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/**
******************************************************************************
* @file ymodem_daxia.c
* @author wjandsq@163.com
* @version V2.0.2
* @date 2014.12.06
* @brief Y-Modem 協(xié)議文件接收 (適用于ARM及X86平臺(tái))
******************************************************************************
* @copy
*
* Copyright (c) 2013-2014
*
*/
extern "C" {
#include "crc.h"
#include "crc16.h"
}
#ifndef STM32Fxxx
#include <stdint.h>
#include <stdbool.h>
#endif
#ifdef STM32Fxxx
// 發(fā)送字符串到USB端點(diǎn)(USB虛擬串口)
void VCP_MI_02_IN(uint8_t *buf, uint8_t count);
void VCP_MI_00_IN(uint8_t *buf, uint8_t count);
#else
// 發(fā)送字符串到串口1(發(fā)送完畢關(guān)閉串口1)
void SendStringWithClose(unsigned char * buf, unsigned short len);
#endif
uint16_t Y_Modem_CRC(uint8_t * buf, uint16_t len);
#define __IO volatile
/* Includes ------------------------------------------------------------------*/
//#include "ymodem_daxia.h"
#ifdef STM32Fxxx
#include "stm32_flash_read_write.h"
#include "usb_lib.h"
#endif
/* Extern function -----------------------------------------------------------*/
#ifdef STM32Fxxx
extern void NVIC_Configuration(void);
extern void NVIC_DISABLE(void);
extern void ChipHalInit(void);
#endif
/* Extern variables ----------------------------------------------------------*/
extern __IO uint8_t USART1_Tx_Buffer[];
extern __IO uint16_t USART1_TxLength;
extern __IO uint16_t USART1_TxCount;
extern __IO uint8_t USART1_Rx_Buffer [];
extern __IO uint8_t USART1_Rx_Buffer2[];
extern __IO uint32_t USART1_RxCount;
extern __IO uint16_t USART1_Rx_ptr_in;
extern __IO uint16_t Y_Modem_TMP1;
extern __IO uint16_t Over_Time_Cnt;
extern __IO uint32_t into_app_cnt;
extern uint16_t CRC16;
extern uint16_t CRC16_Tmp;
extern uint8_t FileName[];
extern uint32_t FileLength;
extern uint32_t Write_Counter;
extern __IO bool Flag_App_Rece_OK;
extern __IO bool Flag1_1Ms; // 系統(tǒng)定時(shí)器1MS標(biāo)志1
extern __IO bool Flag2_1Ms; // 系統(tǒng)定時(shí)器1MS標(biāo)志2
/* Private define ------------------------------------------------------------*/
