I have the following code, which matches the example for 90%. I want to "flatten" the 3D model via parameterization. But the input and output do not have the same scale.
The question I have, how can we remain the same scale of the scaling. In the image below you can find the input and the output:
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Surface_mesh_parameterization/IO/File_off.h>
//#include <CGAL/Surface_mesh_parameterization/Circular_border_parameterizer_3.h>
//#include <CGAL/Surface_mesh_parameterization/Discrete_authalic_parameterizer_3.h>
//#include <CGAL/Surface_mesh_parameterization/Square_border_parameterizer_3.h>
//#include <CGAL/Surface_mesh_parameterization/Barycentric_mapping_parameterizer_3.h>
#include <CGAL/Surface_mesh_parameterization/Two_vertices_parameterizer_3.h>
#include <CGAL/Surface_mesh_parameterization/LSCM_parameterizer_3.h>
#include <CGAL/Surface_mesh_parameterization/Error_code.h>
#include <CGAL/Surface_mesh_parameterization/parameterize.h>
#include <CGAL/Polygon_mesh_processing/measure.h>
#include <cstdlib>
#include <iostream>
#include <fstream>
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::Point_2 Point_2;
typedef Kernel::Point_3 Point_3;
typedef CGAL::Surface_mesh<Kernel::Point_3> SurfaceMesh;
typedef boost::graph_traits<SurfaceMesh>::halfedge_descriptor halfedge_descriptor;
typedef boost::graph_traits<SurfaceMesh>::vertex_descriptor vertex_descriptor;
typedef boost::graph_traits<SurfaceMesh>::face_descriptor face_descriptor;
namespace SMP = CGAL::Surface_mesh_parameterization;
int main(int argc, char** argv)
{
std::ifstream in((argc > 1) ? argv[1] : "C:/Users/Niels/Desktop/CGAL/flatten.off");
if (!in) {
std::cerr << "Problem loading the input data" << std::endl;
return EXIT_FAILURE;
}
SurfaceMesh sm;
in >> sm;
// A halfedge on the border
halfedge_descriptor bhd = CGAL::Polygon_mesh_processing::longest_border(sm).first;
// The 2D points of the uv parametrisation will be written into this map
typedef SurfaceMesh::Property_map<vertex_descriptor, Point_2> UV_pmap;
UV_pmap uv_map = sm.add_property_map<vertex_descriptor, Point_2>("v:uv").first;
typedef SMP::Two_vertices_parameterizer_3<SurfaceMesh> Border_parameterizer;
typedef SMP::LSCM_parameterizer_3<SurfaceMesh, Border_parameterizer> Parameterizer;
SMP::Error_code err = SMP::parameterize(sm, Parameterizer(), bhd, uv_map);
if (err != SMP::OK) {
std::cerr << "Error: " << SMP::get_error_message(err) << std::endl;
return EXIT_FAILURE;
}
std::ofstream out("result.off");
SMP::IO::output_uvmap_to_off(sm, bhd, uv_map, out);
return EXIT_SUCCESS;
}
Update, but this runs infinite:
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/Surface_mesh_parameterization/IO/File_off.h>
//#include <CGAL/Surface_mesh_parameterization/Circular_border_parameterizer_3.h>
//#include <CGAL/Surface_mesh_parameterization/Discrete_authalic_parameterizer_3.h>
//#include <CGAL/Surface_mesh_parameterization/Square_border_parameterizer_3.h>
//#include <CGAL/Surface_mesh_parameterization/Barycentric_mapping_parameterizer_3.h>
#include <CGAL/Surface_mesh_parameterization/Two_vertices_parameterizer_3.h>
#include <CGAL/Surface_mesh_parameterization/LSCM_parameterizer_3.h>
#include <CGAL/Surface_mesh_parameterization/Error_code.h>
#include <CGAL/Surface_mesh_parameterization/parameterize.h>
#include <CGAL/Polygon_mesh_processing/measure.h>
#include <cstdlib>
#include <iostream>
#include <fstream>
typedef CGAL::Simple_cartesian<double> Kernel;
typedef Kernel::Point_2 Point_2;
typedef Kernel::Point_3 Point_3;
typedef CGAL::Surface_mesh<Kernel::Point_3> SurfaceMesh;
