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newfile.c
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#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <ctype.h>
#include <stdint.h>
#include <stdbool.h>
#include <xc.h>
#define FOSC (32000000ULL)
#define FCY (FOSC/2)
#include <libpic30.h>
/////////////////////////////////////////////////////////////////////////
//
// I2C Routines
//
#define I2C1_SCL_TRIS TRISBbits.TRISB8
#define I2C1_SDA_TRIS TRISBbits.TRISB9
#define I2C1_SCL_LAT LATBbits.LATB8
#define I2C1_SDA_LAT LATBbits.LATB9
#define kI2C_100KHZ (0x00)
#define kI2C_400KHZ (0x02)
void i2c1Enable( uint8_t flags )
{
// Calculate BGP from FCY
// brg = ( FCY/FSCL - FCY/10000000) - 1
uint32_t fscl = ( flags & kI2C_400KHZ ) ? 400000UL : 100000UL;
uint16_t brg = ( ( FCY / fscl ) - ( FCY / 1000000 ) ) - 1;
I2C1BRG = brg;
// enable I2C module
I2C1CONbits.I2CEN = 1;
}
void i2c1Disable()
{
I2C1CONbits.I2CEN = 0;
}
static int16_t i2c1XferInt(
uint8_t address,
uint8_t* wdata, int wsize,
uint8_t* rdata, int rsize )
{
int16_t count = 0;
bool hasWrite = ( wdata != NULL ) && ( wsize != 0 );
bool hasRead = ( rdata != NULL ) && ( rsize != 0 );
if ( ! ( hasWrite || hasRead ) ) return -1;
// clear bus collision
I2C1STATbits.BCL = 0;
// generate start condition
I2C1CONbits.SEN = 1;
while ( 1 ) {
if ( I2C1STATbits.BCL ) return -2;
if ( ! I2C1CONbits.SEN ) break;
}
// Send 7-bit slave address and Read/Write flag
I2C1TRN = ( address << 1 ) | ( hasWrite ? 0x00 : 0x01 );
while ( 1 ) {
if ( I2C1STATbits.BCL ) return -3;
if ( ! I2C1STATbits.TRSTAT ) break;
}
if ( I2C1STATbits.ACKSTAT ) return -4;
// Write data
for ( int i = 0; i < wsize; i++ ) {
I2C1TRN = wdata[ i ];
while ( 1 ) {
if ( I2C1STATbits.BCL ) return -5;
if ( ! I2C1STATbits.TRSTAT ) break;
}
if ( I2C1STATbits.ACKSTAT ) return -6;
}
if ( hasRead ) {
// if we've been writing, send a Repeated Start
if ( hasWrite ) {
// generate start condition
I2C1CONbits.RSEN = 1;
while ( 1 ) {
if ( I2C1STATbits.BCL ) return -7;
if ( ! I2C1CONbits.RSEN ) break;
}
// Send 7-bit slave address with Read flag
I2C1TRN = ( address << 1 ) | 0x01;
while ( 1 ) {
if ( I2C1STATbits.BCL ) return -8;
if ( ! I2C1STATbits.TRSTAT ) break;
}
if ( I2C1STATbits.ACKSTAT ) return -9;
}
// Read data
for ( int i = 0; i < rsize; i++ ) {
// check idle
if ( I2C1CON & 0x1F ) return -10;
// enable reception
I2C1CONbits.RCEN = 1;
while ( 1 ) {
if ( I2C1STATbits.BCL ) return -11;
if ( ! I2C1CONbits.RCEN ) break;
}
// read data byte from buffer
rdata[ i ] = I2C1RCV;
count++;
// send acknowledge (or not acknowledge for final byte)
