Function mraa_sys::mraa_uart_write

pub unsafe extern "C" fn mraa_uart_write(
    dev: mraa_uart_context, 
    buf: *const c_char, 
    length: usize
) -> c_int

Write bytes in buffer to a device

@param dev uart context @param buf buffer pointer @param length maximum size of buffer @return the number of bytes written, or -1 if an error occurred