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U8x8lib.cpp
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U8x8lib.cpp
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/*
U8x8lib.cpp
Arduino specific low level functions
Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
Copyright (c) 2016, 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.
*/
#include "U8x8lib.h"
#ifdef ARDUINO
#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
# ifdef U8X8_HAVE_HW_I2C_TEENSY3
# include <i2c_t3.h>
# else
# include <Wire.h>
# ifdef U8X8_HAVE_2ND_HW_I2C
# if defined(MINICORE) && defined(__AVR_ATmega328PB__)
# include <Wire1.h>
# endif
# endif
# endif
#endif /* U8X8_HAVE_HW_I2C */
#endif /* ARDUINO */
/*=============================================*/
size_t U8X8::write(uint8_t v)
{
if ( v == '\n' )
{
uint8_t dy = u8x8_pgm_read(u8x8.font+3); /* new 2019 format */
ty+=dy;
tx=0;
}
else
{
uint8_t dx = u8x8_pgm_read(u8x8.font+2); /* new 2019 format */
u8x8_DrawGlyph(&u8x8, tx, ty, v);
tx+=dx;
}
return 1;
}
/*=============================================*/
/*=== ARDUINO GPIO & DELAY ===*/
#ifdef ARDUINO
#ifdef U8X8_USE_PINS
extern "C" uint8_t u8x8_gpio_and_delay_arduino(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, U8X8_UNUSED void *arg_ptr)
{
uint8_t i;
switch(msg)
{
case U8X8_MSG_GPIO_AND_DELAY_INIT:
for( i = 0; i < U8X8_PIN_CNT; i++ )
if ( u8x8->pins[i] != U8X8_PIN_NONE )
{
if ( i < U8X8_PIN_OUTPUT_CNT )
{
pinMode(u8x8->pins[i], OUTPUT);
}
else
{
#ifdef INPUT_PULLUP
pinMode(u8x8->pins[i], INPUT_PULLUP);
#else
pinMode(u8x8->pins[i], OUTPUT);
digitalWrite(u8x8->pins[i], 1);
#endif
}
}
break;
#ifndef __AVR__
/* this case is not compiled for any AVR, because AVR uC are so slow */
/* that this delay does not matter */
case U8X8_MSG_DELAY_NANO:
delayMicroseconds(arg_int==0?0:1);
break;
#endif
case U8X8_MSG_DELAY_10MICRO:
/* not used at the moment */
break;
case U8X8_MSG_DELAY_100NANO:
/* not used at the moment */
break;
case U8X8_MSG_DELAY_MILLI:
delay(arg_int);
break;
case U8X8_MSG_DELAY_I2C:
/* arg_int is 1 or 4: 100KHz (5us) or 400KHz (1.25us) */
delayMicroseconds(arg_int<=2?5:2);
break;
case U8X8_MSG_GPIO_I2C_CLOCK:
case U8X8_MSG_GPIO_I2C_DATA:
if ( arg_int == 0 )
{
pinMode(u8x8_GetPinValue(u8x8, msg), OUTPUT);
digitalWrite(u8x8_GetPinValue(u8x8, msg), 0);
}
else
{
#ifdef INPUT_PULLUP
pinMode(u8x8_GetPinValue(u8x8, msg), INPUT_PULLUP);
#else
pinMode(u8x8_GetPinValue(u8x8, msg), OUTPUT);
digitalWrite(u8x8_GetPinValue(u8x8, msg), 1);
#endif
}
break;
default:
if ( msg >= U8X8_MSG_GPIO(0) )
{
i = u8x8_GetPinValue(u8x8, msg);
if ( i != U8X8_PIN_NONE )
{
if ( u8x8_GetPinIndex(u8x8, msg) < U8X8_PIN_OUTPUT_CNT )
{
digitalWrite(i, arg_int);
}
else
{
if ( u8x8_GetPinIndex(u8x8, msg) == U8X8_PIN_OUTPUT_CNT )
{
// call yield() for the first pin only, u8x8 will always request all the pins, so this should be ok
yield();
}