I2C1CONbits.ACKDT = i == ( rsize - 1 ) ? 1 : 0;
I2C1CONbits.ACKEN = 1;
while ( 1 ) {
if ( I2C1STATbits.BCL ) return -12;
if ( ! I2C1CONbits.ACKEN ) break;
}
}
}
// Generate stop condition
I2C1CONbits.PEN = 1;
while ( 1 ) {
if ( I2C1STATbits.BCL ) return -13;
if ( ! I2C1CONbits.PEN ) break;
}
return count;
}
int16_t i2c1Xfer(
uint8_t address,
uint8_t* wdata, int wsize,
uint8_t* rdata, int rsize )
{
int16_t result = i2c1XferInt( address, wdata, wsize, rdata, rsize );
if ( result < 0 ) {
// clear bus collision
I2C1STATbits.BCL = 0;
// clear start condition
if ( I2C1STATbits.S )
I2C1CONbits.PEN = 1;
}
return result;
}
void i2c1Reset()
{
// first make sure I2C module is disabled
i2c1Disable();
// hold SCL low for 100 ms to reset I2C bus
I2C1_SCL_TRIS = 0;
I2C1_SCL_LAT = 0;
for ( int i = 0; i < 10; i++ )
__delay_ms( 10 );
// tri-date SCL and SDA
I2C1_SCL_TRIS = 1;
I2C1_SDA_TRIS = 1;
__delay_ms( 10 );
}
/////////////////////////////////////////////////////////////////////////
//
// SSD1308 OLED Routines
//
#define SSD1308_Address 0x3c
#define SSD1308_Command_Mode 0x80
#define SSD1308_Data_Mode 0x40
#define SSD1308_Display_Off_Cmd 0xAE
#define SSD1308_Display_On_Cmd 0xAF
#define SSD1308_Normal_Display_Cmd 0xA6
#define SSD1308_Inverse_Display_Cmd 0xA7
#define SSD1308_Activate_Scroll_Cmd 0x2F
#define SSD1308_Dectivate_Scroll_Cmd 0x2E
#define SSD1308_Set_Brightness_Cmd 0x81
const uint8_t OledFont[][8] =
{
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
{0x00,0x00,0x5F,0x00,0x00,0x00,0x00,0x00},
{0x00,0x00,0x07,0x00,0x07,0x00,0x00,0x00},
{0x00,0x14,0x7F,0x14,0x7F,0x14,0x00,0x00},
{0x00,0x24,0x2A,0x7F,0x2A,0x12,0x00,0x00},
{0x00,0x23,0x13,0x08,0x64,0x62,0x00,0x00},
{0x00,0x36,0x49,0x55,0x22,0x50,0x00,0x00},
{0x00,0x00,0x05,0x03,0x00,0x00,0x00,0x00},
{0x00,0x1C,0x22,0x41,0x00,0x00,0x00,0x00},
{0x00,0x41,0x22,0x1C,0x00,0x00,0x00,0x00},
{0x00,0x08,0x2A,0x1C,0x2A,0x08,0x00,0x00},
{0x00,0x08,0x08,0x3E,0x08,0x08,0x00,0x00},
{0x00,0xA0,0x60,0x00,0x00,0x00,0x00,0x00},
{0x00,0x08,0x08,0x08,0x08,0x08,0x00,0x00},
{0x00,0x60,0x60,0x00,0x00,0x00,0x00,0x00},
{0x00,0x20,0x10,0x08,0x04,0x02,0x00,0x00},
{0x00,0x3E,0x51,0x49,0x45,0x3E,0x00,0x00},
{0x00,0x00,0x42,0x7F,0x40,0x00,0x00,0x00},
{0x00,0x62,0x51,0x49,0x49,0x46,0x00,0x00},
{0x00,0x22,0x41,0x49,0x49,0x36,0x00,0x00},
{0x00,0x18,0x14,0x12,0x7F,0x10,0x00,0x00},
{0x00,0x27,0x45,0x45,0x45,0x39,0x00,0x00},
{0x00,0x3C,0x4A,0x49,0x49,0x30,0x00,0x00},
{0x00,0x01,0x71,0x09,0x05,0x03,0x00,0x00},
{0x00,0x36,0x49,0x49,0x49,0x36,0x00,0x00},
{0x00,0x06,0x49,0x49,0x29,0x1E,0x00,0x00},
{0x00,0x00,0x36,0x36,0x00,0x00,0x00,0x00},
