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rt-thread-official/components/utilities/ymodem/ymodem.c

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/*
* COPYRIGHT (C) 2011-2023, Real-Thread Information Technology Ltd
* All rights reserved
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2013-04-14 Grissiom initial implementation
* 2019-12-09 Steven Liu add YMODEM send protocol
*/
#include <rthw.h>
#include "ymodem.h"
#ifdef YMODEM_USING_CRC_TABLE
static const rt_uint16_t ccitt_table[256] =
{
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
};
static rt_uint16_t CRC16(unsigned char *q, int len)
{
rt_uint16_t crc = 0;
while (len-- > 0)
crc = (crc << 8) ^ ccitt_table[((crc >> 8) ^ *q++) & 0xff];
return crc;
}
#else
static rt_uint16_t CRC16(unsigned char *q, int len)
{
rt_uint16_t crc;
char i;
crc = 0;
while (--len >= 0)
{
crc = crc ^ (int) * q++ << 8;
i = 8;
do
{
if (crc & 0x8000)
crc = crc << 1 ^ 0x1021;
else
crc = crc << 1;
}
while (--i);
}
return (crc);
}
#endif
// we could only use global varible because we could not use
// rt_device_t->user_data(it is used by the serial driver)...
static struct rym_ctx *_rym_the_ctx;
static rt_err_t _rym_rx_ind(rt_device_t dev, rt_size_t size)
{
return rt_sem_release(&_rym_the_ctx->sem);
}
/* SOH/STX + seq + payload + crc */
#define _RYM_SOH_PKG_SZ (1+2+128+2)
#define _RYM_STX_PKG_SZ (1+2+1024+2)
static enum rym_code _rym_read_code(
struct rym_ctx *ctx,
rt_tick_t timeout)
{
/* Fast path */
if (rt_device_read(ctx->dev, 0, ctx->buf, 1) == 1)
return (enum rym_code)(*ctx->buf);
/* Slow path */
do
{
rt_size_t rsz;
/* No data yet, wait for one */
if (rt_sem_take(&ctx->sem, timeout) != RT_EOK)
return RYM_CODE_NONE;
/* Try to read one */
rsz = rt_device_read(ctx->dev, 0, ctx->buf, 1);
if (rsz == 1)
return (enum rym_code)(*ctx->buf);
}
while (1);
}
/* the caller should at least alloc _RYM_STX_PKG_SZ buffer */
static rt_ssize_t _rym_read_data(
struct rym_ctx *ctx,
rt_size_t len)
{
/* we should already have had the code */
rt_uint8_t *buf = ctx->buf + 1;
rt_size_t readlen = 0;
do
{
readlen += rt_device_read(ctx->dev,
0, buf + readlen, len - readlen);
if (readlen >= len)
return readlen;
}
while (rt_sem_take(&ctx->sem, RYM_WAIT_CHR_TICK) == RT_EOK);
return readlen;
}
static rt_err_t _rym_send_packet(
struct rym_ctx *ctx,
enum rym_code code,
rt_uint8_t index)
{
rt_uint16_t send_crc;
rt_uint8_t index_inv = ~index;
rt_size_t writelen = 0;
rt_size_t packetlen = 0;
switch(code)
{
case RYM_CODE_SOH:
packetlen = _RYM_SOH_PKG_SZ;
break;
case RYM_CODE_STX:
packetlen = _RYM_STX_PKG_SZ;
break;
default:
return -RT_ERROR;
}
send_crc = CRC16(ctx->buf + 3, packetlen - 5);
ctx->buf[0] = code;
ctx->buf[1] = index;
ctx->buf[2] = index_inv;
ctx->buf[packetlen - 2] = (rt_uint8_t)(send_crc >> 8);
ctx->buf[packetlen - 1] = (rt_uint8_t)send_crc & 0xff;
do
{
writelen += rt_device_write(ctx->dev, 0, ctx->buf + writelen,
packetlen - writelen);
}
while (writelen < packetlen);
return RT_EOK;
}
