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optimize the codes with lwip and opcua

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This commit is contained in:
wlyu
2022-03-21 16:47:32 +08:00
parent a52854efb6
commit f74d1dafd7
25 changed files with 452 additions and 2257 deletions
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Ubiquitous/XiZi/board/ok1052-c/board.c
+8
View File
@@ -84,6 +84,10 @@ int MountSDCard(void)
#include <connect_adc.h>
#endif
#ifdef BSP_USING_I2C
#include <connect_i2c.h>
#endif
#ifdef BSP_USING_SPI
#include <connect_spi.h>
#endif
@@ -688,6 +692,10 @@ void InitBoardHardware()
Imrt1052HwAdcInit();
#endif
#ifdef BSP_USING_I2C
Imrt1052HwI2cInit();
#endif
#ifdef BSP_USING_SPI
Imrt1052HwSpiInit();
#endif
Ubiquitous/XiZi/board/ok1052-c/third_party_driver/i2c/connect_i2c.c
+1 -1
View File
@@ -143,7 +143,7 @@ static int BoardI2cDevBend(void)
}
/*BOARD I2C INIT*/
int Stm32HwI2cInit(void)
int Imrt1052HwI2cInit(void)
{
static int init_flag = 0;
x_err_t ret = EOK;
Ubiquitous/XiZi/board/ok1052-c/third_party_driver/i2c/connect_i2c_eeprom.c
-1
View File
@@ -65,7 +65,6 @@ void I2cEEpromTestWrite(void)
int I2cEEpromTest(void)
{
Stm32HwI2cInit();
BOARD_InitI2C1Pins();
I2cHardwareInit();
I2cEEpromTestWrite();
Ubiquitous/XiZi/board/ok1052-c/third_party_driver/include/connect_i2c.h
+1 -1
View File
@@ -37,7 +37,7 @@ typedef struct Stm32I2c
#define i2c_print KPrintf
int Stm32HwI2cInit(void);
int Imrt1052HwI2cInit(void);
#ifdef __cplusplus
}
Ubiquitous/XiZi/resources/ethernet/LwIP/api/api_lib.c
-1
View File
@@ -245,7 +245,6 @@ netconn_delete(struct netconn *conn)
err = ERR_OK;
} else
#endif /* LWIP_NETCONN_FULLDUPLEX */
//tst by wly
{
err = netconn_prepare_delete(conn);
}
Ubiquitous/XiZi/resources/ethernet/LwIP/api/sockets.c
-20
View File
@@ -497,18 +497,6 @@ get_socket(int fd)
return sock;
}
void pr_socket_buf(void)
{
int i;
lw_debug("socket:\n");
for (i = 0; i < NUM_SOCKETS; ++i) {
// if (!sockets[i].conn)
lw_debug("%d: conn %p rcv %d send %d wait %d\n", i, sockets[i].conn, sockets[i].rcvevent, sockets[i].sendevent,
sockets[i].select_waiting);
}
}
/**
* Allocate a new socket for a given netconn.
