GLCD with SPI and HI2C

[MBB]

I'm using this GLCD: https://learn.adafruit.com/adafruit-mini-tft-featherwing
It is an ST7735R which uses SPI. When I use software with only SPI commands in it everything works great.

If I use it with a circuit that uses both SPI and I2C I have problems. In the below program the first three " GLCDPrint" statements work correctly. After they print on the GLCD screen, the screen turns white and stays white.

Subsequent " GLCDPrint" commands do not work. When I connect an oscilloscope to the SPI SCK (portD.7) and SPI DO (portC.7) ports I see clock and data pulses being sent whenever I press any of the switches.

Is GCB able to switch back and forth between I2C and SPI commands? If so what am I doing wrong?

'Chip Settings.
    #chip 18F4550,48
        #config PLLDIV=1, CPUDIV=OSC1_PLL2, OSC=HSPLL_HS, LVP=OFF, MCLRE=ON
            #include <glcd.h>
                #define HI2C_BAUD_RATE 100
                    #define HI2C_DATA PORTB.0
                        #define HI2C_CLOCK PORTB.1
                            #define MiniTFT_WRITEADDR 188
                                #define MiniTFT_READADDR 189
                                     #define GLCD_TYPE GLCD_TYPE_ST7735R_160_80
                                        #define ST7735TABCOLOR ST7735_GREENTAB

   'Pin mappings for SPI ST7735R
        #define GLCD_DC         portE.2              'Data/Command select   Purple Wire
            #define GLCD_CS         portB.2              'CS Chip select        White
            #define GLCD_RESET      portC.6              '                      Gray
                #define GLCD_DO         portC.7              'SPI SDO (MOSI)        Blue
                    #define GLCD_DI         portC.7              'SPI SDI (MISO)  assume bi-directional DO/DI
                        #define GLCD_SCK        portD.7              'SPI SCK               Green

                            #define RESET_Pin 28
                                #define CTRL_Reset 0 
                                    #define DirClr_GPIO 3 
                                        #define PullenSet_GPIO 11 
                                            #define Set_FunctionReg 5 
                                                   #define Module_Base_Address_GPIO 1 
                                                    #define GPIO_BULK 4
                                                        #define Module_Base_Address_AD 9
                                                               #define Module_function_register_address_AD0 7
                                                                   #define Module_function_register_address_AD1 8

Dir HI2C_DATA in
Dir HI2C_CLOCK in

HI2CMode Master

'The Mini TFT needs 4.1 VDC for the GLCD good display quality.  PIC needs to run at 5 VDC.
' It will work with 3.5 VDC but colors may blur.

'GLCD screen has black background with the below on it
  GLCDCLS
    GLCDRotate ( Landscape )
      GLCDPrint(4, 0, "Great", TFT_YELLOW )
        GLCDPrint(4, 10, "Cow", TFT_GREEN )
             GLCDPrint(4, 20, "Basic", TFT_WHITE )                ; This Works
  wait 2 s

Do_Again:

'GLCD screen goes white and stays white

'Setup SAM-D09 chip
  HI2CStart
    HI2CSend MiniTFT_WRITEADDR
      HI2CSend Module_Base_Address_GPIO
        HI2CSend DirClr_GPIO
          HI2CSend 211
            HI2CSend 198
              HI2CSend 207
                HI2CSend 220
                  HI2CStop

  HI2CStart
    HI2CSend MiniTFT_WRITEADDR
      HI2CSend Module_Base_Address_GPIO
        HI2CSend PullenSet_GPIO 
          HI2CSend 211
            HI2CSend 198
              HI2CSend 207
                HI2CSend 220
                  HI2CStop

  HI2CStart
    HI2CSend MiniTFT_WRITEADDR
      HI2CSend Module_Base_Address_GPIO
        HI2CSend Set_FunctionReg
          HI2CSend 211
            HI2CSend 198
              HI2CSend 207
                HI2CSend 220
                  HI2CStop