static rt_ssize_t _rym_putchar(struct rym_ctx *ctx, rt_uint8_t code)
{
rt_device_write(ctx->dev, 0, &code, sizeof(code));
return 1;
}
static rt_ssize_t _rym_getchar(struct rym_ctx *ctx)
{
rt_uint8_t getc_ack;
while (rt_device_read(ctx->dev, 0, &getc_ack, 1) != 1)
{
rt_sem_take(&ctx->sem, RT_WAITING_FOREVER);
}
return getc_ack;
}
static rt_err_t _rym_do_handshake(
struct rym_ctx *ctx,
int tm_sec)
{
enum rym_code code;
rt_size_t i;
rt_uint16_t recv_crc, cal_crc;
rt_size_t data_sz;
rt_tick_t tick;
ctx->stage = RYM_STAGE_ESTABLISHING;
/* send C every second, so the sender could know we are waiting for it. */
for (i = 0; i < tm_sec; i++)
{
_rym_putchar(ctx, RYM_CODE_C);
code = _rym_read_code(ctx,
RYM_CHD_INTV_TICK);
if (code == RYM_CODE_SOH)
{
data_sz = _RYM_SOH_PKG_SZ;
break;
}
else if (code == RYM_CODE_STX)
{
data_sz = _RYM_STX_PKG_SZ;
break;
}
}
if (i == tm_sec)
{
return -RYM_ERR_TMO;
}
/* receive all data */
i = 0;
/* automatic exit after receiving specified length data, timeout: 100ms */
tick = rt_tick_get();
while (rt_tick_get() <= (tick + rt_tick_from_millisecond(100)) && i < (data_sz - 1))
{
i += _rym_read_data(ctx, data_sz - 1);
rt_thread_mdelay(5);
}
if (i != (data_sz - 1))
return -RYM_ERR_DSZ;
/* sanity check */
if (ctx->buf[1] != 0 || ctx->buf[2] != 0xFF)
return -RYM_ERR_SEQ;
recv_crc = (rt_uint16_t)(*(ctx->buf + data_sz - 2) << 8) | *(ctx->buf + data_sz - 1);
cal_crc = CRC16(ctx->buf + 3, data_sz - 5);
if (recv_crc != cal_crc)
return -RYM_ERR_CRC;
/* congratulations, check passed. */
if (ctx->on_begin && ctx->on_begin(ctx, ctx->buf + 3, data_sz - 5) != RYM_CODE_ACK)
return -RYM_ERR_CAN;
return RT_EOK;
}
static rt_err_t _rym_do_send_handshake(
struct rym_ctx *ctx,
int tm_sec)
{
enum rym_code code;
rt_size_t i;
rt_size_t data_sz;
rt_uint8_t index = 0;
rt_uint8_t getc_ack;
ctx->stage = RYM_STAGE_ESTABLISHING;
data_sz = _RYM_SOH_PKG_SZ;
/* receive C every second */
for (i = 0; i < tm_sec; i++)
{
code = _rym_read_code(ctx,
RYM_CHD_INTV_TICK);
if (code == RYM_CODE_C)
{
break;
}
}
if (i == tm_sec)
{
return -RYM_ERR_TMO;
}
/* congratulations, check passed. */
if (ctx->on_begin && ctx->on_begin(ctx, ctx->buf + 3, data_sz - 5) != RYM_CODE_SOH)
return -RYM_ERR_CODE;
code = RYM_CODE_SOH;
_rym_send_packet(ctx, code, index);
rt_device_set_rx_indicate(ctx->dev, _rym_rx_ind);
getc_ack = _rym_getchar(ctx);
if (getc_ack != RYM_CODE_ACK)
{
return -RYM_ERR_ACK;
}
getc_ack = _rym_getchar(ctx);
if (getc_ack != RYM_CODE_C)
{
return -RYM_ERR_ACK;
}
ctx->stage = RYM_STAGE_ESTABLISHED;
return RT_EOK;
}
static rt_err_t _rym_trans_data(
struct rym_ctx *ctx,
rt_size_t data_sz,
enum rym_code *code)
{
const rt_size_t tsz = 2 + data_sz + 2;
rt_uint16_t recv_crc;
/* seq + data + crc */
rt_size_t i = _rym_read_data(ctx, tsz);
if (i != tsz)
return -RYM_ERR_DSZ;
if ((ctx->buf[1] + ctx->buf[2]) != 0xFF)
{
return -RYM_ERR_SEQ;
}
/* As we are sending C continuously, there is a chance that the
* sender(remote) receive an C after sending the first handshake package.
