--- /dev/null
+/*
+ * Copyright © 2009 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"
+
+volatile __xdata struct ao_fifo ao_usart0_rx_fifo;
+volatile __xdata struct ao_fifo ao_usart0_tx_fifo;
+
+void
+ao_serial0_rx0_isr(void) __interrupt 2
+{
+ if (!ao_fifo_full(ao_usart0_rx_fifo))
+ ao_fifo_insert(ao_usart0_rx_fifo, U0DBUF);
+ ao_wakeup(&ao_usart0_rx_fifo);
+}
+
+static __xdata uint8_t ao_serial0_tx0_started;
+
+static void
+ao_serial0_tx0_start(void)
+{
+ if (!ao_fifo_empty(ao_usart0_tx_fifo) &&
+ !ao_serial0_tx0_started)
+ {
+ ao_serial0_tx0_started = 1;
+ ao_fifo_remove(ao_usart0_tx_fifo, U0DBUF);
+ }
+}
+
+void
+ao_serial0_tx0_isr(void) __interrupt 7
+{
+ UTX0IF = 0;
+ ao_serial0_tx0_started = 0;
+ ao_serial0_tx0_start();
+ ao_wakeup(&ao_usart0_tx_fifo);
+}
+
+char
+ao_serial0_getchar(void) __critical
+{
+ char c;
+ while (ao_fifo_empty(ao_usart0_rx_fifo))
+ ao_sleep(&ao_usart0_rx_fifo);
+ ao_fifo_remove(ao_usart0_rx_fifo, c);
+ return c;
+}
+
+#if USE_SERIAL_STDIN
+char
+ao_serial0_pollchar(void) __critical
+{
+ char c;
+ if (ao_fifo_empty(ao_usart0_rx_fifo))
+ return AO_READ_AGAIN;
+ ao_fifo_remove(ao_usart0_rx_fifo,c);
+ return c;
+}
+#endif
+
+void
+ao_serial0_putchar(char c) __critical
+{
+ while (ao_fifo_full(ao_usart0_tx_fifo))
+ ao_sleep(&ao_usart0_tx_fifo);
+ ao_fifo_insert(ao_usart0_tx_fifo, c);
+ ao_serial0_tx0_start();
+}
+
+void
+ao_serial0_drain(void) __critical
+{
+ while (!ao_fifo_empty(ao_usart0_tx_fifo))
+ ao_sleep(&ao_usart0_tx_fifo);
+}
+
+void
+ao_serial0_set_speed(uint8_t speed)
+{
+ ao_serial0_drain();
+ if (speed > AO_SERIAL_SPEED_57600)
+ return;
+ U1UCR |= UxUCR_FLUSH;
+ U1BAUD = ao_serial_speeds[speed].baud;
+ U1GCR = ao_serial_speeds[speed].gcr;
+}
+
+void
+ao_serial0_init(void)
+{
+#if HAS_SERIAL_0_ALT_1
+ /* Set up the USART pin assignment */
+ PERCFG = (PERCFG & ~PERCFG_U0CFG_ALT_MASK) | PERCFG_U0CFG_ALT_1;
+
+ P2DIR = (P2DIR & ~P2DIR_PRIP0_MASK) | P2DIR_PRIP0_USART0_USART1;
+
+ /* Make the USART pins be controlled by the USART */
+ P0SEL |= (1 << 2) | (1 << 3);
+#if HAS_SERIAL_0_HW_FLOW
+ P0SEL |= (1 << 4) | (1 << 5);
+#endif
+#else
+ /* Set up the USART pin assignment */
+ PERCFG = (PERCFG & ~PERCFG_U0CFG_ALT_MASK) | PERCFG_U0CFG_ALT_2;
+
+ P2SEL = (P2SEL & ~(P2SEL_PRI3P1_MASK | P2SEL_PRI0P1_MASK)) |
+ (P2SEL_PRI3P1_USART0 | P2SEL_PRI0P1_USART0);
+
+ /* Make the USART pins be controlled by the USART */
+ P1SEL |= (1 << 2) | (1 << 3);
+#if HAS_SERIAL_0_HW_FLOW
+ P1SEL |= (1 << 5) | (1 << 4);
+#endif
+#endif
+
+ /* UART mode with receiver enabled */
+ U0CSR = (UxCSR_MODE_UART | UxCSR_RE);
+
+ /* Pick a 9600 baud rate */
+ ao_serial0_set_speed(AO_SERIAL_SPEED_9600);
+
+ /* Reasonable serial parameters */
+ U0UCR = (UxUCR_FLUSH |
+#if HAS_SERIAL_0_HW_FLOW
+ UxUCR_FLOW_ENABLE |
+#else
+ UxUCR_FLOW_DISABLE |
+#endif
+ UxUCR_D9_EVEN_PARITY |
+ UxUCR_BIT9_8_BITS |
+ UxUCR_PARITY_DISABLE |
+ UxUCR_SPB_1_STOP_BIT |
+ UxUCR_STOP_HIGH |
+ UxUCR_START_LOW);
+
+ IEN0 |= IEN0_URX0IE;
+ IEN2 |= IEN2_UTX0IE;
+}
--- /dev/null
+/*
+ * 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"
+
+static void
+ao_ardu_serial_recv(void)
+{
+ char c;
+
+ for (;;) {
+ c = ao_serial0_getchar();
+ putchar (c);
+ }
+}
+
+static __xdata struct ao_task ao_ardu_serial_recv_task;
+
+void
+ao_ardu_serial_init (void)
+{
+ ao_serial0_init();
+ ao_add_task(&ao_ardu_serial_recv_task, ao_ardu_serial_recv, "recv");
+}