typedef boost::graph_traits<SurfaceMesh>::halfedge_descriptor halfedge_descriptor;
typedef boost::graph_traits<SurfaceMesh>::vertex_descriptor vertex_descriptor;
typedef boost::graph_traits<SurfaceMesh>::face_descriptor face_descriptor;
namespace SMP = CGAL::Surface_mesh_parameterization;
#include <CGAL/Surface_mesh_parameterization/ARAP_parameterizer_3.h>
int main(int argc, char** argv)
{
std::ifstream in((argc > 1) ? argv[1] : "FlatteningObject.off");
if (!in) {
std::cerr << "Problem loading the input data" << std::endl;
return EXIT_FAILURE;
}
SurfaceMesh sm;
in >> sm;
// A halfedge on the border
halfedge_descriptor bhd = CGAL::Polygon_mesh_processing::longest_border(sm).first;
// The 2D points of the uv parametrisation will be written into this map
typedef SurfaceMesh::Property_map<vertex_descriptor, Point_2> UV_pmap;
UV_pmap uv_map = sm.add_property_map<vertex_descriptor, Point_2>("v:uv").first;
typedef SMP::Two_vertices_parameterizer_3<SurfaceMesh> Border_parameterizer;
typedef SMP::LSCM_parameterizer_3<SurfaceMesh, Border_parameterizer> Parameterizer;
SMP::Error_code err = SMP::parameterize(
sm,
SMP::ARAP_parameterizer_3<SurfaceMesh, Border_parameterizer>(
Border_parameterizer(),
CGAL::Eigen_solver_traits<Eigen::SparseLU<CGAL::Eigen_sparse_matrix<double>::EigenType> >(),
1000,
50
),
bhd,
uv_map);
if (err != SMP::OK) {
std::cerr << "Error: " << SMP::get_error_message(err) << std::endl;
return EXIT_FAILURE;
}
std::ofstream out("result.off");
SMP::IO::output_uvmap_to_off(sm, bhd, uv_map, out);
return EXIT_SUCCESS;
}
I have had some success with using the ARAP method instead. The default 50 iterations was not actually enough and produced a crossed over mesh. Bumping up the iterations to 500 worked.
SMP::Error_code err = SMP::parameterize(
in,
SMP::ARAP_parameterizer_3<geometry::Mesh, Border_parameterizer>(
Border_parameterizer(),
CGAL::Eigen_solver_traits<Eigen::SparseLU<CGAL::Eigen_sparse_matrix<double>::EigenType> >(),
1000,
500),
bhd,
uv_map);
...Using commit bec70a6d52
I have this piece of code that I developed just to address a problem that I have in another large program that I am developing.
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <cstring>
#include <cstdlib>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <limits.h>
#include <string>
#include <iostream>
using namespace std;
void processLine (char []);
void readLine(char []);
const int LIMIT = 512;
int main(int argc, char *argv[])
{
char oneLine[LINE_MAX];
readLine(oneLine);
return 0;
}
void readLine(char line[])
{
processLine(line);
//Otherstuff
------------
}
void processLine(char line[])
{
pid_t process;
int child_status;
string input;
cout << "Input: ";
cin >> input;
process = fork();
if(process == 0)
{ // do nothing
}
else
{
//parent
if(input == "quit")
{
printf("Quit command found ! \nExiting ");
for(int i = 0;i < 3;i++)
{
printf(".");
fflush(stdout);
sleep(1);
}
printf("\n");
exit(0);
}
else
{
wait(&child_status);
}
}
}
My goal is simple, When the user enter quit.
I will just display
Quit command found
Exiting ...
And there is a delay of one second between each of these three dots.
However the output that I get is
Quit command found
Exiting . other stuff ..
However, what seems to happen is that the parent process returns and then executes other stuff from the calling function before it continues to print the other two dots. How would I avoid the parent process from doing that ?
Use waitpid() like this:
pid_t childPid;
childPid = fork();
...
int returnStatus;
waitpid(childPid, &returnStatus, 0); // Parent process waits here for child to terminate.
