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components/utilities: add ymodem 

Real-YModem implemented a flexible YModem support. It use callback-based
structure to let the user application to deal with the data. It contains
3 examples:

    1. echo.c: write the data recieved on YModem to an other device
    2. null.c: discard the YModem data
    3. tofile.c: write the data to the file system

Currently, it does not support batch file transmission.
This commit is contained in:
Grissiom 2013-10-09 20:27:00 +08:00
parent 83bb05419f
commit 5674198759
6 changed files with 704 additions and 0 deletions
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8
components/utilities/ymodem/SConscript Normal file
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from building import *
cwd = GetCurrentDir()
src = Glob('*.c')
CPPPATH = [cwd]
group = DefineGroup('Utilities', src, depend = ['RT_USING_RYM'], CPPPATH = CPPPATH)
Return('group')

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components/utilities/ymodem/ymodem.c Normal file
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/*
* File : ymodem.c
* COPYRIGHT (C) 2012, Shanghai Real-Thread Technology Co., Ltd
*
* Change Logs:
* Date Author Notes
* 2013-04-14 Grissiom initial implementation
*/
#include <rthw.h>
#include "ymodem.h"
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
};
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;
}
// 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)
{
/* consume the available sem and read the data in buffer if possible */
while (rt_sem_trytake(&ctx->sem) == RT_EOK)
;
if (rt_device_read(ctx->dev, 0, ctx->buf, 1) == 1)
return *ctx->buf;
/* no data yet, wait for one */
if (rt_sem_take(&ctx->sem, timeout) != RT_EOK)
return RYM_CODE_NONE;
/* read one */
if (rt_device_read(ctx->dev, 0, ctx->buf, 1) == 1)
return *ctx->buf;
return RYM_CODE_NONE;
}
/* the caller should at least alloc _RYM_STX_PKG_SZ buffer */
static rt_size_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_size_t _rym_putchar(struct rym_ctx *ctx, rt_uint8_t code)
{
rt_device_write(ctx->dev, 0, &code, sizeof(code));
return 1;
}
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;
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)
break;
}
if (i == tm_sec)
return -RYM_ERR_TMO;
i = _rym_read_data(ctx, _RYM_SOH_PKG_SZ-1);
if (i != (_RYM_SOH_PKG_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+_RYM_SOH_PKG_SZ-2) << 8) | *(ctx->buf+_RYM_SOH_PKG_SZ-1);
cal_crc = CRC16(ctx->buf+3, _RYM_SOH_PKG_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, 128) != RYM_CODE_ACK)
return -RYM_ERR_CAN;
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;
}
/* 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;
while (1)
{
rt_err_t err;
enum rym_code code;
rt_size_t data_sz;
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:
return -RYM_ERR_CODE;
};
ctx->stage = RYM_STAGE_TRANSMITTING;
err = _rym_trans_data(ctx, data_sz, &code);
if (err != RT_EOK)
return err;
switch (code)
{
case RYM_CODE_CAN:
/* the spec require multiple CAN */
_rym_putchar(ctx, RYM_CODE_CAN);
_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_fin(struct rym_ctx *ctx)
{
enum rym_code code;
rt_uint16_t recv_crc;
rt_size_t i;
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)
return -RYM_ERR_CODE;
i = _rym_read_data(ctx, _RYM_SOH_PKG_SZ-1);
if (i != (_RYM_SOH_PKG_SZ-1))
return -RYM_ERR_DSZ;
/* sanity check
*
* TODO: multiple files transmission
*/
if (ctx->buf[1] != 0 || ctx->buf[2] != 0xFF)
return -RYM_ERR_SEQ;
recv_crc = (rt_uint16_t)(*(ctx->buf+_RYM_SOH_PKG_SZ-2) << 8) | *(ctx->buf+_RYM_SOH_PKG_SZ-1);
if (recv_crc != CRC16(ctx->buf+3, _RYM_SOH_PKG_SZ-5))
return -RYM_ERR_CRC;
/* 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_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)
return err;
err = _rym_do_trans(ctx);
if (err != RT_EOK)
return err;
return _rym_do_fin(ctx);
}
rt_err_t rym_recv_on_device(
struct rym_ctx *ctx,
rt_device_t dev,
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;
int int_lvl;
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.
*/
int_lvl = rt_hw_interrupt_disable();
rt_device_set_rx_indicate(dev, _rym_rx_ind);
odev_flag = dev->flag;
/* make sure the device don't change the content. */
dev->flag &= ~RT_DEVICE_FLAG_STREAM;
rt_hw_interrupt_enable(int_lvl);
res = rt_device_open(dev, 0);
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.
*/
int_lvl = rt_hw_interrupt_disable();
rt_sem_detach(&ctx->sem);
dev->flag = odev_flag;
rt_device_set_rx_indicate(dev, odev_rx_ind);
rt_hw_interrupt_enable(int_lvl);
rt_free(ctx->buf);
_rym_the_ctx = RT_NULL;
return res;
}