#define MODEM_SOH 0x01 //133字節(jié)數(shù)據(jù)包類型，接收正常回應(yīng)0x06(含文件信息的第一個(gè)包接收正常需回應(yīng)0x06、0x43)
#define MODEM_STX 0x02 //1029字節(jié)數(shù)據(jù)包類型，接收正常回應(yīng)0x06
#define MODEM_EOT 0x04 //發(fā)送文件傳輸結(jié)束命令，接收正常回應(yīng)0x06、0x43(啟動(dòng)空包發(fā)送)
#define MODEM_ACK 0x06 //發(fā)送確認(rèn)應(yīng)答，接收方crc校驗(yàn)成功或收到已定義的命令
#define MODEM_NAK 0x15 //發(fā)送重傳當(dāng)前數(shù)據(jù)包請(qǐng)求，接收方crc校驗(yàn)出錯(cuò)
#define MODEM_CAN 0x18 //發(fā)送取消傳輸命令,連續(xù)發(fā)送5個(gè)字符
#define MODEM_C 0x43 //發(fā)送大寫字母C(三種情況下發(fā)送該字符: 1.啟動(dòng)通信握手.2.啟動(dòng)數(shù)據(jù)包發(fā)送.3.啟動(dòng)空包發(fā)送)
#define TIME_OVER_SETUP1 10000
#define TIME_OVER_SETUP2 30000
#ifdef STM32Fxxx
/*
函數(shù)功能: 大于或等于2K的程序數(shù)據(jù)，寫入Flash
小于2048不寫入，直接返回
*/
void Flash_Write_2K(void)
{
uint32_t tmp;
if(USART1_RxCount > Write_Counter){
tmp = USART1_RxCount - Write_Counter;
if(tmp >= 2048){
iap_write_appbin(FLASH_APP1_ADDR + Write_Counter, (uint8_t *)USART1_Rx_Buffer2, tmp);
Write_Counter += tmp;
}
}
}
/*
函數(shù)功能: 寫入小于或等于128字節(jié)的程序數(shù)據(jù)
若最后一個(gè)包小于1024字節(jié), 則發(fā)送128字節(jié)的數(shù)據(jù)包，以（SOH）開始
參數(shù)列表:
*/
void Flash_Write_128(void)
{
uint32_t tmp;
if(USART1_RxCount > Write_Counter){
tmp = USART1_RxCount - Write_Counter;
if(tmp <= 128){
iap_write_appbin(FLASH_APP1_ADDR + Write_Counter, (uint8_t *)USART1_Rx_Buffer2, tmp);
Write_Counter += tmp;
}
}
}
/* 虛擬串口MI_02接收監(jiān)控 */
void VCP_MI_02_IN (uint8_t *buf, uint8_t count){
USB_SIL_Write(EP4_IN, &buf[0], count);
SetEPTxValid(ENDP4);
}
/* 虛擬串口MI_00接收監(jiān)控 */
void VCP_MI_00_IN (uint8_t *buf, uint8_t count){
USB_SIL_Write(EP1_IN, &buf[0], count);
SetEPTxValid(ENDP1);
}
#endif
// 取消傳輸
void Cancel_Transmission(void)
{
uint8_t USB_IN_buf[5];
// 取消傳輸
USB_IN_buf[0] = MODEM_CAN;
USB_IN_buf[1] = MODEM_CAN;
USB_IN_buf[2] = MODEM_CAN;
USB_IN_buf[3] = MODEM_CAN;
USB_IN_buf[4] = MODEM_CAN;
#ifdef STM32Fxxx
USB_SIL_Write(EP4_IN, &USB_IN_buf[0], 5);
SetEPTxValid(ENDP4);
#else
#endif
}
// 回復(fù)確認(rèn)
void Send_ACK(void)
{
uint8_t USB_IN_buf[2];
// 回復(fù)確認(rèn)
USB_IN_buf[0] = MODEM_ACK;
#ifdef STM32Fxxx
USB_SIL_Write(EP4_IN, &USB_IN_buf[0], 1);