Use it here
if(childPid == 0) // fork succeeded
{
// Do something
exit(0);
}
else // Main (parent) process after fork succeeds
{
int returnStatus;
waitpid(childPid, &returnStatus, 0);
}
I am currently working to create a simple transfer protocol over Ethernet. I have a SP605 Xilinx evaluation board which I am using to debug the Ethernet portion of our project. I attempted to cannibalize the example but have so far been unsuccessful. Currently, the communication needs to only be one way. Currently, I am trying to see the data being sent with netcat. I also have wireshark open and am seeing the system get stuck repeatedly asking:
2217 1323.697811000 Xilinx_00:01:02 Broadcast
ARP 60 Who has 192.168.1.11? Tell 192.168.1.10
I can see the Host computer reply with:
2217 1323.697811000 Xilinx_00:01:02 Broadcast
ARP 60 Who has 192.168.1.11? Tell 192.168.1.10
I feel like I have some issues with the configuration but cannot figure out how what it is. I think it might have something to do with a not having a recv handler set but I am not sure.
Below is the code I am using. lwip_init() is mimicking the call from the examples provided by Xilinx.
/*
* main.c
*
* Created on: Sep 24, 2013
* Author: Ian
*/
#include <stdio.h>
#include <string.h>
#include <stdio.h>
#include "lwip/init.h"
#include "xparameters.h"
#include "netif/xadapter.h"
#include "xenv_standalone.h"
#include "platform_config.h"
#include "xparameters.h"
#include "xintc.h"
#include "xil_exception.h"
#include "mb_interface.h"
#include "xtmrctr_l.h"
#include "lwip/udp.h"
#include "lwipopts.h"
#include "xil_printf.h"
struct ip_addr ipaddr, ipaddr_remote, netmask, gw;
void udp_test(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port);
void print_ip(char *msg, struct ip_addr *ip)
{
print(msg);
xil_printf("%d.%d.%d.%d\r\n", ip4_addr1(ip), ip4_addr2(ip),
ip4_addr3(ip), ip4_addr4(ip));
}
void print_ip_settings(struct ip_addr *ip, struct ip_addr *mask, struct ip_addr *gw)
{
print_ip("Board IP: ", ip);
print_ip("Netmask : ", mask);
print_ip("Gateway : ", gw);
}
int main()
{
err_t error;
struct netif *netif, server_netif;
struct udp_pcb *udp_1;
struct pbuf *p;
char data[8] = "01234567";
u16_t Port;
Port = 69;
int count = 0;
int n = 0;
int buflen = 8;
/* the mac address of the board. this should be unique per board */
unsigned char mac_ethernet_address[] = { 0x00, 0x0a, 0x35, 0x00, 0x01, 0x02 };
netif = &server_netif;
xil_printf("\r\n\r\n");
xil_printf("-----lwIP RAW Application ------\r\n");
/* initliaze IP addresses to be used */
IP4_ADDR(&ipaddr_remote, 192, 168, 1, 11);
IP4_ADDR(&ipaddr, 192, 168, 1, 10);
IP4_ADDR(&netmask, 255, 255, 255, 0);
IP4_ADDR(&gw, 192, 168, 1, 1);
print_ip_settings(&ipaddr, &netmask, &gw);
lwip_init();
if (!xemac_add(netif, &ipaddr, &netmask, &gw, mac_ethernet_address, PLATFORM_EMAC_BASEADDR)) {
xil_printf("Error adding N/W interface\r\n");
return -1;
}
netif_set_default(netif);
netif_set_up(netif);
Xil_ExceptionEnable(); //Setup complete start interrupts
udp_1 = udp_new();
error = udp_bind(udp_1, IP_ADDR_ANY, Port);
if (error != 0)
{
xil_printf("Failed %d\r\n", error);
}
else if (error == 0)
{
xil_printf("Success\r\n");
}
error = udp_connect(udp_1, &ipaddr_remote, Port);
if (error != 0)
{
xil_printf("Failed %d\r\n", error);
}
else if (error == 0)
{
xil_printf("Success\r\n");
}
while(1)
{
count++;
xemacif_input(netif);
if (count == 100000)
{
p = pbuf_alloc(PBUF_TRANSPORT, buflen, PBUF_POOL);
if (!p) {
xil_printf("error allocating pbuf\r\n");
return ERR_MEM;
}
memcpy(p->payload, data, buflen);
udp_send(udp_1, p);
xil_printf("SEND\r\n");
count = 0;
pbuf_free(p);
}
}
data[1] = '2';
}
Ok, so basically here is what I found.