*
@@ -600,7 +588,6 @@ free_socket_free_elements(int is_tcp, struct netconn *conn, union lwip_sock_last
}
if (conn != NULL) {
/* netconn_prepare_delete() has already been called, here we only free the conn */
lw_debug("lw: [%s] tcp %d socket %d accept %d recv %d\n", __func__, is_tcp, conn->socket, conn->acceptmbox, conn->recvmbox);
netconn_delete(conn);
}
}
@@ -673,8 +660,6 @@ lwip_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
newsock = alloc_socket(newconn, 1);
if (newsock == -1) {
lw_debug("lw: [%s] recv %d\n", __func__, newconn->recvmbox);
pr_socket_buf();
netconn_delete(newconn);
sock_set_errno(sock, ENFILE);
done_socket(sock);
@@ -711,8 +696,6 @@ lwip_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
err = netconn_peer(newconn, &naddr, &port);
if (err != ERR_OK) {
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d): netconn_peer failed, err=%d\n", s, err));
lw_debug("lw: [%s] recv %x\n", __func__, newconn->recvmbox);
netconn_delete(newconn);
free_socket(nsock, 1);
sock_set_errno(sock, err_to_errno(err));
@@ -1756,8 +1739,6 @@ lwip_socket(int domain, int type, int protocol)
i = alloc_socket(conn, 0);
if (i == -1) {
lw_debug("lw: [%s] recv %d delete no socket\n", __func__, conn->recvmbox);
pr_socket_buf();
netconn_delete(conn);
set_errno(ENFILE);
return -1;
@@ -1766,7 +1747,6 @@ lwip_socket(int domain, int type, int protocol)
done_socket(&sockets[i - LWIP_SOCKET_OFFSET]);
LWIP_DEBUGF(SOCKETS_DEBUG, ("%d\n", i));
set_errno(0);
lw_debug("lw: [%s] new socket %d %p\n", __func__, i, conn);
return i;
}
Ubiquitous/XiZi/resources/ethernet/LwIP/arch/lwipopts.h
+2 -3
View File
@@ -250,10 +250,9 @@ typedef unsigned int nfds_t;
#define MEMP_MEM_MALLOC 1
#define lw_print //KPrintf
#define lw_trace() //KPrintf("lw: [%s][%d] passed!\n", __func__, __LINE__)
#define lw_error() //KPrintf("lw: [%s][%d] failed!\n", __func__, __LINE__)
#define lw_debug KPrintf
#define lw_error KPrintf
#define lw_notice KPrintf
#endif /* __LWIPOPTS_H__ */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
Ubiquitous/XiZi/resources/ethernet/LwIP/core/tcp_out.c
+1 -5
View File
@@ -355,7 +355,7 @@ tcp_write_checks(struct tcp_pcb *pcb, u16_t len)
* it can send them more efficiently by combining them together).
* To prompt the system to send data now, call tcp_output() after
* calling tcp_write().
*
*
* This function enqueues the data pointed to by the argument dataptr. The length of
* the data is passed as the len parameter. The apiflags can be one or more of:
* - TCP_WRITE_FLAG_COPY: indicates whether the new memory should be allocated
@@ -1386,17 +1386,13 @@ tcp_output(struct tcp_pcb *pcb)
/* In the case of fast retransmit, the packet should not go to the tail
* of the unacked queue, but rather somewhere before it. We need to check for
* this case. -STJ Jul 27, 2004 */
lw_debug("check %s seg %p useg %p\n", __func__, seg, useg);
if (TCP_SEQ_LT(lwip_ntohl(seg->tcphdr->seqno), lwip_ntohl(useg->tcphdr->seqno))) {
/* add segment to before tail of unacked list, keeping the list sorted */
struct tcp_seg **cur_seg = &(pcb->unacked);
lw_debug("check %s ", __func__);
while (*cur_seg &&