SetEPTxValid(ENDP4);
#endif
}
// 回復(fù)繼續(xù)
void Send_MODEM_C(void)
{
uint8_t USB_IN_buf[1];
USB_IN_buf[0] = MODEM_C;
#ifdef STM32Fxxx
USB_SIL_Write(EP4_IN, &USB_IN_buf[0], 1);
SetEPTxValid(ENDP4);
#endif
}
// 回復(fù)確認(rèn)、繼續(xù)
void Send_ACK_Continue(void)
{
uint8_t USB_IN_buf[2];
// 回復(fù)確認(rèn)、繼續(xù)
USB_IN_buf[0] = MODEM_ACK;
USB_IN_buf[1] = MODEM_C;
#ifdef STM32Fxxx
USB_SIL_Write(EP4_IN, &USB_IN_buf[0], 2);
SetEPTxValid(ENDP4);
#endif
}
/*
函數(shù)功能: 為實(shí)時(shí)響應(yīng), 需連續(xù)調(diào)用，以盡快處理Y_Modem協(xié)議接收的數(shù)據(jù)
參數(shù)列表:
Flag_Timer_1MS 系統(tǒng)1ms標(biāo)志傳入函數(shù), 但函數(shù)不對(duì)該標(biāo)志做改動(dòng)
Y_Modem_TMP1 全局變量
USART1_Rx_Buffer 4K byte 4K文件內(nèi)容接收緩沖
USART1_Rx_ptr_in USART1_Rx_Buffer 數(shù)據(jù)指針當(dāng)前位置
USART1_Rx_Buffer2 4K byte 4K文件內(nèi)容寫入Flash緩沖
USART1_RxCount USART1_Rx_Buffer2 數(shù)據(jù)指針當(dāng)前位置
*/
extern uint8_t Flag_App_Update;
static uint16_t temp_cnt;
static uint16_t temp_cnt2 = 0;
void Y_Modem_Receive(void)
{
uint32_t Y_Modem_TMP2;
uint32_t Y_Modem_TMP3;
uint32_t Y_Modem_TMP4;
uint32_t Y_Modem_TMP5;
uint8_t USB_IN_buf[5];
#ifndef STM32Fxxx
Flag2_1Ms = true;
#endif
switch(Y_Modem_TMP1){
case 0:
break;
case 1:
if(Flag2_1Ms == true){
Flag2_1Ms = false;
if(Flag_App_Update == 1){
// 更新標(biāo)志上電隨機(jī)設(shè)置為1或從用戶程序跳轉(zhuǎn)過來
// 上電隨機(jī)設(shè)置為1的情況不能啟動(dòng)，所以存在bug
}else{
// 更新標(biāo)志上電隨機(jī)設(shè)置為非零值
if (++temp_cnt2 > 200){
temp_cnt2 = 0;
Flag_App_Update = 0;
}
}
if (++temp_cnt > 2000){
temp_cnt = 0;
Send_MODEM_C();
#ifdef STM32Fxxx
USB_IN_buf[0] = *((uint8_t *)0x20004000);
VCP_MI_00_IN(&USB_IN_buf[0],1);
#endif
// 4K 緩沖清零
for(Y_Modem_TMP2 = 0; Y_Modem_TMP2 < 0x1000; ++Y_Modem_TMP2) {
USART1_Rx_Buffer[Y_Modem_TMP2] = 0;
USART1_Rx_Buffer2[Y_Modem_TMP2] = 0;
}
USART1_Rx_ptr_in = 0;
USART1_RxCount = 0;
Write_Counter = 0;
}
}
if(USART1_Rx_ptr_in > 0){
if(USART1_Rx_Buffer[0] == MODEM_SOH){
if(USART1_Rx_ptr_in >= 133){
Y_Modem_TMP1 = 2;
}
}
}
break;
case 2:
// 第2步，處理128字節(jié)數(shù)據(jù)塊(傳輸文件名，文件大小信息)
if(Flag2_1Ms == true){
Flag2_1Ms = false;
if (++Over_Time_Cnt > TIME_OVER_SETUP1){
Cancel_Transmission(); // 取消傳輸