The Xilinx xapp1026 had issues with the sp605_AxiEth_32kb_Cache project when I used it. It was hanging at the start interrupts. I was not able to diagnose the project BUT I switched to the sp605_EthernetLite_32kb_Cache example project. I can only assume that the failure of the MicroBlaze interrupts to initialize caused the ARP to fail to get added and forced the system into the loop repeatedly. It is still unclear why the interrupt failed to initialize in the AxiEth example.
Once here I was able to get a program to work by stripping down the provided system and using the following code:
/*
* Copyright (c) 2007 Xilinx, Inc. All rights reserved.
*
* Xilinx, Inc.
* XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A
* COURTESY TO YOU. BY PROVIDING THIS DESIGN, CODE, OR INFORMATION AS
* ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION OR
* STANDARD, XILINX IS MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION
* IS FREE FROM ANY CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE
* FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION.
* XILINX EXPRESSLY DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO
* THE ADEQUACY OF THE IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO
* ANY WARRANTIES OR REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE
* FROM CLAIMS OF INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE.
*
*/
#include <stdio.h>
#include <string.h>
#include "lwip/udp.h"
#include "xparameters.h"
#include "netif/xadapter.h"
#include "platform.h"
#include "platform_config.h"
#include "lwipopts.h"
#ifndef __PPC__
#include "xil_printf.h"
#endif
void print_headers();
int start_applications();
int transfer_data();
void platform_enable_interrupts();
void lwip_init(void);
void tcp_fasttmr(void);
void tcp_slowtmr(void);
#if LWIP_DHCP==1
extern volatile int dhcp_timoutcntr;
err_t dhcp_start(struct netif *netif);
#endif
extern volatile int TxPerfConnMonCntr;
extern volatile int TcpFastTmrFlag;
extern volatile int TcpSlowTmrFlag;
void print_ip(char *msg, struct ip_addr *ip)
{
print(msg);
xil_printf("%d.%d.%d.%d\r\n", ip4_addr1(ip), ip4_addr2(ip),
ip4_addr3(ip), ip4_addr4(ip));
}
void print_ip_settings(struct ip_addr *ip, struct ip_addr *mask, struct ip_addr *gw)
{
print_ip("Board IP: ", ip);
print_ip("Netmask : ", mask);
print_ip("Gateway : ", gw);
}
int main()
{
struct netif *netif, server_netif;
struct ip_addr ipaddr, netmask, gw;
// Added stuff for the creation of a basic UDP
err_t error;
struct ip_addr ip_remote;
struct udp_pcb *udp_1;
struct pbuf *p;
char data[8] = "01234567";
u16_t Port = 12;
int buflen = 8;
int count = 0;
/* the mac address of the board. this should be unique per board */
unsigned char mac_ethernet_address[] = { 0x00, 0x0a, 0x35, 0x00, 0x01, 0x02 };
netif = &server_netif;
if (init_platform() < 0) {
xil_printf("ERROR initializing platform.\r\n");
return -1;
}
xil_printf("\r\n\r\n");
xil_printf("-----lwIP RAW Mode Demo Application ------\r\n");
/* initliaze IP addresses to be used */
#if (LWIP_DHCP==0)
IP4_ADDR(&ipaddr, 192, 168, 1, 10);
IP4_ADDR(&netmask, 255, 255, 255, 0);
IP4_ADDR(&gw, 192, 168, 1, 1);
print_ip_settings(&ipaddr, &netmask, &gw);
#endif
lwip_init();
#if (LWIP_DHCP==1)
ipaddr.addr = 0;
gw.addr = 0;
netmask.addr = 0;
#endif
/* Add network interface to the netif_list, and set it as default */
if (!xemac_add(netif, &ipaddr, &netmask, &gw, mac_ethernet_address, PLATFORM_EMAC_BASEADDR)) {
xil_printf("Error adding N/W interface\r\n");
return -1;
}
netif_set_default(netif);
/* specify that the network if is up */
netif_set_up(netif);
/* now enable interrupts */
platform_enable_interrupts();
#if (LWIP_DHCP==1)
/* Create a new DHCP client for this interface.
* Note: you must call dhcp_fine_tmr() and dhcp_coarse_tmr() at
* the predefined regular intervals after starting the client.