* So the sender will interpret it as NAK and re-send the package. So we
* just ignore it and proceed. */
if (ctx->stage == RYM_STAGE_ESTABLISHED && ctx->buf[1] == 0x00)
{
*code = RYM_CODE_NONE;
return RT_EOK;
}
ctx->stage = RYM_STAGE_TRANSMITTING;
/* sanity check */
recv_crc = (rt_uint16_t)(*(ctx->buf + tsz - 1) << 8) | *(ctx->buf + tsz);
if (recv_crc != CRC16(ctx->buf + 3, data_sz))
return -RYM_ERR_CRC;
/* congratulations, check passed. */
if (ctx->on_data)
*code = ctx->on_data(ctx, ctx->buf + 3, data_sz);
else
*code = RYM_CODE_ACK;
return RT_EOK;
}
static rt_err_t _rym_do_trans(struct rym_ctx *ctx)
{
_rym_putchar(ctx, RYM_CODE_ACK);
_rym_putchar(ctx, RYM_CODE_C);
ctx->stage = RYM_STAGE_ESTABLISHED;
rt_size_t errors = 0;
while (1)
{
rt_err_t err;
enum rym_code code;
rt_size_t data_sz, i;
code = _rym_read_code(ctx,
RYM_WAIT_PKG_TICK);
switch (code)
{
case RYM_CODE_SOH:
data_sz = 128;
break;
case RYM_CODE_STX:
data_sz = 1024;
break;
case RYM_CODE_EOT:
return RT_EOK;
default:
errors++;
if(errors > RYM_MAX_ERRORS)
{
return -RYM_ERR_CODE;/* Abort communication */
}
else
{
_rym_putchar(ctx, RYM_CODE_NAK);/* Ask for a packet */
continue;
}
};
err = _rym_trans_data(ctx, data_sz, &code);
if (err != RT_EOK)
{
errors++;
if(errors > RYM_MAX_ERRORS)
{
return err;/* Abort communication */
}
else
{
_rym_putchar(ctx, RYM_CODE_NAK);/* Ask for a packet */
continue;
}
}
else
{
errors = 0;
}
switch (code)
{
case RYM_CODE_CAN:
/* the spec require multiple CAN */
for (i = 0; i < RYM_END_SESSION_SEND_CAN_NUM; i++)
{
_rym_putchar(ctx, RYM_CODE_CAN);
}
return -RYM_ERR_CAN;
case RYM_CODE_ACK:
_rym_putchar(ctx, RYM_CODE_ACK);
break;
default:
// wrong code
break;
};
}
}
static rt_err_t _rym_do_send_trans(struct rym_ctx *ctx)
{
ctx->stage = RYM_STAGE_TRANSMITTING;
enum rym_code code;
rt_size_t data_sz;
rt_uint32_t index = 1;
rt_uint8_t getc_ack;
data_sz = _RYM_STX_PKG_SZ;
while (1)
{
if (!ctx->on_data)
{
return -RYM_ERR_CODE;
}
code = ctx->on_data(ctx, ctx->buf + 3, data_sz - 5);
_rym_send_packet(ctx, code, index);
index++;
rt_device_set_rx_indicate(ctx->dev, _rym_rx_ind);
getc_ack = _rym_getchar(ctx);
if (getc_ack != RYM_CODE_ACK)
{
return -RYM_ERR_ACK;
}
if (ctx->stage == RYM_STAGE_FINISHING)
break;
}
return RT_EOK;
}
static rt_err_t _rym_do_fin(struct rym_ctx *ctx)
{
enum rym_code code;
rt_uint16_t recv_crc;
rt_size_t i;
rt_size_t data_sz;
ctx->stage = RYM_STAGE_FINISHING;
/* we already got one EOT in the caller. invoke the callback if there is
* one. */
if (ctx->on_end)
ctx->on_end(ctx, ctx->buf + 3, 128);
_rym_putchar(ctx, RYM_CODE_NAK);
code = _rym_read_code(ctx, RYM_WAIT_PKG_TICK);
