4.5http OTA远程升级
本节我们使用开发板的http来完成固件OTA远程升级，由于http协议处在tcp/ip协议的应用层，tcp协议工作在传输层，只需要在tcp传输层中按照http协议中的数据格式，发送数据就可以完成http传输数据。在SDK源码中打开宏定义 DEMO_HTTP 和 DEMO_CONNECT_NET。在程序中编写需要传入的http ota固件地址。
int t_http_fwup(char url)
{
HTTPParameters httpParams;
memset(&httpParams, 0, sizeof(HTTPParameters));
if (url == NULL)
{
httpParams.Uri = "http://192.168.1.100:8080/WM_W800_SEC.img";
}
else
{
httpParams.Uri = url;
}
printf("Location: %s\n",httpParams.Uri);
httpParams.Verbose = TRUE;
return http_fwup(httpParams);
}
接下来编写服务升级流程：
int http_fwup(HTTPParameters ClientParams)
{
char Buffer = NULL;
char token[32];
char headRange[32] = {0};
int nRetCode = 0;
u32 content_length=0, size=32;
u32 partLen;
u32 totalLen = 0;
u32 recvLen = 0;
IMAGE_HEADER_PARAM_ST *booter;
if USE_BREAK_POINT_RESUME == 0
u32 breakFlag = 0;
u32 breakLen = 0;
endif
struct pbuf *p;
HTTP_SESSION_HANDLE pHTTP;
enum ota_state now_state = PREPARE_PACKET;
Buffer = (char*)tls_mem_alloc(HTTP_CLIENT_BUFFER_SIZE + FWUP_MSG_SIZE);
if (!Buffer)
return HTTP_CLIENT_ERROR_NO_MEMORY;
memset(Buffer, 0, HTTP_CLIENT_BUFFER_SIZE + FWUP_MSG_SIZE);
while(1)
{
switch(now_state)
{
case PREPARE_PACKET:
{
memset(token, 0, 32);
size = 32;
pHTTP = HTTPClientOpenRequest(0);
if USE_BREAK_POINT_RESUME
HTTPClientSetVerb(pHTTP,VerbGet);
sprintf(headRange, "bytes=%d-", recvLen);
if((nRetCode = HTTPClientAddRequestHeaders(pHTTP,"Range", headRange, 1))!= HTTP_CLIENT_SUCCESS){
now_state = QUIT_OTA;
}
else
if( recvLen != 0 ){
breakFlag = 1;
breakLen = 0;
}
endif
now_state = SETUP_LINK_AND_REQ;
}
break;
case SETUP_LINK_AND_REQ:
{
if( (nRetCode = HTTPClientSendRequest(pHTTP,ClientParams.Uri,NULL,0,FALSE,0,0)) != HTTP_CLIENT_SUCCESS ){
tls_os_time_delay(HZ*2);
now_state = SHUTDOWN_LINK;
}
else
now_state = RECV_RSP;
}
break;
case RECV_RSP:
{
if((nRetCode = HTTPClientRecvResponse(pHTTP, RECV_TIMEOUT)) != HTTP_CLIENT_SUCCESS)
now_state = SHUTDOWN_LINK;
else
now_state = HANDLE_HEADER;
}
break;
case HANDLE_HEADER:
{
if((nRetCode = HTTPClientFindFirstHeader(pHTTP, "content-length", (CHAR *)token, &size)) != HTTP_CLIENT_SUCCESS){
HTTPClientFindCloseHeader(pHTTP);
now_state = SHUTDOWN_LINK;
}
else
{
HTTPClientFindCloseHeader(pHTTP);
content_length = atol(strstr(token,":")+1);
printf("content_length: %d\n", content_length);
now_state = HANDLE_BODY;
if(recvLen == 0){
nRetCode = socket_fwup_accept(0, ERR_OK);
if(nRetCode != ERR_OK)
now_state = QUIT_OTA;
}
}
}
break;
case HANDLE_BODY:
{
partLen = 0;
