W5500 - TX_WR pointer math

Question

Hello all: I would like to understand the way W5500 handles TX_WR pointer. I read the pointer twice: Once at wiz_send_data() routine and once after send() rutine; I expect that when reading it at the second time it will be larger by the len value, added to it before executing the send command. I found that when it becomes larger than 0xFF it always shows the upper byte as 0x00!! Example: len = 0x9C TX_WR = 0x0091 //before send() TX_WR =0x002D //second reading-expecting it to be 0x012D Why TX_WR is not 0x012D after send()? (it is 16 bits pointer…) Might be printf() problem… Any idea? Thanks Dan

bangbh · Answer

Hello I tested like the picture below. I don’t know exactly how many bytes I sent, but I seems work fine. Thanks.