cardvcc_read
TXREADPTR_GET_PTR(cardvcc_read(lvcc, vcc_txreadptr)));
endptr = TXREADPTR_GET_PTR(cardvcc_read(lvcc, vcc_txreadptr));
write = TXWRITEPTR_GET_PTR(cardvcc_read(lvcc, vcc_txwriteptr));
read = TXREADPTR_GET_PTR(cardvcc_read(lvcc, vcc_txreadptr));
(cardvcc_read(lvcc, vcc_txcbr_next) &