cp2103.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 /* According to POSIX.1-2001 */
   4 #include <sys/select.h>
   5 #include <string.h>
   6 #include <sys/time.h>
   7 #include <sys/types.h>
   8 #include <unistd.h>
   9 #include <termios.h>
  10 #include <fcntl.h>
  11 #include <signal.h>
  12 #include <getopt.h>
  13 #include <stdint.h>
  14 #include <libusb.h>
  15
  16 #define _GNU_SOURCE
  17 #include <getopt.h>
  18
  19
  20 #define I_VENDOR_NUM        0x10c4
  21 #define I_PRODUCT_NUM       0xea60
  22
  23
  24 #define VENDOR_READ_REQUEST_TYPE        0xc0
  25 #define VENDOR_READ_REQUEST             0x01
  26
  27 #define VENDOR_WRITE_REQUEST_TYPE       0x40
  28 #define VENDOR_WRITE_REQUEST            0x01
  29
  30 /* CP2103 GPIO */
  31 #define GPIO_0  0x01
  32 #define GPIO_1  0x02
  33 #define GPIO_2  0x04
  34 #define GPIO_3  0x08
  35 #define GPIO_MASK       (GPIO_0|GPIO_1|GPIO_2|GPIO_3)
  36
  37
  38
  39
  40 int get_device_vid()
  41 {
  42         return I_VENDOR_NUM;
  43 }
  44
  45 int get_device_pid()
  46 {
  47         return I_PRODUCT_NUM;
  48 }
  49
  50 //GPIO_READ
  51 //ret = cp210x_ctlmsg(port, 0xff, 0xc0, 0x00c2, 0, gpio, 1);
  52 //type c0
  53 //value c2
  54 //index 0
  55 //buffer 1 bytes
  56 //length 1
  57
  58
  59 /* Get current GPIO register from PL2303 */
  60 char gpio_read_reg(libusb_device_handle *h)
  61 {
  62         char buf;
  63         int bytes = libusb_control_transfer(
  64                 h,             // handle obtained with usb_open()
  65                 0xc0, // bRequestType
  66                 0xff,      // bRequest
  67                 0xc2,              // wValue
  68                 0,              // wIndex
  69                 &buf,             // pointer to destination buffer
  70                 1,  // wLength
  71                 100
  72                 );
  73         handle_error(bytes);
  74         return buf;
  75 }
  76
  77 // GPIO_WRITE
  78 //request 0xff
  79 //type 0x40
  80 //value 0x37e1
  81 //index gpioreg
  82 //data NULL
  83 //len 0
  84 void gpio_write_reg(libusb_device_handle *h, uint16_t reg)
  85 {
  86         int bytes = libusb_control_transfer(
  87                 h,             // handle obtained with usb_open()
  88                 0x40, // bRequestType
  89                 0xff,      // bRequest
  90                 0x37e1,              // wValue
  91                 reg,              // wIndex
  92                 0,             // pointer to destination buffer
  93                 0,  // wLength
  94                 1000
  95                 );
  96         handle_error(bytes);
  97 }
  98
  99
 100 void gpio_out(libusb_device_handle *h, int gnum, int value)
 101 {
 102
 103         uint16_t gpio = 0;
 104         switch (gnum) {
 105         case 0:
 106                 gpio |= GPIO_0;
 107                 if (value)
 108                         gpio |= (GPIO_0 << 8);
 109                 break;
 110         case 1:
 111                 gpio |= GPIO_1;
 112                 if (value)
 113                         gpio |= (GPIO_1 << 8);
 114                 break;
 115         case 2:
 116                 gpio |= GPIO_2;
 117                 if (value)
 118                         gpio |= (GPIO_2 << 8);
 119                 break;
 120         case 3:
 121                 gpio |= GPIO_3;
 122                 if (value)
 123                         gpio |= (GPIO_3 << 8);
 124                 break;
 125         }
 126         gpio_write_reg(h, gpio);
 127 }
 128
 129 void gpio_in(libusb_device_handle *h, int gpio, int pullup)
 130 {
 131         printf("FixMe: don't know how to make pins input on cp2103\n");
 132 }
 133
 134 int gpio_read(libusb_device_handle *h, int gpio)
 135 {
 136         printf("FixMe: don't know how to read pins on cp2103\n");
 137 }
 138