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