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adding ssd1306 oled example for pi A+

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2016-08-16 21:27:42 -04:00
parent 2a104cd10b
commit 98c15e60ba
7 changed files with 3571 additions and 0 deletions
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35
boards/piaplus/ssd1306a/Makefile Normal file
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ARMGNU ?= arm-none-eabi
#ARMGNU ?= arm-linux-gnueabi
COPS = -Wall -O2 -nostdlib -nostartfiles -ffreestanding
all : ssd1306a.bin
clean :
rm -f *.o
rm -f *.bin
rm -f *.hex
rm -f *.elf
rm -f *.list
rm -f *.img
rm -f *.bc
rm -f *.clang.s
start.o : start.s
$(ARMGNU)-as start.s -o start.o
ssd1306a.o : ssd1306a.c fontdata.h
$(ARMGNU)-gcc $(COPS) -c ssd1306a.c -o ssd1306a.o
periph.o : periph.c
$(ARMGNU)-gcc $(COPS) -c periph.c -o periph.o
ssd1306a.bin : memmap start.o periph.o ssd1306a.o
$(ARMGNU)-ld start.o periph.o ssd1306a.o -T memmap -o ssd1306a.elf
$(ARMGNU)-objdump -D ssd1306a.elf > ssd1306a.list
$(ARMGNU)-objcopy ssd1306a.elf -O ihex ssd1306a.hex
$(ARMGNU)-objcopy ssd1306a.elf -O binary ssd1306a.bin

39
boards/piaplus/ssd1306a/README Normal file
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See the top level README file for more information on documentation
and how to run these programs.
Derived from a microcontroller i2c version derived from a spi raspiberry
pi version.
If you search for ssd1306 at adafruit or micro oled atsparkfun you will
find similar displays.
On ebay though there are gobzillions, search for I2C serial oled this is
a 128x64. I paid under $4 shipping included each.
Looking at the top if the raspberry pi oriented with the two rows of
pins on your right, the top right pin of those is pin number 2, the
one below that on the outside is pin 4, 6, 8, and so on. Where the
uart TX and RX are.
The left side is pin 1,3,5,7 and so on. We are using those:
//inner corner
// 1 3.3v
// 3 GPIO2 SDA
// 5 GPIO3 SCL
// 7 GPOI4 (not used here)
// 9 Ground
// vcc gnd scl sda
Connect the display to the pi like this
OLED PI
------------
VCC PIN 1
GND PIN 9
SCL PIN 3
SDA PIN 2
You can google SSD1306 to find a datasheet.

2821
boards/piaplus/ssd1306a/fontdata.h Normal file
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12
boards/piaplus/ssd1306a/memmap Normal file
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MEMORY
{
ram : ORIGIN = 0x8000, LENGTH = 0x2000
}
SECTIONS
{
.text : { *(.text*) } > ram
.bss : { *(.bss*) } > ram
}

152
boards/piaplus/ssd1306a/periph.c Normal file
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//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
#define PBASE 0x20000000
extern void PUT32 ( unsigned int, unsigned int );
extern void PUT16 ( unsigned int, unsigned int );
extern void PUT8 ( unsigned int, unsigned int );
extern unsigned int GET32 ( unsigned int );
extern void dummy ( unsigned int );
#define ARM_TIMER_CTL (PBASE+0x0000B408)
#define ARM_TIMER_CNT (PBASE+0x0000B420)
#define GPFSEL1 (PBASE+0x00200004)
#define GPSET0 (PBASE+0x0020001C)
#define GPCLR0 (PBASE+0x00200028)
#define GPPUD (PBASE+0x00200094)
#define GPPUDCLK0 (PBASE+0x00200098)
#define AUX_ENABLES (PBASE+0x00215004)
#define AUX_MU_IO_REG (PBASE+0x00215040)
#define AUX_MU_IER_REG (PBASE+0x00215044)