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#ifndef __YMODEM_H__
#define __YMODEM_H__
/*
* File : ymodem.h
* COPYRIGHT (C) 2012, Shanghai Real-Thread Technology Co., Ltd
*
* Change Logs:
* Date Author Notes
* 2013-04-14 Grissiom initial implementation
*/
#include "rtthread.h"
/* The word "RYM" is stand for "Real-YModem". */
enum rym_code {
RYM_CODE_NONE = 0x00,
RYM_CODE_SOH = 0x01,
RYM_CODE_STX = 0x02,
RYM_CODE_EOT = 0x04,
RYM_CODE_ACK = 0x06,
RYM_CODE_NAK = 0x15,
RYM_CODE_CAN = 0x18,
RYM_CODE_C = 0x43,
};
/* RYM error code
*
* We use the rt_err_t to return error values. We take use of current error
* codes available in RTT and append ourselves.
*/
/* timeout on handshake */
#define RYM_ERR_TMO 0x70
/* wrong code, wrong SOH, STX etc. */
#define RYM_ERR_CODE 0x71
/* wrong sequence number */
#define RYM_ERR_SEQ 0x72
/* wrong CRC checksum */
#define RYM_ERR_CRC 0x73
/* not enough data received */
#define RYM_ERR_DSZ 0x74
/* the transmission is aborted by user */
#define RYM_ERR_CAN 0x75
/* how many ticks wait for chars between packet. */
#ifndef RYM_WAIT_CHR_TICK
#define RYM_WAIT_CHR_TICK (RT_TICK_PER_SECOND * 3)
#endif
/* how many ticks wait for between packet. */
#ifndef RYM_WAIT_PKG_TICK
#define RYM_WAIT_PKG_TICK (RT_TICK_PER_SECOND * 3)
#endif
/* how many ticks between two handshake code. */
#ifndef RYM_CHD_INTV_TICK
#define RYM_CHD_INTV_TICK (RT_TICK_PER_SECOND / 4)
#endif
enum rym_stage {
RYM_STAGE_NONE,
/* set when C is send */
RYM_STAGE_ESTABLISHING,
/* set when we've got the packet 0 and sent ACK and second C */
RYM_STAGE_ESTABLISHED,
/* set when the sender respond to our second C */
RYM_STAGE_TRANSMITTING,
/* set when the sender send a EOT */
RYM_STAGE_FINISHING,
/* set when transmission is really finished, i.e., after the NAK, C, final
* NULL packet stuff. */
RYM_STAGE_FINISHED,
};
struct rym_ctx;
/* when receiving files, the buf will be the data received from ymodem protocol
* and the len is the data size.
*
* TODO:
* When sending files, the len is the buf size in RYM. The callback need to
* fill the buf with data to send. Returning RYM_CODE_EOT will terminate the
* transfer and the buf will be discarded. Any other return values will cause
* the transfer continue.
*/
typedef enum rym_code (*rym_callback)(struct rym_ctx *ctx, rt_uint8_t *buf, rt_size_t len);
/* Currently RYM only support one transfer session(ctx) for simplicity.
*
* In case we could support multiple sessions in The future, the first argument
* of APIs are (struct rym_ctx*).
*/
struct rym_ctx
{
rym_callback on_data;
rym_callback on_begin;
rym_callback on_end;
/* When error happened, user need to check this to get when the error has
* happened. */
enum rym_stage stage;
/* user could get the error content through this */
rt_uint8_t *buf;
struct rt_semaphore sem;
rt_device_t dev;
};
/** recv a file on device dev with ymodem session ctx.
*
* If an error happens, you can get where it is failed from ctx->stage.
*
* @param on_begin The callback will be invoked when the first packet arrived.
* This packet often contain file names and the size of the file, if the sender
* support it. So if you want to save the data to a file, you may need to
* create the file on need. It is the on_begin's responsibility to parse the
* data content. The on_begin can be NULL, in which case the transmission will
* continue without any side-effects.
*
* @param on_data The callback will be invoked on the packets received. The
* callback should save the data to the destination. The return value will be
* sent to the sender and in turn, only RYM_{ACK,CAN} is valid. When on_data is
* NULL, RYM will barely send ACK on every packet and have no side-effects.
*
* @param on_end The callback will be invoked when one transmission is
* finished. The data should be 128 bytes of NULL. You can do some cleaning job
* in this callback such as closing the file. The return value of this callback
* is ignored. As above, this parameter can be NULL if you don't need such
* function.
*
* @param handshake_timeout the timeout when hand shaking. The unit is in
* second.
*/
rt_err_t rym_recv_on_device(struct rym_ctx *ctx, rt_device_t dev,
rym_callback on_begin, rym_callback on_data, rym_callback on_end,
int handshake_timeout);
#endif

