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//*****************************************************************************
//
// osram96x16.c - Driver for the OSRAM 96x16 graphical OLED display.
//
// Copyright (c) 2006 Luminary Micro, Inc. All rights reserved.
//
// Software License Agreement
//
// Luminary Micro, Inc. (LMI) is supplying this software for use solely and
// exclusively on LMI's Stellaris Family of microcontroller products.
//
// The software is owned by LMI and/or its suppliers, and is protected under
// applicable copyright laws. All rights are reserved. Any use in violation
// of the foregoing restrictions may subject the user to criminal sanctions
// under applicable laws, as well as to civil liability for the breach of the
// terms and conditions of this license.
//
// THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
// OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
// LMI SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
// CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
//
// This is part of revision 816 of the Stellaris Driver Library.
//
//*****************************************************************************
//*****************************************************************************
//
//! \addtogroup ev_lm3s811_api
//! @{
//
//*****************************************************************************
#include "hw_i2c.h"
#include "hw_memmap.h"
#include "hw_sysctl.h"
#include "hw_types.h"
#include "src/debug.h"
#include "src/gpio.h"
#include "src/i2c.h"
#include "src/sysctl.h"
#include "osram96x16.h"
extern void I2CMasterInitExpClk(unsigned long ulBase, unsigned long ulI2CClk, tBoolean bFast);
//*****************************************************************************
//
// The I2C slave address of the SSD0303 controller on the OLED display.
//
//*****************************************************************************
#define SSD0303_ADDR 0x3d
//*****************************************************************************
//
// A 5x7 font (in a 6x8 cell, where the sixth column is omitted from this
// table) for displaying text on the OLED display. The data is organized as
// bytes from the left column to the right column, with each byte containing
// the top row in the LSB and the bottom row in the MSB.
//
//*****************************************************************************
static const unsigned char g_pucFont[95][5] =
{
{ 0x00, 0x00, 0x00, 0x00, 0x00 }, // " "
{ 0x00, 0x00, 0x4f, 0x00, 0x00 }, // !
{ 0x00, 0x07, 0x00, 0x07, 0x00 }, // "
{ 0x14, 0x7f, 0x14, 0x7f, 0x14 }, // #
{ 0x24, 0x2a, 0x7f, 0x2a, 0x12 }, // $
{ 0x23, 0x13, 0x08, 0x64, 0x62 }, // %
{ 0x36, 0x49, 0x55, 0x22, 0x50 }, // &
{ 0x00, 0x05, 0x03, 0x00, 0x00 }, // '
{ 0x00, 0x1c, 0x22, 0x41, 0x00 }, // (
{ 0x00, 0x41, 0x22, 0x1c, 0x00 }, // )
{ 0x14, 0x08, 0x3e, 0x08, 0x14 }, // *
{ 0x08, 0x08, 0x3e, 0x08, 0x08 }, // +
{ 0x00, 0x50, 0x30, 0x00, 0x00 }, // ,
{ 0x08, 0x08, 0x08, 0x08, 0x08 }, // -
{ 0x00, 0x60, 0x60, 0x00, 0x00 }, // .
{ 0x20, 0x10, 0x08, 0x04, 0x02 }, // /
{ 0x3e, 0x51, 0x49, 0x45, 0x3e }, // 0
{ 0x00, 0x42, 0x7f, 0x40, 0x00 }, // 1
{ 0x42, 0x61, 0x51, 0x49, 0x46 }, // 2
{ 0x21, 0x41, 0x45, 0x4b, 0x31 }, // 3
{ 0x18, 0x14, 0x12, 0x7f, 0x10 }, // 4
{ 0x27, 0x45, 0x45, 0x45, 0x39 }, // 5
{ 0x3c, 0x4a, 0x49, 0x49, 0x30 }, // 6
{ 0x01, 0x71, 0x09, 0x05, 0x03 }, // 7
{ 0x36, 0x49, 0x49, 0x49, 0x36 }, // 8
{ 0x06, 0x49, 0x49, 0x29, 0x1e }, // 9
{ 0x00, 0x36, 0x36, 0x00, 0x00 }, // :
{ 0x00, 0x56, 0x36, 0x00, 0x00 }, // ;
{ 0x08, 0x14, 0x22, 0x41, 0x00 }, // <
{ 0x14, 0x14, 0x14, 0x14, 0x14 }, // =
{ 0x00, 0x41, 0x22, 0x14, 0x08 }, // >
{ 0x02, 0x01, 0x51, 0x09, 0x06 }, // ?
