Subversion Repositories hive

/*

--------------------------------------------------------------------------------

Module : boot_code.h

--------------------------------------------------------------------------------

Function:

- Boot code for a processor core.

Instantiates:

- Nothing.

Notes:

- For testing (@ core.v):

  CLR_BASE              = 'h0;

  CLR_SPAN              = 2;  // gives 4 instructions

  INTR_BASE             = 'h20;  // 'd32

  INTR_SPAN             = 2;  // gives 4 instructions

--------------------------------------------------------------------------------

*/

        /*

        --------------------

        -- external stuff --

        --------------------

        */

        `include "boot_code_defs.h"

        /*

        ----------------------------------------

        -- initialize: fill with default data --

        ----------------------------------------

        */

        integer i;

        initial begin

/*      // fill with nop (some compilers need this)

        for ( i = 0; i < CAPACITY; i = i+1 ) begin

                ram[i] = { `nop, `__, `__ };

        end

*/

        /*

        ---------------

        -- boot code --

        ---------------

        */

        // Thread 0 : do LED PWM action

        // All other threads : loop forever

        ///////////////

        // clr space //

        ///////////////

        // thread 0

        i='h00;  ram[i] = { `lit_u,            `__, `s2 };  // s2=dat

        i=i+1;   ram[i] =                      16'h0100  ;  // addr

        i=i+1;   ram[i] = { `gto,              `P2, `__ };  // goto, pop s2 (addr)

        // and the rest

        i='h04;  ram[i] = { `jmp_ie,    -4'd1, `s0, `s0 };  // loop forever

        i='h08;  ram[i] = { `jmp_ie,    -4'd1, `s0, `s0 };  // loop forever

        i='h0c;  ram[i] = { `jmp_ie,    -4'd1, `s0, `s0 };  // loop forever

        i='h10;  ram[i] = { `jmp_ie,    -4'd1, `s0, `s0 };  // loop forever

        i='h14;  ram[i] = { `jmp_ie,    -4'd1, `s0, `s0 };  // loop forever

        i='h18;  ram[i] = { `jmp_ie,    -4'd1, `s0, `s0 };  // loop forever

        i='h1c;  ram[i] = { `jmp_ie,    -4'd1, `s0, `s0 };  // loop forever

        ////////////////

        // intr space //

        ////////////////

        ///////////////////////

        // code & data space //

        ///////////////////////

/*

        // simple binary count LED display

        i='h100; ram[i] = { `dat_is,          6'd0, `s0 };  // s0=0

        i=i+1;   ram[i] = { `dat_is,        `IO_LO, `s1 };  // s1=reg addr

        // loop start

        i=i+1;   ram[i] = { `add_is,          6'd1, `P0 };  // s0++

        i=i+1;   ram[i] = { `psu_i,         -6'd20, `s0 };  // s0=s0>>20

        i=i+1;   ram[i] = { `reg_w,            `s1, `P0 };  // (s1)=s0, pop s0

        i=i+1;   ram[i] = { `jmp_ie,    -4'd4, `s0, `s0 };  // loop forever

        // loop end

*/

/*

        // simple sequential LED display

        i='h100; ram[i] = { `dat_is,          6'd0, `s0 };  // s0=0

        i=i+1;   ram[i] = { `dat_is,        `IO_LO, `s1 };  // s1=reg addr

        // loop start

        i=i+1;   ram[i] = { `add_is,          6'd1, `P0 };  // s0++

        i=i+1;   ram[i] = { `shl_is,         6'd10, `s0 };  // s0=s0<<10

        i=i+1;   ram[i] = { `psu_i,         -6'd30, `P0 };  // s0=s0>>30, pop s0

        i=i+1;   ram[i] = { `pow,              `P0, `s0 };  // s0=1<<s0, pop s0

        i=i+1;   ram[i] = { `reg_w,            `s1, `P0 };  // (s1)=s0, pop s0

        i=i+1;   ram[i] = { `jmp_ie,    -4'd6, `s0, `s0 };  // loop forever

        // loop end

*/

/*

        // sequential LED display w/ PWM - moving "dark spot"

        i='h100; ram[i] = { `dat_is,          6'd0, `s0 };  // s0=0

        i=i+1;   ram[i] = { `dat_is,        `IO_LO, `s1 };  // s1=reg addr

        i=i+1;   ram[i] = { `dat_is,          6'd0, `s2 };  // s2=pwm

        // loop start

        i=i+1;   ram[i] = { `shl_is,         6'd13, `s0 };  // s0=s0<<13 - isolate decimal

