spinal.lib.bus.amba3.apb.Apb3Gpio.scala Maven / Gradle / Ivy
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package spinal.lib.bus.amba3.apb
import spinal.core._
import spinal.lib._
import spinal.lib.io.{TriStateArray, TriState}
object Apb3Gpio{
def getApb3Config() = Apb3Config(addressWidth = 4,dataWidth = 32)
}
/*
* gpioRead -> 0x00 Read only register to read the physical pin values
* gpioWrite -> 0x04 Read-Write register to access the output values
* gpioDirection -> 0x08 Read-Write register to set the GPIO pin directions. When set, the corresponding pin is set as output.
**/
case class Apb3Gpio(gpioWidth: Int, withReadSync : Boolean) extends Component {
val io = new Bundle {
val apb = slave(Apb3(Apb3Gpio.getApb3Config()))
val gpio = master(TriStateArray(gpioWidth bits))
val value = out Bits(gpioWidth bits)
}
io.value := (if(withReadSync) BufferCC(io.gpio.read) else io.gpio.read)
val ctrl = Apb3SlaveFactory(io.apb)
ctrl.read(io.value, 0)
ctrl.driveAndRead(io.gpio.write, 4)
ctrl.driveAndRead(io.gpio.writeEnable, 8)
io.gpio.writeEnable.getDrivingReg() init(0)
}