LM4F232 SSI example code

Hi, Try here: (Tiva)TM4C-2.1.0.12573/examples/boards/ek-lm4f232/hello

Hi Amit Ashara

I am trying to do coding for OLED Display using SSI Communication. Can you please help me for the code contentwise , as i dint found any example code for "OLED display using SSI Communication" .
I have attached the code here , please have a look into it and revert back.


#include "inc/hw_types.h"
#include "inc/hw_memmap.h"
#include "driverlib/fpu.h"
#include "driverlib/sysctl.h"
#include "driverlib/rom.h"
#include "driverlib/pin_map.h"
#include "grlib/grlib.h"
#include "drivers/cfal96x64x16.h"
#include "utils/uartstdio.h"
#include "driverlib/gpio.h"
#include "driverlib/ssi.h"
#include "inc/hw_ints.h"


#ifdef DEBUG
void
__error__(char *pcFilename, unsigned long ulLine)
{
}
#endif

void WriteDataToRfSpiChannel(UINT8 address, UINT8 data) ;

int main(void)
{


FPULazyStackingEnable();


SysCtlClockSet(SYSCTL_SYSDIV_20 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ | SYSCTL_OSC_MAIN); //10 MHz


SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
SysCtlPeripheralSleepEnable(SYSCTL_PERIPH_SSI0);


SSIClockSourceSet(SSI0_BASE, SSI_CLOCK_SYSTEM);
SSIConfigSetExpClk(SSI0_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_3, SSI_MODE_MASTER, SysCtlClockGet()/8, 8);


GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5);

GPIOPinConfigure(GPIO_PA2_SSI0CLK);
GPIOPinConfigure(GPIO_PA3_SSI0FSS);
GPIOPinConfigure(GPIO_PA4_SSI0RX);
GPIOPinConfigure(GPIO_PA5_SSI0TX);



SSIEnable(SSI0_BASE);

while(SSIDataGetNonBlocking(SSI0_BASE, &ulDataRx))
{
}
WriteDataToSpiChannel(address, data);
}


void WriteDataToSpiChannel(UINT8 address, UINT8 data)
{
tContext sContext;
tRectangle sRect;
uint32_t pui32DataTx[10];
uint32_t pui32DataRx[10];
uint32_t temp[10];

pui32DataTx = data;


SSIDataPut(SSI0_BASE, &pui32DataTx);

while(SSIBusy(SSI0_BASE))
{
}


temp = SSIDataGet(SSI0_BASE, &pui32DataRx);

////////////////////////////////// OLED DISPLAY ////////////////////////////////


CFAL96x64x16Init();


GrContextInit(&sContext, &g_sCFAL96x64x16);


sRect.sXMin = 0;
sRect.sYMin = 0;
sRect.sXMax = GrContextDpyWidthGet(&sContext) - 1;
sRect.sYMax = 12;
GrContextForegroundSet(&sContext, ClrDarkBlue);
GrRectFill(&sContext, &sRect);


GrContextForegroundSet(&sContext, ClrWhite);
GrRectDraw(&sContext, &sRect);

GrContextFontSet(&sContext, g_pFontCm14);
GrStringDrawCentered(&sContext, temp, -1,
GrContextDpyWidthGet(&sContext) / 2, 5, 0);

GrFlush(&sContext);

while(1)
{
}
}

Hello Petrei , Thanks a lot for the solution. It helps me a lot for my application.
One more doubt, For the dataput function, i.e..... ROM_SSIDataPut(DISPLAY_SSI_BASE, *pcData); , the #define used is
#define DISPLAY_SSI_BASE SSI2_BASE . But, SSI2_BASE means is that a register address or OLED address!

If I replace the OLED with other device for SPI communication , from where I should pull the address?

Thanks in advance.

Hi,

Please note you have three SSI modules on your micro, so if one module is used for an OLED display, then you may use another one for other SSI communication types, and use its base address for the new task.

In some extreme cases, you may use the same SSI module for other devices, but this means reconfiguration for each type, so it would be better to avoid it, at least for a while, until you get more experienced with this micro.

Petrei

Okay Petrei, will follow your suggestion. thanks for all your inputs and for your time. :)

Hello Petrei

One more input I need from you. May I please know where can I get the addresses/Page related info to OLED. As I am trying to do one line string scroll in oled .

Hi,

I think this display it is not so complicated like others - to write a string you may use the library function void GrStringDraw(..., i32X, i32Y, ...) where you have to refer points i32X, i32Y on display, where the string should be painted. The origin (0,0) is the upper left corner, if I remember well. Anyway, the Tiva/doc folder has a .pdf doc describing all internals of this display/graphics library.

Look also for display's data sheet.

Actually I want to scroll a particular string for some period in a single line. Some idea I got for my application through your response. thank you petrei. I ll try and update the status soon.
:)

Hello Petrei

I am looking for the line clear function for oled. I tried with this , "Display96x16x1ClearLine(unsigned long ulY); " . but dint worked for me . Is there any other function for clearing a particular line?????
Thank you

yeah the above mentioned command is for ek-lm3s811 launchpad i guess.

Hi,

You need to clear an ACII line (to wipe out a string) - the only method is to draw again a string with the same length as the original, but containing only spaces (0x20).

Take care in grlib a "line" is a graphical one, as for rectangle drawing. 

Petrei