{ 0x32, 0x49, 0x79, 0x41, 0x3e }, // @
{ 0x7e, 0x11, 0x11, 0x11, 0x7e }, // A
{ 0x7f, 0x49, 0x49, 0x49, 0x36 }, // B
{ 0x3e, 0x41, 0x41, 0x41, 0x22 }, // C
{ 0x7f, 0x41, 0x41, 0x22, 0x1c }, // D
{ 0x7f, 0x49, 0x49, 0x49, 0x41 }, // E
{ 0x7f, 0x09, 0x09, 0x09, 0x01 }, // F
{ 0x3e, 0x41, 0x49, 0x49, 0x7a }, // G
{ 0x7f, 0x08, 0x08, 0x08, 0x7f }, // H
{ 0x00, 0x41, 0x7f, 0x41, 0x00 }, // I
{ 0x20, 0x40, 0x41, 0x3f, 0x01 }, // J
{ 0x7f, 0x08, 0x14, 0x22, 0x41 }, // K
{ 0x7f, 0x40, 0x40, 0x40, 0x40 }, // L
{ 0x7f, 0x02, 0x0c, 0x02, 0x7f }, // M
{ 0x7f, 0x04, 0x08, 0x10, 0x7f }, // N
{ 0x3e, 0x41, 0x41, 0x41, 0x3e }, // O
{ 0x7f, 0x09, 0x09, 0x09, 0x06 }, // P
{ 0x3e, 0x41, 0x51, 0x21, 0x5e }, // Q
{ 0x7f, 0x09, 0x19, 0x29, 0x46 }, // R
{ 0x46, 0x49, 0x49, 0x49, 0x31 }, // S
{ 0x01, 0x01, 0x7f, 0x01, 0x01 }, // T
{ 0x3f, 0x40, 0x40, 0x40, 0x3f }, // U
{ 0x1f, 0x20, 0x40, 0x20, 0x1f }, // V
{ 0x3f, 0x40, 0x38, 0x40, 0x3f }, // W
{ 0x63, 0x14, 0x08, 0x14, 0x63 }, // X
{ 0x07, 0x08, 0x70, 0x08, 0x07 }, // Y
{ 0x61, 0x51, 0x49, 0x45, 0x43 }, // Z
{ 0x00, 0x7f, 0x41, 0x41, 0x00 }, // [
{ 0x02, 0x04, 0x08, 0x10, 0x20 }, // "\"
{ 0x00, 0x41, 0x41, 0x7f, 0x00 }, // ]
{ 0x04, 0x02, 0x01, 0x02, 0x04 }, // ^
{ 0x40, 0x40, 0x40, 0x40, 0x40 }, // _
{ 0x00, 0x01, 0x02, 0x04, 0x00 }, // `
{ 0x20, 0x54, 0x54, 0x54, 0x78 }, // a
{ 0x7f, 0x48, 0x44, 0x44, 0x38 }, // b
{ 0x38, 0x44, 0x44, 0x44, 0x20 }, // c
{ 0x38, 0x44, 0x44, 0x48, 0x7f }, // d
{ 0x38, 0x54, 0x54, 0x54, 0x18 }, // e
{ 0x08, 0x7e, 0x09, 0x01, 0x02 }, // f
{ 0x0c, 0x52, 0x52, 0x52, 0x3e }, // g
{ 0x7f, 0x08, 0x04, 0x04, 0x78 }, // h
{ 0x00, 0x44, 0x7d, 0x40, 0x00 }, // i
{ 0x20, 0x40, 0x44, 0x3d, 0x00 }, // j
{ 0x7f, 0x10, 0x28, 0x44, 0x00 }, // k
{ 0x00, 0x41, 0x7f, 0x40, 0x00 }, // l
{ 0x7c, 0x04, 0x18, 0x04, 0x78 }, // m
{ 0x7c, 0x08, 0x04, 0x04, 0x78 }, // n
{ 0x38, 0x44, 0x44, 0x44, 0x38 }, // o
{ 0x7c, 0x14, 0x14, 0x14, 0x08 }, // p
{ 0x08, 0x14, 0x14, 0x18, 0x7c }, // q
{ 0x7c, 0x08, 0x04, 0x04, 0x08 }, // r
{ 0x48, 0x54, 0x54, 0x54, 0x20 }, // s
{ 0x04, 0x3f, 0x44, 0x40, 0x20 }, // t
{ 0x3c, 0x40, 0x40, 0x20, 0x7c }, // u
{ 0x1c, 0x20, 0x40, 0x20, 0x1c }, // v
{ 0x3c, 0x40, 0x30, 0x40, 0x3c }, // w
{ 0x44, 0x28, 0x10, 0x28, 0x44 }, // x
{ 0x0c, 0x50, 0x50, 0x50, 0x3c }, // y
{ 0x44, 0x64, 0x54, 0x4c, 0x44 }, // z
{ 0x00, 0x08, 0x36, 0x41, 0x00 }, // {
{ 0x00, 0x00, 0x7f, 0x00, 0x00 }, // |
{ 0x00, 0x41, 0x36, 0x08, 0x00 }, // }
{ 0x02, 0x01, 0x02, 0x04, 0x02 }, // ~
};
//*****************************************************************************
//
// The sequence of commands used to initialize the SSD0303 controller. Each
// command is described as follows: there is a byte specifying the number of
// bytes in the I2C transfer, followed by that many bytes of command data.