TCP_SEQ_LT(lwip_ntohl((*cur_seg)->tcphdr->seqno), lwip_ntohl(seg->tcphdr->seqno))) {
lw_debug("%p -> ", *cur_seg);
cur_seg = &((*cur_seg)->next );
}
lw_debug("\n");
seg->next = (*cur_seg);
(*cur_seg) = seg;
} else {
Ubiquitous/XiZi/resources/ethernet/cmd_lwip/lwip_config_demo.c
+3 -31
View File
@@ -18,40 +18,18 @@
* @date 2021.12.15
*/
#include "lwip/opt.h"
#if LWIP_IPV4 && LWIP_RAW
#include "ping.h"
#include "lwip/timeouts.h"
#include "lwip/init.h"
#include "netif/ethernet.h"
#include "board.h"
#include "pin_mux.h"
#include "clock_config.h"
#include <transform.h>
#include <sys_arch.h>
#include "connect_ethernet.h"
#include "sys_arch.h"
/******************************************************************************/
static void *LwipSetIPTask(void *param)
static void LwipSetIPTask(void *param)
{
lwip_config_net(lwip_ipaddr, lwip_netmask, lwip_gwaddr);
}
void LwipSetIPTest(int argc, char *argv[])
{
int result = 0;
pthread_t th_id;
pthread_attr_t attr;
attr.schedparam.sched_priority = LWIP_DEMO_TASK_PRIO;
attr.stacksize = LWIP_TASK_STACK_SIZE;
if(argc >= 4)
{
lw_print("lw: [%s] ip %s mask %s gw %s\n", __func__, argv[1], argv[2], argv[3]);
@@ -65,12 +43,7 @@ void LwipSetIPTest(int argc, char *argv[])
sscanf(argv[1], "%d.%d.%d.%d", &lwip_ipaddr[0], &lwip_ipaddr[1], &lwip_ipaddr[2], &lwip_ipaddr[3]);
}
result = pthread_create(&th_id, &attr, LwipSetIPTask, NULL);
if (0 == result) {
lw_print("lw: [%s] thread %d successfully!\n", __func__, th_id);
} else {
lw_print("lw: [%s] failed! error code is %d\n", __func__, result);
}
sys_thread_new("SET ip address", LwipSetIPTask, NULL, LWIP_TASK_STACK_SIZE, LWIP_DEMO_TASK_PRIO);
}
SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0) | SHELL_CMD_TYPE(SHELL_TYPE_CMD_MAIN) | SHELL_CMD_PARAM_NUM(3),
@@ -98,4 +71,3 @@ void LwipShowIPTask(int argc, char *argv[])
SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0) | SHELL_CMD_TYPE(SHELL_TYPE_CMD_MAIN) | SHELL_CMD_PARAM_NUM(0),
showip, LwipShowIPTask, GetIp [IP] [Netmask] [Gateway]);
#endif
Ubiquitous/XiZi/resources/ethernet/cmd_lwip/lwip_demo.h
+30
View File
@@ -1,7 +1,37 @@
/*
* Copyright (c) 2022 AIIT XUOS Lab
* XiUOS is licensed under Mulan PSL v2.
* You can use this software according to the terms and conditions of the Mulan PSL v2.
* You may obtain a copy of Mulan PSL v2 at:
* http://license.coscl.org.cn/MulanPSL2
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
* See the Mulan PSL v2 for more details.
*/
/**
* @file lwip_demo.h
* @brief lwip demo relative struct and definition
* @version 1.0
* @author AIIT XUOS Lab
* @date 2022-03-21
*/
#ifndef __LWIP_DEMO_H__
#define __LWIP_DEMO_H__
typedef struct LwipTcpSocketStruct
{
char ip[6];
uint16_t port;
char *buf;
}LwipTcpSocketParamType;
#define LWIP_TEST_MSG_SIZE 128
#define LWIP_TEST_STACK_SIZE 4096
#define LWIP_TEST_TASK_PRIO 20
#endif /* __LWIP_DEMO_H__ */
Ubiquitous/XiZi/resources/ethernet/cmd_lwip/lwip_tcp_demo.c
+26 -39
View File
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2020 AIIT XUOS Lab
* Copyright (c) 2022 AIIT XUOS Lab
* XiUOS is licensed under Mulan PSL v2.
* You can use this software according to the terms and conditions of the Mulan PSL v2.
