Clearing JTAGEN bit of FCID when programming PIC32MM

[lepermunna]

Hi, thanks for this excellent project.

Please note that per section 16.3 of the PIC32MM Families reference (http://ww1.microchip.com/downloads/en/DeviceDoc/60001364d.pdf), special steps are required to clear the JTAGEN bit in the FCID and AFCID configuration words.

The following change to pickit_program_double_word in adapter-pickit2.c seems to work:

    /* Use PE to write flash memory. */
    pickit_send(a, 33, CMD_CLEAR_UPLOAD_BUFFER,
        CMD_EXECUTE_SCRIPT, 29,
            SCRIPT_JT2_SENDCMD, ETAP_FASTDATA,
            SCRIPT_JT2_XFRFASTDAT_LIT,
                0, 0, PE_DOUBLE_WORD_PGRM, 0,
            SCRIPT_JT2_XFRFASTDAT_LIT,
                (unsigned char) addr,
                (unsigned char) (addr >> 8),
                (unsigned char) (addr >> 16),
                (unsigned char) (addr >> 24),
            SCRIPT_JT2_XFRFASTDAT_LIT,
                (unsigned char) word0,
                (unsigned char) (word0 >> 8),
                (unsigned char) (word0 >> 16),
                (unsigned char) (word0 >> 24),
            SCRIPT_JT2_XFRFASTDAT_LIT,
                (unsigned char) word1,
                (unsigned char) (word1 >> 8),
                (unsigned char) (word1 >> 16),
                (unsigned char) (word1 >> 24),
           SCRIPT_JT2_SENDCMD, TAP_SW_MTAP,
           SCRIPT_DELAY_SHORT, 23,
           SCRIPT_JT2_SENDCMD, TAP_SW_ETAP,
           SCRIPT_JT2_GET_PE_RESP,
        CMD_UPLOAD_DATA);

Tested using PicKit3 with PIC32MM0064GPL036