/* * Copyright © 2012 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. */ /* * ao_spi.c */ extern __xdata uint8_t ao_spi_mutex; #define ao_spi_get_mask(reg,mask,bus,speed) do { \ ao_mutex_get(&ao_spi_mutex); \ (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); \ (pin) = 0; \ } while (0) #define ao_spi_put_bit(reg,bit,pin,bus) do { \ (pin) = 1; \ ao_mutex_put(&ao_spi_mutex); \ } while (0) #define ao_gpio_token_paster(x,y) x ## y #define ao_gpio_token_evaluator(x,y) ao_gpio_token_paster(x,y) #define ao_gpio_set(port, bit, pin, v) do { \ if (v) \ (ao_gpio_token_evaluator(PORT,port)) |= (1 << bit); \ else \ (ao_gpio_token_evaluator(PORT,port)) &= ~(1 << bit); \ } 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 */ #define ao_enable_output(port, bit, pin, v) do { \ ao_gpio_set(port, bit, pin, v); \ ao_gpio_token_evaluator(DDR,port) |= (1 << bit); \ } while (0) 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); \ } while (0)