ymodem.c
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#include "ymodem.h"
#include "string.h"
#include "stdlib.h"
#include "flash.h"
#include "usart1.h"
#include "uart5.h"
#include "delay.h"
USART_TypeDef * IAP_Port = UART5;
uint8_t FileName[FILE_NAME_LENGTH];//array to store filename of download *.bin
char file_size[FILE_SIZE_LENGTH];
uint8_t buf_1k[1024] ={0};
/********************************************/
//移植的时候,由于函数定义了局部大数组，需要修改堆栈的大小。
//下面是需要移植的函数
static uint32_t SerialKeyPressed(uint8_t *key);
static int32_t Receive_Byte(uint8_t *c, uint32_t timeout);
int32_t Ymodem_Receive (uint8_t *buf, uint32_t appaddr);
uint32_t STM_FLASH_Erase(uint32_t addrx);
uint32_t STM_FLASH_Get_Block_Size(uint32_t addrx);
uint32_t STMFLASH_Write(u32 WriteAddr,u32 *pBuffer,u32 NumToWrite);
/********************************************/
//check if one byte rx successfully
//key: variabl to store rx data
//return: 1=success, 0=fail
static uint32_t SerialKeyPressed(uint8_t *key)
{
if(IAP_Port == UART5)
{
return uart5_read_byte(key);
}
else
{
return usart1_read_byte(key);
}
}
//Rx a byte from sender
//c: variable to store data
//timeout: read time out
//return: 0=success, -1=fail
static int32_t Receive_Byte (uint8_t *c, uint32_t timeout)
{
while (timeout-- > 0)
{
if (SerialKeyPressed(c) == 1)
{
return 0;
}
}
return -1;
}
//send a byte via IAP_Port
//c: byte to send
//return: 0
static uint32_t Send_Byte (uint8_t c)
{
if(IAP_Port == UART5)
{
uart5_send_byte(c);
}
else
{
usart1_send_byte(c);
}
return 0;
}
/**
* @brief Update CRC16 for input byte
* @param crc_in input value
* @param input byte
* @retval None
*/
uint16_t UpdateCRC16(uint16_t crc_in, uint8_t byte)
{
uint32_t crc = crc_in;
uint32_t in = byte | 0x100;
do
{
crc <<= 1;
in <<= 1;
if(in & 0x100)
++crc;
if(crc & 0x10000)
crc ^= 0x1021;
}
while(!(in & 0x10000));
return crc & 0xffffu;
}
/**
* @brief Cal CRC16 for YModem Packet
* @param data
* @param length
* @retval None
*/
uint16_t Cal_CRC16(const uint8_t* p_data, uint32_t size)
{
uint32_t crc = 0;
const uint8_t* dataEnd = p_data+size;
while(p_data < dataEnd)
crc = UpdateCRC16(crc, *p_data++);
crc = UpdateCRC16(crc, 0);
crc = UpdateCRC16(crc, 0);
return crc&0xffffu;
}
//Rx a packet from sender
//data: pointer to store rx data
//length: packet length
//timeout: rx time out
//return:0=normally return
// -1=timeout or packet error
// 1=abort by user
static int32_t Receive_Packet (uint8_t *data, int32_t *length, uint32_t timeout)
{
uint16_t i, packet_size;
uint8_t c;
uint32_t crc=0;
*length = 0;
if (Receive_Byte(&c, timeout) != 0)
{
return -1;
}
switch (c)
{
case SOH:
packet_size = PACKET_SIZE;
break;
case STX:
packet_size = PACKET_1K_SIZE;
break;
case EOT:
return 0;
case CA:
if ((Receive_Byte(&c, timeout) == 0) && (c == CA))
{
*length = -1;
return 0;
}
else
{
return -1;
}
case ABORT1:
case ABORT2:
return 1;
default:
return -1;
}
*data = c;
for (i = 1; i < (packet_size + PACKET_OVERHEAD); i ++)
{
if (Receive_Byte(data + i, timeout) != 0)
{
return -1;
}
}