u8x8_SetGPIOResult(u8x8, digitalRead(i) == 0 ? 0 : 1);
}
}
break;
}
return 0;
}
return 1;
}
#endif // U8X8_USE_PINS
/*=============================================*/
/*=== 3 WIRE SOFTWARE SPI ===*/
/*
replacement for a more faster u8x8_byte_3wire_sw_spi
in general u8x8_byte_3wire_sw_spi could be a fallback:
uint8_t u8x8_byte_arduino_3wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
return u8x8_byte_3wire_sw_spi(u8x8, msg,arg_int, arg_ptr);
}
*/
#ifndef __AVR_ARCH__
#define __AVR_ARCH__ 0
#endif
#if !defined(U8X8_USE_PINS)
/* no pin information (very strange), so fallback */
uint8_t u8x8_byte_arduino_3wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
return u8x8_byte_3wire_sw_spi(u8x8, msg,arg_int, arg_ptr);
}
#elif __AVR_ARCH__ == 4 || __AVR_ARCH__ == 5 || __AVR_ARCH__ == 51 || __AVR_ARCH__ == 6 || __AVR_ARCH__ == 103
/* this function completely replaces u8x8_byte_4wire_sw_spi*/
extern "C" uint8_t u8x8_byte_arduino_3wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
uint8_t i;
uint8_t takeover_edge = u8x8_GetSPIClockPhase(u8x8);
uint16_t b;
uint8_t *data;
/* the following static vars are recalculated in U8X8_MSG_BYTE_START_TRANSFER */
/* so, it should be possible to use multiple displays with different pins */
static volatile uint8_t *arduino_clock_port;
static uint8_t arduino_clock_mask;
static uint8_t arduino_clock_n_mask;
static volatile uint8_t *arduino_data_port;
static uint8_t arduino_data_mask;
static uint8_t arduino_data_n_mask;
static uint8_t last_dc;
switch(msg)
{
case U8X8_MSG_BYTE_SEND:
data = (uint8_t *)arg_ptr;
if ( takeover_edge == 0 )
{
while( arg_int > 0 )
{
b = *data;
if ( last_dc != 0 )
b |= 256;
data++;
arg_int--;
/* issue 156, check for speed */
#if F_CPU <= 17000000
if ( b == 0 )
{
*arduino_data_port &= arduino_data_n_mask;
for( i = 0; i < 9; i++ )
{
*arduino_clock_port |= arduino_clock_mask;
*arduino_clock_port &= arduino_clock_n_mask;
}
}
else
#endif
{
for( i = 0; i < 9; i++ )
{
if ( b & 256 )
*arduino_data_port |= arduino_data_mask;
else
*arduino_data_port &= arduino_data_n_mask;
*arduino_clock_port |= arduino_clock_mask;
b <<= 1;
*arduino_clock_port &= arduino_clock_n_mask;
}
}
}
}
else
{
while( arg_int > 0 )
{
b = *data;
if ( last_dc != 0 )
b |= 256;
data++;
arg_int--;
/* issue 156, check for speed */
#if F_CPU <= 17000000
if ( b == 0 )
{
*arduino_data_port &= arduino_data_n_mask;
for( i = 0; i < 9; i++ )
{
*arduino_clock_port &= arduino_clock_n_mask;
*arduino_clock_port |= arduino_clock_mask;
}
}
else
#endif
{
for( i = 0; i < 9; i++ )
{
if ( b & 256 )
*arduino_data_port |= arduino_data_mask;
else
*arduino_data_port &= arduino_data_n_mask;
*arduino_clock_port &= arduino_clock_n_mask;
b <<= 1;
*arduino_clock_port |= arduino_clock_mask;
}
}
}
}
break;
case U8X8_MSG_BYTE_INIT:
/* disable chipselect */
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_disable_level);
/* no wait required here */
