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Thread: changing bev channel # for jynx hd v 30

  1. #31
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    At88's use a pull-up resistor between sda and vcc.
    Found this info:

    When first powering up the device, five pulses are required on CLK-SCL for reading of internal registers. This can be
    accomplished by sending one full command byte to the device. The device will not respond but will then be ready to respond
    to the next correct command sequence.
    1. Power-up VCC,
    2. External pull-up resistor pulls I/O-SDA high with VCC,
    3. After stable VCC, five pulses are applied to CLK-SCL,
    4. CLK-SCL and I/O-SDA may be driven.

    The AT88 is connected the following way:
    pin4 to gnd
    pin5 (scl) to GPIO40
    pin6 (sda) is connected to GPIO45
    pin8 vcc

    From the source the only reference to those pins I could find was in "root.c":
    // Set GPIO40, 45 to GPIO mode, used for GPIO I2C
    #if defined(HW_SS830C)||defined(HW_SS830C2)
    *((unsigned long *)0xb8000088) = (*((unsigned long *)0xb8000088) & ~0x00000018) |0x00000018;
    #endif

    Then I found this also in root.c:
    /* Add ATMEL I2C GPIO Access */
    i2c_gpio_attach(3);

    #elif(SYS_MAIN_BOARD == BOARD_M3329E_DEMO01V01)
    i2c_scb_attach(1);
    i2c_gpio_attach(1);
    #else
    i2c_scb_attach(2);
    #endif

    #if(SYS_MAIN_BOARD == BOARD_M3329E_DEMO01V02)
    i2c_mode_set(I2C_TYPE_SCB, 40000, 1);
    i2c_mode_set(I2C_TYPE_SCB1, 40000, 1);
    #elif (SYS_MAIN_BOARD == BOARD_DB_M3602_02V01 || SYS_MAIN_BOARD == BOARD_DB_M3602_04V01)
    i2c_mode_set(I2C_TYPE_SCB, 100000, 1); // Nim for tuner 3501 0 j8
    i2c_mode_set(I2C_TYPE_SCB1, 23600, 1); // SCART alfred.wu为了适配MODEL2加密芯片进行的速度调整
    i2c_mode_set(I2C_FOR_EDDC, 100000, 1); // for HDMI
    i2c_mode_set(I2C_TYPE_GPIO2, 100000, 1); // for eeprom on SS830C(SMB.020.01)
    // i2c_mode_set(I2C_FOR_HDCP, 100000, 1); // for HDMI/HDCP
    // i2c_mode_set(I2C_FOR_NEWMINE, 100000, 1); // for NEWONE
    // i2c_mode_set(I2C_FOR_S3501S, 100000, 1); // Nim for tuner 3501 1 j2
    #else
    i2c_mode_set(I2C_TYPE_SCB, 40000, 1);
    i2c_mode_set(I2C_FOR_S3501, 40000, 1);
    #ifdef HDTV_SUPPORT
    i2c_mode_set(I2C_FOR_EDDC, 100000, 1); // for HDMI
    #endif

    Could they be using the at88 just to protect the HDCP key???? Every reference to the atmel I have found in the source code has HDCP and HDMI in there specially in libHDMI.a
    This is a small part of it:
    cm_ReadUserZone.o/
    cm_WriteUserZone.o/
    cm_SystemWrite.o/
    cm_VerifyCrypto.o/
    cm_SupportFuncs.o/
    cm_VerifyPassword.o/
    /0 1216185138 1004 513 100644 1620

    Below this at line 1866 we can find the AT88 plaintext references found in the unpacked maincode. INVALID_NUM_BYTES_2WRITE INVALID_NUM_BYTES_2READ Init Failed AT88SC0404C AT88SC0808C and so on.
    Last edited by Apex; 05-09-2017 at 07:47 PM.

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