if (code != RYM_CODE_EOT)
return -RYM_ERR_CODE;
_rym_putchar(ctx, RYM_CODE_ACK);
_rym_putchar(ctx, RYM_CODE_C);
code = _rym_read_code(ctx, RYM_WAIT_PKG_TICK);
if (code == RYM_CODE_SOH)
{
data_sz = _RYM_SOH_PKG_SZ;
}
else if (code == RYM_CODE_STX)
{
data_sz = _RYM_STX_PKG_SZ;
}
else
return -RYM_ERR_CODE;
i = _rym_read_data(ctx, data_sz - 1);
if (i != (data_sz - 1))
return -RYM_ERR_DSZ;
/* sanity check
*/
if (ctx->buf[1] != 0 || ctx->buf[2] != 0xFF)
return -RYM_ERR_SEQ;
recv_crc = (rt_uint16_t)(*(ctx->buf + data_sz - 2) << 8) | *(ctx->buf + data_sz - 1);
if (recv_crc != CRC16(ctx->buf + 3, data_sz - 5))
return -RYM_ERR_CRC;
/*next file transmission*/
if (ctx->buf[3] != 0)
{
if (ctx->on_begin && ctx->on_begin(ctx, ctx->buf + 3, data_sz - 5) != RYM_CODE_ACK)
return -RYM_ERR_CAN;
return RT_EOK;
}
/* congratulations, check passed. */
ctx->stage = RYM_STAGE_FINISHED;
/* put the last ACK */
_rym_putchar(ctx, RYM_CODE_ACK);
return RT_EOK;
}
static rt_err_t _rym_do_send_fin(struct rym_ctx *ctx)
{
enum rym_code code;
rt_size_t data_sz;
rt_uint8_t index = 0;
rt_uint8_t getc_ack;
data_sz = _RYM_SOH_PKG_SZ;
rt_device_set_rx_indicate(ctx->dev, _rym_rx_ind);
_rym_putchar(ctx, RYM_CODE_EOT);
getc_ack = _rym_getchar(ctx);
if (getc_ack != RYM_CODE_NAK)
{
return -RYM_ERR_ACK;
}
_rym_putchar(ctx, RYM_CODE_EOT);
getc_ack = _rym_getchar(ctx);
if (getc_ack != RYM_CODE_ACK)
{
return -RYM_ERR_ACK;
}
getc_ack = _rym_getchar(ctx);
if (getc_ack != RYM_CODE_C)
{
return -RYM_ERR_ACK;
}
if (ctx->on_end && ctx->on_end(ctx, ctx->buf + 3, data_sz - 5) != RYM_CODE_SOH)
return -RYM_ERR_CODE;
code = RYM_CODE_SOH;
_rym_send_packet(ctx, code, index);
ctx->stage = RYM_STAGE_FINISHED;
return RT_EOK;
}
static rt_err_t _rym_do_recv(
struct rym_ctx *ctx,
int handshake_timeout)
{
rt_err_t err;
ctx->stage = RYM_STAGE_NONE;
ctx->buf = rt_malloc(_RYM_STX_PKG_SZ);
if (ctx->buf == RT_NULL)
return -RT_ENOMEM;
err = _rym_do_handshake(ctx, handshake_timeout);
if (err != RT_EOK)
{
rt_free(ctx->buf);
return err;
}
while (1)
{
err = _rym_do_trans(ctx);
err = _rym_do_fin(ctx);
if (err != RT_EOK)
{
rt_free(ctx->buf);
return err;
}
if (ctx->stage == RYM_STAGE_FINISHED)
break;
}
rt_free(ctx->buf);
return err;
}
static rt_err_t _rym_do_send(
struct rym_ctx *ctx,
int handshake_timeout)
{
rt_err_t err;
ctx->stage = RYM_STAGE_NONE;
ctx->buf = rt_malloc(_RYM_STX_PKG_SZ);
if (ctx->buf == RT_NULL)
return -RT_ENOMEM;
err = _rym_do_send_handshake(ctx, handshake_timeout);
if (err != RT_EOK)
{
rt_free(ctx->buf);
return err;
}
err = _rym_do_send_trans(ctx);
if (err != RT_EOK)
{
rt_free(ctx->buf);
return err;