/* for SPI: setup correct level of the clock signal */
u8x8_gpio_SetSPIClock(u8x8, u8x8_GetSPIClockPhase(u8x8));
break;
case U8X8_MSG_BYTE_SET_DC:
last_dc = arg_int;
break;
case U8X8_MSG_BYTE_START_TRANSFER:
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_enable_level);
u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->post_chip_enable_wait_ns, NULL);
/* there is no consistency checking for u8x8->pins[U8X8_PIN_SPI_CLOCK] */
arduino_clock_port = portOutputRegister(digitalPinToPort(u8x8->pins[U8X8_PIN_SPI_CLOCK]));
arduino_clock_mask = digitalPinToBitMask(u8x8->pins[U8X8_PIN_SPI_CLOCK]);
arduino_clock_n_mask = ~arduino_clock_mask;
/* there is no consistency checking for u8x8->pins[U8X8_PIN_SPI_DATA] */
arduino_data_port = portOutputRegister(digitalPinToPort(u8x8->pins[U8X8_PIN_SPI_DATA]));
arduino_data_mask = digitalPinToBitMask(u8x8->pins[U8X8_PIN_SPI_DATA]);
arduino_data_n_mask = ~arduino_data_mask;
break;
case U8X8_MSG_BYTE_END_TRANSFER:
u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->pre_chip_disable_wait_ns, NULL);
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_disable_level);
break;
default:
return 0;
}
return 1;
}
#else
/* fallback */
uint8_t u8x8_byte_arduino_3wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
return u8x8_byte_3wire_sw_spi(u8x8, msg,arg_int, arg_ptr);
}
#endif
/*=============================================*/
/*=== 4 WIRE SOFTWARE SPI ===*/
/*
replacement for a more faster u8x8_byte_4wire_sw_spi
in general u8x8_byte_4wire_sw_spi could be a fallback:
uint8_t u8x8_byte_arduino_4wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
return u8x8_byte_4wire_sw_spi(u8x8, msg,arg_int, arg_ptr);
}
*/
#ifndef __AVR_ARCH__
#define __AVR_ARCH__ 0
#endif
#if !defined(U8X8_USE_PINS)
/* no pin information (very strange), so fallback */
uint8_t u8x8_byte_arduino_4wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
return u8x8_byte_4wire_sw_spi(u8x8, msg,arg_int, arg_ptr);
}
#elif __AVR_ARCH__ == 4 || __AVR_ARCH__ == 5 || __AVR_ARCH__ == 51 || __AVR_ARCH__ == 6 || __AVR_ARCH__ == 103
/* this function completely replaces u8x8_byte_4wire_sw_spi*/
extern "C" uint8_t u8x8_byte_arduino_4wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
uint8_t SREG_backup;
uint8_t i, b;
uint8_t *data;
uint8_t takeover_edge = u8x8_GetSPIClockPhase(u8x8);
//uint8_t not_takeover_edge = 1 - takeover_edge;
/* the following static vars are recalculated in U8X8_MSG_BYTE_START_TRANSFER */
/* so, it should be possible to use multiple displays with different pins */
static volatile uint8_t *arduino_clock_port;
static uint8_t arduino_clock_mask;
static uint8_t arduino_clock_n_mask;
static volatile uint8_t *arduino_data_port;
static uint8_t arduino_data_mask;
static uint8_t arduino_data_n_mask;
switch(msg)
{
case U8X8_MSG_BYTE_SEND:
data = (uint8_t *)arg_ptr;
if ( takeover_edge == 0 )
{
while( arg_int > 0 )
{
b = *data;
data++;
arg_int--;