Y_Modem_TMP1 = 0;
Over_Time_Cnt = 0;
#ifdef STM32Fxxx
USB_IN_buf[0] = 0x01;
VCP_MI_00_IN(&USB_IN_buf[0],1);
#endif
}
}
if(USART1_Rx_ptr_in > 0){
// 第2步，如果有數(shù)據(jù)傳輸，則進(jìn)行處理
// MODEM_SOH 128字節(jié)數(shù)據(jù)塊
if(USART1_Rx_Buffer[0] == MODEM_SOH){
if(USART1_Rx_ptr_in >= 133){
CRC16 = Y_Modem_CRC((uint8_t *)&USART1_Rx_Buffer[3], 128);
CRC16_Tmp = USART1_Rx_Buffer[131];
CRC16_Tmp = CRC16_Tmp << 8;
CRC16_Tmp |= USART1_Rx_Buffer[132];
if(CRC16_Tmp == CRC16){
// 獲取文件名
for(Y_Modem_TMP2 = 0; Y_Modem_TMP2 < 128; ++Y_Modem_TMP2) {
FileName[Y_Modem_TMP2] = 0;
}
Y_Modem_TMP3 = 0;
for(Y_Modem_TMP2 = 3; Y_Modem_TMP2 < 128; ) {
if(USART1_Rx_Buffer[Y_Modem_TMP2]!= 0){
FileName[Y_Modem_TMP3] = USART1_Rx_Buffer[Y_Modem_TMP2];
} else {
++Y_Modem_TMP2;
break;
}
++Y_Modem_TMP3;
++Y_Modem_TMP2;
}
// 獲取文件長(zhǎng)度
for(FileLength = 0; Y_Modem_TMP2 <= 133; ++Y_Modem_TMP2) {
if(USART1_Rx_Buffer[Y_Modem_TMP2]!= 0){
if((USART1_Rx_Buffer[Y_Modem_TMP2] >= 0x30)
&& (USART1_Rx_Buffer[Y_Modem_TMP2] <= 0x39)){
FileLength = FileLength * 10 + USART1_Rx_Buffer[Y_Modem_TMP2] - 0x30;
} else {
break;
}
} else {
break;
}
}
// STM32F103C8 只有64K 大于64K 則取消傳輸
if(FileLength > 1024 * 64){
Cancel_Transmission(); // 取消傳輸
Y_Modem_TMP1 = 0;
} else {
USART1_Rx_ptr_in = 0;
Send_ACK_Continue();
Over_Time_Cnt = 0;
Y_Modem_TMP1 = 3;
}
into_app_cnt = 0; // 延遲計(jì)數(shù)清0
}
}
}
}
break;
case 3:
// 第3步，接收并寫入程序數(shù)據(jù)，以2K的字節(jié)數(shù)據(jù)塊寫入
if(Flag2_1Ms == true){
Flag2_1Ms = false;
if (++Over_Time_Cnt > TIME_OVER_SETUP2){
Cancel_Transmission(); // 取消傳輸
Y_Modem_TMP1 = 0;
into_app_cnt = 0; // 延遲計(jì)數(shù)清0
}
}
if(USART1_Rx_ptr_in > 0){
// MODEM_STX 1029字節(jié)數(shù)據(jù)塊
if(USART1_Rx_Buffer[0] == MODEM_STX){
// 最后一包數(shù)據(jù)包大于128且小于1024字節(jié)時(shí)，補(bǔ)充以0x1A
if(USART1_Rx_ptr_in >= 1029){
CRC16 = Y_Modem_CRC((uint8_t *)&USART1_Rx_Buffer[3], 1024);
CRC16_Tmp = USART1_Rx_Buffer[1027];
CRC16_Tmp = CRC16_Tmp << 8;
CRC16_Tmp |= USART1_Rx_Buffer[1028];
if(CRC16_Tmp == CRC16){
Y_Modem_TMP5 = USART1_RxCount - Write_Counter;
for(Y_Modem_TMP2 = 0; Y_Modem_TMP2 < 1024; ++Y_Modem_TMP2) {
Y_Modem_TMP4 = USART1_RxCount;