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#include <ymodem.h>
static rt_device_t _odev;
static enum rym_code _rym_echo_data(
struct rym_ctx *ctx,
rt_uint8_t *buf,
rt_size_t len)
{
rt_device_write(_odev, 0, buf, len);
return RYM_CODE_ACK;
}
rt_err_t rym_cat_to_dev(rt_device_t idev, rt_device_t odev)
{
struct rym_ctx rctx;
rt_err_t res;
_odev = odev;
rt_kprintf("entering RYM mode\n");
odev->flag &= ~RT_DEVICE_FLAG_STREAM;
res = rt_device_open(odev, 0);
if (res != RT_EOK)
{
rt_kprintf("open output device error: 0x%x", -res);
return res;
}
res = rym_recv_on_device(&rctx, idev,
RT_NULL, _rym_echo_data, RT_NULL, 1000);
rt_device_close(_odev);
rt_kprintf("leaving RYM mode with code %X\n", res);
return res;
}
#ifdef RT_USING_FINSH
#include <finsh.h>
void rym_cat_vcom(void)
{
extern rt_err_t rym_cat_to_dev(rt_device_t idev, rt_device_t odev);
rt_device_t idev, odev;
rt_thread_delay(RT_TICK_PER_SECOND*10);
idev = rt_device_find("uart1");
if (!idev)
{
rt_kprintf("could not find idev\n");
}
odev = rt_device_find("vcom");
if (!odev)
{
rt_kprintf("could not find odev\n");
}
rym_cat_to_dev(idev, odev);
}
FINSH_FUNCTION_EXPORT(rym_cat_vcom, test the YModem);
#endif

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examples/ymodem/null.c Normal file
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#include <ymodem.h>
static enum rym_code _rym_dummy_write(
struct rym_ctx *ctx,
rt_uint8_t *buf,
rt_size_t len)
{
return RYM_CODE_ACK;
}
#ifdef RT_USING_FINSH
#include <finsh.h>
rt_err_t rym_null(char *devname)
{
struct rym_ctx rctx;
rt_device_t dev = rt_device_find(devname);
if (!dev)
{
rt_kprintf("could not find device %s\n", devname);
return -1;
}
return rym_recv_on_device(&rctx, dev,
RT_NULL, _rym_dummy_write, RT_NULL, 1000);
}
FINSH_FUNCTION_EXPORT(rym_null, dump data to null);
#endif

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#include <rtthread.h>
#include <ymodem.h>
#include <dfs_posix.h>
#include <stdlib.h>
#include <board.h>
struct custom_ctx
{
struct rym_ctx parent;
int fd;
int flen;
char fpath[256];
};
static enum rym_code _rym_bg(
struct rym_ctx *ctx,
rt_uint8_t *buf,
rt_size_t len)
{
struct custom_ctx *cctx = (struct custom_ctx*)ctx;
cctx->fpath[0] = '/';
/* the buf should be the file name */
strcpy(&(cctx->fpath[1]), buf);
cctx->fd = open(cctx->fpath, O_CREAT | O_WRONLY | O_TRUNC, 0);
if (cctx->fd < 0)
{
rt_err_t err = rt_get_errno();
rt_kprintf("error creating file: %d\n", err);
rt_kprintf("abort transmission\n");
return RYM_CODE_CAN;
}
cctx->flen = atoi(buf+strlen(buf)+1);
if (cctx->flen == 0)
cctx->flen = -1;
return RYM_CODE_ACK;
}
static enum rym_code _rym_tof(
struct rym_ctx *ctx,
rt_uint8_t *buf,
rt_size_t len)
{
struct custom_ctx *cctx = (struct custom_ctx*)ctx;
RT_ASSERT(cctx->fd >= 0);
if (cctx->flen == -1)
{
write(cctx->fd, buf, len);
}
else
{
int wlen = len > cctx->flen ? cctx->flen : len;
write(cctx->fd, buf, wlen);
cctx->flen -= wlen;
}
return RYM_CODE_ACK;
}
static enum rym_code _rym_end(
struct rym_ctx *ctx,
rt_uint8_t *buf,
rt_size_t len)
{
struct custom_ctx *cctx = (struct custom_ctx*)ctx;
RT_ASSERT(cctx->fd >= 0);
close(cctx->fd);
cctx->fd = -1;
return RYM_CODE_ACK;
}
rt_err_t rym_write_to_file(rt_device_t idev)
{
rt_err_t res;
struct custom_ctx *ctx = rt_malloc(sizeof(*ctx));
RT_ASSERT(idev);
rt_kprintf("entering RYM mode\n");
res = rym_recv_on_device(&ctx->parent, idev,
_rym_bg, _rym_tof, _rym_end, 1000);
/* there is no Ymodem traffic on the line so print out info. */
rt_kprintf("leaving RYM mode with code %d\n", res);
rt_kprintf("file %s has been created.\n", ctx->fpath);
rt_free(ctx);
return res;
}
#ifdef RT_USING_FINSH
#include <finsh.h>
rt_err_t ry(char *dname)
{
rt_err_t res;
rt_device_t dev = rt_device_find(dname);
if (!dev)
{
rt_kprintf("could not find device:%s\n", dname);
return -RT_ERROR;
}
res = rym_write_to_file(dev);
return res;
}
FINSH_FUNCTION_EXPORT(ry, receive files by ymodem protocol);
#endif