Sojus07/hackrf
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Use defines for offsets into SGPIO shadow registers.

Browse Source 
This is just to make the SGPIO code less cryptic, and to place
the explanation of the offsets closer to where they are defined.
This commit is contained in:
Martin Ling
2021-12-20 12:18:05 +00:00
parent 5b2a390728
commit dc0f8f48c5
1 changed files with 29 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
firmware/hackrf_usb/sgpio_m0.s
View File

@ -103,6 +103,19 @@ registers and fixed memory addresses.
.equ TARGET_BUFFER_TX, 0x20007004
.equ TARGET_BUFFER_MASK, 0x7fff
// Our slice chain is set up as follows (ascending data age; arrows are reversed for flow):
// L -> F -> K -> C -> J -> E -> I -> A
// Which has equivalent shadow register offsets:
// 44 -> 20 -> 40 -> 8 -> 36 -> 16 -> 32 -> 0
.equ SLICE0, 44
.equ SLICE1, 20
.equ SLICE2, 40
.equ SLICE3, 8
.equ SLICE4, 36
.equ SLICE5, 16
.equ SLICE6, 32
.equ SLICE7, 0
// Entry point. At this point, the libopencm3 startup code has set things up as
// normal; .data and .bss are initialised, the stack is set up, etc. However,
// we don't actually use any of that. All the code in this file would work
@ -151,11 +164,6 @@ main:
mov r8, r3 // Store &position_in_buffer. // 1
// Our slice chain is set up as follows (ascending data age; arrows are reversed for flow):
// L -> F -> K -> C -> J -> E -> I -> A
// Which has equivalent shadow register offsets:
// 44 -> 20 -> 40 -> 8 -> 36 -> 16 -> 32 -> 0
// Load direction (TX or RX)
ldr r0, =TARGET_BUFFER_TX // 2
ldr r0, [r0] // 2
@ -167,31 +175,31 @@ main:
direction_tx:
ldm r6!, {r0-r5} // 7
str r0, [r7, #44] // 8
str r1, [r7, #20] // 8
str r2, [r7, #40] // 8
str r3, [r7, #8 ] // 8
str r4, [r7, #36] // 8
str r5, [r7, #16] // 8
str r0, [r7, #SLICE0] // 8
str r1, [r7, #SLICE1] // 8
str r2, [r7, #SLICE2] // 8
str r3, [r7, #SLICE3] // 8
str r4, [r7, #SLICE4] // 8
str r5, [r7, #SLICE5] // 8
ldm r6!, {r0-r1} // 3
str r0, [r7, #32] // 8
str r1, [r7, #0] // 8
str r0, [r7, #SLICE6] // 8
str r1, [r7, #SLICE7] // 8
b done // 3
direction_rx:
ldr r0, [r7, #44] // 10
ldr r1, [r7, #20] // 10
ldr r2, [r7, #40] // 10
ldr r3, [r7, #8 ] // 10
ldr r4, [r7, #36] // 10
ldr r5, [r7, #16] // 10
ldr r0, [r7, #SLICE0] // 10
ldr r1, [r7, #SLICE1] // 10
ldr r2, [r7, #SLICE2] // 10
ldr r3, [r7, #SLICE3] // 10
ldr r4, [r7, #SLICE4] // 10
ldr r5, [r7, #SLICE5] // 10
stm r6!, {r0-r5} // 7
ldr r0, [r7, #32] // 10
ldr r1, [r7, #0] // 10
ldr r0, [r7, #SLICE6] // 10
ldr r1, [r7, #SLICE7] // 10
stm r6!, {r0-r1} // 3
done: