1 files changed, 126 insertions, 0 deletions
diff --git a/VexRiscv/src/test/cpp/common/uart.h b/VexRiscv/src/test/cpp/common/uart.h
new file mode 100644
index 0000000..05021ca
--- /dev/null
+++ b/VexRiscv/src/test/cpp/common/uart.h
@@ -0,0 +1,126 @@
+
+
+
+class UartRx : public TimeProcess{
+public:
+
+	CData *rx;
+	uint32_t uartTimeRate;
+	UartRx(CData *rx, uint32_t uartTimeRate){
+		this->rx = rx;
+		this->uartTimeRate = uartTimeRate;
+		schedule(uartTimeRate);
+	}
+
+	enum State {START, DATA, STOP};
+	State state = START;
+	char data;
+	uint32_t counter;
+
+
+	virtual void tick(){
+		switch(state){
+			case START:
+				if(*rx == 0){
+					state = DATA;
+					counter = 0;
+					data = 0;
+					schedule(uartTimeRate*5/4);
+				} else {
+					schedule(uartTimeRate/4);
+				}
+			break;
+			case DATA:
+				data |= (*rx) << counter++;
+				if(counter == 8){
+					state = STOP;
+				}
+				schedule(uartTimeRate);
+			break;
+			case STOP:
+				if(*rx){
+					cout << data << flush;
+				} else {
+					cout << "UART RX FRAME ERROR at " << time << endl;
+				}
+
+				schedule(uartTimeRate/4);
+				state = START;
+			break;
+		}
+	}
+};
+
+#include<pthread.h>
+#include <mutex>
+#include <queue>
+
+class UartTx : public TimeProcess{
+public:
+
+	CData *tx;
+	uint32_t uartTimeRate;
+
+	enum State {START, DATA, STOP};
+	State state = START;
+	char data;
+	uint32_t counter;
+	pthread_t inputThreadId;
+	queue<uint8_t> inputsQueue;
+	mutex inputsMutex;
+
+	UartTx(CData *tx, uint32_t uartTimeRate){
+		this->tx = tx;
+		this->uartTimeRate = uartTimeRate;
+		schedule(uartTimeRate);
+		pthread_create(&inputThreadId, NULL, &inputThreadWrapper, this);
+		*tx = 1;
+	}
+
+	static void* inputThreadWrapper(void *uartTx){
+		((UartTx*)uartTx)->inputThread();
+		return NULL;
+	}
+
+	void inputThread(){
+		while(1){
+			uint8_t c = getchar();
+			inputsMutex.lock();
+			inputsQueue.push(c);
+			inputsMutex.unlock();
+		}
+	}
+
+	virtual void tick(){
+		switch(state){
+			case START:
+				inputsMutex.lock();
+				if(!inputsQueue.empty()){
+					data = inputsQueue.front();
+					inputsQueue.pop();
+					inputsMutex.unlock();
+					state = DATA;
+					counter = 0;
+					*tx = 0;
+					schedule(uartTimeRate);
+				} else {
+					inputsMutex.unlock();
+					schedule(uartTimeRate*50);
+				}
+			break;
+			case DATA:
+				*tx = (data >> counter) & 1;
+				counter++;
+				if(counter == 8){
+					state = STOP;
+				}
+				schedule(uartTimeRate);
+			break;
+			case STOP:
+				*tx = 1;
+				schedule(uartTimeRate);
+				state = START;
+			break;
+		}
+	}
+};