Y_Modem_TMP4 = Y_Modem_TMP4 + Y_Modem_TMP2;
if(Y_Modem_TMP4 < FileLength){
USART1_Rx_Buffer2[Y_Modem_TMP5++] = USART1_Rx_Buffer[Y_Modem_TMP2+3];
}else{
// 最后一個(gè)數(shù)據(jù)包大于128且小于1024字節(jié)時(shí)，補(bǔ)充的0x1A不復(fù)制，退出循環(huán)
break;
}
USART1_Rx_Buffer[Y_Modem_TMP2] = 0;
}
USART1_RxCount += Y_Modem_TMP2;
#ifdef STM32Fxxx
Flash_Write_2K(); // USART1_RxCount - Write_Counter < 2048, 調(diào)用該函數(shù)無效
#endif
for(; Y_Modem_TMP2 <= 1029; ++Y_Modem_TMP2) {
USART1_Rx_Buffer[Y_Modem_TMP2] = 0;
}
USART1_Rx_ptr_in = 0;
Send_ACK(); // 回復(fù)確認(rèn)
into_app_cnt = 0; // 延遲計(jì)數(shù)清0
}else{
// 出現(xiàn)CRC錯(cuò)誤
}
}
}
// MODEM_SOH 133字節(jié)數(shù)據(jù)塊
if(USART1_Rx_Buffer[0] == MODEM_SOH){
// 最后一包數(shù)據(jù)不足128字節(jié)時(shí)，補(bǔ)充以0x1A，總計(jì)補(bǔ)滿133字節(jié)
if(USART1_Rx_ptr_in >= 133){
CRC16 = Y_Modem_CRC((uint8_t *)&USART1_Rx_Buffer[3], 128);
CRC16_Tmp = USART1_Rx_Buffer[131];
CRC16_Tmp = CRC16_Tmp << 8;
CRC16_Tmp |= USART1_Rx_Buffer[132];
if(CRC16_Tmp == CRC16){
Y_Modem_TMP5 = USART1_RxCount - Write_Counter;
for(Y_Modem_TMP2 = 0; Y_Modem_TMP2 < 128; ++Y_Modem_TMP2) {
Y_Modem_TMP4 = USART1_RxCount;
Y_Modem_TMP4 += Y_Modem_TMP2;
if(Y_Modem_TMP4 < FileLength){
USART1_Rx_Buffer2[Y_Modem_TMP5++] = USART1_Rx_Buffer[Y_Modem_TMP2+3];
}else{
break;
}
USART1_Rx_Buffer[Y_Modem_TMP2] = 0;
}
USART1_RxCount += Y_Modem_TMP2;
#ifdef STM32Fxxx
Flash_Write_128();
#endif
for(; Y_Modem_TMP2 <= 133; ++Y_Modem_TMP2) {
USART1_Rx_Buffer[Y_Modem_TMP2] = 0;
}
USART1_Rx_ptr_in = 0;
Send_ACK(); // 回復(fù)確認(rèn)
into_app_cnt = 0; // 延遲計(jì)數(shù)清0
}
}
}
// 文件傳輸結(jié)束命令
if(USART1_Rx_Buffer[0] == MODEM_EOT){
// 文件傳輸結(jié)束
if(FileLength == USART1_RxCount){
Flag_App_Rece_OK = true;
}
USART1_Rx_ptr_in = 0;
Send_ACK_Continue(); // 回復(fù)確認(rèn)、繼續(xù)
Y_Modem_TMP1 = 4;
into_app_cnt = 0; // 延遲計(jì)數(shù)清0
}
// 取消傳輸命令
if(USART1_Rx_Buffer[0] == MODEM_CAN){
// 取消傳輸
for(Y_Modem_TMP2 = 0; Y_Modem_TMP2 <= 1029; ++Y_Modem_TMP2) {
USART1_Rx_Buffer[Y_Modem_TMP2] = 0;
}
USART1_Rx_ptr_in = 0;
Y_Modem_TMP1 = 4;
into_app_cnt = 0; // 延遲計(jì)數(shù)清0
}
}
break;
case 4:
if(Flag2_1Ms == true){