{0x00,0x00,0xAC,0x6C,0x00,0x00,0x00,0x00},
{0x00,0x08,0x14,0x22,0x41,0x00,0x00,0x00},
{0x00,0x14,0x14,0x14,0x14,0x14,0x00,0x00},
{0x00,0x41,0x22,0x14,0x08,0x00,0x00,0x00},
{0x00,0x02,0x01,0x51,0x09,0x06,0x00,0x00},
{0x00,0x32,0x49,0x79,0x41,0x3E,0x00,0x00},
{0x00,0x7E,0x09,0x09,0x09,0x7E,0x00,0x00},
{0x00,0x7F,0x49,0x49,0x49,0x36,0x00,0x00},
{0x00,0x3E,0x41,0x41,0x41,0x22,0x00,0x00},
{0x00,0x7F,0x41,0x41,0x22,0x1C,0x00,0x00},
{0x00,0x7F,0x49,0x49,0x49,0x41,0x00,0x00},
{0x00,0x7F,0x09,0x09,0x09,0x01,0x00,0x00},
{0x00,0x3E,0x41,0x41,0x51,0x72,0x00,0x00},
{0x00,0x7F,0x08,0x08,0x08,0x7F,0x00,0x00},
{0x00,0x41,0x7F,0x41,0x00,0x00,0x00,0x00},
{0x00,0x20,0x40,0x41,0x3F,0x01,0x00,0x00},
{0x00,0x7F,0x08,0x14,0x22,0x41,0x00,0x00},
{0x00,0x7F,0x40,0x40,0x40,0x40,0x00,0x00},
{0x00,0x7F,0x02,0x0C,0x02,0x7F,0x00,0x00},
{0x00,0x7F,0x04,0x08,0x10,0x7F,0x00,0x00},
{0x00,0x3E,0x41,0x41,0x41,0x3E,0x00,0x00},
{0x00,0x7F,0x09,0x09,0x09,0x06,0x00,0x00},
{0x00,0x3E,0x41,0x51,0x21,0x5E,0x00,0x00},
{0x00,0x7F,0x09,0x19,0x29,0x46,0x00,0x00},
{0x00,0x26,0x49,0x49,0x49,0x32,0x00,0x00},
{0x00,0x01,0x01,0x7F,0x01,0x01,0x00,0x00},
{0x00,0x3F,0x40,0x40,0x40,0x3F,0x00,0x00},
{0x00,0x1F,0x20,0x40,0x20,0x1F,0x00,0x00},
{0x00,0x3F,0x40,0x38,0x40,0x3F,0x00,0x00},
{0x00,0x63,0x14,0x08,0x14,0x63,0x00,0x00},
{0x00,0x03,0x04,0x78,0x04,0x03,0x00,0x00},
{0x00,0x61,0x51,0x49,0x45,0x43,0x00,0x00},
{0x00,0x7F,0x41,0x41,0x00,0x00,0x00,0x00},
{0x00,0x02,0x04,0x08,0x10,0x20,0x00,0x00},
{0x00,0x41,0x41,0x7F,0x00,0x00,0x00,0x00},
{0x00,0x04,0x02,0x01,0x02,0x04,0x00,0x00},
{0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00},
{0x00,0x01,0x02,0x04,0x00,0x00,0x00,0x00},
{0x00,0x20,0x54,0x54,0x54,0x78,0x00,0x00},
{0x00,0x7F,0x48,0x44,0x44,0x38,0x00,0x00},
{0x00,0x38,0x44,0x44,0x28,0x00,0x00,0x00},
{0x00,0x38,0x44,0x44,0x48,0x7F,0x00,0x00},
{0x00,0x38,0x54,0x54,0x54,0x18,0x00,0x00},
{0x00,0x08,0x7E,0x09,0x02,0x00,0x00,0x00},
{0x00,0x18,0xA4,0xA4,0xA4,0x7C,0x00,0x00},
{0x00,0x7F,0x08,0x04,0x04,0x78,0x00,0x00},
{0x00,0x00,0x7D,0x00,0x00,0x00,0x00,0x00},
{0x00,0x80,0x84,0x7D,0x00,0x00,0x00,0x00},
{0x00,0x7F,0x10,0x28,0x44,0x00,0x00,0x00},
{0x00,0x41,0x7F,0x40,0x00,0x00,0x00,0x00},
{0x00,0x7C,0x04,0x18,0x04,0x78,0x00,0x00},
{0x00,0x7C,0x08,0x04,0x7C,0x00,0x00,0x00},
{0x00,0x38,0x44,0x44,0x38,0x00,0x00,0x00},
{0x00,0xFC,0x24,0x24,0x18,0x00,0x00,0x00},
{0x00,0x18,0x24,0x24,0xFC,0x00,0x00,0x00},
{0x00,0x00,0x7C,0x08,0x04,0x00,0x00,0x00},
{0x00,0x48,0x54,0x54,0x24,0x00,0x00,0x00},
{0x00,0x04,0x7F,0x44,0x00,0x00,0x00,0x00},
{0x00,0x3C,0x40,0x40,0x7C,0x00,0x00,0x00},