//
//*****************************************************************************
static const unsigned char g_pucOSRAMInit[] =
{
//
// Turn off the panel
//
0x02, 0x80, 0xae,
//
// Set lower column address
//
0x02, 0x80, 0x04,
//
// Set higher column address
//
0x02, 0x80, 0x12,
//
// Set contrast control register
//
0x04, 0x80, 0x81, 0x80, 0x2b,
//
// Set segment re-map
//
0x02, 0x80, 0xa1,
//
// Set display start line
//
0x02, 0x80, 0x40,
//
// Set display offset
//
0x04, 0x80, 0xd3, 0x80, 0x00,
//
// Set multiplex ratio
//
0x04, 0x80, 0xa8, 0x80, 0x0f,
//
// Set the display to normal mode
//
0x02, 0x80, 0xa4,
//
// Non-inverted display
//
0x02, 0x80, 0xa6,
//
// Set the page address
//
0x02, 0x80, 0xb0,
//
// Set COM output scan direction
//
0x02, 0x80, 0xc8,
//
// Set display clock divide ratio/oscillator frequency
//
0x04, 0x80, 0xd5, 0x80, 0x72,
//
// Enable mono mode
//
0x04, 0x80, 0xd8, 0x80, 0x00,
//
// Set pre-charge period
//
0x04, 0x80, 0xd9, 0x80, 0x22,
//
// Set COM pins hardware configuration
//
0x04, 0x80, 0xda, 0x80, 0x12,
//
// Set VCOM deslect level
//
0x04, 0x80, 0xdb, 0x80, 0x0f,
//
// Set DC-DC on
//
0x04, 0x80, 0xad, 0x80, 0x8b,
//
// Turn on the panel
//
0x02, 0x80, 0xaf,
};
//*****************************************************************************
//
// The inter-byte delay required by the SSD0303 OLED controller.
//
//*****************************************************************************
static unsigned long g_ulDelay;
//*****************************************************************************
//
//! \internal
//!
//! Provide a small delay.
//!
//! \param ulCount is the number of delay loop iterations to perform.
//!
//! Since the SSD0303 controller needs a delay between bytes written to it over
//! the I2C bus, this function provides a means of generating that delay. It
//! is written in assembly to keep the delay consistent across tool chains,
//! avoiding the need to tune the delay based on the tool chain in use.
//!
//! \return None.
//
//*****************************************************************************
#if defined(ewarm)
static void
OSRAMDelay(unsigned long ulCount)
{
__asm(" subs r0, #1\n"
" bne OSRAMDelay\n"
" bx lr");
}
#endif
#if defined(gcc)
static void __attribute__((naked))
OSRAMDelay(unsigned long ulCount)
{
__asm(" subs r0, #1\n"
" bne OSRAMDelay\n"
" bx lr");
}
#endif
#if defined(rvmdk) || defined(__ARMCC_VERSION)
__asm void
OSRAMDelay(unsigned long ulCount)
{
subs r0, #1;
bne OSRAMDelay;
bx lr;
}
#endif
//*****************************************************************************
//
//! \internal
//!
//! Start a transfer to the SSD0303 controller.
//!
//! \param ucChar is the first byte to be written to the controller.
//!
//! This function will start a transfer to the SSD0303 controller via the I2C
//! bus.
