sys/dev/ic/pcf8584reg.h

   1 /*      $NetBSD: pcf8584reg.h $ */
   2
   3 /* Written by Tobias Nygren. Released into the public domain. */
   4
   5 /* SCL clock frequency */
   6 #define PCF8584_SCL_90          0       /* 90 kHz */
   7 #define PCF8584_SCL_45          1       /* 45 kHz */
   8 #define PCF8584_SCL_11          2       /* 11 kHz */
   9 #define PCF8584_SCL_1_5         3       /* 1.5 kHz */
  10
  11 /* Internal clock frequency */
  12 #define PCF8584_CLK_3           0       /* 3 MHz */
  13 #define PCF8584_CLK_4_43        0x10    /* 4.43 MHz */
  14 #define PCF8584_CLK_6           0x14    /* 6 MHz */
  15 #define PCF8584_CLK_8           0x18    /* 8 MHz */
  16 #define PCF8584_CLK_12          0x1C    /* 12 MHz */
  17
  18 /* Control register bits (write only) */
  19 #define PCF8584_CTRL_ACK        (1<<0)  /* send ACK */
  20 #define PCF8584_CTRL_STO        (1<<1)  /* send STOP */
  21 #define PCF8584_CTRL_STA        (1<<2)  /* send START */
  22 #define PCF8584_CTRL_ENI        (1<<3)  /* Enable Interrupt */
  23 #define PCF8584_CTRL_ES2        (1<<4)  /* alternate register selection */
  24 #define PCF8584_CTRL_ES1        (1<<5)  /* alternate register selection */
  25 #define PCF8584_CTRL_ESO        (1<<6)  /* Enable Serial Output */
  26 #define PCF8584_CTRL_PIN        (1<<7)  /* Pending Interrupt Not */
  27
  28 /* Status register bits (read only) */
  29 #define PCF8584_STATUS_BBN      (1<<0)  /* Bus Busy Not */
  30 #define PCF8584_STATUS_LAB      (1<<1)  /* Lost Arbitration */
  31 #define PCF8584_STATUS_AAS      (1<<2)  /* Adressed As Slave */
  32 #define PCF8584_STATUS_LRB      (1<<3)  /* Last Received Bit (NAK+bcast det.) */
  33 #define PCF8584_STATUS_BER      (1<<4)  /* Bus error */
  34 #define PCF8584_STATUS_STS      (1<<5)  /* external STOP condition detected */
  35 #define PCF8584_STATUS_INI      (1<<6)  /* 0 if initialized */
  36 #define PCF8584_STATUS_PIN      (1<<7)  /* Pending Interrupt Not */
  37
  38 #define PCF8584_REG_S0_         0                       /* S0' own address */
  39 #define PCF8584_REG_S2          PCF8584_CTRL_ES1        /* clock register */
  40 #define PCF8584_REG_S3          PCF8584_CTRL_ES2        /* Interrupt vector */
  41
  42 #define PCF8584_CMD_START (PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \
  43     PCF8584_CTRL_STA | PCF8584_CTRL_ACK)
  44 #define PCF8584_CMD_STOP (PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \
  45     PCF8584_CTRL_STO | PCF8584_CTRL_ACK)
  46 #define PCF8584_CMD_NAK (PCF8584_CTRL_ESO)