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/*
* Copyright © 2012 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.
*/
/*
* PCA9922 LED driver. This uses SPI to send a single byte to the device to
* set the current state of the LEDs using the existing LED interface
*/
#include <ao.h>
static __xdata uint8_t ao_led_state;
static void
ao_led_apply(void)
{
/* Don't try the SPI bus during initialization */
if (!ao_cur_task)
return;
ao_spi_get(AO_PCA9922_SPI_BUS);
ao_spi_set_speed(AO_PCA9922_SPI_BUS,AO_SPI_SPEED_FAST);
AO_PCA9922_CS = 1;
ao_spi_send(&ao_led_state, 1, AO_PCA9922_SPI_BUS);
AO_PCA9922_CS = 0;
ao_spi_put(AO_PCA9922_SPI_BUS);
}
void
ao_led_on(uint8_t colors)
{
ao_led_state |= colors;
ao_led_apply();
}
void
ao_led_off(uint8_t colors)
{
ao_led_state &= ~colors;
ao_led_apply();
}
void
ao_led_set(uint8_t colors)
{
ao_led_state = colors;
ao_led_apply();
}
void
ao_led_set_mask(uint8_t colors, uint8_t mask)
{
ao_led_state = (ao_led_state & ~mask) | (colors & mask);
ao_led_apply();
}
#define LED_TEST 1
#if LED_TEST
static void
ao_led_test(void)
{
ao_cmd_hexbyte();
if (ao_cmd_status != ao_cmd_success)
return;
ao_led_set(ao_cmd_lex_i);
printf("LEDs set to %02x\n", ao_cmd_lex_i);
}
static const struct ao_cmds ao_led_cmds[] = {
{ ao_led_test, "l <value>\0Set LEDs to <value>" },
{ 0, NULL }
};
#endif
void
ao_led_toggle(uint8_t colors)
{
ao_led_state ^= colors;
ao_led_apply();
}
void
ao_led_for(uint8_t colors, uint16_t ticks) __reentrant
{
ao_led_on(colors);
ao_delay(ticks);
ao_led_off(colors);
}
void
ao_led_init(uint8_t enable)
{
(void) enable;
ao_enable_output(AO_PCA9922_CS_PORT, AO_PCA9922_CS_PIN, AO_PCA9922_CS, 1);
#if LED_TEST
ao_cmd_register(&ao_led_cmds[0]);
#endif
}
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