Add seven-segments-display program

programs/segments_test.prog

@@ -0,0 +1,89 @@
+reset:
+br always >main
+nop
+hardfault:
+reti
+nop
+memfault:
+reti
+nop
+
+.align
+number_array0:
+    .word 0x03020100
+number_array1:
+    .word 0x07060504
+number_array2:
+    .word 0x0B0A0908
+number_array3:
+    .word 0x0F0E0D0C
+
+segment_addr0: .word 0x000F00A0
+segment_addr1: .word 0x000F00A4
+// w_cnt_top:  .word 0x1FC000
+w_cnt_top:    .word 0x100 //for simulation only
+
+
+infamous_pattern0:
+    .word 0x0D0E0A0D
+infamous_pattern1:
+    .word 0x0B0E0E0F
+
+main:
+    ldr r8, >w_cnt_top
+
+number_loop:
+    // First 4
+    ldr r4, >number_array0
+    ldr r0, >segment_addr0
+    st32 r0, r4
+
+    // Second 4
+    ldr r4, >number_array1
+    ldr r0, >segment_addr1
+    st32 r0, r4
+
+    call >wait
+    nop
+
+    // First 4
+    ldr r4, >number_array2
+    ldr r0, >segment_addr0
+    st32 r0, r4
+
+    // Second 4
+    ldr r4, >number_array3
+    ldr r0, >segment_addr1
+    st32 r0, r4
+
+    call >wait
+    nop
+
+    // 0xDEADBEEF pattern:
+
+    // First 4
+    ldr r4, >infamous_pattern0
+    ldr r0, >segment_addr0
+    st32 r0, r4
+
+    // Second 4
+    ldr r4, >infamous_pattern1
+    ldr r0, >segment_addr1
+    st32 r0, r4
+
+    call >wait
+    nop
+
+    br always >number_loop
+    nop
+
+
+//subroutine to iterate until counter overflow
+wait:
+    clr r7                //inititalize inner counter
+    inc_i:
+    cmp neq r7,r8
+    br true >inc_i        //if i=cnt_top
+    addi r7,1
+    ret                    //else
+    nop