altos: get avr-demo to build. Pull in AVR drivers and LCD driver

[fw/altos] / src / avr / ao_debug_avr.c

diff --git a/src/avr/ao_debug_avr.c b/src/avr/ao_debug_avr.c
new file mode 100644 (file)
index 0000000..2e41e15
--- /dev/null
+++ b/src/avr/ao_debug_avr.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2011 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include "ao.h"
+
+void
+uart_send(char c)
+{
+       loop_until_bit_is_set(UCSR1A, UDRE1);
+       UDR1 = c;
+}
+
+int
+uart_put(char c, FILE *stream)
+{
+       if (c == '\n')
+               uart_send('\r');
+       uart_send(c);
+       return 0;
+}
+
+int
+uart_get(FILE *stream)
+{
+       loop_until_bit_is_set(UCSR1A, RXC1);
+       return (int) UDR1 & 0xff;
+}
+
+void
+uart_init(uint16_t baud)
+{
+       PRR1 &= ~(1 << PRUSART1);
+       UBRR1L = baud;
+       UBRR1H = baud >> 8;
+       UCSR1A = 0;
+       UCSR1B = ((1 << RXEN1) |        /* Enable receiver */
+                 (1 << TXEN1));        /* Enable transmitter */
+       UCSR1C = ((0 << UMSEL10) |      /* Asynchronous mode */
+                 (0 << UPM10) |        /* No parity */
+                 (0 << USBS1) |        /* 1 stop bit */
+                 (3 << UCSZ10) |       /* 8 bit characters */
+                 (0 << UCPOL1));       /* MBZ for async mode */
+}
+
+static FILE mystdout = FDEV_SETUP_STREAM(uart_put, NULL, _FDEV_SETUP_WRITE);
+
+static FILE mystdin = FDEV_SETUP_STREAM(NULL, uart_get, _FDEV_SETUP_READ);
+
+void   ao_debug_init(void)
+{
+       uart_init(F_CPU / (16UL * 9600UL) - 1);
+
+       stdout = &mystdout;
+       stdin = &mystdin;
+
+       if (DDRB & AO_LED_RED) {
+               printf ("oops, starting all over\n");
+               for (;;)
+                       ;
+       }
+       DDRB |= (1 << 7);
+       PORTB |= (1 << 7);
+       printf ("debug initialized\n");
+}