| 0,0 → 1,513 |
|---|
| /* |
| * i2c_usb.c - test application for the i2c-tiny-usb interface |
| * http://www.harbaum.org/till/i2c_tiny_usb |
| * |
| * |
| */ |
| |
| // #define NO_USB |
| |
| /* Includes */ |
| #include <hildon/hildon-program.h> |
| |
| #include <gtk/gtkmain.h> |
| #include <gtk/gtklabel.h> |
| |
| #include <glib.h> |
| #include <errno.h> |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <usb.h> |
| |
| /* ds1621 chip address (A0-A2 tied low) */ |
| #define DS1621_ADDR 0x48 |
| |
| /* pcf8574 chip address (A0-A2 tied low) */ |
| #define PCF8574_ADDR 0x20 |
| |
| #define LOOPS 100 |
| |
| #define USB_CTRL_IN (USB_TYPE_CLASS | USB_ENDPOINT_IN) |
| #define USB_CTRL_OUT (USB_TYPE_CLASS) |
| |
| /* the vendor and product id was donated by ftdi ... many thanks!*/ |
| #define I2C_TINY_USB_VID 0x0403 |
| #define I2C_TINY_USB_PID 0xc631 |
| |
| #define I2C_M_RD 0x01 |
| |
| /* commands via USB, must e.g. match command ids firmware */ |
| #define CMD_ECHO 0 |
| #define CMD_GET_FUNC 1 |
| #define CMD_SET_DELAY 2 |
| #define CMD_GET_STATUS 3 |
| #define CMD_I2C_IO 4 |
| #define CMD_I2C_BEGIN 1 // flag to I2C_IO |
| #define CMD_I2C_END 2 // flag to I2C_IO |
| |
| #define STATUS_IDLE 0 |
| #define STATUS_ADDRESS_ACK 1 |
| #define STATUS_ADDRESS_NAK 2 |
| |
| usb_dev_handle *handle = NULL; |
| gboolean pcf8574_present = 0; |
| gboolean ds1621_present = 0; |
| |
| /* global reference to main window */ |
| HildonWindow *window; |
| void error(char *msg, char *parm); |
| |
| /* write a set of bytes to the i2c_tiny_usb device */ |
| int i2c_tiny_usb_write(int request, int value, int index) { |
| if(usb_control_msg(handle, USB_CTRL_OUT, request, |
| value, index, NULL, 0, 1000) < 0) { |
| error("USB error: %s", usb_strerror()); |
| return -1; |
| } |
| return 1; |
| } |
| |
| /* read a set of bytes from the i2c_tiny_usb device */ |
| int i2c_tiny_usb_read(unsigned char cmd, void *data, int len) { |
| int nBytes; |
| |
| /* send control request and accept return value */ |
| nBytes = usb_control_msg(handle, |
| USB_CTRL_IN, |
| cmd, 0, 0, data, len, 1000); |
| |
| if(nBytes < 0) { |
| error("USB error: %s", usb_strerror()); |
| return nBytes; |
| } |
| |
| return 0; |
| } |
| |
| /* get i2c usb interface firmware version */ |
| void i2c_tiny_usb_get_func(GtkWidget *vbox) { |
| unsigned long func; |
| |
| if(i2c_tiny_usb_read(CMD_GET_FUNC, &func, sizeof(func)) == 0) { |
| char str[64]; |
| |
| sprintf(str, "Functionality = %lx\n", func); |
| gtk_box_pack_start(GTK_BOX(vbox), gtk_label_new(str), FALSE, FALSE, 0); |
| } else |
| gtk_box_pack_start(GTK_BOX(vbox), |
| gtk_label_new("Unable to read functionality"), |
| FALSE, FALSE, 0); |
| } |
| |
| /* set a value in the I2C_USB interface */ |
| void i2c_tiny_usb_set(unsigned char cmd, int value) { |
| if(usb_control_msg(handle, |
| USB_TYPE_VENDOR, cmd, value, 0, |
| NULL, 0, 1000) < 0) { |
| error("USB error: %s", usb_strerror()); |
| } |
| } |
| |
| /* get the current transaction status from the i2c_tiny_usb interface */ |
| int i2c_tiny_usb_get_status(void) { |
| int i; |
| unsigned char status; |
| |
| if((i=i2c_tiny_usb_read(CMD_GET_STATUS, &status, sizeof(status))) < 0) { |
| error("Error reading status", NULL); |
| return i; |
| } |
| |
| return status; |
| } |
| |
| /* write command and read an 8 or 16 bit value from the given chip */ |
| int i2c_read_with_cmd(unsigned char addr, char cmd, int length) { |
| unsigned char result[2]; |
| |
| if((length < 0) || (length > sizeof(result))) { |