Flag2_1Ms = false;
if (++Over_Time_Cnt > TIME_OVER_SETUP1){
Cancel_Transmission(); // 取消傳輸
Y_Modem_TMP1 = 0;
into_app_cnt = 0; // 延遲計(jì)數(shù)清0
}
}
// MODEM_SOH 133字節(jié)數(shù)據(jù)塊
if(USART1_Rx_Buffer[0] == MODEM_SOH){
// 最后一包數(shù)據(jù)不足128字節(jié)時(shí)，補(bǔ)充以0x1A，總計(jì)補(bǔ)滿133字節(jié)
if(USART1_Rx_ptr_in >= 133){
// 最后一個(gè)空數(shù)據(jù)包，133字節(jié)，前3個(gè)字節(jié)是01 00 FF，其余是0
CRC16_Tmp = 0;
for(Y_Modem_TMP2 = 3; Y_Modem_TMP2 <= 133; ++Y_Modem_TMP2) {
CRC16_Tmp += USART1_Rx_Buffer[Y_Modem_TMP2];
}
if(CRC16_Tmp==0){
if(Flag_App_Rece_OK){
// 未寫完的程序數(shù)據(jù)寫入，[1-128) OR [1024,2048)
if(FileLength > Write_Counter){
Y_Modem_TMP4 = FileLength - Write_Counter;
if(Y_Modem_TMP4){
#ifdef STM32Fxxx
iap_write_appbin(FLASH_APP1_ADDR + Write_Counter, (uint8_t *)USART1_Rx_Buffer2, Y_Modem_TMP4);
#endif
Write_Counter += Y_Modem_TMP4;
}
}
}
Send_ACK(); // 回復(fù)確認(rèn)，結(jié)束文件傳輸
Y_Modem_TMP1 = 5; // 文件傳輸結(jié)束
}
into_app_cnt = 0; // 延遲計(jì)數(shù)清0
}
}
break;
case 5:
if(Flag2_1Ms == true){
Flag2_1Ms = false;
#ifndef STM32Fxxx
if (++Over_Time_Cnt > 500){
#else
if (++Over_Time_Cnt > 5000){
#endif
Over_Time_Cnt = 0;
Y_Modem_TMP1 = 0;
into_app_cnt = 0; // 延遲5秒
}
}
break;
default:
#ifdef STM32Fxxx
__NOP();
__NOP();
__NOP();
#endif
break;
}
}
/*
一、Ymodem通信發(fā)送數(shù)據(jù)包的說明
1 Ymodem通信數(shù)據(jù)包的格式
數(shù)據(jù)包的格式是: 類型 + 序號(hào) + 序號(hào)反碼 + 數(shù)據(jù)區(qū)(128或1024) + 校驗(yàn)和(兩字節(jié))
2 Ymodem通信數(shù)據(jù)包的序號(hào)增長(zhǎng)規(guī)律
數(shù)據(jù)包的序號(hào)從00開始直到255，然后又從00開始。不大于255K字節(jié)的數(shù)據(jù)包，所有發(fā)送數(shù)據(jù)包的
序號(hào)是唯一的。大于255K的數(shù)據(jù)包，按照1K字節(jié)分包，第一個(gè)數(shù)據(jù)包序號(hào)是1，第二個(gè)數(shù)據(jù)包的序號(hào)是2
。。。第255個(gè)數(shù)據(jù)包的序號(hào)是255，第256個(gè)數(shù)據(jù)包的序號(hào)，又從0開始。
3 Ymodem通信的大小數(shù)據(jù)包
Ymodem通信有128字節(jié)和1024字節(jié)兩種類型的數(shù)據(jù)包，數(shù)據(jù)包開頭有3字節(jié)(類型+ 序號(hào)+序號(hào)反碼),
末尾crc16是2個(gè)字節(jié)，所以可以說有133字節(jié)的小數(shù)據(jù)包和1029字節(jié)的大數(shù)據(jù)包。
(1)133字節(jié)數(shù)據(jù)包的特點(diǎn)、字符填充規(guī)則
以SOH(0x01)開始的數(shù)據(jù)包，數(shù)據(jù)區(qū)是128字節(jié)。發(fā)送端第一個(gè)含有文件信息的數(shù)據(jù)包是3+128+2 = 133字節(jié)。
