141 lines
4.5 KiB
C
141 lines
4.5 KiB
C
#ifndef __YMODEM_H__
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#define __YMODEM_H__
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/*
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* File : ymodem.h
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* COPYRIGHT (C) 2012, Shanghai Real-Thread Technology Co., Ltd
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*
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* Change Logs:
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* Date Author Notes
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* 2013-04-14 Grissiom initial implementation
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*/
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#include "rtthread.h"
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/* The word "RYM" is stand for "Real-YModem". */
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enum rym_code {
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RYM_CODE_NONE = 0x00,
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RYM_CODE_SOH = 0x01,
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RYM_CODE_STX = 0x02,
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RYM_CODE_EOT = 0x04,
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RYM_CODE_ACK = 0x06,
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RYM_CODE_NAK = 0x15,
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RYM_CODE_CAN = 0x18,
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RYM_CODE_C = 0x43,
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};
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/* RYM error code
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*
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* We use the rt_err_t to return error values. We take use of current error
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* codes available in RTT and append ourselves.
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*/
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/* timeout on handshake */
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#define RYM_ERR_TMO 0x70
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/* wrong code, wrong SOH, STX etc. */
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#define RYM_ERR_CODE 0x71
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/* wrong sequence number */
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#define RYM_ERR_SEQ 0x72
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/* wrong CRC checksum */
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#define RYM_ERR_CRC 0x73
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/* not enough data received */
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#define RYM_ERR_DSZ 0x74
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/* the transmission is aborted by user */
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#define RYM_ERR_CAN 0x75
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/* how many ticks wait for chars between packet. */
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#ifndef RYM_WAIT_CHR_TICK
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#define RYM_WAIT_CHR_TICK (RT_TICK_PER_SECOND * 3)
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#endif
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/* how many ticks wait for between packet. */
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#ifndef RYM_WAIT_PKG_TICK
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#define RYM_WAIT_PKG_TICK (RT_TICK_PER_SECOND * 3)
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#endif
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/* how many ticks between two handshake code. */
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#ifndef RYM_CHD_INTV_TICK
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#define RYM_CHD_INTV_TICK (RT_TICK_PER_SECOND * 3)
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#endif
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/* how many CAN be sent when user active end the session. */
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#ifndef RYM_END_SESSION_SEND_CAN_NUM
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#define RYM_END_SESSION_SEND_CAN_NUM 0x07
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#endif
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enum rym_stage {
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RYM_STAGE_NONE,
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/* set when C is send */
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RYM_STAGE_ESTABLISHING,
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/* set when we've got the packet 0 and sent ACK and second C */
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RYM_STAGE_ESTABLISHED,
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/* set when the sender respond to our second C */
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RYM_STAGE_TRANSMITTING,
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/* set when the sender send a EOT */
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RYM_STAGE_FINISHING,
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/* set when transmission is really finished, i.e., after the NAK, C, final
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* NULL packet stuff. */
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RYM_STAGE_FINISHED,
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};
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struct rym_ctx;
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/* when receiving files, the buf will be the data received from ymodem protocol
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* and the len is the data size.
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*
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* TODO:
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* When sending files, the len is the buf size in RYM. The callback need to
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* fill the buf with data to send. Returning RYM_CODE_EOT will terminate the
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* transfer and the buf will be discarded. Any other return values will cause
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* the transfer continue.
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*/
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typedef enum rym_code (*rym_callback)(struct rym_ctx *ctx, rt_uint8_t *buf, rt_size_t len);
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/* Currently RYM only support one transfer session(ctx) for simplicity.
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*
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* In case we could support multiple sessions in The future, the first argument
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* of APIs are (struct rym_ctx*).
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*/
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struct rym_ctx
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{
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rym_callback on_data;
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rym_callback on_begin;
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rym_callback on_end;
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/* When error happened, user need to check this to get when the error has
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* happened. */
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enum rym_stage stage;
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/* user could get the error content through this */
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rt_uint8_t *buf;
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struct rt_semaphore sem;
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rt_device_t dev;
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};
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/** recv a file on device dev with ymodem session ctx.
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*
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* If an error happens, you can get where it is failed from ctx->stage.
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*
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* @param on_begin The callback will be invoked when the first packet arrived.
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* This packet often contain file names and the size of the file, if the sender
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* support it. So if you want to save the data to a file, you may need to
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* create the file on need. It is the on_begin's responsibility to parse the
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* data content. The on_begin can be NULL, in which case the transmission will
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* continue without any side-effects.
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*
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* @param on_data The callback will be invoked on the packets received. The
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* callback should save the data to the destination. The return value will be
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* sent to the sender and in turn, only RYM_{ACK,CAN} is valid. When on_data is
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* NULL, RYM will barely send ACK on every packet and have no side-effects.
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*
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* @param on_end The callback will be invoked when one transmission is
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* finished. The data should be 128 bytes of NULL. You can do some cleaning job
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* in this callback such as closing the file. The return value of this callback
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* is ignored. As above, this parameter can be NULL if you don't need such
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* function.
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*
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* @param handshake_timeout the timeout when hand shaking. The unit is in
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* second.
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*/
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rt_err_t rym_recv_on_device(struct rym_ctx *ctx, rt_device_t dev, rt_uint16_t oflag,
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rym_callback on_begin, rym_callback on_data, rym_callback on_end,
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int handshake_timeout);
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#endif
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