//!
//! The data is written in a polled fashion; this function will not return
//! until the byte has been written to the controller.
//!
//! \return None.
//
//*****************************************************************************
static void
OSRAMWriteFirst(unsigned char ucChar)
{
//
// Set the slave address.
//
I2CMasterSlaveAddrSet(I2C_MASTER_BASE, SSD0303_ADDR, false);
//
// Write the first byte to the controller.
//
I2CMasterDataPut(I2C_MASTER_BASE, ucChar);
//
// Start the transfer.
//
I2CMasterControl(I2C_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_START);
}
//*****************************************************************************
//
//! \internal
//!
//! Write a byte to the SSD0303 controller.
//!
//! \param ucChar is the byte to be transmitted to the controller.
//!
//! This function continues a transfer to the SSD0303 controller by writing
//! another byte over the I2C bus. This must only be called after calling
//! OSRAMWriteFirst(), but before calling OSRAMWriteFinal().
//!
//! The data is written in a polled faashion; this function will not return
//! until the byte has been written to the controller.
//!
//! \return None.
//
//*****************************************************************************
static void
OSRAMWriteByte(unsigned char ucChar)
{
//
// Wait until the current byte has been transferred.
//
while(I2CMasterIntStatus(I2C_MASTER_BASE, false) == 0)
{
}
//
// Provide the required inter-byte delay.
//
OSRAMDelay(g_ulDelay);
//
// Write the next byte to the controller.
//
I2CMasterDataPut(I2C_MASTER_BASE, ucChar);
//
// Continue the transfer.
//
I2CMasterControl(I2C_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
}
//*****************************************************************************
//
//! \internal
//!
//! Write a sequence of bytes to the SSD0303 controller.
//!
//! This function continues a transfer to the SSD0303 controller by writing a
//! sequence of bytes over the I2C bus. This must only be called after calling
//! OSRAMWriteFirst(), but before calling OSRAMWriteFinal().
//!
//! The data is written in a polled fashion; this function will not return
//! until the entire byte sequence has been written to the controller.
//!
//! \return None.
//
//*****************************************************************************
static void
OSRAMWriteArray(const unsigned char *pucBuffer, unsigned long ulCount)
{
//
// Loop while there are more bytes left to be transferred.
//
while(ulCount != 0)
{
//
// Wait until the current byte has been transferred.
//
while(I2CMasterIntStatus(I2C_MASTER_BASE, false) == 0)
{
}
//
// Provide the required inter-byte delay.
//
OSRAMDelay(g_ulDelay);
//
// Write the next byte to the controller.
//
I2CMasterDataPut(I2C_MASTER_BASE, *pucBuffer++);
ulCount--;
//
// Continue the transfer.
//
I2CMasterControl(I2C_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);
}
}
//*****************************************************************************
//
//! \internal
//!
//! Finish a transfer to the SSD0303 controller.
//!
//! \param ucChar is the final byte to be written to the controller.
//!
//! This function will finish a transfer to the SSD0303 controller via the I2C
//! bus. This must only be called after calling OSRAMWriteFirst().
//!
//! The data is written in a polled fashion; this function will not return
//! until the byte has been written to the controller.
//!
//! \return None.
//
//*****************************************************************************
static void
OSRAMWriteFinal(unsigned char ucChar)
{
//
// Wait until the current byte has been transferred.
//
while(I2CMasterIntStatus(I2C_MASTER_BASE, false) == 0)
{
}
//
// Provide the required inter-byte delay.
//
OSRAMDelay(g_ulDelay);
//
// Write the final byte to the controller.
//
I2CMasterDataPut(I2C_MASTER_BASE, ucChar);
//
// Finish the transfer.
//
I2CMasterControl(I2C_MASTER_BASE, I2C_MASTER_CMD_BURST_SEND_FINISH);
//
// Wait until the final byte has been transferred.
//
while(I2CMasterIntStatus(I2C_MASTER_BASE, false) == 0)
{
}
//
// Provide the required inter-byte delay.
//
OSRAMDelay(g_ulDelay);
}
//*****************************************************************************
//
//! Clears the OLED display.
//!
//! This function will clear the display. All pixels in the display will be
//! turned off.
//!
//! \return None.
