1 files changed, 93 insertions, 0 deletions
diff --git a/usart.h b/usart.h
new file mode 100644
index 0000000..3a06baf
--- /dev/null
+++ b/usart.h
@@ -0,0 +1,93 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <stdint.h>
+
+#include "mcu/mcu_def.h"
+#include "buffers.h"
+
+#ifndef _IOE_USART_H_
+#define _IOE_USART_H_
+
+#ifndef MCUSUPPORT_USART
+#error "No USART interface is known on your mcu."
+#endif
+
+enum usartBaudrate {
+    USART_BAUDRATE_2400,
+    USART_BAUDRATE_4800,
+    USART_BAUDRATE_9600,
+    USART_BAUDRATE_19200,
+    USART_BAUDRATE_38400,
+    USART_BAUDRATE_57600,
+    USART_BAUDRATE_115200
+};
+
+enum usartParity {
+    USART_PARITY_NONE,
+    USART_PARITY_ODD,
+    USART_PARITY_EVEN
+};
+
+enum usartStopBit {
+    USART_STOPBIT_SINGLE = 1,
+    USART_STOPBIT_DOUBLE = 2
+};
+
+enum usartDataBits {
+    USART_DATABITS_5 = 5,
+    USART_DATABITS_6 = 6,
+    USART_DATABITS_7 = 7,
+    USART_DATABITS_8 = 8,
+    // USART_DATABITS_9 = 9 // Not supported yet
+};
+
+// Not supported yet. This is for synchronous mode only
+//enum usartClockPolarity {
+    //USART_CLOCKPOLARITY_FALLING,
+    //USART_CLOCKPOLARITY_RISING
+//};
+
+#define USART_FRAMEERROR  _BV(FE0)
+#define USART_DATAOVERRUN _BV(DOR0)
+#define USART_PARITYERROR _BV(UPE0)
+
+#if CONFIG_IOE_USART_INBUFFER_SIZE > 0
+#define _IOE_USART_INBUFFER
+volatile IOEBUFFER(_ioe_usart_inbuffer, CONFIG_IOE_USART_INBUFFER_SIZE);
+#endif
+#if CONFIG_IOE_USART_OUTBUFFER_SIZE > 0
+#define _IOE_USART_OUTBUFFER
+volatile IOEBUFFER(_ioe_usart_outbuffer, CONFIG_IOE_USART_OUTBUFFER_SIZE);
+#endif
+
+
+/*
+ * Initialize USART device with 115200 baud rate, no parity, single stop bit,
+ * and 8 data bits.
+ * This function serves as fast default initialization.
+ */
+void usart_init_uart(void);
+void usart_init_async(enum usartBaudrate,
+                      enum usartParity, enum usartStopBit,
+                      enum usartDataBits);
+void usart_send(uint8_t data);
+#ifdef _IOE_USART_OUTBUFFER
+void usart_send_str(char *str);
+#endif
+#ifdef _IOE_USART_INBUFFER
+uint8_t usart_get(void);
+#endif
+uint8_t usart_queryerror(void);
+int8_t usart_busy(void);
+#ifdef _IOE_USART_INBUFFER
+uint8_t usart_inbuffered(void);
+#endif
+#ifdef _IOE_USART_OUTBUFFER
+uint8_t usart_outbuffered(void);
+#endif
+
+// Following function must be user defined if relevant buffers not used.
+extern void (*usart_receive)(uint8_t data);
+extern void (*usart_sent)(void);
+
+#endif /* _IOE_USART_H_ */