#define AUX_MU_IIR_REG (PBASE+0x00215048)
#define AUX_MU_LCR_REG (PBASE+0x0021504C)
#define AUX_MU_MCR_REG (PBASE+0x00215050)
#define AUX_MU_LSR_REG (PBASE+0x00215054)
#define AUX_MU_MSR_REG (PBASE+0x00215058)
#define AUX_MU_SCRATCH (PBASE+0x0021505C)
#define AUX_MU_CNTL_REG (PBASE+0x00215060)
#define AUX_MU_STAT_REG (PBASE+0x00215064)
#define AUX_MU_BAUD_REG (PBASE+0x00215068)
//GPIO14 TXD0 and TXD1
//GPIO15 RXD0 and RXD1
//------------------------------------------------------------------------
unsigned int uart_lcr ( void )
{
return(GET32(AUX_MU_LSR_REG));
}
//------------------------------------------------------------------------
unsigned int uart_recv ( void )
{
while(1)
{
if(GET32(AUX_MU_LSR_REG)&0x01) break;
}
return(GET32(AUX_MU_IO_REG)&0xFF);
}
//------------------------------------------------------------------------
unsigned int uart_check ( void )
{
if(GET32(AUX_MU_LSR_REG)&0x01) return(1);
return(0);
}
//------------------------------------------------------------------------
void uart_send ( unsigned int c )
{
while(1)
{
if(GET32(AUX_MU_LSR_REG)&0x20) break;
}
PUT32(AUX_MU_IO_REG,c);
}
//------------------------------------------------------------------------
void uart_flush ( void )
{
while(1)
{
if((GET32(AUX_MU_LSR_REG)&0x100)==0) break;
}
}
//------------------------------------------------------------------------
void hexstrings ( unsigned int d )
{
//unsigned int ra;
unsigned int rb;
unsigned int rc;
rb=32;
while(1)
{
rb-=4;
rc=(d>>rb)&0xF;
if(rc>9) rc+=0x37; else rc+=0x30;
uart_send(rc);
if(rb==0) break;
}
uart_send(0x20);
}
//------------------------------------------------------------------------
void hexstring ( unsigned int d )
{
hexstrings(d);
uart_send(0x0D);
uart_send(0x0A);
}
//------------------------------------------------------------------------
void uart_init ( void )
{
unsigned int ra;
PUT32(AUX_ENABLES,1);
PUT32(AUX_MU_IER_REG,0);
PUT32(AUX_MU_CNTL_REG,0);
PUT32(AUX_MU_LCR_REG,3);
PUT32(AUX_MU_MCR_REG,0);
PUT32(AUX_MU_IER_REG,0);
PUT32(AUX_MU_IIR_REG,0xC6);
PUT32(AUX_MU_BAUD_REG,270);
ra=GET32(GPFSEL1);
ra&=~(7<<12); //gpio14
ra|=2<<12; //alt5
ra&=~(7<<15); //gpio15
ra|=2<<15; //alt5
PUT32(GPFSEL1,ra);
PUT32(GPPUD,0);
for(ra=0;ra<150;ra++) dummy(ra);
PUT32(GPPUDCLK0,(1<<14)|(1<<15));
for(ra=0;ra<150;ra++) dummy(ra);
PUT32(GPPUDCLK0,0);
PUT32(AUX_MU_CNTL_REG,3);
}
//------------------------------------------------------------------------
void timer_init ( void )
{
//0xF9+1 = 250
//250MHz/250 = 1MHz
PUT32(ARM_TIMER_CTL,0x00F90000);
PUT32(ARM_TIMER_CTL,0x00F90200);
}
//-------------------------------------------------------------------------
unsigned int timer_tick ( void )
{
return(GET32(ARM_TIMER_CNT));
}
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
//
// Copyright (c) 2012 David Welch dwelch@dwelch.com
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//-------------------------------------------------------------------------

462
boards/piaplus/ssd1306a/ssd1306a.c Normal file
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//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
// 2 outer corner sd card end
// 4
// 6
// 8 TX out
// 10 RX in
//inner corner
// 1 3.3v
// 3 GPIO2 SDA1
// 5 GPIO3 SCL1
// 7 GPOI4
// 9 Ground
// vcc gnd scl sda
extern void PUT32 ( unsigned int, unsigned int );