        i=i+1;   ram[i] = { `add,              `P0, `P2 };  // s2+=s0, pop s0 - add to pwm counter

        i=i+1;   ram[i] = { `add_is,          6'd1, `P0 };  // s0++ - get next value

        i=i+1;   ram[i] = { `shl_is,         6'd13, `s0 };  // s0=s0<<13 - isolate decimal

        i=i+1;   ram[i] = { `add_xu,           `P0, `s2 };  // s2=s2+s0, pop s0 - see if it will cause pwm counter overflow

        i=i+1;   ram[i] = { `shl_is,         6'd19, `P2 };  // s2<<=19 - shift up to ones place

        i=i+1;   ram[i] = { `add,              `P2, `s0 };  // s0+=s2, pop s2 - add pwm bit

        i=i+1;   ram[i] = { `shl_is,         6'd11, `P0 };  // s0<<=11 - isolate integer

        i=i+1;   ram[i] = { `psu_i,         -6'd30, `P0 };  // s0>>=30

        i=i+1;   ram[i] = { `pow,              `s0, `P0 };  // s0=1<<s0, pop s0 - do one hot

        i=i+1;   ram[i] = { `not,              `s0, `P0 };  // s0~=s0 - invert

        i=i+1;   ram[i] = { `reg_w,            `s1, `P0 };  // (s1)=s0, pop s0

        i=i+1;   ram[i] = { `jmp_inz,       -6'd13, `s1 };  // loop forever

        // loop end

*/

        // "bouncing ball" 4 LED display w/ PWM

        //

        // s0 : sin

        // s1 : cos

        // s2 : alpha (attenuation factor = speed)

        // s3 : rectified sin, val, one-hot(val)

        // s4 : 

        // s5 : pwm counter

        // s6 : 

        // s7 : i/o register address

        i='h100; ram[i] = { `dat_is,          6'd0, `s0 };  // s0=0  (sin init)

        i=i+1;   ram[i] = { `lit_u,            `__, `s1 };  // s1=0x3000,0000 (cos init)

        i=i+1;   ram[i] =                      16'h3000  ;  //

        i=i+1;   ram[i] = { `shl_is,         6'd16, `P1 };  //

        i=i+1;   ram[i] = { `lit_u,            `__, `s2 };  // s2=0x3000 (alpha init)

        i=i+1;   ram[i] =                      16'h3000  ;  //

        i=i+1;   ram[i] = { `dat_is,          6'd0, `s5 };  // s5=0  (pwm init)

        i=i+1;   ram[i] = { `dat_is,        `IO_LO, `s7 };  // s7=reg addr

        // loop start

        // sin & cos

        i=i+1;   ram[i] = { `mul_xs,           `s2, `s0 };  // s0=s0*s2 (sin*alpha)

        i=i+1;   ram[i] = { `sub,              `P0, `P1 };  // s1-=s0 (cos-=sin*alpha)

        i=i+1;   ram[i] = { `mul_xs,           `s2, `s1 };  // s1=s1*s2 (cos*alpha)

        i=i+1;   ram[i] = { `add,              `P1, `P0 };  // s0-=s1 (sin+=cos*alpha)

        // |sin|

        i=i+1;   ram[i] = { `cpy,              `s0, `s3 };  // s3=s0

        i=i+1;   ram[i] = { `jmp_inlz,        6'd1, `s3 };  // (s3!<0) ? jmp +1

        i=i+1;   ram[i] = { `not,              `s3, `P3 };  // s3~=s3

        // decimal( |sin| ) + pwm to update, + pwm to get ofl

        i=i+1;   ram[i] = { `shl_is,          6'd4, `s3 };  // s3=s3<<4

        i=i+1;   ram[i] = { `add,              `s3, `P5 };  // s5+=s3 (update pwm count)

        i=i+1;   ram[i] = { `add_xu,           `P3, `s5 };  // s5=s5+s3, pop s3 (get pwm ofl)

        // one-hot( int( |sin| ) + pwm ofl )

        i=i+1;   ram[i] = { `shl_is,        -6'd28, `P3 };  // s3>>=28

        i=i+1;   ram[i] = { `add,              `P5, `P3 };  // s3+=s5, pop s5 (add pwm ofl)

        i=i+1;   ram[i] = { `pow,              `s3, `P3 };  // s3=1<<s3, pop s3 (one-hot)

        // output

        i=i+1;   ram[i] = { `reg_w,            `s7, `P3 };  // (s7)=s3, pop s3

        i=i+1;   ram[i] = { `jmp_inz,       -6'd15, `s7 };  // loop forever

        // loop end

        end