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Sansa Clip+ : Add dualboot support for sansa clip+ to mkamsboot.

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Dualboot works on the sansa clip+ by holding either the left "|<<" or home buttons.
The USB pin is still undiscovered at this point and should replace the home button when found.
By including the home button for dualboot we avoid bricking due to a single button failure.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24561 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jack Halpin 2010-02-08 06:43:47 +00:00
parent dc3f746af2
commit de3489a6c8
4 changed files with 43 additions and 17 deletions
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32
rbutil/mkamsboot/dualboot/dualboot.S
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@ -157,11 +157,35 @@ uclcopy:
cmp r1, #0 /* C3 = #0 means button pressed */
beq boot_of
#elif defined(SANSA_CLIPPLUS)
/* TODO */
mov r0, #0x500000 /* Approximately 5 seconds */
1: subs r0, r0, #1 /* just to prove we are running */
@ Assumes GPIOB_DIR is 0x00 on reset
ldr r0, =GPIOB
mov r1, #(1<<0) @ pin 0
str r1, [r0, #0x400] @ GPIOB(0) = output
str r1, [r0, #4*(1<<0)] @ write 1 to GPIOB(0)
mov r1, #500 @ small delay
1: subs r1, r1, #1
bne 1b
b boot_of /* branch to OF */
@ read pins
ldr r0, =GPIOC
ldr r1, [r0, #4*(1<<3)] @ read pin C3 "|<<"
ldr r0, =GPIOA
ldr r2, [r0, #4*(1<<1)] @ read pin A1 "Home"
orr r2, r2, r1 @ c3 || A1
@ restore GPIOB_DIR(0)
ldr r0, =GPIOB
mov r1, #0
str r1, [r0, #0x400] @ Restore GPIOB_DIR to 0x00
@ Unset GPIOB(0)
str r1, [r0, #4*(0<<0)] @ write 0 to GPIOB(0)
cmp r2, #0 @ test input from pins
bne boot_of @ branch directly to OF if either pin high
#elif defined(SANSA_C200V2)
/* check for RIGHT on C6, should changed to LEFT as soon as it
* known in which pin that is in order for consistency */