2 * Copyright © 2012 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.
19 * PCA9922 LED driver. This uses SPI to send a single byte to the device to
20 * set the current state of the LEDs using the existing LED interface
25 static __xdata uint8_t ao_led_state;
30 /* Don't try the SPI bus during initialization */
33 ao_spi_get(AO_PCA9922_SPI_BUS);
34 ao_spi_set_speed(AO_PCA9922_SPI_BUS,AO_SPI_SPEED_FAST);
36 ao_spi_send(&ao_led_state, 1, AO_PCA9922_SPI_BUS);
38 ao_spi_put(AO_PCA9922_SPI_BUS);
42 ao_led_on(uint8_t colors)
44 ao_led_state |= colors;
49 ao_led_off(uint8_t colors)
51 ao_led_state &= ~colors;
56 ao_led_set(uint8_t colors)
58 ao_led_state = colors;
63 ao_led_set_mask(uint8_t colors, uint8_t mask)
65 ao_led_state = (ao_led_state & ~mask) | (colors & mask);
75 if (ao_cmd_status != ao_cmd_success)
77 ao_led_set(ao_cmd_lex_i);
78 printf("LEDs set to %02x\n", ao_cmd_lex_i);
81 static const struct ao_cmds ao_led_cmds[] = {
82 { ao_led_test, "l <value>\0Set LEDs to <value>" },
88 ao_led_toggle(uint8_t colors)
90 ao_led_state ^= colors;
95 ao_led_for(uint8_t colors, uint16_t ticks) __reentrant
103 ao_led_init(uint8_t enable)
106 ao_enable_output(AO_PCA9922_CS_PORT, AO_PCA9922_CS_PIN, AO_PCA9922_CS, 1);
108 ao_cmd_register(&ao_led_cmds[0]);