while(nRetCode != HTTP_CLIENT_EOS )
{
u32 nSize = HTTP_CLIENT_BUFFER_SIZE;
nRetCode = HTTPClientReadData(pHTTP,Buffer+FWUP_MSG_SIZE,nSize,RECV_TIMEOUT,&nSize);
if( recvLen == 0 ){
booter =(IMAGE_HEADER_PARAM_ST *) (Buffer+FWUP_MSG_SIZE);
if (TRUE == tls_fwup_img_header_check(booter))
{
totalLen = booter->img_len + sizeof(IMAGE_HEADER_PARAM_ST);
if (booter->img_attr.b.signature)
{
totalLen += 128;
}
}
else
{
now_state = QUIT_OTA;
break;
}
}
if(nRetCode != HTTP_CLIENT_SUCCESS && nRetCode != HTTP_CLIENT_EOS){
now_state = SHUTDOWN_LINK;
break;
}
if USE_BREAK_POINT_RESUME == 0
if(breakFlag == 1){
breakLen += nSize;
if(breakLen <= recvLen){
continue;
}
else{
Buffer = Buffer+FWUP_MSG_SIZE+nSize-(breakLen-recvLen)-FWUP_MSG_SIZE;
nSize = (breakLen-recvLen);
breakFlag = 0;
}
}
endif
p = pbuf_alloc(PBUF_TRANSPORT, nSize + FWUP_MSG_SIZE, PBUF_REF);
while( !p){
tls_os_time_delay(1);
p = pbuf_alloc(PBUF_TRANSPORT, nSize + FWUP_MSG_SIZE, PBUF_REF);
}
if(recvLen == 0)
*(Buffer+0) = SOCKET_FWUP_START;
else if(nRetCode == HTTP_CLIENT_EOS && recvLen == (totalLen-nSize))
*(Buffer+0) = SOCKET_FWUP_END;
else
*(Buffer+0) = SOCKET_FWUP_DATA;
*(Buffer+1) = (nSize>>8) & 0xFF;
*(Buffer+2) = nSize & 0xFF;
p->payload = Buffer;
p->len = p->tot_len = nSize + FWUP_MSG_SIZE;
// Send received data to fwup thread and deal with socket issues.
s8 ret = socket_fwup_recv(0, p, ERR_OK);
if(ret != ERR_OK){
now_state = SHUTDOWN_LINK;
break;
}
else{
recvLen += nSize;
partLen += nSize;
printf("download %d / %d\n", recvLen, totalLen);
if(partLen == content_length){
now_state = SHUTDOWN_LINK;
break;
}
}
}
if (now_state == QUIT_OTA);
else
now_state = SHUTDOWN_LINK;
}
break;
case SHUTDOWN_LINK:
{
if(pHTTP){
HTTPClientCloseRequest(&pHTTP);
(recvLen == totalLen)?(now_state = QUIT_OTA):(now_state = PREPARE_PACKET);
}
}
break;
default:
break;
}
//printf("now_state %d\n", now_state);
if(now_state == QUIT_OTA)
break;
}
tls_mem_free(Buffer);
if(pHTTP)
HTTPClientCloseRequest(&pHTTP);
if(ClientParams.Verbose == TRUE)
{
printf("\n\nHTTP Client terminated %d (got %d kb)\n\n",nRetCode,(recvLen/ 1024));
}
if(nRetCode)
socket_fwup_err(0, nRetCode);
return nRetCode;
}
程序的测试需要开启动一个hfs 服务器，hfs服务器下载：链接：https://pan.baidu.com/s/1N7gL9f-nj9Qr_HJv43FYAg 提取码：6666
打开hfs服务器后端口改为8080，同时放上我们需要升级的固件，这里我们放了hello_world的img固件。
程序编译并下载到开发板。先在串口输入配网指令联网。
指令如：t-connect("@snail","ss559550")
接下来输入升级指令t-httpfwup=(http://192.168.2.103:8080/w800_ota.img)，串口可以看到升级进度，升级成功，自动运行新固件程序。
