIC_EnableIRQ(UART1_IRQn);
+    NVIC_EnableIRQ(UART0_IRQn);
     return;
 }
 
@@ -129,26 +113,33 @@
 void read_line() {
     int i;
     i = 0;
+    
 // Start Critical Section - don't interrupt while changing global buffer variables
-    NVIC_DisableIRQ(UART1_IRQn);
+    NVIC_DisableIRQ(UART0_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);
+            NVIC_EnableIRQ(UART0_IRQn);
+
             while (rx_in == rx_out) {
             }
+
 // Start Critical Section - don't interrupt while changing global buffer variables
-            NVIC_DisableIRQ(UART1_IRQn);
+            NVIC_DisableIRQ(UART0_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);
+    NVIC_EnableIRQ(UART0_IRQn);
     return;
 }
 

diff -r 0bdf3bebb1d7 -r 0278916c21f7 mbed.bld
--- a/mbed.bld	Sun Dec 09 14:30:36 2012 +0000
+++ b/mbed.bld	Wed Aug 31 03:02:06 2016 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/63cdd78b2dc1
\ No newline at end of file
+http://mbed.org/users/mbed_official/code/mbed/builds/2241e3a39974
\ No newline at end of file