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- /*
-
- u8g_com_arduino_ssd_i2c.c
-
- com interface for arduino (AND atmega) and the SSDxxxx chip (SOLOMON) variant
- I2C protocol
-
- ToDo: Rename this to u8g_com_avr_ssd_i2c.c
-
- Universal 8bit Graphics Library
-
- Copyright (c) 2012, olikraus@gmail.com
- All rights reserved.
-
- Redistribution and use in source and binary forms, with or without modification,
- are permitted provided that the following conditions are met:
-
- * Redistributions of source code must retain the above copyright notice, this list
- of conditions and the following disclaimer.
-
- * Redistributions in binary form must reproduce the above copyright notice, this
- list of conditions and the following disclaimer in the documentation and/or other
- materials provided with the distribution.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- Special pin usage:
- U8G_PI_I2C_OPTION additional options
- U8G_PI_A0_STATE used to store the last value of the command/data register selection
- U8G_PI_SET_A0 1: Signal request to update I2C device with new A0_STATE, 0: Do nothing, A0_STATE matches I2C device
- U8G_PI_SCL clock line (NOT USED)
- U8G_PI_SDA data line (NOT USED)
-
- U8G_PI_RESET reset line (currently disabled, see below)
-
- Protocol:
- SLA, Cmd/Data Selection, Arguments
- The command/data register is selected by a special instruction byte, which is sent after SLA
-
- The continue bit is always 0 so that a (re)start is equired for the change from cmd to/data mode
- */
-
- #include "u8g.h"
-
- #define I2C_SLA (0x3c*2)
- //#define I2C_CMD_MODE 0x080
- #define I2C_CMD_MODE 0x000
- #define I2C_DATA_MODE 0x040
-
-
- uint8_t u8g_com_arduino_ssd_start_sequence(u8g_t *u8g)
- {
- /* are we requested to set the a0 state? */
- if ( u8g->pin_list[U8G_PI_SET_A0] == 0 )
- return 1;
-
- /* setup bus, might be a repeated start */
- if ( u8g_i2c_start(I2C_SLA) == 0 )
- return 0;
- if ( u8g->pin_list[U8G_PI_A0_STATE] == 0 )
- {
- if ( u8g_i2c_send_byte(I2C_CMD_MODE) == 0 )
- return 0;
- }
- else
- {
- if ( u8g_i2c_send_byte(I2C_DATA_MODE) == 0 )
- return 0;
- }
-
-
- u8g->pin_list[U8G_PI_SET_A0] = 0;
- return 1;
- }
-
- uint8_t u8g_com_arduino_ssd_i2c_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
- {
- switch(msg)
- {
- case U8G_COM_MSG_INIT:
- //u8g_com_arduino_digital_write(u8g, U8G_PI_SCL, HIGH);
- //u8g_com_arduino_digital_write(u8g, U8G_PI_SDA, HIGH);
- //u8g->pin_list[U8G_PI_A0_STATE] = 0; /* inital RS state: unknown mode */
-
- u8g_i2c_init(u8g->pin_list[U8G_PI_I2C_OPTION]);
-
- break;
-
- case U8G_COM_MSG_STOP:
- break;
-
- case U8G_COM_MSG_RESET:
- /* Currently disabled, but it could be enable. Previous restrictions have been removed */
- /* u8g_com_arduino_digital_write(u8g, U8G_PI_RESET, arg_val); */
- break;
-
- case U8G_COM_MSG_CHIP_SELECT:
- u8g->pin_list[U8G_PI_A0_STATE] = 0;
- u8g->pin_list[U8G_PI_SET_A0] = 1; /* force a0 to set again, also forces start condition */
- if ( arg_val == 0 )
- {
- /* disable chip, send stop condition */
- u8g_i2c_stop();
- }
- else
- {
- /* enable, do nothing: any byte writing will trigger the i2c start */
- }
- break;
-
- case U8G_COM_MSG_WRITE_BYTE:
- //u8g->pin_list[U8G_PI_SET_A0] = 1;
- if ( u8g_com_arduino_ssd_start_sequence(u8g) == 0 )
- return u8g_i2c_stop(), 0;
- if ( u8g_i2c_send_byte(arg_val) == 0 )
- return u8g_i2c_stop(), 0;
- // u8g_i2c_stop();
- break;
-
- case U8G_COM_MSG_WRITE_SEQ:
- //u8g->pin_list[U8G_PI_SET_A0] = 1;
- if ( u8g_com_arduino_ssd_start_sequence(u8g) == 0 )
- return u8g_i2c_stop(), 0;
- {
- register uint8_t *ptr = arg_ptr;
- while( arg_val > 0 )
- {
- if ( u8g_i2c_send_byte(*ptr++) == 0 )
- return u8g_i2c_stop(), 0;
- arg_val--;
- }
- }
- // u8g_i2c_stop();
- break;
-
- case U8G_COM_MSG_WRITE_SEQ_P:
- //u8g->pin_list[U8G_PI_SET_A0] = 1;
- if ( u8g_com_arduino_ssd_start_sequence(u8g) == 0 )
- return u8g_i2c_stop(), 0;
- {
- register uint8_t *ptr = arg_ptr;
- while( arg_val > 0 )
- {
- if ( u8g_i2c_send_byte(u8g_pgm_read(ptr)) == 0 )
- return 0;
- ptr++;
- arg_val--;
- }
- }
- // u8g_i2c_stop();
- break;
-
- case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
- u8g->pin_list[U8G_PI_A0_STATE] = arg_val;
- u8g->pin_list[U8G_PI_SET_A0] = 1; /* force a0 to set again */
-
- #ifdef OLD_CODE
- if ( i2c_state != 0 )
- {
- u8g_i2c_stop();
- i2c_state = 0;
- }
-
- if ( u8g_com_arduino_ssd_start_sequence(arg_val) == 0 )
- return 0;
-
- /* setup bus, might be a repeated start */
- /*
- if ( u8g_i2c_start(I2C_SLA) == 0 )
- return 0;
- if ( arg_val == 0 )
- {
- i2c_state = 1;
-
- if ( u8g_i2c_send_byte(I2C_CMD_MODE) == 0 )
- return 0;
- }
- else
- {
- i2c_state = 2;
- if ( u8g_i2c_send_byte(I2C_DATA_MODE) == 0 )
- return 0;
- }
- */
- #endif
- break;
- }
- return 1;
- }
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