2 * Copyright © 2009 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20 volatile __xdata struct ao_fifo ao_usart1_rx_fifo;
21 volatile __xdata struct ao_fifo ao_usart1_tx_fifo;
24 ao_serial_rx1_isr(void) interrupt 3
26 if (!ao_fifo_full(ao_usart1_rx_fifo))
27 ao_fifo_insert(ao_usart1_rx_fifo, U1DBUF);
28 ao_wakeup(&ao_usart1_rx_fifo);
31 static __xdata uint8_t ao_serial_tx1_started;
34 ao_serial_tx1_start(void)
36 if (!ao_fifo_empty(ao_usart1_tx_fifo) &&
37 !ao_serial_tx1_started)
39 ao_serial_tx1_started = 1;
40 ao_fifo_remove(ao_usart1_tx_fifo, U1DBUF);
45 ao_serial_tx1_isr(void) interrupt 14
48 ao_serial_tx1_started = 0;
49 ao_serial_tx1_start();
50 ao_wakeup(&ao_usart1_tx_fifo);
54 ao_serial_getchar(void) __critical
57 while (ao_fifo_empty(ao_usart1_rx_fifo))
58 ao_sleep(&ao_usart1_rx_fifo);
59 ao_fifo_remove(ao_usart1_rx_fifo, c);
64 ao_serial_putchar(char c) __critical
66 while (ao_fifo_full(ao_usart1_tx_fifo))
67 ao_sleep(&ao_usart1_tx_fifo);
68 ao_fifo_insert(ao_usart1_tx_fifo, c);
69 ao_serial_tx1_start();
76 while (ao_cmd_lex_c != '\n') {
77 ao_serial_putchar(ao_cmd_lex_c);
82 __code struct ao_cmds ao_serial_cmds[] = {
83 { 'S', send_serial, "S <data> Send data to serial line" },
84 { 0, send_serial, NULL },
90 /* Set up the USART pin assignment */
91 PERCFG = (PERCFG & ~PERCFG_U1CFG_ALT_MASK) | PERCFG_U1CFG_ALT_2;
93 /* ee has already set the P2SEL bits */
95 /* Make the USART pins be controlled by the USART */
96 P1SEL |= (1 << 6) | (1 << 7);
98 /* UART mode with receiver enabled */
99 U1CSR = (UxCSR_MODE_UART | UxCSR_RE);
101 /* Pick a 4800 baud rate */
102 U1BAUD = 163; /* 4800 */
103 U1GCR = 7 << UxGCR_BAUD_E_SHIFT; /* 4800 */
105 /* Reasonable serial parameters */
106 U1UCR = (UxUCR_FLUSH |
108 UxUCR_D9_ODD_PARITY |
110 UxUCR_PARITY_DISABLE |
111 UxUCR_SPB_1_STOP_BIT |
118 ao_cmd_register(&ao_serial_cmds[0]);