SREG_backup = SREG; cli();
/* issue 156, check for speed */
#if F_CPU <= 17000000
if ( b == 0 )
{
*arduino_data_port &= arduino_data_n_mask;
for( i = 0; i < 8; i++ )
{
*arduino_clock_port |= arduino_clock_mask;
*arduino_clock_port &= arduino_clock_n_mask;
}
}
else
#endif
{
for( i = 0; i < 8; i++ )
{
if ( b & 128 )
*arduino_data_port |= arduino_data_mask;
else
*arduino_data_port &= arduino_data_n_mask;
*arduino_clock_port |= arduino_clock_mask;
b <<= 1;
*arduino_clock_port &= arduino_clock_n_mask;
}
}
SREG = SREG_backup;
}
}
else
{
while( arg_int > 0 )
{
b = *data;
data++;
arg_int--;
SREG_backup = SREG; cli();
/* issue 156, check for speed */
#if F_CPU <= 17000000
if ( b == 0 )
{
*arduino_data_port &= arduino_data_n_mask;
for( i = 0; i < 8; i++ )
{
*arduino_clock_port &= arduino_clock_n_mask;
*arduino_clock_port |= arduino_clock_mask;
}
}
else
#endif
{
for( i = 0; i < 8; i++ )
{
if ( b & 128 )
*arduino_data_port |= arduino_data_mask;
else
*arduino_data_port &= arduino_data_n_mask;
*arduino_clock_port &= arduino_clock_n_mask;
b <<= 1;
*arduino_clock_port |= arduino_clock_mask;
}
}
SREG = SREG_backup;
}
}
break;
case U8X8_MSG_BYTE_INIT:
/* disable chipselect */
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_disable_level);
/* no wait required here */
/* for SPI: setup correct level of the clock signal */
u8x8_gpio_SetSPIClock(u8x8, u8x8_GetSPIClockPhase(u8x8));
break;
case U8X8_MSG_BYTE_SET_DC:
u8x8_gpio_SetDC(u8x8, arg_int);
break;
case U8X8_MSG_BYTE_START_TRANSFER:
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_enable_level);
u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->post_chip_enable_wait_ns, NULL);
/* there is no consistency checking for u8x8->pins[U8X8_PIN_SPI_CLOCK] */
arduino_clock_port = portOutputRegister(digitalPinToPort(u8x8->pins[U8X8_PIN_SPI_CLOCK]));
arduino_clock_mask = digitalPinToBitMask(u8x8->pins[U8X8_PIN_SPI_CLOCK]);
arduino_clock_n_mask = ~arduino_clock_mask;
/* there is no consistency checking for u8x8->pins[U8X8_PIN_SPI_DATA] */
arduino_data_port = portOutputRegister(digitalPinToPort(u8x8->pins[U8X8_PIN_SPI_DATA]));
arduino_data_mask = digitalPinToBitMask(u8x8->pins[U8X8_PIN_SPI_DATA]);
arduino_data_n_mask = ~arduino_data_mask;
break;
case U8X8_MSG_BYTE_END_TRANSFER:
u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->pre_chip_disable_wait_ns, NULL);
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_disable_level);
break;
default:
return 0;
}
return 1;
}
#elif defined(__SAM3X8E__) /* Arduino DUE */
/* this function completely replaces u8x8_byte_4wire_sw_spi*/
extern "C" uint8_t u8x8_byte_arduino_4wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
uint8_t i, b;
uint16_t us = ((u8x8->display_info->sck_pulse_width_ns + 999)/1000);
uint8_t *data;
uint8_t takeover_edge = u8x8_GetSPIClockPhase(u8x8);
//uint8_t not_takeover_edge = 1 - takeover_edge;
