Intial commit

lib/usart/.gitignore

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+.vscode/
+bin/

lib/usart/LICENSE

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+MIT License Copyright (c) <year> <copyright holders>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

lib/usart/README.md

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+# usart
+

lib/usart/makefile

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+MCU=atmega32
+F_CPU=8000000
+PROG=dragon_jtag
+PORT?=/dev/ttyUSB0
+CC=avr-g++
+OBJCOPY=avr-objcopy
+CFLAGS=-Wall -g  -mmcu=${MCU} -DF_CPU=${F_CPU} -I.
+TARGET=main
+SRCS= src/*.cpp test/main.cpp 
+
+all: build flash
+
+build:
+	${CC} ${CFLAGS} -o bin/${TARGET}.bin  ${SRCS}
+	${CC} ${CFLAGS} -o bin/${TARGET}.elf  ${SRCS}
+	${OBJCOPY} -j .text -j .data -O ihex bin/${TARGET}.bin bin/${TARGET}.hex
+
+flash:
+	avrdude -p ${MCU} -c ${PROG}  -U flash:w:bin/main.hex
+
+clean:
+	rm -f bin/* 
+
+term: 
+	python3 term.py
+
+avarice:
+	avarice --program --file bin/main.elf --part atmega32 --dragon :4242

lib/usart/src/usart.cpp

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+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include "usart.h"
+
+namespace usart
+{
+    namespace {
+        static FILE mystdout;
+    }
+    
+    void init( unsigned long baud) {
+        fdev_setup_stream(&mystdout, put_printf, NULL, _FDEV_SETUP_WRITE);
+        stdout = &mystdout;
+        const unsigned int ubrr =  F_CPU/8/baud-1;
+
+        /*Set baud rate */
+        
+        
+        #if defined __AVR_ATmega328P__
+            UBRR0H = (unsigned char)(ubrr>>8);
+            UBRR0L = (unsigned char)ubrr;
+            UCSR0A |= (1<<U2X0);
+            //Enable receiver and transmitter 
+            UCSR0B = (1<<RXEN0)|(1<<TXEN0);
+            //UCSRB |= (1<< RXCIE)|(1<<TXCIE);
+            /* Set frame format: 8data, 2stop bit */
+            UCSR0C = (1<<USBS0)|(3<<UCSZ00);
+        #elif defined  __AVR_ATmega32__ || defined __AVR_ATmega16__
+            UBRRH = (unsigned char)(ubrr>>8);
+            UBRRL = (unsigned char)ubrr;
+            UCSRA |= (1<<U2X);
+            //Enable receiver and transmitter 
+            UCSRB = (1<<RXEN)|(1<<TXEN);
+            //UCSRB |= (1<< RXCIE)|(1<<TXCIE);
+            /* Set frame format: 8data, 2stop bit */
+            UCSRC = (1 << URSEL)|(3<<UCSZ0);
+        #endif
+    
+    }
+
+    void put(char data) {
+        #if defined __AVR_ATmega328P__
+            while ( !( UCSR0A & (1<<UDRE0)) ); UDR0 = data;
+        #elif defined  __AVR_ATmega32__ || defined __AVR_ATmega16__
+            while ( !( UCSRA & (1<<UDRE)) ); UDR = data;
+        #endif
+        
+       
+    }
+
+    char get( void ) {
+        #if defined __AVR_ATmega328P__
+            while ( !(UCSR0A & (1<<RXC0)) ); return UDR0;
+        #elif defined  __AVR_ATmega32__ || defined __AVR_ATmega16__
+            while ( !(UCSRA & (1<<RXC)) ); return UDR;
+        #endif
+    }       
+   
+    int put_printf(char var, FILE *stream) {
+        put(var);
+        return 0;
+    }
+} // namespace usart
+
+

lib/usart/src/usart.h

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+#pragma once
+
+#include <stdio.h>
+
+namespace usart
+{
+    void init(unsigned long baud);
+    void put(char data );
+    char get();
+    int put_printf(char var, FILE *stream);
+} // namespace usart
+
+
+

lib/usart/term.py

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+import serial
+from time import sleep
+
+with serial.Serial('/dev/ttyUSB0', 9600, timeout=1) as ser:
+    ser.write(b'a')
+    while True:
+        x = ser.read()          # read one byte
+        if x != b'':
+            pass
+        print(x.decode('utf'))
+        #ser.write(b'a')
+        #print(ser.read())
+        sleep(1)

lib/usart/test/main.cpp

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+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include "../src/usart.h"
+#include <util/delay.h>
+
+
+
+
+
+int main (void) {
+	DDRD |= (1<<PD3)|(1<<PD4)|(1<<PD5);
+	usart::init(9600);
+	for (;;) {// Loop forever
+		usart::put('A');
+		//printf("Hello");
+		PORTD ^= (1<<PD3)|(1<<PD4)|(1<<PD5);
+		_delay_ms(1000);
+	
+	}   
+}
+