Add implementation of USART and more ground changes

4 files changed, 117 insertions, 0 deletions

diff --git a/examples/usartecho/echo.c b/examples/usartecho/echo.c
new file mode 100644
index 0000000..4d978f7
--- /dev/null
+++ b/examples/usartecho/echo.c
@@ -0,0 +1,25 @@
+#include <avr/io.h>
+#include <util/delay.h>
+#include <string.h>
+#include "../../usart.h"
+
+void rec(uint8_t data) {
+    if (data)
+        usart_send(data);
+}
+
+int main() {
+    DDRB |= _BV(DDB1) | _BV(DDB2);
+    usart_init_uart();
+    SREG |= _BV(7);
+    usart_send('a');
+    usart_send('b');
+    usart_send('c');
+    usart_send('d');
+    usart_send_str("\n\rHello, there is UART echo!\n\r");
+    usart_receive = rec;
+
+    while (1);
+}
+
+
diff --git a/examples/usartecho/makefile b/examples/usartecho/makefile
new file mode 100644
index 0000000..343addc
--- /dev/null
+++ b/examples/usartecho/makefile
@@ -0,0 +1,29 @@
+MAKEFLAGS += --no-builtin-rules
+
+MMCU = atmega328p
+F_CPU = 16000000L
+IOE_PREFIX = ../..
+IOE_CFLAGS = -Os -ffunction-sections -fdata-sections -fshort-enums -Wall -g \
+			 -DCONFIG_IOE_USART_OUTBUFFER_SIZE=64 \
+			 -DCONFIG_IOE_USART_OUTBUFFER_MODE=0
+
+all: usart.hex
+	@echo Flash usart.hex to chip
+
+install: usart.hex
+	# TODO
+
+clean: ioeclean
+	$(RM) echo.o
+	$(RM) usart.elf usart.hex
+
+include ../../avr-ioe.mk
+
+usart.elf: %.elf: $(IOE_OBJ_USART) echo.o
+	avr-gcc -mmcu=$(MMCU) $^ -o $@
+
+usart.hex: %.hex: %.elf
+	avr-objcopy -O ihex -R .eeprom $< $@
+
+echo.o: %.o: %.c
+	avr-gcc $(IOE_CFLAGS) -c -o $@ $<
diff --git a/examples/usartecho/usart.elf b/examples/usartecho/usart.elf
new file mode 100755
index 0000000..211d0e9
--- /dev/null
+++ b/examples/usartecho/usart.elf
diff --git a/examples/usartecho/usart.hex b/examples/usartecho/usart.hex
new file mode 100644
index 0000000..0eb90f0
--- /dev/null
+++ b/examples/usartecho/usart.hex
@@ -0,0 +1,63 @@
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