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 <usb.h>
  13 #include <getopt.h>
  14 #include <stdint.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 //GPIO_READ
  40 //ret = cp210x_ctlmsg(port, 0xff, 0xc0, 0x00c2, 0, gpio, 1);
  41 //type c0
  42 //value c2
  43 //index 0
  44 //buffer 1 bytes
  45 //length 1
  46
  47
  48 /* Get current GPIO register from PL2303 */
  49 char gpio_read_reg(usb_dev_handle *h)
  50 {
  51         char buf;
  52         int bytes = usb_control_msg(
  53                 h,             // handle obtained with usb_open()
  54                 0xc0, // bRequestType
  55                 0xff,      // bRequest
  56                 0xc2,              // wValue
  57                 0,              // wIndex
  58                 &buf,             // pointer to destination buffer
  59                 1,  // wLength
  60                 100
  61                 );
  62         handle_error(bytes);
  63         return buf;
  64 }
  65
  66 // GPIO_WRITE
  67 //request 0xff
  68 //type 0x40
  69 //value 0x37e1
  70 //index gpioreg
  71 //data NULL
  72 //len 0
  73 void gpio_write_reg(usb_dev_handle *h, uint16_t reg)
  74 {
  75         int bytes = usb_control_msg(
  76                 h,             // handle obtained with usb_open()
  77                 0x40, // bRequestType
  78                 0xff,      // bRequest
  79                 0x37e1,              // wValue
  80                 reg,              // wIndex
  81                 0,             // pointer to destination buffer
  82                 0,  // wLength
  83                 6000
  84                 );
  85         handle_error(bytes);
  86 }
  87
  88
  89 void gpio_out(usb_dev_handle *h, int gnum, int value)
  90 {
  91
  92         uint16_t gpio = 0;
  93         switch (gnum) {
  94         case 0:
  95                 gpio |= GPIO_0;
  96                 if (value)
  97                         gpio |= (GPIO_0 << 8);
  98                 break;
  99         case 1:
 100                 gpio |= GPIO_1;
 101                 if (value)
 102                         gpio |= (GPIO_1 << 8);
 103                 break;
 104         case 2:
 105                 gpio |= GPIO_2;
 106                 if (value)
 107                         gpio |= (GPIO_2 << 8);
 108                 break;
 109         case 3:
 110                 gpio |= GPIO_3;
 111                 if (value)
 112                         gpio |= (GPIO_3 << 8);
 113                 break;
 114         }
 115         gpio_write_reg(h, gpio);
 116 }
 117
 118 void gpio_in(usb_dev_handle *h, int gpio, int pullup)
 119 {
 120         printf("FixMe: don't know how to make pins input on cp2103\n");
 121 }
 122
 123 int gpio_read(usb_dev_handle *h, int gpio)
 124 {
 125         printf("FixMe: don't know how to read pins on cp2103\n");
 126 }
 127
 128
 129 extern usb_dev_handle *nc_usb_open(int vendor, int product,
 130                                    const char *vendor_name, const char *product_name, const char *serial);
 131 void check_handle(usb_dev_handle **h, const char* manuf, const char* product, const char* serial)
 132 {
 133         if (*h)
 134                 return;
 135
 136         *h = nc_usb_open(I_VENDOR_NUM, I_PRODUCT_NUM, manuf, product, serial);
 137         if (!(*h)) {
 138                 fprintf(stderr, "No CP2103 USB device %04x:%04x found ;(\n", I_VENDOR_NUM, I_PRODUCT_NUM);
 139                 exit(1);
 140         }
 141 }