extern void PUT16 ( unsigned int, unsigned int );
extern void PUT8 ( unsigned int, unsigned int );
extern unsigned int GET32 ( unsigned int );
extern unsigned int GETPC ( void );
extern void dummy ( unsigned int );
extern unsigned int BRANCHTO ( unsigned int );
extern void uart_init ( void );
extern unsigned int uart_lcr ( void );
extern void uart_flush ( void );
extern void uart_send ( unsigned int );
extern unsigned int uart_recv ( void );
extern unsigned int uart_check ( void );
extern void hexstring ( unsigned int );
extern void hexstrings ( unsigned int );
extern void timer_init ( void );
extern unsigned int timer_tick ( void );
extern void timer_init ( void );
extern unsigned int timer_tick ( void );
//count up timer
#define ARM_TIMER_LOD 0x2000B400
#define ARM_TIMER_VAL 0x2000B404
#define ARM_TIMER_CTL 0x2000B408
#define ARM_TIMER_DIV 0x2000B41C
#define ARM_TIMER_CNT 0x2000B420
#define GPFSEL0 0x20200000
#define GPSET0 0x2020001C
#define GPCLR0 0x20200028
#define GPLEV0 0x20200034
#define PADDR 0x78
#define SETCONTRAST 0x81
#define DISPLAYALLONRESUME 0xA4
#define DISPLAYALLON 0xA5
#define NORMALDISPLAY 0xA6
#define INVERTDISPLAY 0xA7
#define DISPLAYOFF 0xAE
#define DISPLAYON 0xAF
#define SETDISPLAYOFFSET 0xD3
#define SETCOMPINS 0xDA
#define SETVCOMDESELECT 0xDB
#define SETDISPLAYCLOCKDIV 0xD5
#define SETPRECHARGE 0xD9
#define SETMULTIPLEX 0xA8
#define SETLOWCOLUMN 0x00
#define SETHIGHCOLUMN 0x10
#define SETSTARTLINE 0x40
#define MEMORYMODE 0x20
#define COMSCANINC 0xC0
#define COMSCANDEC 0xC8
#define SEGREMAP 0xA0
#define CHARGEPUMP 0x8D
#define EXTERNALVCC 0x01
#define SWITCHCAPVCC 0x02
unsigned int hex_screen_history[8];
#include "fontdata.h"
#define SDA 2
#define SCL 3
//625 ticks of a 250Mhz clock is the minimum count for 400mhz basically.
//2.5us * 250mhz = 625 does that sound right?
//156.25 ticks per quarter cycle.
//------------------------------------------------------------------------
static void i2c_delay ( void )
{
unsigned int beg,end;
beg=GET32(ARM_TIMER_CNT);
while(1)
{
end=GET32(ARM_TIMER_CNT);
if((end-beg)>400) break;
}
}
//------------------------------------------------------------------------
static void scl_high ( void )
{
PUT32(GPSET0,1<<SCL);
}
//------------------------------------------------------------------------
static void sda_high ( void )
{
PUT32(GPSET0,1<<SDA);
}
//------------------------------------------------------------------------
static void scl_low ( void )
{
PUT32(GPCLR0,1<<SCL);
}
//------------------------------------------------------------------------
static void sda_low ( void )
{
PUT32(GPCLR0,1<<SDA);
}
//------------------------------------------------------------------------
static unsigned int sda_read ( void )
{
unsigned int ra;
ra=GET32(GPLEV0);
ra&=(1<<SDA);
return(ra);
}
//------------------------------------------------------------------------
static void sda_input ( void )
{
unsigned int ra;
ra=GET32(GPFSEL0);
ra&=~(7<<(SDA*3));
//ra|=1<<(SDA*3);
PUT32(GPFSEL0,ra);
}
//------------------------------------------------------------------------
static void sda_output ( void )
{
unsigned int ra;
ra=GET32(GPFSEL0);
ra&=~(7<<(SDA*3));
ra|=1<<(SDA*3);
PUT32(GPFSEL0,ra);
}
//------------------------------------------------------------------------
static void i2c_start ( void )
{
i2c_delay();
i2c_delay();