| error("Request exceeds buffer size", NULL); |
| return -1; |
| } |
| |
| /* write one byte register address to chip */ |
| if(usb_control_msg(handle, USB_CTRL_OUT, |
| CMD_I2C_IO + CMD_I2C_BEGIN |
| + ((!length)?CMD_I2C_END:0), |
| 0, addr, &cmd, 1, |
| 1000) < 1) { |
| error("USB error: %s", usb_strerror()); |
| return -1; |
| } |
| |
| if(i2c_tiny_usb_get_status() != STATUS_ADDRESS_ACK) { |
| error("Write command status failed!", NULL); |
| return -1; |
| } |
| |
| // just a test? return ok |
| if(!length) return 0; |
| |
| if(usb_control_msg(handle, |
| USB_CTRL_IN, |
| CMD_I2C_IO + CMD_I2C_END, |
| I2C_M_RD, addr, (char*)result, length, |
| 1000) < 1) { |
| error("USB error: %s", usb_strerror()); |
| return -1; |
| } |
| |
| if(i2c_tiny_usb_get_status() != STATUS_ADDRESS_ACK) { |
| error("read data status failed", NULL); |
| return -1; |
| } |
| |
| // return 16 bit result |
| if(length == 2) |
| return 256*result[0] + result[1]; |
| |
| // return 8 bit result |
| return result[0]; |
| } |
| |
| /* write a single byte to the i2c client */ |
| int i2c_write_byte(unsigned char addr, char data) { |
| |
| /* write one byte register address to chip */ |
| if(usb_control_msg(handle, USB_CTRL_OUT, |
| CMD_I2C_IO + CMD_I2C_BEGIN + CMD_I2C_END, |
| 0, addr, &data, 1, |
| 1000) < 1) { |
| error("USB error: %s", usb_strerror()); |
| return -1; |
| } |
| |
| if(i2c_tiny_usb_get_status() != STATUS_ADDRESS_ACK) { |
| error("Write command status failed", NULL); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /* write a command byte and a single byte to the i2c client */ |
| int i2c_write_cmd_and_byte(unsigned char addr, char cmd, char data) { |
| char msg[2]; |
| |
| msg[0] = cmd; |
| msg[1] = data; |
| |
| /* write one byte register address to chip */ |
| if(usb_control_msg(handle, USB_CTRL_OUT, |
| CMD_I2C_IO + CMD_I2C_BEGIN + CMD_I2C_END, |
| 0, addr, msg, 2, |
| 1000) < 1) { |
| error("USB error: %s", usb_strerror()); |
| return -1; |
| } |
| |
| if(i2c_tiny_usb_get_status() != STATUS_ADDRESS_ACK) { |
| error("Write command status failed", NULL); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /* write a command byte and a 16 bit value to the i2c client */ |
| int i2c_write_cmd_and_word(unsigned char addr, char cmd, int data) { |
| char msg[3]; |
| |
| msg[0] = cmd; |
| msg[1] = data >> 8; |
| msg[2] = data & 0xff; |
| |
| /* write one byte register address to chip */ |
| if(usb_control_msg(handle, USB_CTRL_OUT, |
| CMD_I2C_IO + CMD_I2C_BEGIN + CMD_I2C_END, |
| 0, addr, msg, 3, |
| 1000) < 1) { |
| error("USB error: %s", usb_strerror()); |
| return -1; |
| } |
| |
| if(i2c_tiny_usb_get_status() != STATUS_ADDRESS_ACK) { |
| error("Write command status failed", NULL); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /* read ds1621 control register */ |
| void ds1621_read_control(void) { |
| int result; |
| |
| do { |
| result = i2c_read_with_cmd(DS1621_ADDR, 0xac, 1); |
| } while(!(result & 0x80)); |
| } |
| |
| /************************** GUI related code ************************/ |
| |
| static void |
| button_clicked (GtkButton* button, gpointer data) { |
| GtkWidget **checkBits = (GtkWidget**)data; |
| int i, value = 0; |
| |
| for(i=0;i<8;i++) { |
| value <<= 1; |
| |
| if(GTK_WIDGET_STATE(checkBits[i])) |
| value |= 1; |
| } |
| |
| #ifndef NO_USB |
| if(pcf8574_present) |
| i2c_write_byte(PCF8574_ADDR, value); |
| #endif |
| } |
| |
| static gboolean |
| update_temperature(gpointer data) { |
| GtkLabel *label = (GtkLabel*)data; |