crc = data[ packet_size + PACKET_HEADER ] << 8;
crc += data[ packet_size + PACKET_HEADER + 1 ];
if (Cal_CRC16(&data[PACKET_HEADER], packet_size) != crc )
{
packet_size = 0;
return -1;
}
*length = packet_size;
return 0;
}
//Receive a file using the ymodem protocol
//buf: pointer for data storage
//appaddr: User Application address
//return: size of IAP file
int32_t Ymodem_Receive (uint8_t *buf, uint32_t appaddr)
{
uint8_t packet_data[PACKET_1K_SIZE + PACKET_OVERHEAD], *file_ptr, *buf_ptr,flag_EOT;
int32_t i, packet_length, session_done, file_done, packets_received, errors, session_begin, size = 0;
uint32_t flashdestination, ramsource;
//Initialize flashdestination variable
flashdestination = appaddr;
flag_EOT = 0;
for (session_done = 0, errors = 0, session_begin = 0; ;)
{
for (packets_received = 0, file_done = 0, buf_ptr = buf; ;)
{
switch (Receive_Packet(packet_data, &packet_length, NAK_TIMEOUT))
{
case 0:
errors = 0;
switch (packet_length)
{
/* Abort by sender */
case - 1:
Send_Byte(ACK);
return 0;
/* End of transmission */
case 0:
if(flag_EOT==0) //first EOT
{
Send_Byte(NACK);
flag_EOT = 1;
}
else if (flag_EOT==1) //second EOT
{
Send_Byte(ACK);
Send_Byte('C');
file_done = 1;
}
break;
/* Normal packet */
default:
if ((packet_data[PACKET_SEQNO_INDEX] & 0xff) != (packets_received & 0xff))
{
Send_Byte(NACK);//local data sequence number is different to rx data packet.
}
else
{
if (packets_received == 0)
{
/* Filename packet */
if (packet_data[PACKET_HEADER] != 0)
{
/* Filename packet has valid data */
for (i = 0, file_ptr = packet_data + PACKET_HEADER; (*file_ptr != 0) && (i < FILE_NAME_LENGTH);)
{
FileName[i++] = *file_ptr++;
}
FileName[i++] = '\0';
for (i = 0, file_ptr ++; (*file_ptr != ' ') && (i < FILE_SIZE_LENGTH);)
{
file_size[i++] = *file_ptr++;
}
file_size[i++] = '\0';
size = atoi(file_size);
/* Test the size of the image to be sent */
/* Image size is greater than Flash size */
if (size > (int32_t)(STM_FLASH_Get_Block_Size(flashdestination) + 1))
{
/* End session */
Send_Byte(CA);
Send_Byte(CA);
return -1;
}
/* erase user application area */
STM_FLASH_Erase(flashdestination);
Send_Byte(ACK);
Send_Byte(CRC16);
}
/* Filename packet is empty, end session */
else
{
Send_Byte(ACK);
file_done = 1;
session_done = 1;
break;
}
}
/* Data packet */
else
{
memcpy(buf_ptr, packet_data + PACKET_HEADER, packet_length);
ramsource = (uint32_t)buf_ptr;
/* Write received data in Flash */
if (STMFLASH_Write(flashdestination, (uint32_t*)ramsource, (uint16_t) packet_length) == 0)
{
flashdestination+=packet_length;
Send_Byte(ACK);
}
else /* An error occurred while writing to Flash memory */
{
/* End session */
Send_Byte(CA);
Send_Byte(CA);
return -2;
}
}
packets_received ++;
session_begin = 1;
}
}
break;
case 1:
Send_Byte(CA);
Send_Byte(CA);
return -3;
default:
if (session_begin > 0)
{
errors ++;
}
if (errors > MAX_ERRORS)
{
Send_Byte(CA);
Send_Byte(CA);
return 0;
}
Send_Byte(CRC16);
break;
}
if (file_done != 0)
{
break;
}
}
if (session_done != 0)
{
break;
}
}
return (int32_t)size;
}