TM4C123GH6PGE: TivaWare Graphics Library

Greetings Charles,

Staff/I ... 'feel your pain.'

Do note that poster:

• specifically requests response from (only) 'T.I.'ers'       "Dear all Ti Engineers"
• this thread serves as an 'off-shoot' from his earlier, 'List-Box Widget EXPANSION Quest' - which appears highly questionable - thus (all) follow-on efforts may (no matter how inspired/invested) prove in vain!

May staff note that (famed) 'Tags'  have 'gone the way' of  **LIKE!**     (making it difficult for staff to find 'past posts (blessed) w/properly describing Tags'  (i.e. More 'thoughtful/considered/colorful'  than (ahem)  'so very limited' MCU only!)     Tag appears now (only) w/in thread's opening post!

Hello Charles,

Thank you for your reply.

I previously sent a mail to the crystalfontz company in the US regarding Frame Rate, but no response.

I want to know the size of data sent per second.

<Formula of my thoughts>

Data size per second = Width * High * 3Pixel(RGB) * bit Number per Pixel * Frame Rate (fps)

I looked at the datasheet of CFAL 9664-FB1 and it says programmable Frame Rate 105hz.

I ask because the document is unclear or insufficient.

Normally I think it is 15fps, 30fps, 60fps frame.

Q1> Let me know number of frames sent per second. ?

Regards.

Jame,Shin

Hello Jame,

Ultimately Crystal Fontz will need to answer, but looking at the D/S my interpretation is that 105 Hz is a maximum rate because it sounds like they are trying to characterize the worst case normal mode power consumption. I would imagine it can support 15/30/60 Hz as well. 105 Hz is just another multiple of 15.

Hello Ralph and Charles,

Crystal Fontz is still not answered in company question emails.

Officially, Please send the following questions to the Crystal Fontz Company via Ti Company.

Attach [Figure 1] to the top for better understanding.

Q1> How much SCLK should I set if I convert RGB 888 24bit to RGB565 16bit and send it to SPI?

        The number 1 in [Figure 1] is changed from RGB888 24bit to RGB332 8bit in Tiva-TM4C MCU.

CFAL96x64x16Iint ( ) function in [Figure 1] writes g_ui8DisplayInitCommand [ ] array value to SSD1332 OLED Panel Controller with                        CFAL96x64x16Write Command () function to initialize OLED Panel after setting SPI Interface and Data 8bit, SCLK 4Mhz.

Analyze as below of initial command value.

(cfal96x64x16.c)

static

uint8_t g_ui8DisplayInitCommands[ ] =

{

//   0xAE,             // display off

   0x87, 0x07,       // master control current 7/16

   0x81, 0xA0,       // contrast A control

   0x82, 0x60,       // contrast B control

   0x83, 0xB0,       // contrast C control

   0xA0, 0x20,//00 // remap and data format - use 8-bit color mode

   0xBB, 0x1F,       // Vpa

   0xBC, 0x1F,       // Vpb

   0xBD, 0x1F,       // Vpc

//   0xAD, 0x8E,   // internal Vp, external supply

   0x26, 0x01,       // rectangle fill enabled

   0xAF               // display on

};

1. 0xA0, 0x20,//00 // remap and data format - use 8-bit color mode

               0xA0 // Set Re-Map & Data Format,

               0x20 // A[0]=0 Horizontal address increment (RESET)

                           A[0]=1, Vertical address increment

                           A[1]=0, Column address 0 is mapped to SEG0 (RESET)

                          A[1]=1, Column address 95 is mapped to SEG0

                           A[4]=0, Scan from COM 0 to COM [N –1]

                           A[4]=1, Scan from COM [N-1] to COM0. Where N is the Multiplex ratio.

                           A[5]=0, Disable COM Split Odd Even (RESET)

                           A[5]=1, Enable COM Split Odd Even

                           A[7:6]=00; 256 color format , 01; 65k color format(RESET)

           2. 0xBB, 0x1F, // Vpa ,   0xBC, 0x1F, // Vpb,   0xBD, 0x1F, // Vpc

             0xBB, 0xBC, 0xBD // VPA, VPB, VPC level setting for Color

               0x1F  // A[7:0] 0x00 0.43*VREF, 0x3F 0.83* VREF, 0xEF 1.0* VREF, 1xxxxxxx   connects to VCOMH   (RESET)

                         VREF (+13V) / 2^8(256) = 50.78mV (1 step) , 0x1F(31’d) , 50.78mV * 31 = 1.574 V

                         Vpa ,Vpb, Vpc = 1.574 V

Q2> In the previous post, I talked about what the frame rate can be programmed up to 105hz.

       Refer to No. 5 in the top of [Figure1] for DCLK, and below frame rate formula is “13 AC CHARACTERISTIS” in the datasheet.

       When calculated with the Command of Sample Code, the result is 891.5hz beyond 105hz.

       Please tell me what's wrong. ?

FFRM (Frame Frequency) = (Fosc x 1/(D x K x 64))

       Fosc = 0.97Mhz

       D : divide ratio (RESET=1) ,

       K : number of Display clocks (RESET=136, i.e. phase1 DCLK + phase2 DCLK + phase3 DCLK = 4+7+125)

   (CFAL9664B-F-B1_v1.1.pdf Sample Code in Datasheet)

---------------------------------------------------------------------------------

oled_cmd(0xB1);//phase 1 and period adjustment(discharge,charge)

oled_cmd(0xF1);

oled_cmd(0xB3);//display clock divider/oscillator frequency

oled_cmd(0xF0);

--------------------------------------------------------------------------------

           0xB1 // Phase 1 and 2 period adjustment (discharge,charge)

           0xF1 // A[3:0] Phase 1 period in 1~16 DCLK clocks [RESET=4h] = 1

                 // A[7:4] Phase 2 period in 1~16 DCLK clocks [RESET=7h] = 16

         0xB3 // display clock divider & oscillator frequency

           0xF0 // A[3:0] DCLK is generated from CLK divided by DIVIDER +1 (i.e., 1 to 16) = 1

                 // A[7:4] Fosc frequency, RESET=D0H , Frequency increases as level increases

D: divide ratio = 1

K: number of Display clocks = 1 + 16 =17

[RESULT]

FFRM (Frame Frequency) = (Fosc x 1/(D x K x 64))

                                              0.97e+6 x ( 1 / ( 1 x 17 x 64)) = 891.5 Hz

Q3> [Figure1] No.4 Gray Scale Table is the value when RGB565 16bit.

                   What is the value of Gray Scale Table when RGB332 is 8bit?

Q4> [Figure1] In No. 6, RGB332 8bit values are mapped to RGB565 16bit conversion table value.

                   What does it mean to convert from 8 bits to 16 bits?

                   For example, is MCU 8bit data converted from SSD1332 OLED Panel Control IC to 16bit again !!

Q5> [Figure1] No. 2 is displayed via No. 3 at the starting point of sending RGB332 8bit data. What is the response time?

Regards.

Jame,Shin

Hello Jame,

Jame shin said:

Officially, Please send the following questions to the Crystal Fontz Company via Ti Company.

This is not something we can do. At least, not Charles and I.

If you have a local TI contact for support maybe that is something they do, but neither Charles or I can take that action.

Hello Ralph and Charles,

Thank you for your reply

I said “Officially” because I thought the question would be easily communicated.

I was an imprudent  remark about it. and Sorry for not being humble.

I'm receiving mail from OLED's Crystalfontze company and talking.

As a result I will share in the question.

Thank you

Regards.

Jame,Shin