OLED SSD1322 don't Work
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2017-08-03 12:44 AM
Hi everyone,
ì'm trying to use te OLED MCOT256064BA-WM with the SSD1322 Driver.
Is so frustrating to be in the situation that the code seems really correct at least , but the OLED don't still Work.
I need Help!
i'm using the STM32F412ZGTx, the OLED is a 256x64
The code is Here, i Think the problem is the initialization of the driver , at the Oscilloscope the SPI Communication seems ok !
Thank you very much for every incoming help!!
void Oled_setupSSD1233(void)
{ //Si esegue procedura di accensione riportata sul datasheet del SSD1322//1) Power on STM32 e quindi VCI,VDDIO (MCU 3,3v)
HAL_GPIO_WritePin(Oled_NSS_Port, Oled_NSS_Pin, 1); // trasmissione non attiva HAL_Delay(5); //5ms da datasheet bisogna aspettare almeno 1ms che la 3.3 V dal micro diventi stabile //2) Delay Minimum 1 ms HAL_GPIO_WritePin(Oled_RST_Port, Oled_RST_Pin, 1); //non attivo HAL_Delay(200); HAL_GPIO_WritePin(Oled_RST_Port, Oled_RST_Pin, 0); // Reset SSD1322// 3) // Display Off
//128MUX // column and address normals , Display start line is set at display ram address 0 // Normal scan direction COm Outputs // contrast control register set at 7FhHAL_Delay(50); //4) 100micros datasheet
HAL_GPIO_WritePin(Oled_RST_Port, Oled_RST_Pin, 1); // 5) Reset off HAL_Delay(200); //50m // HAL_GPIO_WritePin(OLED_PWR_EN_GPIO_Port, OLED_PWR_EN_Pin, 1); // 6) Power on Vcc (12V) da Switch HAL_Delay(500); //6) wait at least 200mS and than 300, Vcc become stableReset_Device(); //7) inizializzazione
HAL_Delay(300);
} void Reset_Device(void) { // Lots of reset/tweaking commands followdisplaySend(SEND_CMD, 0xFD); // Set Command Lock (MCU protection status) ok
displaySend(SEND_CMD, 0xAE); // Sleep On (DisplayOFF) ok, displaySend(SEND_DAT, 0x12); // = Reset Unlocked Oled driver , se Locked accetta solo il Comando FDhdisplaySend(SEND_CMD, 0xB3); // Set Front Clock Divider / Oscillator Frequency
displaySend(SEND_DAT, 0x91); // = reset / 1100b (0xD0) divide per due , selezionata frequenza che non so , boh!!!//displaySend(SEND_DAT, 0xC0); // frequenza oscillatore a quella di reset e divisore 0, PROVARE
//displaySend(SEND_DAT, 0xD0) prova anche questodisplaySend(SEND_CMD, 0xCA); // Set MUX Ratio
displaySend(SEND_DAT, 0x3F); // = 63dec = 64MUX da 0 a 63 , numero di Righe attive (settate) che verranno eseguite in un unico frame.displaySend(SEND_CMD, 0xA2); // Set Display Offset ok
displaySend(SEND_DAT, 0x00); // = RESETdisplaySend(SEND_CMD, 0xA1); // Set Display Start Line ok
displaySend(SEND_DAT, 0x00); // = register 00hdisplaySend(SEND_CMD, 0xA0); // Set Re-map and Dual COM Line mode
//displaySend2(SEND_DAT, 0x14,0x11); // = Reset except Enable Nibble Re-map, Scan from COM[N-1] to COM0, where N is the Multiplex ratio displaySend(SEND_DAT, 0x14); displaySend(SEND_DAT, 0x11);displaySend(SEND_CMD, 0xB5); // Set GPIO
displaySend(SEND_DAT, 0x00); // = GPIO0, GPIO1 = HiZ alta impedenza, Input Disabled //ok, ma capire cos'è!!!displaySend(SEND_CMD, 0xAB); // Function Selection
