modify pic32mz usart library in 9bits transmitter

When using the library function PLIB_USART_Transmitter9BitsSend (USART_MODULE_ID index, int8_t data, bool Bit9th) were 9-bit mode to send data, if the parameter data of bit7 bit is 1, even Bit9th value false, but observed on the TX pin timing display bit9 bit is 1, and the receiver indeed receives the address bit is 1. The parameter data corresponding real parameter data type is defined as unsigned char or signed char, the problem still exists; No single step through the program logic problems.
To solve the problem, simply call the function directly modify its
PLIB_TEMPLATE void USART_Transmitter9BitsSend_InDataOnly (USART_MODULE_ID index, int8_t data, bool Bit9th)
{
    SFR_TYPE temp;
        if (Bit9th == 0)
        {
                    // _ SFR_WRITE (_USART_TRANSMITTER_DATA_ONLY_VREG (index), data);
        temp = data;
                    temp = temp & 0x0ff;
                    _SFR_WRITE (_USART_TRANSMITTER_DATA_ONLY_VREG (Index), temp);
        }
        else
        {
                    temp = data;
                    temp = (temp | (Bit9th << 8));
                    _SFR_WRITE (_USART_TRANSMITTER_DATA_ONLY_VREG (Index), temp);
        }
}
The issue is resolved after the above modifications. Because the chip is not clear assembly instructions, did not see the original library functions compiled assembly code.