/* the following static vars are recalculated in U8X8_MSG_BYTE_START_TRANSFER */
/* so, it should be possible to use multiple displays with different pins */
/*
static volatile uint32_t *arduino_clock_port;
static uint32_t arduino_clock_mask;
static uint32_t arduino_clock_n_mask;
static volatile uint32_t *arduino_data_port;
static uint32_t arduino_data_mask;
static uint32_t arduino_data_n_mask;
*/
static WoReg *arduinoSetClockPort, *arduinoUnsetClockPort;
static uint32_t arduino_clock_mask;
static WoReg *arduinoSetDataPort, *arduinoUnsetDataPort;
static uint32_t arduino_data_mask;
switch(msg)
{
case U8X8_MSG_BYTE_SEND:
data = (uint8_t *)arg_ptr;
if ( takeover_edge == 0 )
{
while( arg_int > 0 )
{
b = *data;
data++;
arg_int--;
{
for( i = 0; i < 8; i++ )
{
/*
if ( b & 128 )
*arduino_data_port |= arduino_data_mask;
else
*arduino_data_port &= arduino_data_n_mask;
*/
if (b & 128)
*arduinoSetDataPort = arduino_data_mask;
else
*arduinoUnsetDataPort = arduino_data_mask;
//delayMicroseconds(us);
//*arduino_clock_port |= arduino_clock_mask;
*arduinoSetClockPort = arduino_clock_mask;
b <<= 1;
delayMicroseconds(us);
//*arduino_clock_port &= arduino_clock_n_mask;
*arduinoUnsetClockPort = arduino_clock_mask;
}
}
}
}
else
{
while( arg_int > 0 )
{
b = *data;
data++;
arg_int--;
{
for( i = 0; i < 8; i++ )
{
/*
if ( b & 128 )
*arduino_data_port |= arduino_data_mask;
else
*arduino_data_port &= arduino_data_n_mask;
*/
if (b & 128)
*arduinoSetDataPort = arduino_data_mask;
else
*arduinoUnsetDataPort = arduino_data_mask;
//delayMicroseconds(us);
//*arduino_clock_port &= arduino_clock_n_mask;
*arduinoUnsetClockPort = arduino_clock_mask;
b <<= 1;
delayMicroseconds(us);
//*arduino_clock_port |= arduino_clock_mask;
*arduinoSetClockPort = arduino_clock_mask;
}
}
}
}
break;
case U8X8_MSG_BYTE_INIT:
/* disable chipselect */
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_disable_level);
/* no wait required here */
/* for SPI: setup correct level of the clock signal */
u8x8_gpio_SetSPIClock(u8x8, u8x8_GetSPIClockPhase(u8x8));
break;
case U8X8_MSG_BYTE_SET_DC:
u8x8_gpio_SetDC(u8x8, arg_int);
break;
case U8X8_MSG_BYTE_START_TRANSFER:
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_enable_level);
u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->post_chip_enable_wait_ns, NULL);
/* there is no consistency checking for u8x8->pins[U8X8_PIN_SPI_CLOCK] */
/*
arduino_clock_port = portOutputRegister(digitalPinToPort(u8x8->pins[U8X8_PIN_SPI_CLOCK]));
arduino_clock_mask = digitalPinToBitMask(u8x8->pins[U8X8_PIN_SPI_CLOCK]);
arduino_clock_n_mask = ~arduino_clock_mask;
arduino_data_port = portOutputRegister(digitalPinToPort(u8x8->pins[U8X8_PIN_SPI_DATA]));
arduino_data_mask = digitalPinToBitMask(u8x8->pins[U8X8_PIN_SPI_DATA]);
arduino_data_n_mask = ~arduino_data_mask;
*/
arduinoSetClockPort = &digitalPinToPort(u8x8->pins[U8X8_PIN_SPI_CLOCK])->PIO_SODR;
arduinoUnsetClockPort = &digitalPinToPort(u8x8->pins[U8X8_PIN_SPI_CLOCK])->PIO_CODR;