//
//*****************************************************************************
void
OSRAMClear(void)
{
static const unsigned char pucRow1[] =
{
0xb0, 0x80, 0x04, 0x80, 0x12, 0x40
};
static const unsigned char pucRow2[] =
{
0xb1, 0x80, 0x04, 0x80, 0x12, 0x40
};
unsigned long ulIdx;
//
// Move the display cursor to the first column of the first row.
//
OSRAMWriteFirst(0x80);
OSRAMWriteArray(pucRow1, sizeof(pucRow1));
//
// Fill this row with zeros.
//
for(ulIdx = 0; ulIdx < 95; ulIdx++)
{
OSRAMWriteByte(0x00);
}
OSRAMWriteFinal(0x00);
//
// Move the display cursor to the first column of the second row.
//
OSRAMWriteFirst(0x80);
OSRAMWriteArray(pucRow2, sizeof(pucRow2));
//
// Fill this row with zeros.
//
for(ulIdx = 0; ulIdx < 95; ulIdx++)
{
OSRAMWriteByte(0x00);
}
OSRAMWriteFinal(0x00);
}
//*****************************************************************************
//
//! Displays a string on the OLED display.
//!
//! \param pcStr is a pointer to the string to display.
//! \param ulX is the horizontal position to display the string, specified in
//! columns from the left edge of the display.
//! \param ulY is the vertical position to display the string, specified in
//! eight scan line blocks from the top of the display (i.e. only 0 and 1 are
//! valid).
//!
//! This function will draw a string on the display. Only the ASCII characters
//! between 32 (space) and 126 (tilde) are supported; other characters will
//! result in random data being draw on the display (based on whatever appears
//! before/after the font in memory). The font is mono-spaced, so characters
//! such as "i" and "l" have more white space around them than characters such
//! as "m" or "w".
//!
//! If the drawing of the string reaches the right edge of the display, no more
//! characters will be drawn. Therefore, special care is not required to avoid
//! supplying a string that is "too long" to display.
//!
//! \return None.
//
//*****************************************************************************
void
OSRAMStringDraw(const char *pcStr, unsigned long ulX, unsigned long ulY)
{
//
// Check the arguments.
//
ASSERT(ulX < 96);
ASSERT(ulY < 2);
//
// Move the display cursor to the requested position on the display.
//
OSRAMWriteFirst(0x80);
OSRAMWriteByte((ulY == 0) ? 0xb0 : 0xb1);
OSRAMWriteByte(0x80);
OSRAMWriteByte((ulX + 36) & 0x0f);
OSRAMWriteByte(0x80);
OSRAMWriteByte(0x10 | (((ulX + 36) >> 4) & 0x0f));
OSRAMWriteByte(0x40);
//
// Loop while there are more characters in the string.
//
while(*pcStr != 0)
{
//
// See if there is enough space on the display for this entire
// character.
//
if(ulX <= 90)
{
//
// Write the contents of this character to the display.
//
OSRAMWriteArray(g_pucFont[*pcStr - ' '], 5);
//
// See if this is the last character to display (either because the
// right edge has been reached or because there are no more
// characters).
//
if((ulX == 90) || (pcStr[1] == 0))
{
//
// Write the final column of the display.
//
OSRAMWriteFinal(0x00);
//
// The string has been displayed.
//
return;
}
//
// Write the inter-character padding column.
//
OSRAMWriteByte(0x00);
}
else
{
//
// Write the portion of the character that will fit onto the
// display.
//
OSRAMWriteArray(g_pucFont[*pcStr - ' '], 95 - ulX);
OSRAMWriteFinal(g_pucFont[*pcStr - ' '][95 - ulX]);
//
// The string has been displayed.
//
return;
}
//
// Advance to the next character.
//
pcStr++;
//
// Increment the X coordinate by the six columns that were just
// written.
//
ulX += 6;
}
}
//*****************************************************************************
//
//! Displays an image on the OLED display.
//!
//! \param pucImage is a pointer to the image data.
//! \param ulX is the horizontal position to display this image, specified in
//! columns from the left edge of the display.
//! \param ulY is the vertical position to display this image, specified in
//! eight scan line blocks from the top of the display (i.e. only 0 and 1 are
//! valid).
//! \param ulWidth is the width of the image, specified in columns.
//! \param ulHeight is the height of the image, specified in eight row blocks
//! (i.e. only 1 and 2 are valid).
//!
//! This function will display a bitmap graphic on the display. The image to
//! be displayed must be a multiple of eight scan lines high (i.e. one row) and
//! will be drawn at a vertical position that is a multiple of eight scan lines
//! (i.e. scan line zero or scan line eight, corresponding to row zero or row
//! one).