| char str[32]; |
| int temp, counter, slope; |
| |
| /* just write command 0xee to start conversion */ |
| if(i2c_read_with_cmd(DS1621_ADDR, 0xee, 0) < 0) |
| return 0; |
| |
| ds1621_read_control(); |
| |
| temp = i2c_read_with_cmd(DS1621_ADDR, 0xaa, 2); |
| if(temp < 0) return 0; |
| |
| /* read counter and slope values */ |
| counter = i2c_read_with_cmd(DS1621_ADDR, 0xa8, 1); |
| slope = i2c_read_with_cmd(DS1621_ADDR, 0xa9, 1); |
| |
| /* use counter and slope to adjust temperature (see ds1621 datasheet) */ |
| temp = (temp & 0xff00) - 256/4; |
| temp += 256 * (slope - counter) / slope; |
| |
| sprintf(str, "%d.%03d °C", temp>>8, 1000 * (temp & 0xff) / 256); |
| gtk_label_set_text(label, str); |
| |
| return 1; |
| } |
| |
| void error(char *msg, char *parm) { |
| GtkWidget *dialog; |
| |
| dialog = gtk_message_dialog_new(GTK_WINDOW(window), |
| GTK_DIALOG_DESTROY_WITH_PARENT, |
| GTK_MESSAGE_ERROR, |
| GTK_BUTTONS_CLOSE, |
| msg, parm); |
| gtk_dialog_run(GTK_DIALOG(dialog)); |
| gtk_widget_destroy(dialog); |
| } |
| |
| int main(int argc, char *argv[]) { |
| /* Create needed variables */ |
| HildonProgram *program; |
| int i; |
| |
| /* pcf8574 parallel port interface */ |
| GtkWidget *vbox; |
| GtkWidget *ds1621Frame; |
| GtkWidget *tempLabel; |
| GtkWidget *pcf8574Frame; |
| GtkWidget *hbox, *buttonBox; |
| GtkWidget *checkBits[8]; |
| GSource *temp_timer_src; |
| |
| struct usb_bus *bus; |
| struct usb_device *dev; |
| int ret; |
| |
| /* Initialize the GTK. */ |
| gtk_init(&argc, &argv); |
| |
| /* Create the hildon program and setup the title */ |
| program = HILDON_PROGRAM(hildon_program_get_instance()); |
| g_set_application_name("I²C-Tiny-USB Demo"); |
| |
| /* Create HildonWindow and set it to HildonProgram */ |
| window = HILDON_WINDOW(hildon_window_new()); |
| hildon_program_add_window(program, window); |
| |
| /************* main view **************/ |
| |
| gtk_container_add(GTK_CONTAINER(window), |
| GTK_WIDGET(vbox = gtk_vbox_new(FALSE, 0))); |
| |
| /************* hardware initialization **************/ |
| #ifndef NO_USB |
| usb_init(); |
| |
| usb_find_busses(); |
| usb_find_devices(); |
| |
| for(bus = usb_get_busses(); bus; bus = bus->next) { |
| for(dev = bus->devices; dev; dev = dev->next) { |
| if((dev->descriptor.idVendor == I2C_TINY_USB_VID) && |
| (dev->descriptor.idProduct == I2C_TINY_USB_PID)) { |
| char str[128]; |
| |
| sprintf(str, "\nI²C-Tiny-USB device on bus %s device %s", |
| bus->dirname, dev->filename); |
| |
| gtk_box_pack_start(GTK_BOX(vbox), gtk_label_new(str), FALSE, FALSE, 0); |
| |
| /* open device */ |
| if(!(handle = usb_open(dev))) { |
| error("Cannot open the device: %s", usb_strerror()); |
| exit(EIO); |
| } |
| break; |
| } |
| } |
| } |
| |
| if(!handle) { |
| error("No i2c_tiny_usb device attached", NULL); |
| exit(ENODEV); |
| } |
| |
| /* Get exclusive access to interface 0 */ |
| ret = usb_claim_interface(handle, 0); |
| if (ret != 0) { |
| error("USB error: %s", usb_strerror()); |
| exit(EPERM); |
| } |
| |
| /* do some testing */ |
| i2c_tiny_usb_get_func(vbox); |
| |
| /* try to set i2c clock to 100kHz (10us), will actually result in ~50kHz */ |
| /* since the software generated i2c clock isn't too exact. in fact setting */ |
| /* it to 10us doesn't do anything at all since this already is the default */ |
| i2c_tiny_usb_set(CMD_SET_DELAY, 10); |
| #else |
| gtk_box_pack_start(GTK_BOX(vbox), gtk_label_new("\nNO_USB option set"), |
| FALSE, FALSE, 0); |
