URL https://opencores.org/ocsvn/rf6809/rf6809/trunk

Subversion Repositories rf6809

[/] [rf6809/] [trunk/] [software/] [boot/] [i2c.asm] - Diff between revs 13 and 15

Rev 13	Rev 15
Line 55...	Line 55...
`; Parameters:`	`; Parameters:`
`; x = I2C controller address`	`; x = I2C controller address`
`; Returns: none`	`; Returns: none`
`; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -`	`; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -`

`_i2c_init:`	`i2c_init:`
`pshs b`	`pshs b`
`ldb #4 ; setup prescale for 400kHz clock`	`ldb #4 ; setup prescale for 400kHz clock`
`stb I2C_PREL,x`	`stb I2C_PREL,x`
`clr I2C_PREH,x`	`clr I2C_PREH,x`
`puls b,pc`	`puls b,pc`
Line 101...	Line 101...
`; accb - data to send`	`; accb - data to send`
`; Returns: none`	`; Returns: none`
`; Stack space: 2 words`	`; Stack space: 2 words`
`; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -`	`; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -`

`_i2c_xmit1:`	`i2c_xmit1:`
`pshs d ; save data value`	`pshs d ; save data value`
`pshs d ; and save it again`	`pshs d ; and save it again`
`ldb #1`	`ldb #1`
`stb I2C_CTRL,x ; enable the core`	`stb I2C_CTRL,x ; enable the core`
`ldb #$76 ; set slave address = %0111011`	`ldb #$76 ; set slave address = %0111011`