arduino_clock_mask = digitalPinToBitMask(u8x8->pins[U8X8_PIN_SPI_CLOCK]);
arduinoSetDataPort = &digitalPinToPort(u8x8->pins[U8X8_PIN_SPI_DATA])->PIO_SODR;
arduinoUnsetDataPort = &digitalPinToPort(u8x8->pins[U8X8_PIN_SPI_DATA])->PIO_CODR;
arduino_data_mask = digitalPinToBitMask(u8x8->pins[U8X8_PIN_SPI_DATA]);
break;
case U8X8_MSG_BYTE_END_TRANSFER:
u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->pre_chip_disable_wait_ns, NULL);
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_disable_level);
break;
default:
return 0;
}
return 1;
}
#else
/* fallback */
uint8_t u8x8_byte_arduino_4wire_sw_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
return u8x8_byte_4wire_sw_spi(u8x8, msg,arg_int, arg_ptr);
}
#endif
/*=============================================*/
/*=== 3 WIRE HARDWARE SPI with 8 bit HW SPI Subsystem ===*/
/*
references:
https://github.com/olikraus/ucglib/blob/master/cppsrc/Ucglib.cpp#L581
https://github.com/olikraus/u8g2/issues/1041
*/
static uint8_t arduino_hw_spi_3w_buffer[9];
static uint8_t arduino_hw_spi_3w_bytepos;
static uint16_t arduino_hw_spi_3w_dc; // 0 = dc==0, 256 = dc==1
static void arduino_hw_spi_3w_init()
{
memset(arduino_hw_spi_3w_buffer, 0, 9);
arduino_hw_spi_3w_bytepos = 0;
}
static void arduino_hw_spi_3w_flush(void)
{
#ifdef U8X8_HAVE_HW_SPI
uint8_t i;
for(i = 0; i <= arduino_hw_spi_3w_bytepos; i++)
{
SPI.transfer(arduino_hw_spi_3w_buffer[i]);
}
#endif
}
static void arduino_hw_spi_3w_sendbyte(uint8_t data)
{
static union { uint16_t val; struct { uint8_t lsb; uint8_t msb; }; } data16; // well well, not legal ISO 9899 code
data16.val = (arduino_hw_spi_3w_dc + data) << (7 - arduino_hw_spi_3w_bytepos);
#ifdef __BYTE_ORDER__
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
arduino_hw_spi_3w_buffer[arduino_hw_spi_3w_bytepos] |= data16.msb;
++arduino_hw_spi_3w_bytepos;
arduino_hw_spi_3w_buffer[arduino_hw_spi_3w_bytepos] |= data16.lsb;
#else
arduino_hw_spi_3w_buffer[arduino_hw_spi_3w_bytepos] |= data16.lsb;
++arduino_hw_spi_3w_bytepos;
arduino_hw_spi_3w_buffer[arduino_hw_spi_3w_bytepos] |= data16.msb;
#endif
#else // __BYTE_ORDER__ not defined (no gcc)
// assume little endian
arduino_hw_spi_3w_buffer[arduino_hw_spi_3w_bytepos] |= data16.msb;
++arduino_hw_spi_3w_bytepos;
arduino_hw_spi_3w_buffer[arduino_hw_spi_3w_bytepos] |= data16.lsb;
#endif
if (arduino_hw_spi_3w_bytepos == 8)
{
arduino_hw_spi_3w_flush();
arduino_hw_spi_3w_init();
}
}
extern "C" uint8_t u8x8_byte_arduino_3wire_hw_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
#ifdef U8X8_HAVE_HW_SPI
uint8_t *data;
uint8_t internal_spi_mode;
switch(msg)
{
case U8X8_MSG_BYTE_SEND:
data = (uint8_t *)arg_ptr;
while(arg_int > 0) {
arduino_hw_spi_3w_sendbyte((uint8_t)*data);
data++;
arg_int--;
}
break;
case U8X8_MSG_BYTE_INIT:
if ( u8x8->bus_clock == 0 ) /* issue 769 */
u8x8->bus_clock = u8x8->display_info->sck_clock_hz;
