From 8ba2035c78293bc312804722249df76dd4692d71 Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Sun, 9 Jun 2013 09:53:07 -0700 Subject: [PATCH] altos: Add driver for 74hc165 shift register Just reads one byte from the shift register using the SPI driver and returns it Signed-off-by: Keith Packard --- src/drivers/ao_74hc165.c | 58 ++++++++++++++++++++++++++++++++++++++++ src/drivers/ao_74hc165.h | 27 +++++++++++++++++++ 2 files changed, 85 insertions(+) create mode 100644 src/drivers/ao_74hc165.c create mode 100644 src/drivers/ao_74hc165.h diff --git a/src/drivers/ao_74hc165.c b/src/drivers/ao_74hc165.c new file mode 100644 index 00000000..f24fce37 --- /dev/null +++ b/src/drivers/ao_74hc165.c @@ -0,0 +1,58 @@ +/* + * Copyright © 2013 Keith Packard + * + * 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. + */ + +/* + * 74HC165 driver. + * Reads a single byte from the shift register + */ + +#include +#include + +uint8_t +ao_74hc165_read(void) +{ + static __xdata state; + ao_mutex_get(&ao_spi_mutex); + ao_spi_set_speed(AO_SPI_SPEED_FAST); + AO_74HC165_CS = 1; + ao_spi_recv(&state, 1, AO_74HC165_SPI_BUS); + AO_74HC165_CS = 0; + ao_mutex_put(&ao_spi_mutex); + return state; +} + +static void +ao_74hc165_cmd(void) +{ + uint8_t v; + + v = ao_74hc165_read(); + printf ("Switches: 0x%02x\n", v); +} + +static const struct ao_cmds ao_74hc165_cmds[] = { + { ao_74hc165_cmd, "L\0Show 74hc165" }, + { 0, NULL } +}; + +void +ao_74hc165_init(void) +{ + ao_enable_output(AO_74HC165_CS_PORT, AO_74HC165_CS_PIN, AO_74HC165_CS, 0); + ao_cmd_register(&ao_74hc165_cmds[0]); +} diff --git a/src/drivers/ao_74hc165.h b/src/drivers/ao_74hc165.h new file mode 100644 index 00000000..3ae51353 --- /dev/null +++ b/src/drivers/ao_74hc165.h @@ -0,0 +1,27 @@ +/* + * Copyright © 2013 Keith Packard + * + * 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. + */ + +#ifndef _AO_74HC165_H_ +#define _AO_74HC165_H_ + +uint8_t +ao_74hc165_read(void); + +void +ao_74hc165_init(void); + +#endif /* _AO_74HC165_H_ */ -- 2.30.2