'Read Switch Data from SAM-D09
    HI2CStart
      HI2CSend MiniTFT_WRITEADDR
        HI2CSend Module_Base_Address_GPIO
          HI2CSend GPIO_BULK
            HI2CRestart
              HI2CSend MiniTFT_READADDR
                HI2CReceive Fourth_Byte
                  HI2CReceive Third_Byte
                    HI2CReceive Button_XYS
                      HI2CReceive Button_AB, Nack 
                        HI2CStop

'The below 7 lines do NOT work - there is only a white screen - No printing occurs
        If Button_XYS.1 = 0 then GLCDPrint(4, 10, "Button B", TFT_RED )
          If Button_XYS.2 = 0 then GLCDPrint(4, 0, "Button A", TFT_YELLOW )
            If Button_XYS.3 = 0 then GLCDPrint(4, 60, "SELECT", TFT_RED )

        If Button_AB.2 = 0 then GLCDPrint(4, 20, "UP", TFT_RED )
          If Button_AB.3 = 0 then GLCDPrint(4, 30, "LEFT", TFT_RED )
            If Button_AB.4 = 0 then GLCDPrint(4, 40, "DOWN", TFT_RED )
              If Button_AB.7 = 0 then GLCDPrint(4, 50, "RIGHT", TFT_RED )


Goto Do_Again

[Anobium]

Is this using the new library I provided?

[Anobium]

Please put the project in a ZIP. I will delete the .h posts. It will confuse readers.
I need the ST7735 (two files) also.

[MBB]

The code

[MBB]

Here

[Anobium]

Have you confirmed the HWI2C works? Output the i2C discover to a serial terminal not the GLCD.

Did you check I2C discovery? First rule of I2C - is test with I2C discovery.

There is nothing obvious in the code. So, I would be check oit I2C discovery.

[MBB]

Yes, HWI2C is working. In my original program there was more code and the "IF" statements were bigger. I changed them in the version I sent you to reduce the confusion. (the version I sent you has the same problem as the longer version)

Here is what was after the HI2C READ. (All of this worked except the "GLCDPrint" statements.

                      locate 0, 0
                        print Fourth_Byte
                          print " "
                            print ByteToBin(Fourth_Byte)

                              locate 1, 0
                                print Third_Byte
                                  print " "
                                    print ByteToBin(Third_Byte)

                                      locate 2, 0
                                        print Button_XYS
                                          print " "
                                            print ByteToBin(Button_XYS)

                                              locate 3, 0
                                                print Button_AB
                                                  print " "
                                                    print ByteToBin(Button_AB)

locate 0, 14

    If Button_XYS.1 = 0 then
      print "B"
        GLCDPrint(4, 10, "Button B", TFT_RED )
          End If

            If Button_XYS.2 = 0 then
              print "A"
                GLCDPrint(4, 0, "Button A", TFT_YELLOW )
                  End If

                    If Button_XYS.3 = 0 then
                            print "S" ;Push for Select
                              GLCDPrint(4, 60, "SELECT", TFT_RED )
                                End If

            If Button_AB.2 = 0 then
                  print "U"
                    GLCDPrint(4, 20, "UP", TFT_RED )
                          End If

            If Button_AB.3 = 0 then
              print "L"
                GLCDPrint(4, 30, "LEFT", TFT_RED )
                  End If

                    If Button_AB.4 = 0 then
                      print "D"
                        GLCDPrint(4, 40, "DOWN", TFT_RED )
                          End If

                        If Button_AB.7 = 0 then
                          print "R"
                            GLCDPrint(4, 50, "RIGHT", TFT_RED )
                              End If

[MBB]

I figured out most of this problem. The GLCD_RESET does not go directly to the GLCD. It goes to Pin 7 of the ATSAMD09D14A-MU chip that is on the GLCD board. Pin 7 which is labeled TFT_RST is an active low. I changed the HI2CSend 207 to HI2CSend 206. This puts a low on pin 7.

Now all the switches cause a read out on the display EXCEPT Button B which causes the display to go white and stay white even when other buttons are pressed.

[Anobium]

It sounds like you are getting there.

:=)