/* disable chipselect */
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_disable_level);
#if defined(ESP_PLATFORM) || defined(ARDUINO_ARCH_ESP32)
/* ESP32 has the following begin: SPI.begin(int8_t sck=SCK, int8_t miso=MISO, int8_t mosi=MOSI, int8_t ss=-1); */
/* not sure about ESP8266 */
/* apply bugfix from PR 2123 */
//if ( u8x8->pins[U8X8_PIN_I2C_CLOCK] != U8X8_PIN_NONE && u8x8->pins[U8X8_PIN_I2C_DATA] != U8X8_PIN_NONE )
if ( u8x8->pins[U8X8_PIN_SPI_CLOCK] != U8X8_PIN_NONE && u8x8->pins[U8X8_PIN_SPI_DATA] != U8X8_PIN_NONE )
{
/* SPI.begin(int8_t sck=SCK, int8_t miso=MISO, int8_t mosi=MOSI, int8_t ss=-1); */
/* actually MISO is not used, but what else could be used here??? */
//SPI.begin(u8x8->pins[U8X8_PIN_I2C_CLOCK], MISO, u8x8->pins[U8X8_PIN_I2C_DATA]);
SPI.begin(u8x8->pins[U8X8_PIN_SPI_CLOCK], MISO, u8x8->pins[U8X8_PIN_SPI_DATA]);
}
else
{
SPI.begin();
}
#else
SPI.begin();
#endif
break;
case U8X8_MSG_BYTE_SET_DC:
arduino_hw_spi_3w_dc = arg_int ? 256 : 0;
break;
case U8X8_MSG_BYTE_START_TRANSFER:
/* SPI mode has to be mapped to the mode of the current controller;
at least Uno, Due, 101 have different SPI_MODEx values */
internal_spi_mode = 0;
switch(u8x8->display_info->spi_mode) {
case 0: internal_spi_mode = SPI_MODE0; break;
case 1: internal_spi_mode = SPI_MODE1; break;
case 2: internal_spi_mode = SPI_MODE2; break;
case 3: internal_spi_mode = SPI_MODE3; break;
}
#if ARDUINO >= 10600
SPI.beginTransaction(
SPISettings(u8x8->bus_clock, MSBFIRST, internal_spi_mode));
#else
SPI.begin();
if (u8x8->display_info->sck_pulse_width_ns < 70)
SPI.setClockDivider(SPI_CLOCK_DIV2);
else if (u8x8->display_info->sck_pulse_width_ns < 140)
SPI.setClockDivider(SPI_CLOCK_DIV4);
else
SPI.setClockDivider(SPI_CLOCK_DIV8);
SPI.setDataMode(internal_spi_mode);
SPI.setBitOrder(MSBFIRST);
#endif
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_enable_level);
u8x8->gpio_and_delay_cb(
u8x8,
U8X8_MSG_DELAY_NANO,
u8x8->display_info->post_chip_enable_wait_ns,
NULL);
arduino_hw_spi_3w_init();
break;
case U8X8_MSG_BYTE_END_TRANSFER:
u8x8->gpio_and_delay_cb(
u8x8,
U8X8_MSG_DELAY_NANO,
u8x8->display_info->pre_chip_disable_wait_ns,
NULL);
if (arduino_hw_spi_3w_bytepos)
arduino_hw_spi_3w_flush();
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_disable_level);
#if ARDUINO >= 10600
SPI.endTransaction();
#else
SPI.end();
#endif
break;
default:
return 0;
}
#endif // U8X8_HAVE_HW_SPI
return 1;
}
/*=============================================*/
/*=== 4 WIRE HARDWARE SPI ===*/
#ifdef U8X8_USE_PINS
extern "C" uint8_t u8x8_byte_arduino_hw_spi(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
#ifdef U8X8_HAVE_HW_SPI
#if !defined(ESP_PLATFORM)
uint8_t *data;
#endif
uint8_t internal_spi_mode;
switch(msg)
{
case U8X8_MSG_BYTE_SEND:
#if defined(ESP_PLATFORM)
//T.M.L 2023-02-28: use the block transfer function on ESP, which does not overwrite the buffer.