*/
dhcp_start(netif);
dhcp_timoutcntr = 24;
TxPerfConnMonCntr = 0;
while(((netif->ip_addr.addr) == 0) && (dhcp_timoutcntr > 0)) {
xemacif_input(netif);
if (TcpFastTmrFlag) {
tcp_fasttmr();
TcpFastTmrFlag = 0;
}
if (TcpSlowTmrFlag) {
tcp_slowtmr();
TcpSlowTmrFlag = 0;
}
}
if (dhcp_timoutcntr <= 0) {
if ((netif->ip_addr.addr) == 0) {
xil_printf("DHCP Timeout\r\n");
xil_printf("Configuring default IP of 192.168.1.10\r\n");
IP4_ADDR(&(netif->ip_addr), 192, 168, 1, 10);
IP4_ADDR(&(netif->netmask), 255, 255, 255, 0);
IP4_ADDR(&(netif->gw), 192, 168, 1, 1);
}
}
/* receive and process packets */
print_ip_settings(&(netif->ip_addr), &(netif->netmask), &(netif->gw));
#endif
/* start the application (web server, rxtest, txtest, etc..) */
xil_printf("Setup Done");
IP4_ADDR(&ip_remote, 192, 168, 1, 11);
udp_1 = udp_new();
error = udp_bind(udp_1, IP_ADDR_ANY, Port);
if (error != 0)
{
xil_printf("Failed %d\r\n", error);
}
else if (error == 0)
{
xil_printf("Success\r\n");
}
error = udp_connect(udp_1, &ip_remote, Port);
if (error != 0)
{
xil_printf("Failed %d\r\n", error);
}
else if (error == 0)
{
xil_printf("Success\r\n");
}
while (1)
{
xemacif_input(netif);
count++;
if (count == 80000)
{
p = pbuf_alloc(PBUF_TRANSPORT, buflen, PBUF_POOL);
if (!p) {
xil_printf("error allocating pbuf\r\n");
return ERR_MEM;
}
memcpy(p->payload, data, buflen);
udp_send(udp_1, p);
xil_printf("SEND\r\n");
count = 0;
pbuf_free(p);
}
}
/* never reached */
cleanup_platform();
return 0;
}
----Edit ----
So you know how people figure it out then don't leave an answer. Well here was my problem with the orginal code (I think..) the line of code xemacif_input(netif); gives the Ethernet the ability to process the arp call without it the FPGA will sending out the ARP and then not receiving it will ask repeatedly.
The previous code does appear to have the correct line of code in it. So it might have been a mistake in how the interrupts were configured.
I got this example working and implemented it in my project. If you have questions about this please ask and I will try and give the best answers I can.
I'm trying to create an Apache module using socket to connect to the other server. It works well and I can retrieve data, but I have encountered three problems.
I can't keep connection with my server (auto close after each request).
I get 2 errors for each request in error log AH00052: child pid 7970 exit signal Segmentation fault (11).
When I continuously press f5 on my browser get error "No data received".
This is my module's code:
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
#include <sys/select.h>
#include "httpd.h"
#include "http_config.h"
#include "http_protocol.h"
#include "ap_config.h"
static int sockfd = -1;
static struct sockaddr_in saddr;
/* The sample content handler */
static int search_handler(request_rec *r)
{
r->content_type = "text/html";
ap_rprintf(r,"sockfd = %d<br>", sockfd);
if(sockfd == -1){
sockfd = socket(AF_INET, SOCK_STREAM, 0);
struct hostent *server = gethostbyname("127.0.0.1");
if(server == NULL ) return DECLINED;
bzero((char *) &saddr, sizeof(saddr));
saddr.sin_family = AF_INET;
bcopy((char *)server->h_addr, (char *)&saddr.sin_addr.s_addr,server->h_length);
saddr.sin_port = htons(9999);
if(sockfd == -1) return DECLINED;
if(connect(sockfd, (struct sockaddr *)&saddr, sizeof(saddr)) < 0){
ap_rputs("Can't connect.\n", r);
return OK;
}
}
send(sockfd, r->args, strlen(r->args), 0);
fd_set read_sd;
FD_ZERO(&read_sd);
FD_SET(sockfd, &read_sd);
int sel = select(sockfd + 1, &read_sd, 0, 0, 0);
if(sel < 0) {close(sockfd);return DECLINED;}
if( sel == 0) {ap_rprintf(r, "time out."); return OK;}
char buf[5000];
if(recv(sockfd, buf, 5000, 0) <= 0) return DECLINED;
ap_rprintf(r, "%s<br>%d", buf, sockfd);
return OK;
}
static void search_register_hooks(apr_pool_t *p)
{
ap_hook_handler(search_handler, NULL, NULL, APR_HOOK_LAST);
}
/* Dispatch list for API hooks */
module AP_MODULE_DECLARE_DATA search_module = {
STANDARD20_MODULE_STUFF,
NULL, /* create per-dir config structures */
NULL, /* merge per-dir config structures */
NULL, /* create per-server config structures */
NULL, /* merge per-server config structures */
NULL, /* table of config file commands */
search_register_hooks /* register hooks */
};
How can I solve this?
