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ARM: Hard Fault at send and receive simultaneously with USART & Ethernet (2 Replies)

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Hello Here is my circuit diagram http://obrazki.elektroda.pl/3624808600_1477118608.jpg Here is my program volatile unsigned char flagSerial; volatile unsigned char flagEthernet; volatile unsigned char bitpos1; volatile unsigned char endbitpos1; volatile unsigned char stat1; volatile unsigned char SendSerial; volatile unsigned char temp; volatile unsigned char bufferu1[200]; volatile unsigned char buffer1[200]; unsigned char pc[100]; int32_t socket; uint8_t *sendbuf;

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