}
err = _rym_do_send_fin(ctx);
if (err != RT_EOK)
{
rt_free(ctx->buf);
return err;
}
rt_free(ctx->buf);
return err;
}
rt_err_t rym_recv_on_device(
struct rym_ctx *ctx,
rt_device_t dev,
rt_uint16_t oflag,
rym_callback on_begin,
rym_callback on_data,
rym_callback on_end,
int handshake_timeout)
{
rt_err_t res;
rt_err_t (*odev_rx_ind)(rt_device_t dev, rt_size_t size);
rt_uint16_t odev_flag;
rt_base_t level;
RT_ASSERT(_rym_the_ctx == 0);
_rym_the_ctx = ctx;
ctx->on_begin = on_begin;
ctx->on_data = on_data;
ctx->on_end = on_end;
ctx->dev = dev;
rt_sem_init(&ctx->sem, "rymsem", 0, RT_IPC_FLAG_FIFO);
odev_rx_ind = dev->rx_indicate;
/* no data should be received before the device has been fully setted up.
*/
level = rt_hw_interrupt_disable();
rt_device_set_rx_indicate(dev, _rym_rx_ind);
odev_flag = dev->open_flag;
/* make sure the device don't change the content. */
dev->open_flag &= ~RT_DEVICE_FLAG_STREAM;
rt_hw_interrupt_enable(level);
res = rt_device_open(dev, oflag);
if (res != RT_EOK)
goto __exit;
res = _rym_do_recv(ctx, handshake_timeout);
rt_device_close(dev);
__exit:
/* no rx_ind should be called before the callback has been fully detached.
*/
level = rt_hw_interrupt_disable();
rt_sem_detach(&ctx->sem);
dev->open_flag = odev_flag;
rt_device_set_rx_indicate(dev, odev_rx_ind);
rt_hw_interrupt_enable(level);
_rym_the_ctx = RT_NULL;
return res;
}
rt_err_t rym_send_on_device(
struct rym_ctx *ctx,
rt_device_t dev,
rt_uint16_t oflag,
rym_callback on_begin,
rym_callback on_data,
rym_callback on_end,
int handshake_timeout)
{
rt_err_t res = 0;
rt_err_t (*odev_rx_ind)(rt_device_t dev, rt_size_t size);
rt_uint16_t odev_flag;
rt_base_t level;
RT_ASSERT(_rym_the_ctx == 0);
_rym_the_ctx = ctx;
ctx->on_begin = on_begin;
ctx->on_data = on_data;
ctx->on_end = on_end;
ctx->dev = dev;
rt_sem_init(&ctx->sem, "rymsem", 0, RT_IPC_FLAG_FIFO);
odev_rx_ind = dev->rx_indicate;
/* no data should be received before the device has been fully setted up.
*/
level = rt_hw_interrupt_disable();
rt_device_set_rx_indicate(dev, _rym_rx_ind);
odev_flag = dev->open_flag;
/* make sure the device don't change the content. */
dev->open_flag &= ~RT_DEVICE_FLAG_STREAM;
rt_hw_interrupt_enable(level);
res = rt_device_open(dev, oflag);
if (res != RT_EOK)
goto __exit;
res = _rym_do_send(ctx, handshake_timeout);
rt_device_close(dev);
__exit:
level = rt_hw_interrupt_disable();
rt_sem_detach(&ctx->sem);
dev->open_flag = odev_flag;
rt_device_set_rx_indicate(dev, odev_rx_ind);
rt_hw_interrupt_enable(level);
_rym_the_ctx = RT_NULL;
return res;
}
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