The adafruit_ili9341_8bit_stm from iwalpola

GPIOA Problem

Dear Sir

I have managed to work with the screen thank you for that, but I think something in the library is not performing well.

It seems that the library (even when it set to - #define TFT_DATA_LOW_NIBBLE 1) does affect all GPIOA ports, I use PA14, PA15 to control relays and I see that with no action at all sometimes they change to HIGH mode and cannot be changed to LOW even when I run command digitalWrite(PA14,LOW) they do stay on high mode (I don’t have anything else in my code that address those pins but the relay switch code).
Also checked with GPIO PA10, PA11,PA12 and it is the same problem...

I think that something is wrong with this code:
_#define write8(c) { uint32_t val = (((c^0x00FF)<<16) | c)<<TFT_DATA_SHIFT; \

                                                                        dataRegs->BSRR = val; WR_STROBE; }_

If I change the pins from PA to PB (pins) or PC (pins) everything works well.

I don’t know what to look in your library that can affect those pins…

This Is a part from the H file.

#define TFT_DATA_PORT GPIOA

// Port data bits D0..D7:

// enable only one from below lines corresponding to your HW setup:

#define TFT_DATA_LOW_NIBBLE 1 // take the lower 8 bits: 0..7

//#define TFT_DATA_HIGH_NIBBLE 1 // take the higher 8 bits: 8..15

//Control pins |RD |WR |RS |CS |RST|

#define TFT_CNTRL_PORT GPIOB

#define TFT_RD PB4

#define TFT_WR PB5

#define TFT_RS PB10

#define TFT_CS PB11

#define TFT_RST PB3 //PB0

#define TFT_RD_MASK BIT4 // digitalPinToBitMask(TFT_RD) //

#define TFT_WR_MASK BIT5 // digitalPinToBitMask(TFT_WR) //

#define TFT_RS_MASK BIT10 // digitalPinToBitMask(TFT_RS) //

#define TFT_CS_MASK BIT11 // digitalPinToBitMask(TFT_CS) //

#if 0

            // use old definition, standard bit toggling, low speed

            #define RD_ACTIVE    digitalWrite(TFT_RD, LOW)

            #define RD_IDLE      digitalWrite(TFT_RD, HIGH)

            #define WR_ACTIVE    digitalWrite(TFT_WR, LOW)

            #define WR_IDLE      digitalWrite(TFT_WR, HIGH)

            #define CD_COMMAND   digitalWrite(TFT_RS, LOW)

            #define CD_DATA      digitalWrite(TFT_RS, HIGH)

            #define CS_ACTIVE    digitalWrite(TFT_CS, LOW)

            #define CS_IDLE      digitalWrite(TFT_CS, HIGH)

            #define CS_ACTIVE_CD_COMMAND      { CS_ACTIVE; CD_COMMAND; }

#else

            // use fast bit toggling, very fast speed!

extern gpio_reg_map * cntrlRegs;

            #define RD_ACTIVE                                                        { cntrlRegs->BRR  = TFT_RD_MASK; }

            #define RD_IDLE                                                                              { cntrlRegs->BSRR = TFT_RD_MASK; }

            #define WR_ACTIVE                                                       { cntrlRegs->BRR  = TFT_WR_MASK; }

            #define WR_IDLE                                                                             { cntrlRegs->BSRR = TFT_WR_MASK; }

            #define CD_COMMAND                                                               { cntrlRegs->BRR  = TFT_RS_MASK; }

            #define CD_DATA                                                                           { cntrlRegs->BSRR = TFT_RS_MASK; }

            #define CS_ACTIVE                                                         { cntrlRegs->BRR  = TFT_CS_MASK; }

            #define CS_IDLE                                                                               { cntrlRegs->BSRR = TFT_CS_MASK; }

            #define CS_ACTIVE_CD_COMMAND      { cntrlRegs->BRR  = (TFT_CS_MASK|TFT_RS_MASK); }

#endif

#define WR_STROBE { WR_ACTIVE; WR_IDLE; }

extern uint8_t read8_(void);

#define read8(x) ( x = read8_() )

extern gpio_reg_map * dataRegs;

#if defined(TFT_DATA_LOW_NIBBLE)

//#warning "Using lower data nibble..."

            // set the pins to input mode

            #define setReadDir() ( dataRegs->CRL = 0x88888888 )     // set the lower 8 bits as input

// #define setReadDir() ( dataRegs->CRL = 0x44444444 ) // set the lower 8 bits as input floating

            // set the pins to output mode

            #define setWriteDir() ( dataRegs->CRL = 0x33333333 )    // set the lower 8 bits as output

            #define TFT_DATA_SHIFT 0

#elif defined(TFT_DATA_HIGH_NIBBLE)

#warning "Using high data nibble..."

            // set the pins to input mode

            #define setReadDir() ( dataRegs->CRH = 0x88888888 )    // set the upper 8 bits as input

            // set the pins to output mode

            #define setWriteDir() ( dataRegs->CRH = 0x33333333 )   // set the lower 8 bits as output

            #define TFT_DATA_SHIFT 8

#endif

// set pins to output the 8 bit value

#if 0 // slow write

#define write8(c) { Serial.print(" write8: "); Serial.print(c,HEX); Serial.write(','); \

                                                                            digitalWrite(PA0, (c&BIT0)?HIGH:LOW); \

                                                                            digitalWrite(PA1, (c&BIT1)?HIGH:LOW); \

                                                                            digitalWrite(PA2, (c&BIT2)?HIGH:LOW); \

                                                                            digitalWrite(PA3, (c&BIT3)?HIGH:LOW); \

                                                                            digitalWrite(PA4, (c&BIT4)?HIGH:LOW); \

                                                                            digitalWrite(PA5, (c&BIT5)?HIGH:LOW); \

                                                                            digitalWrite(PA6, (c&BIT6)?HIGH:LOW); \

                                                                            digitalWrite(PA7, (c&BIT7)?HIGH:LOW); \

                                                                            WR_STROBE; }

#else

**_#define write8(c) { uint32_t val = (((c^0x00FF)<<16) | c)<<TFT_DATA_SHIFT; \

                                                                            /*Serial.print(" write8: "); Serial.print(val,HEX); Serial.write(',');*/ \

                                                                            dataRegs->BSRR = val; WR_STROBE; }_**

#endif

Strange colors (Set PCB from 16 bit to 8 bit)

Hello,

I try to work with your lib and tested on 2 tft ili9341 screens and I have the same error.
the display show only the blue color and when I change in the code to show in other color it still show blue...

What could be the problem? the wiring are correct (tested over and over that connections are made to the correct pin outs.

iwalpola / adafruit_ili9341_8bit_stm Goto Github PK

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GPIOA Problem

Strange colors (Set PCB from 16 bit to 8 bit)

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