181 lines
4.0 KiB
NASM
181 lines
4.0 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2023 by Martin Preuss
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; email : martin@libchipcard.de
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;
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; ***************************************************************************
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; * This file is part of the project "AqHome". *
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; * Please see toplevel file COPYING of that project for license details. *
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; ***************************************************************************
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; ***************************************************************************
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; defines
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; ***************************************************************************
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; data
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.dseg
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bmp280DataBegin:
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bmp280Id: .byte 1
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bmp280DataEnd:
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; ***************************************************************************
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; code
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.cseg
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; ---------------------------------------------------------------------------
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; BMP280_Init
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;
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; IN:
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; - nothing
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; OUT:
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; - CFLAG: set if okay, clear on error
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; USED:
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BMP280_Init:
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ldi xh, HIGH(bmp280DataBegin)
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ldi xl, LOW(bmp280DataBegin)
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clr r16
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ldi r17, (bmp280DataEnd-bmp280DataBegin)
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rcall Utils_FillSram
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rcall bmp280ReadId
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brcc BMP280_Init_error
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sts bmp280Id, r16 ; store id
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sec
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ret
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BMP280_Init_error:
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clc
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ret
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; ---------------------------------------------------------------------------
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; BMP280_Fini
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;
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; IN:
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; - nothing
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; OUT:
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; - CFLAG: set if okay, clear on error
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; USED:
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BMP280_Fini:
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sec
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ret
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; ---------------------------------------------------------------------------
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; bmp280ReadId
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;
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; IN:
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; - nothing
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; OUT:
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; - CFLAG: set if okay, clear on error
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; - R16 : id (most probably 0x60)
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; USED: R15, R16 (R17, R18, R22)
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bmp280ReadId:
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ldi r16, 0xd0
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rjmp bmp280ReadSingleReg
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; ---------------------------------------------------------------------------
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; bmp280ReadSingleReg
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;
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; IN:
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; - R16: register id
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; OUT:
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; - CFLAG: set if okay, clear on error
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; - R16 : register content
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; USED: R1, R15, R16 (R17, R18, R22)
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bmp280ReadSingleReg:
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in r15, SREG
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cli
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mov r1, r16
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rcall twiStart ; (R22)
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ldi r16, (BMP280_ADDR*2) ; start in write mode
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rcall twiSendByteExpectAck ; (R16, R17, R18, R22)
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brcc bmp280ReadSingleReg_error
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mov r16, r1 ; register num
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rcall twiSendByteExpectAck ; (R16, R17, R18, R22)
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brcc bmp280ReadSingleReg_error
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rcall twiRestart ; (R22)
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ldi r16, (BMP280_ADDR*2)+1 ; restart in read mode
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rcall twiSendByteExpectAck ; (R16, R17, R18, R22)
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brcc bmp280ReadSingleReg_error
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rcall twiReceiveByteSendAck ; read ID
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brcc bmp280ReadSingleReg_error
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rcall twiStop ; (R22)
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out SREG, r15
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sec
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ret
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bmp280ReadSingleReg_error:
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rcall twiStop ; (R22)
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out SREG, r15
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clc
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ret
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; ---------------------------------------------------------------------------
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; bmp280ReadRegsToSram
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;
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; IN:
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; - X: pointer to buffer to read data in
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; - R18: first register to read from
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; - R19: number of registers to read
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; OUT:
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; - CFLAG: set if okay, clear on error
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; - R16 : id (most probably 0x60)
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; USED: R15, R16 (R17, R18, R22)
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bmp280ReadRegsToSram:
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in r15, SREG
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cli
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mov r1, r18
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mov r2, r19
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rcall twiStart ; (R22)
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ldi r16, (BMP280_ADDR*2) ; start in write mode
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rcall twiSendByteExpectAck ; (R16, R17, R18, R22)
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brcc bmp280ReadRegsToSram_error
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mov r16, r1 ; first register to read
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rcall twiSendByteExpectAck ; (R16, R17, R18, R22)
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brcc bmp280ReadRegsToSram_error
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rcall twiRestart ; (R22)
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ldi r16, (BMP280_ADDR*2)+1 ; restart in read mode
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rcall twiSendByteExpectAck ; (R16, R17, R18, R22)
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brcc bmp280ReadRegsToSram_error
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bmp280ReadRegsToSram_loop:
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rcall twiReceiveByteSendAck ; read register content
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brcc bmp280ReadRegsToSram
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st x+, r16 ; store register content
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dec r2
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brne bmp280ReadRegsToSram_loop
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rcall twiStop ; (R22)
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out SREG, r15
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sec
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ret
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bmp280ReadRegsToSram_error:
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rcall twiStop ; (R22)
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out SREG, r15
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clc
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ret
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