W5100 can't send a zero

Question

Hello everybody, I have a problem with mit w5100. I want to send a byte array look like this uint8_t data[8] = {0x62, 0xC8, 0x03, 0xC8, 0x00, 0x43, 0xC8, 0x00}; And now there is the problem, when I send this array the first 4 bytes were send, but after 0x00 all position wont be send. Do I have to escape this 0x00? Does anyone know how I can fix the problem? greetings

suhwan · Answer

Hi oadna, W5100 can send a zero (0x00). Please, check data length, data copy or updating Sn_TX_WR in your code. Reference Code is [url]http://www.wiznet.co.kr/sub_modules/kr/product/product_detail.asp?Refid=677&page=1&cate1=5&cate2=7&cate3=26&pid=1019&cType=2[/url]. uint16 send( SOCKET s, /**< the socket index */ const uint8 * buf, /**< a pointer to data */ uint16 len /**< the data size to be send */ ) { uint8 status=0; uint16 ret=0; uint16 freesize=0; if (len > getIINCHIP_TxMAX(s)) ret = getIINCHIP_TxMAX(s); // check size not to exceed MAX size. else ret = len; // if freebuf is available, start. do { freesize = getSn_TX_FSR(s); status = IINCHIP_READ(Sn_SR(s)); if ((status != SOCK_ESTABLISHED) && (status != SOCK_CLOSE_WAIT)) { ret = 0; break; } } while (freesize < ret); // copy data send_data_processing(s, (uint8 *)buf, ret); IINCHIP_WRITE(Sn_CR(s),Sn_CR_SEND); /* +20071122[chungs]:wait to process the command... */ while( IINCHIP_READ(Sn_CR(s)) ) ; /* ------- */ #ifdef __DEF_IINCHIP_INT__ while ( (getISR(s) & Sn_IR_SEND_OK) != Sn_IR_SEND_OK ) #else while ( (IINCHIP_READ(Sn_IR(s)) & Sn_IR_SEND_OK) != Sn_IR_SEND_OK ) #endif { /* m2008.01 [bj] : reduce code */ if ( IINCHIP_READ(Sn_SR(s)) == SOCK_CLOSED ) { #ifdef __DEF_IINCHIP_DBG__ printf("SOCK_CLOSED. "); #endif close(s); return 0; } } #ifdef __DEF_IINCHIP_INT__ putISR(s, getISR(s) & (~Sn_IR_SEND_OK)); #else IINCHIP_WRITE(Sn_IR(s), Sn_IR_SEND_OK); #endif return ret; } void send_data_processing(SOCKET s, uint8 *data, uint16 len) { uint16 ptr; /* read Sn_TX_WritePointer */ ptr = IINCHIP_READ(Sn_TX_WR0(s)); ptr = ((ptr & 0x00ff) << 8) + IINCHIP_READ(Sn_TX_WR0(s) + 1); write_data(s, data, (uint8 *)(ptr), len); ptr += len; /* update Sn_TX_WritePointer */ IINCHIP_WRITE(Sn_TX_WR0(s),(uint8)((ptr & 0xff00) >> 8)); IINCHIP_WRITE((Sn_TX_WR0(s) + 1),(uint8)(ptr & 0x00ff)); } Thanks

oadna · Answer

he, thanks for your reply. I have tried it again and again, but it doesn`t work. When i remove the 0x00 from the array, the whole array will be sent. This is so crazy. greets

suhwan · Answer

Hi oadna, Please, attach your code. We will review the code. Thanks,

oadna · Answer

Hello I attached the file, I hope you can find the error. Thank you. WebClient.c (17.4 KB)

suhwan · Answer

Hi oadna, We may find the error. :0 strlen size_t strlen ( const char * str ); Get string length Returns the length of the C string str. The length of a C string is determined by the terminating null-character So, your code should be change, as below replace ‘strlen’ to ‘sizeof’ input data length directly /* your code */ uint8_t data[8] = {0x62, 0xC8, 0x03, 0xC8, 0x00, 0x43, 0xC8, 0x00}; uint8_t end[2]; sprintf((char *) end, "
"); if (send(sockreg,data,strlen((char *)data)) <= 0) break; //send data <= here printf((char *)data); _delay_ms(100); if (send(sockreg,end,strlen((char *)end)) <= 0) break; //send end <= here _delay_ms(1000); /*fix code*/ //if (send(sockreg,data, sizeof((char *)data)) <= 0) break; //send data if (send(sockreg,data, 8)) <= 0) break; //send data printf((char *)data); _delay_ms(100); //if (send(sockreg,end, sizeof((char *)end)) <= 0) break; //send end if (send(sockreg,end, 2)) <= 0) break; //send end _delay_ms(1000); Thanks Thanks,

oadna · Answer

hi suhwan, You helped me so much, thank you a lot. Now my thesis is save. greets