//!
//! The image data is organized with the first row of image data appearing left
//! to right, followed immediately by the second row of image data. Each byte
//! contains the data for the eight scan lines of the column, with the top scan
//! line being in the least significant bit of the byte and the bottom scan
//! line being in the most significant bit of the byte.
//!
//! For example, an image four columns wide and sixteen scan lines tall would
//! be arranged as follows (showing how the eight bytes of the image would
//! appear on the display):
//!
//! \verbatim
//! +-------+ +-------+ +-------+ +-------+
//! | | 0 | | | 0 | | | 0 | | | 0 |
//! | B | 1 | | B | 1 | | B | 1 | | B | 1 |
//! | y | 2 | | y | 2 | | y | 2 | | y | 2 |
//! | t | 3 | | t | 3 | | t | 3 | | t | 3 |
//! | e | 4 | | e | 4 | | e | 4 | | e | 4 |
//! | | 5 | | | 5 | | | 5 | | | 5 |
//! | 0 | 6 | | 1 | 6 | | 2 | 6 | | 3 | 6 |
//! | | 7 | | | 7 | | | 7 | | | 7 |
//! +-------+ +-------+ +-------+ +-------+
//!
//! +-------+ +-------+ +-------+ +-------+
//! | | 0 | | | 0 | | | 0 | | | 0 |
//! | B | 1 | | B | 1 | | B | 1 | | B | 1 |
//! | y | 2 | | y | 2 | | y | 2 | | y | 2 |
//! | t | 3 | | t | 3 | | t | 3 | | t | 3 |
//! | e | 4 | | e | 4 | | e | 4 | | e | 4 |
//! | | 5 | | | 5 | | | 5 | | | 5 |
//! | 4 | 6 | | 5 | 6 | | 6 | 6 | | 7 | 6 |
//! | | 7 | | | 7 | | | 7 | | | 7 |
//! +-------+ +-------+ +-------+ +-------+
//! \endverbatim
//!
//! \return None.
//
//*****************************************************************************
void
OSRAMImageDraw(const unsigned char *pucImage, unsigned long ulX,
unsigned long ulY, unsigned long ulWidth,
unsigned long ulHeight)
{
//
// Check the arguments.
//
ASSERT(ulX < 96);
ASSERT(ulY < 2);
ASSERT((ulX + ulWidth) <= 96);
ASSERT((ulY + ulHeight) <= 2);
//
// The first 36 columns of the LCD buffer are not displayed, so increment
// the X coorddinate by 36 to account for the non-displayed frame buffer
// memory.
//
ulX += 36;
//
// Loop while there are more rows to display.
//
while(ulHeight--)
{
//
// Write the starting address within this row.
//
OSRAMWriteFirst(0x80);
OSRAMWriteByte((ulY == 0) ? 0xb0 : 0xb1);
OSRAMWriteByte(0x80);
OSRAMWriteByte(ulX & 0x0f);
OSRAMWriteByte(0x80);
OSRAMWriteByte(0x10 | ((ulX >> 4) & 0x0f));
OSRAMWriteByte(0x40);
//
// Write this row of image data.
//
OSRAMWriteArray(pucImage, ulWidth - 1);
OSRAMWriteFinal(pucImage[ulWidth - 1]);
//
// Advance to the next row of the image.
//
pucImage += ulWidth;
ulY++;
}
}
//*****************************************************************************
//
//! Initialize the OLED display.
//!
//! \param bFast is a boolean that is \e true if the I2C interface should be
//! run at 400 kbps and \e false if it should be run at 100 kbps.
//!
//! This function initializes the I2C interface to the OLED display and
//! configures the SSD0303 controller on the panel.
//!
//! \return None.
//
//*****************************************************************************
void
OSRAMInit(tBoolean bFast)
{
unsigned long ulIdx;
//
// Enable the I2C and GPIO port B blocks as they are needed by this driver.
//
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
//
// Configure the I2C SCL and SDA pins for I2C operation.
//
GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_2 | GPIO_PIN_3);
//
// Initialize the I2C master.
//
I2CMasterInitExpClk(I2C_MASTER_BASE, SysCtlClockGet(), bFast);
//
// Compute the inter-byte delay for the SSD0303 controller. This delay is
// dependent upon the I2C bus clock rate; the slower the clock the longer
// the delay required.