SPI.writeBytes((uint8_t*)arg_ptr, arg_int);
#else
// 1.6.5 offers a block transfer, but the problem is, that the
// buffer is overwritten with the incoming data
// so it can not be used...
// SPI.transfer((uint8_t *)arg_ptr, arg_int);
data = (uint8_t *)arg_ptr;
while( arg_int > 0 )
{
SPI.transfer((uint8_t)*data);
data++;
arg_int--;
}
#endif
break;
case U8X8_MSG_BYTE_INIT:
if ( u8x8->bus_clock == 0 ) /* issue 769 */
u8x8->bus_clock = u8x8->display_info->sck_clock_hz;
/* disable chipselect */
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_disable_level);
/* no wait required here */
/* for SPI: setup correct level of the clock signal */
// removed, use SPI.begin() instead: pinMode(11, OUTPUT);
// removed, use SPI.begin() instead: pinMode(13, OUTPUT);
// removed, use SPI.begin() instead: digitalWrite(13, u8x8_GetSPIClockPhase(u8x8));
/* setup hardware with SPI.begin() instead of previous digitalWrite() and pinMode() calls */
/* issue #377 */
/* issue #378: removed ESP8266 support, which is implemented differently */
#if defined(ESP_PLATFORM) || defined(ARDUINO_ARCH_ESP32)
/* ESP32 has the following begin: SPI.begin(int8_t sck=SCK, int8_t miso=MISO, int8_t mosi=MOSI, int8_t ss=-1); */
/* not sure about ESP8266 */
if ( u8x8->pins[U8X8_PIN_SPI_CLOCK] != U8X8_PIN_NONE && u8x8->pins[U8X8_PIN_SPI_DATA] != U8X8_PIN_NONE )
{
/* SPI.begin(int8_t sck=SCK, int8_t miso=MISO, int8_t mosi=MOSI, int8_t ss=-1); */
/* actually MISO is not used, but what else could be used here??? */
SPI.begin(u8x8->pins[U8X8_PIN_SPI_CLOCK], MISO, u8x8->pins[U8X8_PIN_SPI_DATA]);
}
else
{
SPI.begin();
}
#else
SPI.begin();
#endif
break;
case U8X8_MSG_BYTE_SET_DC:
u8x8_gpio_SetDC(u8x8, arg_int);
break;
case U8X8_MSG_BYTE_START_TRANSFER:
/* SPI mode has to be mapped to the mode of the current controller, at least Uno, Due, 101 have different SPI_MODEx values */
internal_spi_mode = 0;
switch(u8x8->display_info->spi_mode)
{
case 0: internal_spi_mode = SPI_MODE0; break;
case 1: internal_spi_mode = SPI_MODE1; break;
case 2: internal_spi_mode = SPI_MODE2; break;
case 3: internal_spi_mode = SPI_MODE3; break;
}
#if ARDUINO >= 10600
SPI.beginTransaction(SPISettings(u8x8->bus_clock, MSBFIRST, internal_spi_mode));
#else
SPI.begin();
if ( u8x8->display_info->sck_pulse_width_ns < 70 )
SPI.setClockDivider( SPI_CLOCK_DIV2 );
else if ( u8x8->display_info->sck_pulse_width_ns < 140 )
SPI.setClockDivider( SPI_CLOCK_DIV4 );
else
SPI.setClockDivider( SPI_CLOCK_DIV8 );
SPI.setDataMode(internal_spi_mode);
SPI.setBitOrder(MSBFIRST);
#endif
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_enable_level);
u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->post_chip_enable_wait_ns, NULL);
break;
case U8X8_MSG_BYTE_END_TRANSFER:
u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->pre_chip_disable_wait_ns, NULL);
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_disable_level);
#if ARDUINO >= 10600
SPI.endTransaction();
#else
SPI.end();
#endif
break;
default: