Mercurial > public > hwos_code

comparison src/i2c.asm @ 158:683321c09cfa

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
nicer boot into surfacemode
author heinrichsweikamp
date Thu, 04 Sep 2014 17:40:24 +0200
parents f3062a611eef
children 30ebaf72170d
comparison
equal deleted inserted replaced
157:5ee76921e359 158:683321c09cfa
122 I2C_RX_accelerometer: 122 I2C_RX_accelerometer:
123 bsf SSP1CON2,SEN ; Start condition 123 bsf SSP1CON2,SEN ; Start condition
124 rcall WaitMSSP 124 rcall WaitMSSP
125 movlw 0x38 ; address 125 movlw 0x38 ; address
126 rcall I2C_TX 126 rcall I2C_TX
127 movlw 0x01 127 movlw 0x00
128 rcall I2C_TX 128 rcall I2C_TX
129 bsf SSP1CON2,RSEN ; Repeated start condition (!) 129 bsf SSP1CON2,RSEN ; Repeated start condition (!)
130 rcall WaitMSSP 130 rcall WaitMSSP
131 movlw 0x39 ; address 131 movlw 0x39 ; address
132 rcall I2C_TX 132 rcall I2C_TX
133
134 rcall I2C_OneByteRX ; Get Status Byte
135 movf SSP1BUF,W
133 136
134 ; Chip orientation on the PCB requires 137 ; Chip orientation on the PCB requires
135 ; Original = Corrected 138 ; Original = Corrected
136 ; x = -x 139 ; x = -x
137 ; y = -y 140 ; y = -y
138 ; z = -z 141 ; z = -z
139
140 142
141 rcall I2C_TwoBytesRX_div16 ; Get two bytes and devide /16 (signed) 143 rcall I2C_TwoBytesRX_div16 ; Get two bytes and devide /16 (signed)
142 comf hi ; 16bit sign change. 144 comf hi ; 16bit sign change.
143 negf lo 145 negf lo
144 btfsc STATUS,C ; Carry to propagate ? 146 btfsc STATUS,C ; Carry to propagate ?