sda_low();
i2c_delay();
i2c_delay();
scl_low();
i2c_delay();
}
//------------------------------------------------------------------------
static void i2c_stop ( void )
{
i2c_delay();
scl_high();
i2c_delay();
sda_high();
i2c_delay();
i2c_delay();
}
//------------------------------------------------------------------------
unsigned int i2c_write_byte ( unsigned int b )
{
unsigned int ra;
for(ra=0x80;ra;ra>>=1)
{
i2c_delay();
if(ra&b) sda_high();
else sda_low();
i2c_delay();
scl_high();
i2c_delay();
scl_low();
i2c_delay();
sda_low();
i2c_delay();
}
i2c_delay();
sda_input();
i2c_delay();
scl_high();
i2c_delay();
ra=sda_read();
i2c_delay();
scl_low();
i2c_delay();
sda_output();
i2c_delay();
return(ra);
}
//------------------------------------------------------------------------
unsigned int i2c_read_byte ( unsigned int *b )
{
unsigned int ra;
unsigned int rb;
i2c_delay();
sda_input();
rb=0;
for(ra=0;ra<9;ra++)
{
i2c_delay();
scl_high();
i2c_delay();
rb<<=1;
if(sda_read()) rb|=1;
i2c_delay();
scl_low();
i2c_delay();
}
sda_output();
i2c_delay();
ra=rb&1;
*b=rb>>1;
return(ra);
}
//------------------------------------------------------------------------
void send_command ( unsigned int cmd )
{
// PUT32(GPCLR0,1<<25); //D/C = 0 for command
//spi_one_byte(cmd);
i2c_start();
if(i2c_write_byte(PADDR))
{
i2c_stop();
hexstring(0xBADBAD00);
return;
}
//not continuing
//want D/C a zero
if(i2c_write_byte(0x00))
{
//i2c_stop();
//hexstring(0xBADBAD00);
//return;
}
if(i2c_write_byte(cmd))
{
//i2c_stop();
//hexstring(0xBADBAD00);
//return;
}
i2c_stop();
}
//------------------------------------------------------------------------
void send_data ( unsigned int data )
{
//PUT32(GPSET0,1<<25); //D/C = 1 for data
//spi_one_byte(data);
i2c_start();
if(i2c_write_byte(PADDR))
{
i2c_stop();
hexstring(0xBADBAD00);
return;
}
//not continuing
//want D/C a one
if(i2c_write_byte(0x40))
{
//i2c_stop();
//hexstring(0xBADBAD00);
//return;
}
if(i2c_write_byte(data))
{
//i2c_stop();
//hexstring(0xBADBAD00);
//return;
}
i2c_stop();
}
//------------------------------------------------------------------------
void SetPageStart ( unsigned int x )
{
send_command(0xB0|(x&0x07));
}
//------------------------------------------------------------------------
void SetColumn ( unsigned int x )
{
//x+=0x20;
send_command(0x10|((x>>4)&0x0F));
send_command(0x00|((x>>0)&0x0F));
}
//------------------------------------------------------------------------
void show_text(unsigned int col, char *s)
{
unsigned int ra;
SetPageStart(col);
SetColumn(0);
while(*s)
{
for(ra=0;ra<8;ra++) send_data(fontdata[(unsigned)(*s)][ra]);
s++;
}
}
//------------------------------------------------------------------------
void show_text_hex(unsigned int col, unsigned int x)
{
unsigned int ra;
unsigned int rb;
unsigned int rc;
SetPageStart(col);
SetColumn(0);
for(ra=0;ra<8;ra++)
{
rb=(x>>28)&0xF;
if(rb>9) rb+=0x37; else rb+=0x30;
x<<=4;
for(rc=0;rc<8;rc++) send_data(fontdata[rb][rc]);
}
}
//------------------------------------------------------------------------
void hex_screen ( unsigned int x )
{
unsigned int ra;
for(ra=0;ra<7;ra++)
{
hex_screen_history[ra]=hex_screen_history[ra+1];
show_text_hex(ra,hex_screen_history[ra]);
}
hex_screen_history[ra]=x;
show_text_hex(ra,hex_screen_history[ra]);
}
