58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
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#ifndef _ACI_H_
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#define _ACI_H_
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extern int aci_port;
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extern int aci_version; /* ACI firmware version */
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extern int aci_rw_cmd(int write1, int write2, int write3);
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#define aci_indexed_cmd(a, b) aci_rw_cmd(a, b, -1)
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#define aci_write_cmd(a, b) aci_rw_cmd(a, b, -1)
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#define aci_read_cmd(a) aci_rw_cmd(a,-1, -1)
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#define COMMAND_REGISTER (aci_port) /* write register */
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#define STATUS_REGISTER (aci_port + 1) /* read register */
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#define BUSY_REGISTER (aci_port + 2) /* also used for rds */
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#define RDS_REGISTER BUSY_REGISTER
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#define ACI_SET_MUTE 0x0d
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#define ACI_SET_POWERAMP 0x0f
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#define ACI_SET_TUNERMUTE 0xa3
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#define ACI_SET_TUNERMONO 0xa4
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#define ACI_SET_IDE 0xd0
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#define ACI_SET_WSS 0xd1
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#define ACI_SET_SOLOMODE 0xd2
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#define ACI_WRITE_IGAIN 0x03
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#define ACI_WRITE_TUNE 0xa7
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#define ACI_READ_TUNERSTEREO 0xa8
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#define ACI_READ_TUNERSTATION 0xa9
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#define ACI_READ_VERSION 0xf1
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#define ACI_READ_IDCODE 0xf2
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#define ACI_INIT 0xff
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#define ACI_STATUS 0xf0
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#define ACI_S_GENERAL 0x00
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#define ACI_S_READ_IGAIN 0x21
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#define ACI_ERROR_OP 0xdf
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/*
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* The following macro SCALE can be used to scale one integer volume
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* value into another one using only integer arithmetic. If the input
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* value x is in the range 0 <= x <= xmax, then the result will be in
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* the range 0 <= SCALE(xmax,ymax,x) <= ymax.
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*
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* This macro has for all xmax, ymax > 0 and all 0 <= x <= xmax the
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* following nice properties:
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*
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* - SCALE(xmax,ymax,xmax) = ymax
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* - SCALE(xmax,ymax,0) = 0
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* - SCALE(xmax,ymax,SCALE(ymax,xmax,SCALE(xmax,ymax,x))) = SCALE(xmax,ymax,x)
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*
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* In addition, the rounding error is minimal and nicely distributed.
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* The proofs are left as an exercise to the reader.
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*/
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#define SCALE(xmax,ymax,x) (((x)*(ymax)+(xmax)/2)/(xmax))
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#endif /* _ACI_H_ */
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