* You may obtain a copy of Mulan PSL v2 at:
@@ -11,45 +11,32 @@
*/
/**
* @file tcp_echo_socket_demo.c
* @brief One UDP demo based on LwIP
* @file lwip_tcp_demo.c
* @brief TCP demo based on LwIP
* @version 1.0
* @author AIIT XUOS Lab
* @date 2021-05-29
* @date 2022-03-21
*/
#include <transform.h>
#include <xizi.h>
#include "board.h"
#include "lwip_demo.h"
#include "sys_arch.h"
#include <lwip/sockets.h>
#include "lwip/sys.h"
#include "lwip/sockets.h"
#include "tcpecho_raw.h"
#define MSG_SIZE 128
typedef struct LwipTcpSocketStruct
{
char ip[6];
uint16_t port;
char *buf; // test buffer
}LwipTcpSocketParamType;
// this is for test in shell, in fact, shell restrict the length of input string, which is less then 128
char tcp_send_msg[MSG_SIZE] = {0};
char tcp_target[] = {192, 168, 250, 252};
uint16_t tcp_port = LWIP_TARGET_PORT;
char tcp_demo_msg[LWIP_TEST_MSG_SIZE] = {0};
char tcp_demo_ip[] = {192, 168, 250, 252};
u16_t tcp_demo_port = LWIP_TARGET_PORT;
/******************************************************************************/
static void LwipTcpSendTask(void *arg)
{
lw_notice("LwipTcpSendTask start.\n");
int fd = -1;
fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0)
{
lw_notice("Socket error\n");
lw_error("Socket error\n");
return;
}
@@ -63,7 +50,7 @@ static void LwipTcpSendTask(void *arg)
if (connect(fd, (struct sockaddr *)&tcp_sock, sizeof(struct sockaddr)))
{
lw_notice("Unable to connect\n");
lw_error("Unable to connect\n");
closesocket(fd);
return;
}
@@ -71,9 +58,9 @@ static void LwipTcpSendTask(void *arg)
lw_notice("tcp connect success, start to send.\n");
lw_notice("\n\nTarget Port:%d\n\n", tcp_sock.sin_port);
sendto(fd, tcp_send_msg, strlen(tcp_send_msg), 0, (struct sockaddr*)&tcp_sock, sizeof(struct sockaddr));
sendto(fd, tcp_demo_msg, strlen(tcp_demo_msg), 0, (struct sockaddr*)&tcp_sock, sizeof(struct sockaddr));
lw_notice("Send tcp msg: %s ", tcp_send_msg);
lw_notice("Send tcp msg: %s ", tcp_demo_msg);
closesocket(fd);
return;
@@ -82,31 +69,31 @@ static void LwipTcpSendTask(void *arg)
void LwipTcpSendTest(int argc, char *argv[])
{
LwipTcpSocketParamType param;
memset(tcp_send_msg, 0, MSG_SIZE);
memset(tcp_demo_msg, 0, LWIP_TEST_MSG_SIZE);
if(argc >= 2)
{
strncpy(tcp_send_msg, argv[1], strlen(argv[1]));
strncpy(tcp_demo_msg, argv[1], strlen(argv[1]));
}
else
{
strncpy(tcp_send_msg, "hello world", strlen("hello world"));
strncpy(tcp_demo_msg, "hello world", strlen("hello world"));
}
strcat(tcp_send_msg, "\r\n");
strcat(tcp_demo_msg, "\r\n");
if(argc >= 3)
{
if(sscanf(argv[2], "%d.%d.%d.%d:%d", &tcp_target[0], &tcp_target[1], &tcp_target[2], &tcp_target[3], &tcp_port) == EOK)
if(sscanf(argv[2], "%d.%d.%d.%d:%d", &tcp_demo_ip[0], &tcp_demo_ip[1], &tcp_demo_ip[2], &tcp_demo_ip[3], &tcp_demo_port) == EOK)
{
sscanf(argv[2], "%d.%d.%d.%d", &tcp_target[0], &tcp_target[1], &tcp_target[2], &tcp_target[3]);
sscanf(argv[2], "%d.%d.%d.%d", &tcp_demo_ip[0], &tcp_demo_ip[1], &tcp_demo_ip[2], &tcp_demo_ip[3]);
}
}
lw_notice("get ipaddr %d.%d.%d.%d:%d\n", tcp_target[0], tcp_target[1], tcp_target[2], tcp_target[3], tcp_port);
lwip_config_tcp(lwip_ipaddr, lwip_netmask, tcp_target);
lw_notice("get ipaddr %d.%d.%d.%d:%d\n", tcp_demo_ip[0], tcp_demo_ip[1], tcp_demo_ip[2], tcp_demo_ip[3], tcp_demo_port);
lwip_config_tcp(lwip_ipaddr, lwip_netmask, tcp_demo_ip);
memcpy(param.ip, tcp_target, 4);
param.port = tcp_port;
param.buf = malloc(MSG_SIZE);
memcpy(param.buf, tcp_send_msg, MSG_SIZE);
memcpy(param.ip, tcp_demo_ip, 4);
param.port = tcp_demo_port;
param.buf = malloc(LWIP_TEST_MSG_SIZE);
memcpy(param.buf, tcp_demo_msg, LWIP_TEST_MSG_SIZE);
sys_thread_new("tcp send", LwipTcpSendTask, &param, LWIP_TASK_STACK_SIZE, LWIP_DEMO_TASK_PRIO);
}
Ubiquitous/XiZi/resources/ethernet/cmd_lwip/lwip_udp_demo.c
+23 -26
View File
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2021 AIIT XUOS Lab
* Copyright (c) 2022 AIIT XUOS Lab
* XiUOS is licensed under Mulan PSL v2.
