X-Git-Url: http://git.linex4red.de/pub/pl2303-ft232-gpio.git/blobdiff_plain/5a2db3745964d6cd121a088dffcd28fe1d54ab2e..7cde69e0d8f5bd8e32e34b6f6db4372f473b5a05:/ft232r.c

diff --git a/ft232r.c b/ft232r.c
new file mode 100644
index 0000000..e8a558f
--- /dev/null
+++ b/ft232r.c
@@ -0,0 +1,114 @@
+#include <stdio.h>
+#include <stdlib.h>
+/* According to POSIX.1-2001 */
+#include <sys/select.h>
+#include <string.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <libusb.h>
+#include <getopt.h>
+
+
+#define _GNU_SOURCE
+#include <getopt.h>
+
+
+#define I_VENDOR_NUM        0x0403
+#define I_PRODUCT_NUM       0x6001
+#define BITMODE_CBUS        0x20
+#define BITMODE_RESET       0x00
+
+#define FTDI_SIO_SET_BITMODE 11 /* Set the bitmode */
+#define FTDI_SIO_READ_PINS 12   /* Read pins in bitmode */
+
+#define FTDI_SIO_SET_BITMODE_REQUEST FTDI_SIO_SET_BITMODE
+#define FTDI_SIO_SET_BITMODE_REQUEST_TYPE 0x40
+
+#define FTDI_SIO_READ_PINS_REQUEST FTDI_SIO_READ_PINS
+#define FTDI_SIO_READ_PINS_REQUEST_TYPE 0xC0
+
+int get_device_vid()
+{
+	return I_VENDOR_NUM;
+}
+
+int get_device_pid()
+{
+	return I_PRODUCT_NUM;
+}
+
+/* Get current GPIO register from PL2303 */
+unsigned char gpio_read_reg(libusb_device_handle *h)
+{
+	unsigned char buf;
+	int bytes = libusb_control_transfer(
+		h,             // handle obtained with usb_open()
+		FTDI_SIO_READ_PINS_REQUEST_TYPE, // bRequestType
+		FTDI_SIO_READ_PINS_REQUEST,      // bRequest
+		0,              // wValue
+		0,              // wIndex
+		&buf,             // pointer to destination buffer
+		1,  // wLength
+		1000
+		);
+	handle_error(bytes);
+	return buf;
+}
+
+void gpio_write_reg(libusb_device_handle *h, unsigned short reg)
+{
+	int bytes = libusb_control_transfer(
+		h,             // handle obtained with usb_open()
+		FTDI_SIO_SET_BITMODE_REQUEST_TYPE, //bRequestType
+		FTDI_SIO_SET_BITMODE_REQUEST, // bRequest
+		reg,              // wValue
+		0,              // wIndex
+		0,             // pointer to destination buffer
+		0,  // wLength
+		1000
+		);
+	handle_error(bytes);
+
+}
+
+void gpio_out(libusb_device_handle *h, int gpio, int value)
+{
+	unsigned char cbus_mask;
+
+	if ((gpio < 0) || (gpio > 3))
+		return;
+
+	cbus_mask = gpio_read_reg(h);
+	cbus_mask |= ((1 << gpio) << 4);
+	if (value)
+		cbus_mask |= (1 << gpio);
+	else
+		cbus_mask &= ~(1 << gpio);
+	gpio_write_reg(h, (BITMODE_CBUS << 8) | cbus_mask);
+}
+
+void gpio_in(libusb_device_handle *h, int gpio, int pullup)
+{
+	unsigned char cbus_mask;
+
+	if ((gpio < 0) || (gpio > 3))
+		return;
+
+	cbus_mask = gpio_read_reg(h);
+	cbus_mask &= ~((1 << gpio) << 4);
+	gpio_write_reg(h, (BITMODE_CBUS << 8) | cbus_mask);
+}
+
+int gpio_read(libusb_device_handle *h, int gpio)
+{
+	unsigned char r = gpio_read_reg(h);
+
+	if ((gpio < 0) || (gpio > 3))
+		return 0;
+	return (r & (1 << gpio)) ? 1 : 0;
+}
+