47 lines
2.0 KiB
C
47 lines
2.0 KiB
C
/* $NetBSD: pcf8584reg.h,v 1.1 2007/04/14 19:33:30 tnn Exp $ */
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/* Written by Tobias Nygren. Released into the public domain. */
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/* SCL clock frequency */
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#define PCF8584_SCL_90 0 /* 90 kHz */
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#define PCF8584_SCL_45 1 /* 45 kHz */
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#define PCF8584_SCL_11 2 /* 11 kHz */
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#define PCF8584_SCL_1_5 3 /* 1.5 kHz */
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/* Internal clock frequency */
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#define PCF8584_CLK_3 0 /* 3 MHz */
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#define PCF8584_CLK_4_43 0x10 /* 4.43 MHz */
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#define PCF8584_CLK_6 0x14 /* 6 MHz */
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#define PCF8584_CLK_8 0x18 /* 8 MHz */
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#define PCF8584_CLK_12 0x1C /* 12 MHz */
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/* Control register bits (write only) */
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#define PCF8584_CTRL_ACK (1<<0) /* send ACK */
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#define PCF8584_CTRL_STO (1<<1) /* send STOP */
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#define PCF8584_CTRL_STA (1<<2) /* send START */
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#define PCF8584_CTRL_ENI (1<<3) /* Enable Interrupt */
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#define PCF8584_CTRL_ES2 (1<<4) /* alternate register selection */
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#define PCF8584_CTRL_ES1 (1<<5) /* alternate register selection */
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#define PCF8584_CTRL_ESO (1<<6) /* Enable Serial Output */
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#define PCF8584_CTRL_PIN (1<<7) /* Pending Interrupt Not */
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/* Status register bits (read only) */
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#define PCF8584_STATUS_BBN (1<<0) /* Bus Busy Not */
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#define PCF8584_STATUS_LAB (1<<1) /* Lost Arbitration */
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#define PCF8584_STATUS_AAS (1<<2) /* Adressed As Slave */
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#define PCF8584_STATUS_LRB (1<<3) /* Last Received Bit (NAK+bcast det.) */
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#define PCF8584_STATUS_BER (1<<4) /* Bus error */
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#define PCF8584_STATUS_STS (1<<5) /* external STOP condition detected */
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#define PCF8584_STATUS_INI (1<<6) /* 0 if initialized */
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#define PCF8584_STATUS_PIN (1<<7) /* Pending Interrupt Not */
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#define PCF8584_REG_S0_ 0 /* S0' own address */
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#define PCF8584_REG_S2 PCF8584_CTRL_ES1 /* clock register */
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#define PCF8584_REG_S3 PCF8584_CTRL_ES2 /* Interrupt vector */
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#define PCF8584_CMD_START (PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \
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PCF8584_CTRL_STA | PCF8584_CTRL_ACK)
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#define PCF8584_CMD_STOP (PCF8584_CTRL_PIN | PCF8584_CTRL_ESO | \
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PCF8584_CTRL_STO | PCF8584_CTRL_ACK)
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#define PCF8584_CMD_NAK (PCF8584_CTRL_ESO)
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