* You can use this software according to the terms and conditions of the Mulan PSL v2.
* You may obtain a copy of Mulan PSL v2 at:
@@ -15,25 +15,23 @@
* @brief One UDP demo based on LwIP
* @version 1.0
* @author AIIT XUOS Lab
* @date 2021-05-29
* @date 2022-03-21
*/
#include <transform.h>
#include <xizi.h>
#include "board.h"
#include "sys_arch.h"
#include "lwip/udp.h"
#include <lwip/sockets.h>
#include "lwip/sys.h"
#include "lwip/sockets.h"
#define UDP_TASK_STACK_SIZE 4096
#define UDP_TASK_PRIO 15
#define PBUF_SIZE 27
static struct udp_pcb *udpecho_raw_pcb;
char udp_demo_ip[] = {192, 168, 250, 252};
uint16_t udp_demo_port = LWIP_TARGET_PORT;
u16_t udp_demo_port = LWIP_TARGET_PORT;
char hello_str[] = {"hello world\r\n"};
char udp_send_msg[] = "\n\nThis one is UDP pkg. Congratulations on you.\n\n";
char udp_demo_msg[] = "\nThis one is UDP package!!!\n";
/******************************************************************************/
@@ -47,7 +45,7 @@ static void LwipUDPSendTask(void *arg)
socket_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (socket_fd < 0)
{
lw_print("Socket error\n");
lw_error("Socket error\n");
return;
}
@@ -59,45 +57,43 @@ static void LwipUDPSendTask(void *arg)
if (connect(socket_fd, (struct sockaddr *)&udp_sock, sizeof(struct sockaddr)))
{
lw_print("Unable to connect\n");
lw_error("Unable to connect\n");
closesocket(socket_fd);
return;
}
lw_print("UDP connect success, start to send.\n");
lw_print("\n\nTarget Port:%d\n\n", udp_sock.sin_port);
lw_notice("UDP connect success, start to send.\n");
lw_notice("\n\nTarget Port:%d\n\n", udp_sock.sin_port);
sendto(socket_fd, udp_send_msg, strlen(udp_send_msg), 0, (struct sockaddr*)&udp_sock, sizeof(struct sockaddr));
lw_notice("Send UDP msg: %s ", udp_send_msg);
sendto(socket_fd, udp_demo_msg, strlen(udp_demo_msg), 0, (struct sockaddr*)&udp_sock, sizeof(struct sockaddr));
lw_notice("Send UDP msg: %s ", udp_demo_msg);
closesocket(socket_fd);
return;
}
void *LwipUdpSendTest(int argc, char *argv[])
{
int result = 0;
sys_thread_t th_id;
memset(udp_send_msg, 0, sizeof(udp_send_msg));
memset(udp_demo_msg, 0, sizeof(udp_demo_msg));
if(argc == 1)
{
lw_print("lw: [%s] gw %d.%d.%d.%d\n", __func__, udp_demo_ip[0], udp_demo_ip[1], udp_demo_ip[2], udp_demo_ip[3]);
strncpy(udp_send_msg, hello_str, strlen(hello_str));
strncpy(udp_demo_msg, hello_str, strlen(hello_str));
}
else
{
strncpy(udp_send_msg, argv[1], strlen(argv[1]));
strncat(udp_send_msg, "\r\n", 2);
strncpy(udp_demo_msg, argv[1], strlen(argv[1]));
strncat(udp_demo_msg, "\r\n", 2);
if(argc == 3)
{
sscanf(argv[2], "%d.%d.%d.%d", &udp_demo_ip[0], &udp_demo_ip[1], &udp_demo_ip[2], &udp_demo_ip[3]);
}
}
lw_print("lw: [%s] gw %d.%d.%d.%d\n", __func__, udp_demo_ip[0], udp_demo_ip[1], udp_demo_ip[2], udp_demo_ip[3]);
lwip_config_net(lwip_ipaddr, lwip_netmask, lwip_gwaddr);
