/*
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* Copyright (c) 2020-2025 Shanghai Panchip Microelectronics Co.,Ltd.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "soc_api.h"
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#include "app_log.h"
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#include "uart_dfu.h"
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#include "pan_uart.h"
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#include "flash_manager.h"
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#define XMODEM_UART UART0
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#define BAUDRATE 921600
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#define SOH 0x01
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#define STX 0x02
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#define EOT 0x04
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#define ACK 0x06
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#define NAK 0x15
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#define CAN 0x18
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#define CTRLZ 0x1A
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#define DLY_1S 2000
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#define MAXRETRANS 25
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static const unsigned short crc16_tab[256] = {
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0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
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0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
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0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
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0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
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0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
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0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
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0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
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0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
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0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
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0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
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0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
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0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
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0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
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0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
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0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
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0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
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0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
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0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
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0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
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0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
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0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
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0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
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0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
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0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
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0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
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0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
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0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
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0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
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0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
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0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
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0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
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0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0};
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static unsigned short crc16_ccitt(const unsigned char *xbuff, int len)
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{
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register int i;
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register unsigned short CRC = 0x00;
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for (i = 0; i < len; i++)
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{
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CRC = (CRC << 8) ^ crc16_tab[((CRC >> 8) ^ *xbuff++) & 0xff];
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}
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return CRC;
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}
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static void _outbyte(int c)
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{
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while (UART_IsTxFifoFull(XMODEM_UART));
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XMODEM_UART->RBR_THR_DLL = c;
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}
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void outbyte(int c)
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{
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static char prev = 0;
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if (c < ' ' && c != '\r' && c != '\n' && c != '\t' && c != '\b')
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return;
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if (c == '\n' && prev != '\r')
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_outbyte('\r');
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_outbyte(c);
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prev = c;
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}
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static int _inbyte(unsigned short timeout)
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{
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unsigned short c;
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uint32_t timeoutt;
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timeoutt = ((uint32_t)timeout) << 6;
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while (1)
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{
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if ((XMODEM_UART->USR & UART_USR_RFNE_Msk))
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{
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break;
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}
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timeoutt--;
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if (timeoutt == 0)
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{
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return -2;
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}
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}
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c = XMODEM_UART->RBR_THR_DLL;
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return c;
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}
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static int check(int crc, const unsigned char *buf, int sz)
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{
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if (crc)
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{
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unsigned short crc = crc16_ccitt(buf, sz);
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unsigned short tcrc = (buf[sz] << 8) + buf[sz + 1];
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if (crc == tcrc)
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return 1;
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}
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else
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{
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int i;
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unsigned char cks = 0;
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for (i = 0; i < sz; ++i)
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{
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cks += buf[i];
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}
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if (cks == buf[sz])
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return 1;
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}
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return 0;
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}
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CONFIG_RAM_CODE int xmodemReceive(uint32_t addr)
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{
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unsigned char xbuff[1030]; /* 1024 for XModem 1k + 3 head chars + 2 crc + nul */
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unsigned char *p;
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int bufsz, crc = 0;
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unsigned char trychar = 'C';
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unsigned char packetno = 1;
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int i, c, len = 0;
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uint32_t dfu_addr;
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int retry, retrans = MAXRETRANS;
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dfu_addr = addr;
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for (; ;)
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{
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for (retry = 0; retry < 2; ++retry)
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{
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if (trychar)
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_outbyte(trychar);
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if ((c = _inbyte((DLY_1S) << 1)) >= 0)
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{
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switch (c)
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{
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case SOH:
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bufsz = 128;
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goto start_recv;
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case STX:
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bufsz = 1024;
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goto start_recv;
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case EOT:
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_outbyte(ACK);
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return len; /* normal end */
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case CAN:
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if ((c = _inbyte(DLY_1S)) == CAN)
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{
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_outbyte(ACK);
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return -1; /* canceled by remote */
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}
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break;
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default:
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break;
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}
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}
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}
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if (trychar == 'C')
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{
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trychar = NAK;
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continue;
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}
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_outbyte(CAN);
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_outbyte(CAN);
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_outbyte(CAN);
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return -2; /* sync error */
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start_recv:
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if (trychar == 'C')
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crc = 1;
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trychar = 0;
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p = xbuff;