Not a definite answer, but I believe you have to use apache pools for resource management in modules.
I am trying to learn how to write a device driver in linux, following some reference from google and ldd3. i am able to insert the module below but when i tried to open the device in an application the kernel crashed.
The code and build steps followed as below :
#include <linux/module.h> /* Needed by all modules */
#include <linux/kernel.h> /* Needed for KERN_INFO */
#include <linux/init.h> /* Needed for the macros */
#include <linux/ioport.h>
#include <asm/io.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <asm/uaccess.h>
#include <asm/irq.h>
#include <asm/param.h>
#include <linux/fs.h>
/* =============== Constant Definitions ============ */
#define SERIAL_IRQ 4
/* =============== Variable Definitions ============ */
static int SER_MAJOR = 0;
int ser_open(struct inode *inode, struct file *filp);
int ser_release(struct inode *inode, struct file *filp);
irqreturn_t my_ser_dev_isr(int irq,void *ser_data,struct pt_regs * pt_reg_var)
{
printk("\n\n ------- INTR raised -----------\n\n");
return 0;
}
int ser_open(struct inode *inode, struct file *filp)
{
if(request_irq(SERIAL_IRQ,&my_ser_dev_isr,1,"my_ser_dev_intr",NULL))
{
printk("\n interrupt req failed\n");
}
else
{
enable_irq(SERIAL_IRQ);
printk("\n!!!! ..obtained the requested interrupt and enabled\n");
}
}
int ser_release(struct inode *inode, struct file *filp)
{
disable_irq(SERIAL_IRQ);
free_irq(SERIAL_IRQ,NULL) ;
}
static struct file_operations ser_fops = {
open: ser_open,
release: ser_release
};
void *p = NULL;
irqreturn_t my_ser_dev_isr (int, void *, struct pt_regs *);
static int __init hello_start(void)
{
int ret_val=-1;
int result;
printk(KERN_INFO "Loading hello module...\n");
printk(KERN_INFO "Hello world\n");
result = register_chrdev(SER_MAJOR,"SER_DEV",&ser_fops);
if(result < 0)
{
printk(KERN_WARNING"Can't get major %d\n",SER_MAJOR);
return result;
}
if(SER_MAJOR == 0)
{
SER_MAJOR = result;
printk("SER DEV Major Number : %d",SER_MAJOR );
}
return 0;
}
static void __exit hello_end(void)
{
// free_irq(SERIAL_IRQ,NULL);
//release_region(0x0031,1);
printk(KERN_INFO "Goodbye Mr.\n");
}
module_init(hello_start);
module_exit(hello_end);
Makefile for module :
obj-m := hello.o
default:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
The application used for accesing is as follows :
#include <stdio.h> /* test.c */
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
static int dev;
int main(void)
{
char buff[40];
dev = open("/dev/my_ser_dev",O_RDONLY);
if(dev < 0)
{
printf( "Device Open ERROR!\n");
exit(1);
}
printf("Please push the GPIO_16 port!\n");
//read(dev,buff,40);
// scanf("%s",buff);
printf("%s\n",buff);
close(dev);
return 0;
}
insmod gave
[ 3837.312140] Loading hello module...
[ 3837.312147] Hello world
[ 3837.312218] SER DEV Major Number : 251
Then I created the special file using mknod /dev/my_ser_dev c 251 0
Executing the application caused kernel crash. I am using UBUNTU 3.2.0-23-generic-pae.
The function you are registering as your IRQ handler has the wrong prototype - it should be like
irqreturn_t irq_handler(int, void *);
Maybe you are referring to old documentation.