| gtk_box_pack_start(GTK_BOX(vbox), gtk_label_new("No functions available\n"), |
| FALSE, FALSE, 0); |
| #endif |
| |
| /************* create ds1621 frame **************/ |
| |
| gtk_container_add(GTK_CONTAINER(vbox), |
| GTK_WIDGET(ds1621Frame = gtk_frame_new(" ds1621 "))); |
| |
| gtk_container_add(GTK_CONTAINER(ds1621Frame), |
| GTK_WIDGET(hbox = gtk_hbox_new(FALSE, 0))); |
| |
| gtk_box_pack_start(GTK_BOX(hbox), gtk_label_new("Temperature:"), |
| FALSE, FALSE, 32); |
| |
| gtk_box_pack_start(GTK_BOX(hbox), tempLabel = gtk_label_new("--- °C"), |
| FALSE, FALSE, 0); |
| |
| #ifndef NO_USB |
| /* try to access ds1621 at address DS1621_ADDR */ |
| if(usb_control_msg(handle, USB_CTRL_IN, |
| CMD_I2C_IO + CMD_I2C_BEGIN + CMD_I2C_END, |
| 0, DS1621_ADDR, NULL, 0, |
| 1000) < 0) { |
| error("USB error: %s", usb_strerror()); |
| goto quit; |
| } |
| |
| if(i2c_tiny_usb_get_status() == STATUS_ADDRESS_ACK) { |
| ds1621_present = 1; |
| |
| /* activate one shot mode */ |
| if(i2c_write_cmd_and_byte(DS1621_ADDR, 0xac, 0x01) < 0) |
| goto quit; |
| |
| /* wait 10ms */ |
| usleep(10000); |
| |
| /* build an update timer for the temperature display */ |
| temp_timer_src = g_timeout_source_new(1000); |
| g_source_set_callback(temp_timer_src, update_temperature, tempLabel, NULL); |
| g_source_attach (temp_timer_src, NULL); |
| g_source_unref(temp_timer_src); |
| } else |
| gtk_frame_set_label((GtkFrame*)ds1621Frame, " ds1621 - not found "); |
| #endif |
| |
| /************* create pcf8574 frame **************/ |
| |
| /* create a frame for the pcf8574 elements */ |
| gtk_container_add(GTK_CONTAINER(vbox), |
| GTK_WIDGET(pcf8574Frame = gtk_frame_new(" pcf8574 "))); |
| |
| gtk_container_add(GTK_CONTAINER(pcf8574Frame), |
| GTK_WIDGET(hbox = gtk_hbox_new(FALSE, 0))); |
| |
| gtk_box_pack_start(GTK_BOX(hbox), gtk_label_new("Output bits:"), |
| FALSE, FALSE, 32); |
| |
| /* create a button box for the eight buttons */ |
| gtk_box_pack_start(GTK_BOX(hbox), buttonBox = gtk_hbutton_box_new(), |
| FALSE, FALSE, 0); |
| |
| gtk_button_box_set_child_size((GtkButtonBox*)buttonBox, 0, 0); |
| |
| /* add the eight buttons */ |
| for(i=0;i<8;i++) { |
| gtk_container_add(GTK_CONTAINER(buttonBox), |
| GTK_WIDGET(checkBits[i] = gtk_check_button_new())); |
| |
| g_signal_connect(G_OBJECT(checkBits[i]), "clicked", |
| G_CALLBACK(button_clicked), checkBits); |
| } |
| |
| #ifndef NO_USB |
| /* try to access pcf8574 at address PCF8574_ADDR */ |
| if(usb_control_msg(handle, USB_CTRL_IN, |
| CMD_I2C_IO + CMD_I2C_BEGIN + CMD_I2C_END, |
| 0, PCF8574_ADDR, NULL, 0, |
| 1000) < 0) { |
| |
| error("USB error: %s", usb_strerror()); |
| goto quit; |
| } |
| |
| if(i2c_tiny_usb_get_status() == STATUS_ADDRESS_ACK) { |
| pcf8574_present = 1; |
| i2c_write_byte(PCF8574_ADDR, 0x00); /* default value */ |
| } else |
| gtk_frame_set_label((GtkFrame*)pcf8574Frame, " pcf8574 - not found "); |
| #endif |
| |
| /*************************** *************************/ |
| |
| gtk_box_pack_start(GTK_BOX(vbox), |
| gtk_label_new("\nhttp://www.harbaum.org/till/i2c_tiny_usb\n"), |
| FALSE, FALSE, 0); |
| |
| /* begin the main application */ |
| gtk_widget_show_all(GTK_WIDGET(window)); |
| |
| /* Connect signal to X in the upper corner */ |
| g_signal_connect(G_OBJECT(window), "delete_event", |
| G_CALLBACK(gtk_main_quit), NULL); |
| |
| gtk_main(); |
| |
| quit: |
| ret = usb_release_interface(handle, 0); |
| if (ret) |
| error("USB error: %s\n", usb_strerror()); |
| |
| usb_close(handle); |
| |
| return 0; |
| } |