displaySend(SEND_DAT, 0x01); // = reset = Enable internal VDD regulator ok displaySend(SEND_CMD, 0xB4); // Display Enhancement A //displaySend2(SEND_DAT, 0xA0,0xFD); // = Enable external VSL (OK) displaySend(SEND_DAT, 0xA0); // = Low GS display quality, for Normal (reset) send 0xB5 //ok displaySend(SEND_DAT, 0xFD);displaySend(SEND_CMD, 0xC1); // Set Contrast Current //ok, ma capire cos'è
displaySend(SEND_DAT, 0x9F); // = reset (0x7F) // 0xffdisplaySend(SEND_CMD, 0xC7); // Master Contrast Current Control// ok
displaySend(SEND_DAT, 0x0F); // = no changedisplaySend(SEND_CMD, 0xB9); // Select Default Linear Gray Scale table//ok
displaySend(SEND_CMD, 0xB1); // Set Phase Length //ok displaySend(SEND_DAT, 0xE2); // = Phase 1 period (reset phase length) = 5 DCLKs, Phase 2 period (first pre- charge phase length) = 14 DCLKsdisplaySend(SEND_CMD, 0xD1); // Display Enhancement B //ok
//displaySend2(SEND_DAT, 0x82,0x20); // = Normal (reset) (0xA2) displaySend(SEND_DAT, 0x82); // n/a displaySend(SEND_DAT, 0x20);displaySend(SEND_CMD, 0xBB); // Set Pre-charge voltage
displaySend(SEND_DAT, 0x1F); // = 0.60 x VCC //okdisplaySend(SEND_CMD, 0xB6); // Set Second Precharge Period //ok
displaySend(SEND_DAT, 0x08); // = 8 dclks [reset]displaySend(SEND_CMD, 0xBE); // Set VCOMH
displaySend(SEND_DAT, 0x07); // = 0.86 x VCC //okdisplaySend(SEND_CMD, 0xA6); // Set Display Mode = Normal Display //ok
displaySend(SEND_CMD, 0xA9); // Exit Partial Display //ok
Clear_RAM(); // ClearDisplay(); //displaySend(SEND_CMD, 0xA4); // spegne solo tutti i pixels dello schermo , serve una funzione clear che setti anche le dimensioni dello schermo e abiliti la RAM displaySend(SEND_CMD, 0xAF); // Set Sleep mode OFF (Display ON) // HAL_Delay(10); //0.01s }void Clear_RAM(void){
unsigned char x,y;Set_Column_Address(0x00, 0x77); // ci sono 120 colonne comprendenti ognuna 4 SEG ( pixels) , 25674 = 64 (3Fh) (63 dec da 0 a 63)
Set_Row_Address(0x00,0x7F); // 128max, 63 dec , 0 a 63 sono 64 righe, dovrebbe essere impostata la dimensione dell'OLED 256x Set_Write_RAM(); for(y=0;y<128;y++){ for(x=0;x<120;x++) // 119 cicli
{ displaySend(SEND_DAT, 0x00); } } }void displaySend(uint8_t sendType, unsigned char v)
{ displaySendStart(sendType); // controlla sendType(comando o dato) e setta CD di conseguenza , attiva sempre CS displaySendData(v); // v trasmesso da SPI displaySendEnd(); //Chip Select alto }void displaySendData(unsigned char v)
{ //SPI.transfer(v); uint8_t aTxBuffer[] = {0x00}, aRxBuffer[] = {0x00}; aTxBuffer[0] = v; HAL_SPI_TransmitReceive(&OLEDspi2, (uint8_t *)aTxBuffer, (uint8_t *)aRxBuffer, 1, 250); }void displaySendStart(uint8_t sendType)
{HAL_GPIO_WritePin(Oled_NSS_Port, Oled_NSS_Pin, 0); // se non funziona OLED, Spostare in fondo alla funzione
if (sendType == SEND_DAT) { HAL_GPIO_WritePin(Oled_CD_Port, Oled_CD_Pin, 1); } else if (sendType == SEND_CMD) { HAL_GPIO_WritePin(Oled_CD_Port, Oled_CD_Pin, 0); }}
void displaySendEnd(void)
{ HAL_GPIO_WritePin(Oled_NSS_Port, Oled_NSS_Pin, 1); }void Oled_Loop(void)
{ displaySend(SEND_CMD, 0xA5); // Entire Display ON, all pixels turns ON in GS level 15 HAL_Delay(1000); } #oled #stm32-f Note: this post was migrated and contained many threaded conversations, some content may be missing.Solved! Go to Solution.
