Tom Soulanille / RTOS-Serial

An RTOS-friendly Serial interface Its primary benefit is that it never hogs the CPU. An amusing alternative to the traditional ring-bufferd interrupt-serviced systems, it uses short mbed-rtos queues to buffer characters to and from the UART, and a thread to service the transmitter. Short interrupt service routines enqueue received characters and signal the transmit thread when the transmitter is available. WARNING: Do not create RTOS-Serial objects before the RTOS is running! Put them inside your main() block or another function, not in the global initialization.

Dependents:   Test_RDM880_rfid_reader

Diff: rtos_serial.cpp

Revision:
1:5a66fddad7c4
Parent:
0:0547c8bf304f
Child:
2:891773cc33fd
--- a/rtos_serial.cpp	Fri Oct 18 02:55:07 2013 +0000
+++ b/rtos_serial.cpp	Fri Oct 18 03:39:24 2013 +0000
@@ -30,11 +30,11 @@
     const PinName leds[] = {LED1,LED2,LED3,LED4};
     ledp = new DigitalOut(leds[get_index()]);
     tx_emitter_threadp = new Thread(tx_emitter, (void *) this);
-};
+    tx_tp[get_index()] = tx_emitter_threadp;
+    attach(tx_isr[get_index()], Serial::TxIrq);
+}
 
-Thread* RTOS_Serial::tx_tp[4] = { NULL, NULL, NULL, NULL };
-
-serial_t RTOS_Serial::get_serial() { return _serial; };
+serial_t RTOS_Serial::get_serial() { return _serial; }
 
 int  RTOS_Serial::get_index() { return _serial.index; }
 
@@ -58,6 +58,33 @@
     //tx_emitter_threadp->signal_set(0x1);
     tx_tp[0]->signal_set(0x01);
 }
+// class method
+void RTOS_Serial::UART1_TX_ISR(){
+    uint32_t IRR = LPC_UART1->IIR;
+    //tx_emitter_threadp->signal_set(0x1);
+    tx_tp[1]->signal_set(0x01);
+}
+// class method
+void RTOS_Serial::UART2_TX_ISR(){
+    uint32_t IRR = LPC_UART2->IIR;
+    //tx_emitter_threadp->signal_set(0x1);
+    tx_tp[2]->signal_set(0x01);
+}
+// class method
+void RTOS_Serial::UART3_TX_ISR(){
+    uint32_t IRR = LPC_UART3->IIR;
+    //tx_emitter_threadp->signal_set(0x1);
+    tx_tp[3]->signal_set(0x01);
+}
+
+func RTOS_Serial::tx_isr[4] = {
+    &RTOS_Serial::UART0_TX_ISR, 
+    &RTOS_Serial::UART1_TX_ISR, 
+    &RTOS_Serial::UART2_TX_ISR, 
+    &RTOS_Serial::UART3_TX_ISR, 
+};
+
+Thread* RTOS_Serial::tx_tp[4] = { NULL, NULL, NULL, NULL };
 
 // tx_emitter is a class method
 void RTOS_Serial::tx_emitter(void const *argument){
@@ -73,7 +100,7 @@
 #if 1
         evt = sp->tx_q.get();
         if (evt.status == osEventMessage) {
-            //Thread::signal_wait(0x1);
+            Thread::signal_wait(0x1);
             *(sp->ledp) = 1;
             sp->parent_putc(evt.value.v);
             *(sp->ledp) = 0;