sys_thread_new("udp socket send", LwipUDPSendTask, NULL, LWIP_TASK_STACK_SIZE, LWIP_DEMO_TASK_PRIO);
lwip_config_net(lwip_ipaddr, lwip_netmask, udp_demo_ip);
sys_thread_new("udp send", LwipUDPSendTask, NULL, LWIP_TASK_STACK_SIZE, LWIP_DEMO_TASK_PRIO);
}
SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0) | SHELL_CMD_TYPE(SHELL_TYPE_CMD_MAIN) | SHELL_CMD_PARAM_NUM(3),
@@ -116,6 +112,7 @@ static void LwipUdpRecvTask(void *arg, struct udp_pcb *upcb, struct pbuf *p,
{
return;
}
udp_len = p->tot_len;
lw_notice("Receive data :%dB\r\n", udp_len);
@@ -158,5 +155,5 @@ void LwipUdpRecvTest(void)
}
SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0) | SHELL_CMD_TYPE(SHELL_TYPE_CMD_MAIN) | SHELL_CMD_PARAM_NUM(0),
UDPRecv, LwipUdpRecvTest, UDP server echo);
UDPRecv, LwipUdpRecvTest, UDP Receive echo);
Ubiquitous/XiZi/resources/include/flash_spi.h
-2
View File
@@ -21,9 +21,7 @@
#ifndef FLASH_SPI_H
#define FLASH_SPI_H
#ifdef RESOURCES_SPI_SFUD
#include <sfud_port.h>
#endif
#ifdef __cplusplus
extern "C" {
Ubiquitous/XiZi/tool/shell/letter-shell/shell_port.c
+16 -16
View File
@@ -1,12 +1,12 @@
/**
* @file shell_port.c
* @author Letter (NevermindZZT@gmail.com)
* @brief
* @brief
* @version 0.1
* @date 2019-02-22
*
*
* @copyright (c) 2019 Letter
*
*
*/
#include "xizi.h"
@@ -26,11 +26,11 @@ char *shellBuffer;
ShellFs shellFs;
char *shellPathBuffer;
HardwareDevType console;
HardwareDevType console;
/**
* @brief Shell write
*
* @brief Shell write
*
* @param data write data
*/
void userShellWrite(char data)
@@ -40,7 +40,7 @@ void userShellWrite(char data)
/**
* @brief shell read
*
*
* @param data read data
* @return char read status
*/
@@ -62,7 +62,7 @@ signed char userShellRead(char *data)
#ifdef SHELL_ENABLE_FILESYSTEM
/**
* @brief list file
*
*
* @param path path
* @param buffer result buffer
* @param maxLen the maximum buffer size
@@ -86,14 +86,14 @@ size_t userShellListDir(char *path, char *buffer, size_t maxLen)
#endif
/**
* @brief Initialize the shell
*
* @brief Initialize the shell
*
*/
int userShellInit(void)
{
shellBuffer = x_malloc(512*sizeof(char));
#ifdef SHELL_ENABLE_FILESYSTEM
shellPathBuffer = x_malloc(512*sizeof(char));
shellPathBuffer[0] = '/';
@@ -102,7 +102,7 @@ int userShellInit(void)
shellFs.listdir = userShellListDir;
shellFsInit(&shellFs, shellPathBuffer, 512);
shellSetPath(&shell, shellPathBuffer);
#endif
#endif
shell.write = userShellWrite;
shell.read = userShellRead;
@@ -114,13 +114,13 @@ int userShellInit(void)
serial_dev_param->serial_set_mode = 0;
serial_dev_param->serial_stream_mode = SIGN_OPER_STREAM;
BusDevOpen(console);
shellInit(&shell, shellBuffer, 4096);
shellInit(&shell, shellBuffer, 512);
int32 tid;
tid = KTaskCreate("letter-shell",
shellTask, &shell,
SHELL_TASK_STACK_SIZE, SHELL_TASK_PRIORITY);
StartupKTask(tid);
return 0;
}