{0x00,0x1C,0x20,0x40,0x20,0x1C,0x00,0x00},
{0x00,0x3C,0x40,0x30,0x40,0x3C,0x00,0x00},
{0x00,0x44,0x28,0x10,0x28,0x44,0x00,0x00},
{0x00,0x1C,0xA0,0xA0,0x7C,0x00,0x00,0x00},
{0x00,0x44,0x64,0x54,0x4C,0x44,0x00,0x00},
{0x00,0x08,0x36,0x41,0x00,0x00,0x00,0x00},
{0x00,0x00,0x7F,0x00,0x00,0x00,0x00,0x00},
{0x00,0x41,0x36,0x08,0x00,0x00,0x00,0x00},
{0x00,0x02,0x01,0x01,0x02,0x01,0x00,0x00},
{0x00,0x02,0x05,0x05,0x02,0x00,0x00,0x00}
};
void oledCommand( uint8_t ch )
{
uint8_t bytes[2];
bytes[0] = SSD1308_Command_Mode;
bytes[1] = ch;
i2c1Xfer( SSD1308_Address, bytes, 2, NULL, 0 );
}
void oledDisplayOffset( uint8_t offset )
{
uint8_t bytes[3];
bytes[0] = SSD1308_Command_Mode;
bytes[1] = 0xD3;
bytes[2] = offset;
i2c1Xfer( SSD1308_Address, bytes, 3, NULL, 0 );
}
void oledData( uint8_t data )
{
uint8_t bytes[2];
bytes[0] = SSD1308_Data_Mode;
bytes[1] = data;
i2c1Xfer( SSD1308_Address, bytes, 2, NULL, 0 );
}
void oledGotoYX(unsigned char Row, unsigned char Column)
{
oledCommand( 0xB0 + Row);
oledCommand( 0x00 + (8*Column & 0x0F) );
oledCommand( 0x10 + ((8*Column>>4)&0x0F) );
}
void oledPutChar( char ch )
{
if ( ( ch < 32 ) || ( ch > 127 ) )
ch = ' ';
const uint8_t *base = &OledFont[ch - 32][0];
uint8_t bytes[9];
bytes[0] = SSD1308_Data_Mode;
memmove( bytes + 1, base, 8 );
i2c1Xfer( SSD1308_Address, bytes, 9, NULL, 0 );
}
void oledPrint( char *s )
{
while (*s) oledPutChar( *s++);
}
void oledClear()
{
for ( uint16_t row = 0; row < 8; row++ ) {
for ( uint16_t col = 0; col < 16; col++ ) {
oledGotoYX( row, col );
oledPutChar( ' ' );
}
}
}
void oledInit()
{
oledCommand( SSD1308_Display_Off_Cmd );
__delay_ms( 100 );
oledCommand( SSD1308_Display_On_Cmd );
__delay_ms( 100 );
oledCommand( SSD1308_Normal_Display_Cmd );
oledCommand( SSD1308_Dectivate_Scroll_Cmd );
}
/////////////////////////////////////////////////////////////////////////
//
// Main
//
static void setupOscillator()
{
// Configure Internal FRC for 8MHz
CLKDIVbits.RCDIV = 0b000; // divide-by-1 = 8MHz
// Initiate Clock Switch to Internal FRCPLL (NOSC = 0b001)
__builtin_write_OSCCONH( 0x01 );
__builtin_write_OSCCONL( OSCCON | 0x01 );
// Wait for Clock switch to occur
while ( OSCCONbits.COSC != 0b001 );
// Wait for PLL to lock
while ( OSCCONbits.LOCK != 1 );
}
int main( int argc, char** argv )
{
setupOscillator();
ANSA = 0;
ANSB = 0;
__delay_ms( 2000 );
i2c1Reset();
i2c1Enable( kI2C_400KHZ );
oledInit();
oledClear();
oledGotoYX( 0, 0 );
oledPrint( "OLED SSD1308" );
uint16_t count = 0;
while ( 1 ) {
char s[20];
itoa( s, count, 10 );
oledGotoYX( 2, 0 );
oledPrint( s );
oledPrint( " " );
__delay_ms( 100 );
count++;
}
}