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2017-09-12 01:36 AM
Problem Solved, the bug was a not clear specification of a FPC SMD Connector that i used on the board i've designed for the OLED !
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2017-08-07 03:10 AM
No one can help me in anyway????
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2017-08-07 05:55 AM
Thanks for help.
i've checked SPI signals with the Oscilloscope , is all ok , the bytes that i sent are right and correctly coded.
Same for Supply sgnals.
There are not good examples on internet, i used the examples of the datasheet......
Are you familiar with the ssd1322 ??
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2017-08-07 06:10 AM
Check power/ground and all signals connection directly at the display. Check signals mutual timing against display driver datasheet. Check signals waveshape using an oscilloscope. Try to bit-bang rather than using hardware SPI. Check the initialization sequence against other publicly available examples.
JW
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2017-08-07 08:31 AM
you have just used an OLED before??
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2017-08-07 09:15 AM
Hello!
I use other solomontech lcd driver in spi mode.
What protocol you use ? 3 or 4 wire?(for spi init)
I saw HAL_GPIO_WritePin(Oled_NSS_Port, Oled_NSS_Pin, 1);
What you mean NSS_Port? Do you have other slaves in your Bus?
You don't use CS pin in every SPI transaction. It's not optional to keep steady this pin.
So at least your displaySend() function, must begin with CS_LOW and ends with CS_HI .(keeping ofcourse all timings)
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2017-08-07 09:19 AM
I have used SSD1332 but in parallel mode.
displaySend(SEND_CMD, 0xFD); // Set Command Lock (MCU protection status) ok
displaySend(SEND_CMD, 0xAE); // Sleep On (DisplayOFF) ok,
0xFD has one parameter
I haven't checked the rest of your sequence.
JW
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2017-08-08 01:51 AM
i'm using SPI 4 Wire ....... NSS_Port ise te GPIOB , the pin of the chip selecyt is PB12.
i'don't have oher slaves, i use a software nss , because the Hrdware chip select didn't work at Oscilloscope.
For the CS use , if you intend the chip select , for me is NSS! if you speak about Data/Command , every time i sent a byte :
void displaySendStart(uint8_t sendType)
{HAL_GPIO_WritePin(Oled_NSS_Port, Oled_NSS_Pin, 0);
if (sendType == SEND_DAT) { HAL_GPIO_WritePin(Oled_CD_Port, Oled_CD_Pin, 1); } else if (sendType == SEND_CMD) { HAL_GPIO_WritePin(Oled_CD_Port, Oled_CD_Pin, 0); }What do you think about the function ResetDevice() ( ssd 1322 inizialization) ?? the display is a 256x64!
i have another issue , i set Chip Select Low and than High every time i sent a byte , is possible that Chip Select must be set Low at the start of communication of all bytes and High at the end? all initialization must be sent in an single communication cycle??
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2017-08-08 01:55 AM
yes , i've seen the error bur the problem is not solved !!!
displaySend(SEND_CMD, 0xFD); // Set Command Lock (MCU protection status) ok
displaySend(SEND_DAT, 0x12); // = Reset Unlocked Oled driverdisplaySend(SEND_CMD, 0xAE); // Sleep On (DisplayOFF) ok,
What about the rest?
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2017-08-08 04:01 AM
Compared to what I use for init, Enable Gray Scale table (cmd 0x00) is missing.
> There are not good examples on internet
Yes there are. Google is your friend.
JW