//------------------------------------------------------------------------
void ClearScreen ( void )
{
unsigned int ra;
unsigned int rb;
for(ra=0;ra<8;ra++)
{
SetPageStart(ra);
SetColumn(0);
for(rb=0;rb<0x80;rb++) send_data(0);
}
}
//------------------------------------------------------------------------
int notmain ( void )
{
unsigned int ra;
uart_init();
hexstring(0x12345678);
PUT32(ARM_TIMER_CTL,0x00000000);
PUT32(ARM_TIMER_CTL,0x00000200);
ra=GET32(GPFSEL0);
ra&=~(7<<(SDA*3));
ra&=~(7<<(SCL*3));
ra|=1<<(SDA*3);
ra|=1<<(SCL*3);
PUT32(GPFSEL0,ra);
scl_high();
sda_high();
i2c_delay();
i2c_delay();
i2c_delay();
////find who acks
//for(ra=0;ra<0x100;ra+=2)
//{
//unsigned int rb;
////hexstrings(ra);
//i2c_start();
//rb=i2c_write_byte(ra|0);
//i2c_stop();
////hexstring(rb);
//if(rb==0) hexstring(ra);
//}
////0x78 is the address
if(1)
{
// Display Init sequence for 64x48 OLED module
send_command(DISPLAYOFF); // 0xAE
send_command(SETDISPLAYCLOCKDIV); // 0xD5
send_command(0x80); // the suggested ratio 0x80
send_command(SETMULTIPLEX); // 0xA8
send_command(0x3F);
send_command(SETDISPLAYOFFSET); // 0xD3
send_command(0x0); // no offset
send_command(SETSTARTLINE | 0x0); // line #0
send_command(CHARGEPUMP); // enable charge pump
send_command(0x14);
send_command(MEMORYMODE);
send_command(0x02);
send_command(SEGREMAP | 0x1);
send_command(COMSCANDEC);
send_command(SETCOMPINS); // 0xDA
send_command(0x12);
send_command(SETCONTRAST); // 0x81
send_command(0x7F);
send_command(SETPRECHARGE); // 0xd9
send_command(0xF1);
send_command(SETVCOMDESELECT); // 0xDB
send_command(0x40);
send_command(NORMALDISPLAY); // 0xA6
send_command(DISPLAYALLONRESUME); // 0xA4
ClearScreen();
send_command(DISPLAYON); //--turn on oled panel
//send_command(DISPLAYALLON);
show_text(0,"HELLO");
show_text(1,"World!");
show_text_hex(2,0x12345678);
show_text_hex(3,0xABCDEF00);
for(ra=0;ra<=0x200;ra++) show_text_hex(5,ra);
//ClearScreen();
for(ra=0;ra<8;ra++) hex_screen_history[ra]=0;
for(ra=0;ra<0x1000;ra++) hex_screen(ra);
}
hexstring(0x12341234);
return(0);
}
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
//
// Copyright (c) 2014 David Welch dwelch@dwelch.com
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//-------------------------------------------------------------------------

50
boards/piaplus/ssd1306a/start.s Normal file
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;@-------------------------------------------------------------------------
;@-------------------------------------------------------------------------
.globl _start
_start:
mov sp,#0x8000
bl notmain
hang: b hang
.globl PUT32
PUT32:
str r1,[r0]
bx lr
.globl GET32
GET32:
ldr r0,[r0]
bx lr
.globl dummy
dummy:
bx lr
.globl GETPC
GETPC:
mov r0,lr
bx lr
.globl BRANCHTO
BRANCHTO:
bx r0
;@-------------------------------------------------------------------------
;@-------------------------------------------------------------------------
;@-------------------------------------------------------------------------
;@
;@ Copyright (c) 2012 David Welch dwelch@dwelch.com
;@
;@ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
;@
;@ The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
;@
;@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
;@
;@-------------------------------------------------------------------------