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);
53 static __pdata serial_echo;
56 ao_serial_getchar(void) __critical
59 while (ao_fifo_empty(ao_usart1_rx_fifo))
60 ao_sleep(&ao_usart1_rx_fifo);
61 ao_fifo_remove(ao_usart1_rx_fifo, c);
63 printf("%02x ", ((int) c) & 0xff);
73 ao_serial_putchar(char c) __critical
75 while (ao_fifo_full(ao_usart1_tx_fifo))
76 ao_sleep(&ao_usart1_tx_fifo);
77 ao_fifo_insert(ao_usart1_tx_fifo, c);
78 ao_serial_tx1_start();
82 ao_serial_drain(void) __critical
84 while (!ao_fifo_empty(ao_usart1_tx_fifo))
85 ao_sleep(&ao_usart1_tx_fifo);
92 serial_echo = ao_cmd_lex_i != 0;
95 __code struct ao_cmds ao_serial_cmds[] = {
96 { 'M', monitor_serial, "M <enable> Monitor serial data" },
97 { 0, monitor_serial, NULL },
100 static const struct {
103 } ao_serial_speeds[] = {
104 /* [AO_SERIAL_SPEED_4800] = */ {
106 /* .gcr = */ (7 << UxGCR_BAUD_E_SHIFT) | UxGCR_ORDER_LSB
108 /* [AO_SERIAL_SPEED_9600] = */ {
110 /* .gcr = */ (8 << UxGCR_BAUD_E_SHIFT) | UxGCR_ORDER_LSB
112 /* [AO_SERIAL_SPEED_57600] = */ {
114 /* .gcr = */ (11 << UxGCR_BAUD_E_SHIFT) | UxGCR_ORDER_LSB
119 ao_serial_set_speed(uint8_t speed)
122 if (speed > AO_SERIAL_SPEED_57600)
124 U1BAUD = ao_serial_speeds[speed].baud;
125 U1GCR = ao_serial_speeds[speed].gcr;
131 /* Set up the USART pin assignment */
132 PERCFG = (PERCFG & ~PERCFG_U1CFG_ALT_MASK) | PERCFG_U1CFG_ALT_2;
134 /* ee has already set the P2SEL bits */
136 /* Make the USART pins be controlled by the USART */
137 P1SEL |= (1 << 6) | (1 << 7);
139 /* UART mode with receiver enabled */
140 U1CSR = (UxCSR_MODE_UART | UxCSR_RE);
142 /* Pick a 4800 baud rate */
143 ao_serial_set_speed(AO_SERIAL_SPEED_4800);
145 /* Reasonable serial parameters */
146 U1UCR = (UxUCR_FLUSH |
148 UxUCR_D9_ODD_PARITY |
150 UxUCR_PARITY_DISABLE |
151 UxUCR_SPB_1_STOP_BIT |
158 ao_cmd_register(&ao_serial_cmds[0]);