daily_automated

trunk/AVRProjects/ATMega168/Example_Serial/basic-in-atmega168.c

@@ -0,0 +1,97 @@
+/*
+    5-10-07
+    Copyright Spark Fun Electronics© 2007
+    Nathan Seidle
+    nathan at sparkfun.com
+    
+    Example basic printf input/output
+*/
+
+#include <stdio.h>
+#include <avr/io.h>
+
+#define FOSC 16000000
+#define BAUD 9600
+#define MYUBRR FOSC/16/BAUD-1
+
+#define sbi(var, mask)   ((var) |= (uint8_t)(1 << mask))
+#define cbi(var, mask)   ((var) &= (uint8_t)~(1 << mask))
+
+#define STATUS_LED 0
+
+//Define functions
+//======================
+void ioinit(void);      // initializes IO
+static int uart_putchar(char c, FILE *stream);
+uint8_t uart_getchar(void);
+
+static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
+
+void delay_ms(uint16_t x); // general purpose delay
+//======================
+
+int main (void)
+{
+	uint8_t key_press;
+	
+    ioinit(); //Setup IO pins and defaults
+
+	printf("Waiting for input:\n");
+
+    while(1)
+    {
+		key_press = uart_getchar();
+		
+		printf("I heard : %c\n", key_press);
+		
+		if(key_press == 'g') printf("  GO!\n");
+		if(key_press == 'X') printf("  EXIT\n");
+		if(key_press == 13) printf("  RETURN\n");
+    }
+   
+    return(0);
+}
+
+void ioinit (void)
+{
+    //1 = output, 0 = input
+    DDRB = 0b11101111; //PB4 = MISO 
+    DDRC = 0b11111111; //
+    DDRD = 0b11111110; //PORTD (RX on PD0)
+
+    //USART Baud rate: 9600
+    UBRR0H = MYUBRR >> 8;
+    UBRR0L = MYUBRR;
+    UCSR0B = (1<<RXEN0)|(1<<TXEN0);
+    
+    stdout = &mystdout; //Required for printf init
+}
+
+static int uart_putchar(char c, FILE *stream)
+{
+    if (c == '\n') uart_putchar('\r', stream);
+  
+    loop_until_bit_is_set(UCSR0A, UDRE0);
+    UDR0 = c;
+    
+    return 0;
+}
+
+uint8_t uart_getchar(void)
+{
+    while( !(UCSR0A & (1<<RXC0)) );
+    return(UDR0);
+}
+
+//General short delays
+void delay_ms(uint16_t x)
+{
+  uint8_t y, z;
+  for ( ; x > 0 ; x--){
+    for ( y = 0 ; y < 80 ; y++){
+      for ( z = 0 ; z < 40 ; z++){
+        asm volatile ("nop");
+      }
+    }
+  }
+}