發(fā)送最后一個(gè)數(shù)據(jù)包時(shí)，剩余數(shù)據(jù)字節(jié)數(shù)若小于128，則以0x1A填充，仍發(fā)送133字節(jié)數(shù)據(jù)包。
(2)1029字節(jié)數(shù)據(jù)包的特點(diǎn)、字符填充規(guī)則
以STX(0x02)開始的數(shù)據(jù)包，數(shù)據(jù)區(qū)是1024字節(jié)。若發(fā)送的文件大于1024字節(jié)，文件信息包之后的第一個(gè)
數(shù)據(jù)包則為1029字節(jié)，隨后剩余的數(shù)據(jù)若不小于1024字節(jié)，則均以1029大數(shù)據(jù)包發(fā)送。
4 處理Ymodem通信最后一個(gè)數(shù)據(jù)包時(shí)，需要考慮的情況
Ymodem通信按照1024字節(jié)分包，最后一個(gè)數(shù)據(jù)包的大小不會(huì)超過1024字節(jié)。編程時(shí)需要考慮以下幾種情況:
(1)數(shù)據(jù)個(gè)數(shù)等于1024字節(jié)，按1029字節(jié)發(fā)送。
(2)數(shù)據(jù)個(gè)數(shù)小于1024字節(jié)，但大于128字節(jié)，按1029字節(jié)發(fā)送，無效數(shù)據(jù)區(qū)域以0x1A字符填充。
(3)數(shù)據(jù)個(gè)數(shù)等于128字節(jié)，按133字節(jié)發(fā)送。
(4)數(shù)據(jù)個(gè)數(shù)小于128字節(jié)，按133字節(jié)發(fā)送，無效數(shù)據(jù)區(qū)域以0x1A字符填充。
二、Ymodem通信crc16計(jì)算說明:
1 小包3 + 128 字節(jié)，大包 3 + 1024字節(jié)，末尾2字節(jié)是crc16。
2 crc16計(jì)算從第4字節(jié)開始(不包括SOH(0x01) 序號(hào) 序號(hào)反碼三字節(jié))，
小包計(jì)算長(zhǎng)度128字節(jié)，大包計(jì)算長(zhǎng)度1024字節(jié)
3 最后一個(gè)空包,除前三字節(jié)外全是0，末尾2個(gè)字節(jié)也是0，不用計(jì)算crc16。
三、Ymodem通信命令說明
#define MODEM_SOH 0x01 //133字節(jié)數(shù)據(jù)包類型，接收正常回應(yīng)0x06(含文件信息的第一個(gè)包接收正常需回應(yīng)0x06、0x43)
#define MODEM_STX 0x02 //1029字節(jié)數(shù)據(jù)包類型，接收正常回應(yīng)0x06
#define MODEM_EOT 0x04 //發(fā)送文件傳輸結(jié)束命令，接收正常回應(yīng)0x06、0x43(啟動(dòng)空包發(fā)送)
#define MODEM_ACK 0x06 //發(fā)送確認(rèn)應(yīng)答，接收方crc校驗(yàn)成功或收到已定義的命令
#define MODEM_NAK 0x15 //發(fā)送重傳當(dāng)前數(shù)據(jù)包請(qǐng)求，接收方crc校驗(yàn)出錯(cuò)
#define MODEM_CAN 0x18 //發(fā)送取消傳輸命令,連續(xù)發(fā)送5個(gè)字符
#define MODEM_C 0x43 //發(fā)送大寫字母C(三種情況下發(fā)送該字符: 1.啟動(dòng)通信握手.2.啟動(dòng)數(shù)據(jù)包發(fā)送.3.啟動(dòng)空包發(fā)送)
*/
uint16_t Y_Modem_CRC(uint8_t * buf, uint16_t len)
{
uint16_t chsum;
uint16_t stat;
uint16_t i;
uint8_t * in_ptr;
//指向要計(jì)算CRC的緩沖區(qū)開頭
in_ptr = buf;
chsum = 0;
for (stat = len ; stat > 0; stat--) //len是所要計(jì)算的長(zhǎng)度
{
chsum = chsum^(uint16_t)(*in_ptr++) << 8;
for (i=8; i!=0; i--) {
if (chsum & 0x8000){
chsum = chsum << 1 ^ 0x1021;
} else {
chsum = chsum << 1;
}
}
}
return chsum;
}
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