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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.
*/
/*
* ao_spi.c
*/
extern __xdata uint8_t ao_spi_mutex;
#define AO_SPI_SPEED_FAST 17
#define AO_SPI_SPEED_200kHz 13
#define ao_spi_set_speed(speed) (U0GCR = (UxGCR_CPOL_NEGATIVE | \
UxGCR_CPHA_FIRST_EDGE | \
UxGCR_ORDER_MSB | \
((speed) << UxGCR_BAUD_E_SHIFT)))
#define ao_spi_get_mask(reg,mask,bus,speed) do { \
ao_mutex_get(&ao_spi_mutex); \
ao_spi_set_speed(speed); \
(reg) &= ~(mask); \
} while (0)
#define ao_spi_put_mask(reg,mask,bus) do { \
(reg) |= (mask); \
ao_mutex_put(&ao_spi_mutex); \
} while (0)
#define ao_spi_get_bit(reg,bit,pin,bus,speed) do { \
ao_mutex_get(&ao_spi_mutex); \
ao_spi_set_speed(speed); \
pin = 0; \
} while (0)
#define ao_spi_put_bit(reg,bit,pin,bus) do { \
pin = 1; \
ao_mutex_put(&ao_spi_mutex); \
} while (0)
/*
* The SPI mutex must be held to call either of these
* functions -- this mutex covers the entire SPI operation,
* from chip select low to chip select high
*/
void
ao_spi_send_bus(void __xdata *block, uint16_t len) __reentrant;
void
ao_spi_recv_bus(void __xdata *block, uint16_t len) __reentrant;
#define ao_spi_send(block, len, bus) ao_spi_send_bus(block, len)
#define ao_spi_recv(block, len, bus) ao_spi_recv_bus(block, len)
void
ao_spi_init(void);
#define ao_spi_init_cs(port, mask) do { \
SPI_CS_PORT |= mask; \
SPI_CS_DIR |= mask; \
SPI_CS_SEL &= ~mask; \
} while (0)
#define cc1111_enable_output(port,dir,sel,mask,v) do { \
port = port & ~(mask) | v; \
dir |= mask; \
sel &= ~mask; \
} while (0)
#define disable_unreachable _Pragma("disable_warning 126")
#define token_paster(x,y) x ## y
#define token_evaluator(x,y) token_paster(x,y)
#define ao_enable_output(port,pin,v) cc1111_enable_output(port,token_evaluator(port,DIR), token_evaluator(port,SEL), 1 << pin, 1 << v)
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