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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; either version 2 of the License, or
* (at your option) any later version.
*
* 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
*/
#if !HAS_SPI_0 && !HAS_SPI_1
#define HAS_SPI_0 1
#define SPI_0_ALT_2 1
#endif
#if HAS_SPI_0 && HAS_SPI_1
#define MULTI_SPI 1
#define N_SPI 2
#else
#define MULTI_SPI 0
#define N_SPI 1
#endif
extern __xdata uint8_t ao_spi_mutex[N_SPI];
#if MULTI_SPI
#define ao_spi_get(bus) ao_mutex_get(&ao_spi_mutex[bus])
#define ao_spi_put(bus) ao_mutex_put(&ao_spi_mutex[bus])
#else
#define ao_spi_get(bus) ao_mutex_get(&ao_spi_mutex[0])
#define ao_spi_put(bus) ao_mutex_put(&ao_spi_mutex[0])
#endif
#define AO_SPI_SPEED_FAST 17
#define AO_SPI_SPEED_200kHz 13
#if MULTI_SPI
#define ao_spi_set_speed(bus,speed) (*(bus ? &U1GCR : &U0GCR) =(UxGCR_CPOL_NEGATIVE | \
UxGCR_CPHA_FIRST_EDGE | \
UxGCR_ORDER_MSB | \
((speed) << UxGCR_BAUD_E_SHIFT)))
#else
#define ao_spi_set_speed(bus,speed) (U0GCR = (UxGCR_CPOL_NEGATIVE | \
UxGCR_CPHA_FIRST_EDGE | \
UxGCR_ORDER_MSB | \
((speed) << UxGCR_BAUD_E_SHIFT)))
#endif
#define ao_spi_get_slave(bus) do { \
ao_spi_get(bus); \
ao_spi_set_speed(bus,AO_SPI_SPEED_FAST); \
} while (0)
#define ao_spi_put_slave(bus) do { \
ao_spi_put(bus); \
} while (0)
#define ao_spi_get_mask(reg,mask,bus,speed) do { \
ao_spi_get(bus); \
ao_spi_set_speed(bus,speed); \
(reg) &= ~(mask); \
} while (0)
#define ao_spi_put_mask(reg,mask,bus) do { \
(reg) |= (mask); \
ao_spi_put(bus); \
} while (0)
#define ao_spi_get_bit(reg,bit,pin,bus,speed) do { \
ao_spi_get(bus); \
ao_spi_set_speed(bus,speed); \
pin = 0; \
} while (0)
#define ao_spi_put_bit(reg,bit,pin,bus) do { \
pin = 1; \
ao_spi_put(bus); \
} 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
*/
#if MULTI_SPI
void
ao_spi_send(void __xdata *block, uint16_t len, uint8_t bus) __reentrant;
void
ao_spi_recv(void __xdata *block, uint16_t len, uint8_t bus) __reentrant;
#else
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)
#endif
#if AO_SPI_SLAVE
void
ao_spi_send_wait(void);
void
ao_spi_recv_wait(void);
#endif
void
ao_spi_init(void);
#define token_paster(x,y) x ## y
#define token_paster3(x,y,z) x ## y ## z
#define token_evaluator(x,y) token_paster(x,y)
#define token_evaluator3(x,y,z) token_paster3(x,y,z)
#define ao_spi_init_cs(port, mask) do { \
port |= mask; \
token_evaluator(port,DIR) |= mask; \
token_evaluator(port,SEL) &= ~mask; \
} while (0)
#define cc1111_enable_output(port,dir,sel,pin,bit,v) do { \
pin = v; \
dir |= (1 << bit); \
sel &= ~(1 << bit); \
} while (0)
#define disable_unreachable _Pragma("disable_warning 126")
#define ao_enable_output(port,bit,pin,v) cc1111_enable_output(port,token_evaluator(port,DIR), token_evaluator(port,SEL), pin, bit, v)
#define ao_gpio_set(port, bit, pin, v) ((pin) = (v))
#define ao_gpio_get(port, bit, pin) (pin)
#define ao_gpio_get_bits(port) (port)
#define ao_gpio_set_bits(port, bits) ((port) |= bits)
#define ao_gpio_clr_bits(port, bits) ((port) &= ~bits)
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