From 5674198759e899854498207353ae59c526929070 Mon Sep 17 00:00:00 2001 From: Grissiom Date: Wed, 9 Oct 2013 20:27:00 +0800 Subject: [PATCH] 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. --- components/utilities/ymodem/SConscript | 8 + components/utilities/ymodem/ymodem.c | 361 +++++++++++++++++++++++++ components/utilities/ymodem/ymodem.h | 135 +++++++++ examples/ymodem/echo.c | 59 ++++ examples/ymodem/null.c | 28 ++ examples/ymodem/tofile.c | 113 ++++++++ 6 files changed, 704 insertions(+) create mode 100644 components/utilities/ymodem/SConscript create mode 100644 components/utilities/ymodem/ymodem.c create mode 100644 components/utilities/ymodem/ymodem.h create mode 100644 examples/ymodem/echo.c create mode 100644 examples/ymodem/null.c create mode 100644 examples/ymodem/tofile.c diff --git a/components/utilities/ymodem/SConscript b/components/utilities/ymodem/SConscript new file mode 100644 index 000000000..3fc3b1724 --- /dev/null +++ b/components/utilities/ymodem/SConscript @@ -0,0 +1,8 @@ +from building import * + +cwd = GetCurrentDir() +src = Glob('*.c') +CPPPATH = [cwd] +group = DefineGroup('Utilities', src, depend = ['RT_USING_RYM'], CPPPATH = CPPPATH) + +Return('group') diff --git a/components/utilities/ymodem/ymodem.c b/components/utilities/ymodem/ymodem.c new file mode 100644 index 000000000..fdd1950cc --- /dev/null +++ b/components/utilities/ymodem/ymodem.c @@ -0,0 +1,361 @@ +/* + * File : ymodem.c + * COPYRIGHT (C) 2012, Shanghai Real-Thread Technology Co., Ltd + * + * Change Logs: + * Date Author Notes + * 2013-04-14 Grissiom initial implementation + */ + +#include +#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; +} + diff --git a/components/utilities/ymodem/ymodem.h b/components/utilities/ymodem/ymodem.h new file mode 100644 index 000000000..daed61d15 --- /dev/null +++ b/components/utilities/ymodem/ymodem.h @@ -0,0 +1,135 @@ +#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 diff --git a/examples/ymodem/echo.c b/examples/ymodem/echo.c new file mode 100644 index 000000000..5ffa5ff41 --- /dev/null +++ b/examples/ymodem/echo.c @@ -0,0 +1,59 @@ +#include + +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 +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 + diff --git a/examples/ymodem/null.c b/examples/ymodem/null.c new file mode 100644 index 000000000..5e3baa987 --- /dev/null +++ b/examples/ymodem/null.c @@ -0,0 +1,28 @@ +#include + +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 +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 + diff --git a/examples/ymodem/tofile.c b/examples/ymodem/tofile.c new file mode 100644 index 000000000..2deef73c2 --- /dev/null +++ b/examples/ymodem/tofile.c @@ -0,0 +1,113 @@ +#include +#include +#include +#include + +#include + +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 +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