177 lines
4.2 KiB
C
177 lines
4.2 KiB
C
/*
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Special pin usage:
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U8G_PI_I2C_OPTION additional options
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U8G_PI_A0_STATE used to store the last value of the command/data register selection
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U8G_PI_SET_A0 1: Signal request to update I2C device with new A0_STATE, 0: Do nothing, A0_STATE matches I2C device
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U8G_PI_SCL clock line (NOT USED)
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U8G_PI_SDA data line (NOT USED)
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U8G_PI_RESET reset line (currently disabled, see below)
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Protocol:
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SLA, Cmd/Data Selection, Arguments
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The command/data register is selected by a special instruction byte, which is sent after SLA
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The continue bit is always 0 so that a (re)start is equired for the change from cmd to/data mode
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*/
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#include "u8g.h"
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#if defined(U8G_RASPBERRY_PI)
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#include <wiringPi.h>
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#include <wiringPiI2C.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#define I2C_SLA 0x3c
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#define I2C_CMD_MODE 0x000
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#define I2C_DATA_MODE 0x040
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#if defined(U8G_WITH_PINLIST)
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uint8_t u8g_com_raspberrypi_ssd_start_sequence(u8g_t *u8g)
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{
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/* are we requested to set the a0 state? */
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if ( u8g->pin_list[U8G_PI_SET_A0] == 0 )
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return 1;
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/* setup bus, might be a repeated start */
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if ( u8g_i2c_start(I2C_SLA) == 0 )
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return 0;
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if ( u8g->pin_list[U8G_PI_A0_STATE] == 0 )
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{
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if ( u8g_i2c_send_mode(I2C_CMD_MODE) == 0 )
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return 0;
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}
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else
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{
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if ( u8g_i2c_send_mode(I2C_DATA_MODE) == 0 )
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return 0;
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}
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u8g->pin_list[U8G_PI_SET_A0] = 0;
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return 1;
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}
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uint8_t u8g_com_raspberrypi_ssd_i2c_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr)
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{
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switch(msg)
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{
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case U8G_COM_MSG_INIT:
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u8g_i2c_init(u8g->pin_list[U8G_PI_I2C_OPTION]);
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u8g_SetPIOutput(u8g, U8G_PI_RESET);
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u8g_SetPIOutput(u8g, U8G_PI_A0);
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break;
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case U8G_COM_MSG_STOP:
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break;
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case U8G_COM_MSG_RESET:
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break;
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case U8G_COM_MSG_CHIP_SELECT:
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u8g->pin_list[U8G_PI_A0_STATE] = 0;
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u8g->pin_list[U8G_PI_SET_A0] = 1; /* force a0 to set again, also forces start condition */
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if ( arg_val == 0 )
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{
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/* disable chip, send stop condition */
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u8g_i2c_stop();
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}
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else
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{
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/* enable, do nothing: any byte writing will trigger the i2c start */
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}
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break;
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case U8G_COM_MSG_WRITE_BYTE:
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//u8g->pin_list[U8G_PI_SET_A0] = 1;
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if ( u8g_com_raspberrypi_ssd_start_sequence(u8g) == 0 )
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return u8g_i2c_stop(), 0;
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if ( u8g_i2c_send_byte(arg_val) == 0 )
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return u8g_i2c_stop(), 0;
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// u8g_i2c_stop();
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break;
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case U8G_COM_MSG_WRITE_SEQ:
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//u8g->pin_list[U8G_PI_SET_A0] = 1;
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if ( u8g_com_raspberrypi_ssd_start_sequence(u8g) == 0 )
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return u8g_i2c_stop(), 0;
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{
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register uint8_t *ptr = (uint8_t *)arg_ptr;
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while( arg_val > 0 )
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{
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if ( u8g_i2c_send_byte(*ptr++) == 0 )
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return u8g_i2c_stop(), 0;
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arg_val--;
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}
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}
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// u8g_i2c_stop();
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break;
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case U8G_COM_MSG_WRITE_SEQ_P:
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//u8g->pin_list[U8G_PI_SET_A0] = 1;
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if ( u8g_com_raspberrypi_ssd_start_sequence(u8g) == 0 )
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return u8g_i2c_stop(), 0;
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{
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register uint8_t *ptr = (uint8_t *)arg_ptr;
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while( arg_val > 0 )
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{
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if ( u8g_i2c_send_byte(u8g_pgm_read(ptr)) == 0 )
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return 0;
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ptr++;
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arg_val--;
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}
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}
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// u8g_i2c_stop();
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break;
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case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
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u8g->pin_list[U8G_PI_A0_STATE] = arg_val;
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u8g->pin_list[U8G_PI_SET_A0] = 1; /* force a0 to set again */
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#ifdef OLD_CODE
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if ( i2c_state != 0 )
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{
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u8g_i2c_stop();
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i2c_state = 0;
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}
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if ( u8g_com_raspberrypi_ssd_start_sequence(arg_val) == 0 )
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return 0;
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/* setup bus, might be a repeated start */
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/*
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if ( u8g_i2c_start(I2C_SLA) == 0 )
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return 0;
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if ( arg_val == 0 )
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{
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i2c_state = 1;
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if ( u8g_i2c_send_byte(I2C_CMD_MODE) == 0 )
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return 0;
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}
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else
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{
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i2c_state = 2;
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if ( u8g_i2c_send_byte(I2C_DATA_MODE) == 0 )
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return 0;
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}
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*/
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#endif
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break;
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}
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return 1;
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}
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#else /* defined(U8G_WITH_PINLIST) */
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uint8_t u8g_com_raspberrypi_ssd_i2c_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) {
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return 1;
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}
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#endif /* defined(U8G_WITH_PINLIST) */
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#endif
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