//
// The derivation of this formula is based on a measured delay of
// OSRAMDelay(1700) for a 100 kHz I2C bus with the CPU running at 50 MHz
// (referred to as C). To scale this to the delay for a different CPU
// speed (since this is just a CPU-based delay loop) is:
//
// f(CPU)
// C * ----------
// 50,000,000
//
// To then scale this to the actual I2C rate (since it won't always be
// precisely 100 kHz):
//
// f(CPU) 100,000
// C * ---------- * -------
// 50,000,000 f(I2C)
//
// This equation will give the inter-byte delay required for any
// configuration of the I2C master. But, as arranged it is impossible to
// directly compute in 32-bit arithmetic (without loosing a lot of
// accuracy). So, the equation is simplified.
//
// Since f(I2C) is generated by dividing down from f(CPU), replace it with
// the equivalent (where TPR is the value programmed into the Master Timer
// Period Register of the I2C master, with the 1 added back):
//
// 100,000
// f(CPU) -------
// C * ---------- * f(CPU)
// 50,000,000 ------------
// 2 * 10 * TPR
//
// Inverting the dividend in the last term:
//
// f(CPU) 100,000 * 2 * 10 * TPR
// C * ---------- * ----------------------
// 50,000,000 f(CPU)
//
// The f(CPU) now cancels out.
//
// 100,000 * 2 * 10 * TPR
// C * ----------------------
// 50,000,000
//
// Since there are no clock frequencies left in the equation, this equation
// also works for 400 kHz bus operation as well, since the 100,000 in the
// numerator becomes 400,000 but C is 1/4, which cancel out each other.
// Reducing the constants gives:
//
// TPR TPR TPR
// C * --- = 1700 * --- = 340 * ---
// 25 25 5
//
// Note that the constant C is actually a bit larger than it needs to be in
// order to provide some safety margin.
//
// When the panel is being initialized, the value of C actually needs to be
// a bit longer (3200 instead of 1700). So, set the larger value for now.
//
g_ulDelay = (640 * (HWREG(I2C_MASTER_BASE + I2C_MASTER_O_TPR) + 1)) / 5;
//
// Initialize the SSD0303 controller. Loop through the initialization
// sequence doing a single I2C transfer for each command.
//
for(ulIdx = 0; ulIdx < sizeof(g_pucOSRAMInit);
ulIdx += g_pucOSRAMInit[ulIdx] + 1)
{
//
// Send this command.
//
OSRAMWriteFirst(g_pucOSRAMInit[ulIdx + 1]);
OSRAMWriteArray(g_pucOSRAMInit + ulIdx + 2, g_pucOSRAMInit[ulIdx] - 2);
OSRAMWriteFinal(g_pucOSRAMInit[ulIdx + g_pucOSRAMInit[ulIdx]]);
}
//
// Now, switch to the actual value of C.
//
g_ulDelay = (340 * (HWREG(I2C_MASTER_BASE + I2C_MASTER_O_TPR) + 1)) / 5;
//
// Clear the frame buffer.
//
OSRAMClear();
}
//*****************************************************************************
//
//! Turns on the OLED display.
//!
//! This function will turn on the OLED display, causing it to display the
//! contents of its internal frame buffer.
//!
//! \return None.
//
//*****************************************************************************
void
OSRAMDisplayOn(void)
{
//
// Turn on the DC-DC converter and the display.
//
OSRAMWriteFirst(0x80);
OSRAMWriteByte(0xad);
OSRAMWriteByte(0x80);
OSRAMWriteByte(0x8b);
OSRAMWriteByte(0x80);
OSRAMWriteFinal(0xaf);
}
//*****************************************************************************
//
//! Turns off the OLED display.
//!
//! This function will turn off the OLED display. This will stop the scanning
//! of the panel and turn off the on-chip DC-DC converter, preventing damage to
//! the panel due to burn-in (it has similar characters to a CRT in this
//! respect).
//!
//! \return None.
//
//*****************************************************************************
void
OSRAMDisplayOff(void)
{
//
// Turn off the DC-DC converter and the display.
//
OSRAMWriteFirst(0x80);
OSRAMWriteByte(0xad);
OSRAMWriteByte(0x80);
OSRAMWriteByte(0x8a);
OSRAMWriteByte(0x80);
OSRAMWriteFinal(0xae);
}
//*****************************************************************************
//
// Close the Doxygen group.
//! @}
//
//*****************************************************************************