nmigen-learning/fpga/icebreaker.dg

import "/nmigen_boards.icebreaker/ICEBreakerPlatform"
import "/nmigen_dg/*"
import "/sys"
import "modules/blinker/Blinker"
import "modules/pulser/Pulser"
import "modules/segment7/Segment7x2"
import "resources/pmod"

Top = subclass Elaboratable where
    elaborate = platform ~> m where with m = Module! =>
        freq = int platform.default_clk_frequency

        @ledr = platform.request "led_r" 0
        @ledg = platform.request "led_g" 0
        @seg7 = platform.request "seven_seg"

        blinker = (Submodule.blinker$ Blinker$ freq // 3 ).out
        pulser  = (Submodule.pulser $ Pulser$  freq // 2).out
        seg7    = Submodule.seg7$ Segment7x2 decimal: False

        Comb$ @ledr :== blinker

        ff = Signal 1 reset: 1
        When pulser $ ->
            Sync$ ff :== ~ff

        Comb$ @ledg :== ff

        counter = Signal 4
        When pulser $ ->
            Sync$ counter :== counter + 1

        # TODO: learn SPI FLASH
        mem = Memory
            width: 8
            depth: 16 # ew
            init: ([0xde, 0xad, 0xbe, 0xef]*4)
        rdport = Submodule.rdport$ mem.read_port!
        Comb$ rdport.addr :== counter



        Comb$ seg7.number  :== rdport.data
        #Comb$ seg7.number  :== counter
        Comb$ @seg7        :== Cat seg7.segs seg7.select



        @leds = Cat
            platform.request "led_g" 4
            platform.request "led_g" 2
            platform.request "led_g" 3
            platform.request "led_g" 1
        @ledm  = platform.request "led_r" 1
        @btn_r = platform.request "button" 1
        @btn_m = platform.request "button" 2
        @btn_l = platform.request "button" 3

        state = Signal 4 reset: 0b1000
        Comb$ @leds :== state
        Comb$ @ledm :== (@btn_r | @btn_l)

        When (on_rising_edge @btn_l) $ ->
            Sync$ state :== state.rotate_left 1
        When (on_rising_edge @btn_r) $ ->
            Sync$ state :== state.rotate_right 1
        When (on_rising_edge @btn_m) $ ->
            Sync$ state :== ~state


on_rising_edge = signal -> result where
    prev = Signal (signal.shape!)
    Sync$ prev :== signal
    result = ~ signal.implies prev


if __name__ == "__main__" =>
    plat = ICEBreakerPlatform!
    plat.add_resources$ pmod.seven_seg   0 pmod: 0 # pmod 1a
    plat.add_resources$ pmod.dip_switch8 0 pmod: 1 # pmod 1b
    plat.add_resources$ plat.break_off_pmod
    plat.build Top! do_program: ("--flash" in sys.argv)