* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
-#include "ccdbg.h"
-#include <usb.h>
+/*
+ * libusb interface to the GPIO pins on a CP2103.
+ *
+ * Various magic constants came from the cp210x driver published by silabs.
+ */
+
+#include "cp-usb.h"
+#include <stdio.h>
+#include <errno.h>
+
+struct cp_usb {
+ usb_dev_handle *usb_dev;
+ uint8_t gpio;
+};
#define CP2101_UART 0x00
#define UART_ENABLE 0x0001
#define REQTYPE_DEVICE_TO_HOST 0xc1
static int
-cp_usb_gpio_get(struct ccdbg *dbg, uint8_t *gpio_get)
+cp_usb_gpio_get(struct cp_usb *cp, uint8_t *gpio_get)
{
- return usb_control_msg(dbg->usb_dev, /* dev */
+ return usb_control_msg(cp->usb_dev, /* dev */
0xc0, /* request */
0xff, /* requesttype */
0x00c2, /* value */
}
static int
-cp_usb_gpio_set(struct ccdbg *dbg, uint8_t mask, uint8_t value)
+cp_usb_gpio_set(struct cp_usb *cp, uint8_t mask, uint8_t value)
{
uint16_t gpio_set = ((uint16_t) value << 8) | mask;
- return usb_control_msg(dbg->usb_dev, /* dev */
+ return usb_control_msg(cp->usb_dev, /* dev */
0x40, /* request */
0xff, /* requesttype */
0x37e1, /* value */
}
static int
-cp_usb_uart_enable_disable(struct ccdbg *dbg, uint16_t enable)
+cp_usb_uart_enable_disable(struct cp_usb *cp, uint16_t enable)
{
- return usb_control_msg(dbg->usb_dev,
+ return usb_control_msg(cp->usb_dev,
CP2101_UART,
REQTYPE_HOST_TO_DEVICE,
enable,
300);
}
-void
-cp_usb_init(struct ccdbg *dbg)
+struct cp_usb *
+cp_usb_open(void)
{
+ struct cp_usb *cp;
usb_dev_handle *dev_handle;
struct usb_device *dev = NULL;
struct usb_bus *bus, *busses;
}
if (!dev){
perror("No CP2103 found");
- exit(1);
+ return NULL;
}
+ cp = calloc(sizeof(struct cp_usb), 1);
interface = 0;
dev_handle = usb_open(dev);
usb_detach_kernel_driver_np(dev_handle, interface);
usb_claim_interface(dev_handle, interface);
- dbg->usb_dev = dev_handle;
- ret = cp_usb_uart_enable_disable(dbg, UART_DISABLE);
- dbg->gpio = 0xf;
- ret = cp_usb_gpio_set(dbg, 0xf, dbg->gpio);
- ret = cp_usb_gpio_get(dbg, &gpio);
+ cp->usb_dev = dev_handle;
+ ret = cp_usb_uart_enable_disable(cp, UART_DISABLE);
+ cp->gpio = 0xf;
+ ret = cp_usb_gpio_set(cp, 0xf, cp->gpio);
+ ret = cp_usb_gpio_get(cp, &gpio);
+ return cp;
}
void
-cp_usb_fini(struct ccdbg *dbg)
+cp_usb_close(struct cp_usb *cp)
{
- cp_usb_uart_enable_disable(dbg, UART_DISABLE);
- usb_close(dbg->usb_dev);
+ cp_usb_uart_enable_disable(cp, UART_DISABLE);
+ usb_close(cp->usb_dev);
+ free(cp);
}
void
-cp_usb_write(struct ccdbg *dbg, uint8_t mask, uint8_t value)
+cp_usb_write(struct cp_usb *cp, uint8_t mask, uint8_t value)
{
uint8_t new_gpio;
int ret;
- new_gpio = (dbg->gpio & ~mask) | (value & mask);
- if (new_gpio != dbg->gpio) {
- ret = cp_usb_gpio_set(dbg, new_gpio ^ dbg->gpio, new_gpio);
+ new_gpio = (cp->gpio & ~mask) | (value & mask);
+ if (new_gpio != cp->gpio) {
+ ret = cp_usb_gpio_set(cp, new_gpio ^ cp->gpio, new_gpio);
if (ret < 0)
perror("gpio_set");
- dbg->gpio = new_gpio;
+ cp->gpio = new_gpio;
}
}
uint8_t
-cp_usb_read(struct ccdbg *dbg)
+cp_usb_read(struct cp_usb *cp)
{
int ret;
uint8_t gpio;
- ret = cp_usb_gpio_get(dbg, &gpio);
+ ret = cp_usb_gpio_get(cp, &gpio);
if (ret < 0)
- perror("gpio_set");
+ perror("gpio_get");
return gpio;
}