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*p++ = c;
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for (i = 0; i < (bufsz + (crc ? 1 : 0) + 3); ++i)
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{
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if ((c = _inbyte(DLY_1S)) < 0)
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goto reject;
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*p++ = c;
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}
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if (xbuff[1] == (unsigned char)(~xbuff[2]) &&
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(xbuff[1] == packetno || xbuff[1] == (unsigned char)packetno - 1) &&
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check(crc, &xbuff[3], bufsz))
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{
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if (xbuff[1] == packetno)
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{
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fm_write_flash(dfu_addr + len, &xbuff[3], bufsz);
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}
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len += bufsz;
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++packetno;
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retrans = MAXRETRANS + 1;
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if (--retrans <= 0)
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{
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_outbyte(CAN);
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_outbyte(CAN);
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_outbyte(CAN);
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return -3; /* too many retry error */
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}
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_outbyte(ACK);
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continue;
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}
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reject:
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_outbyte(NAK);
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}
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}
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#if FALSE
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int xmodemTransmit(unsigned char *src, int srcsz)
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{
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unsigned char xbuff[1030]; /* 1024 for XModem 1k + 3 head chars + 2 crc + nul */
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int bufsz, crc = -1;
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unsigned char packetno = 1;
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int i, c, len = 0;
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int retry;
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for (;;)
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{
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for (retry = 0; retry < 16; ++retry)
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{
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if ((c = _inbyte((DLY_1S) << 1)) >= 0)
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{
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switch (c)
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{
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case 'C':
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crc = 1;
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goto start_trans;
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case NAK:
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crc = 0;
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goto start_trans;
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case CAN:
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if ((c = _inbyte(DLY_1S)) == CAN)
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{
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_outbyte(ACK);
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return -1; /* canceled by remote */
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}
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break;
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default:
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break;
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}
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}
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}
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_outbyte(CAN);
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_outbyte(CAN);
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_outbyte(CAN);
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return -2; /* no sync */
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for (;;)
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{
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start_trans:
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xbuff[0] = SOH;
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bufsz = 128;
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xbuff[1] = packetno;
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xbuff[2] = ~packetno;
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c = srcsz - len;
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if (c > bufsz)
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c = bufsz;
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if (c >= 0)
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{
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memset(&xbuff[3], 0, bufsz);
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if (c == 0)
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{
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xbuff[3] = CTRLZ;
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}
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else
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{
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memcpy(&xbuff[3], &src[len], c);
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if (c < bufsz)
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xbuff[3 + c] = CTRLZ;
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}
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if (crc)
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{
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unsigned short ccrc = crc16_ccitt(&xbuff[3], bufsz);
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xbuff[bufsz + 3] = (ccrc >> 8) & 0xFF;
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xbuff[bufsz + 4] = ccrc & 0xFF;
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}
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else
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{
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unsigned char ccks = 0;
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for (i = 3; i < bufsz + 3; ++i)
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{
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ccks += xbuff[i];
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}
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xbuff[bufsz + 3] = ccks;
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}
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for (retry = 0; retry < MAXRETRANS; ++retry)
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{
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for (i = 0; i < bufsz + 4 + (crc ? 1 : 0); ++i)
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{
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_outbyte(xbuff[i]);
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}
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if ((c = _inbyte(DLY_1S)) >= 0)
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{
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switch (c)
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{
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case ACK:
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++packetno;
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len += bufsz;
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goto start_trans;
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case CAN:
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if ((c = _inbyte(DLY_1S)) == CAN)
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{
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_outbyte(ACK);
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return -1; /* canceled by remote */
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}
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break;
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case NAK:
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default:
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break;
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}
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}
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}
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_outbyte(CAN);
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_outbyte(CAN);
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_outbyte(CAN);
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return -4; /* xmit error */
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}
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else
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{
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for (retry = 0; retry < 10; ++retry)
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{
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_outbyte(EOT);
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if ((c = _inbyte((DLY_1S) << 1)) == ACK)
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break;
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}
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return (c == ACK) ? len : -5;
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}
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}
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}
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}
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#endif
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static void uart_device_init(void)
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{
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CLK_AHBPeriphClockCmd(CLK_AHBPeriph_APB1, ENABLE);
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CLK_APB1PeriphClockCmd(CLK_APB1Periph_UART0, ENABLE);
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SYS_SET_MFP(P1, 6, UART0_TX);
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SYS_SET_MFP(P1, 7, UART0_RX);
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GPIO_EnableDigitalPath(P1, BIT7);
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UART_InitTypeDef Init_Struct;
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Init_Struct.UART_BaudRate = BAUDRATE;
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Init_Struct.UART_LineCtrl = Uart_Line_8n1;
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/* Init UART0 for printf */
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UART_Init(UART0, &Init_Struct);
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UART_EnableFifo(UART0);
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UART_ResetRxFifo(UART0);
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}
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void on_uart_dfu_enter(void)
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{
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int rc;
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#if APP_LOG_EN
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APP_LOG_INFO("Entering UART DFU flow..\n");
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soc_busy_wait(10000); // Wait for print done
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#endif
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fm_status_refresh(); /* clear flash manager for a new ota process */
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uart_device_init();
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while (1) {
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rc = xmodemReceive(FLASH_AREA_IMAGE_START);
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if (rc > 1024) { /* receive image info */
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if (!fm_image_completed_check(FLASH_AREA_IMAGE_START)) { /* check image */
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fm_image_make_invalid(FLASH_AREA_IMAGE_START);
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}
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SYS_UnlockReg();
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CLK_ResetChip();
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}
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SYS_delay_10nop(1000000);
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}
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}
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