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Clip+: boot to OF if USB is connected

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To be sure that there is no mistake in this code, it is run *after*
the known to work HOME & LEFT buttons checks, unlike other Sansas

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26122 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Rafaël Carré 2010-05-17 21:57:46 +00:00
parent 60741f2b0d
commit 66f183077d
5 changed files with 86 additions and 14 deletions
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63
rbutil/mkamsboot/dualboot/dualboot.S
View file

@ -26,6 +26,7 @@
.set GPIOB, 0xC80C0000
.set GPIOC, 0xC80D0000
.set GPIOD, 0xC80E0000
.set CGU_PROC, 0xC80F0010
.set CGU_PERI, 0xC80F0014
.set I2C_BASE, 0xC8070000
.set I2C_DATA, 0x00
@ -239,6 +240,68 @@ uclcopy:
cmp r2, #0 @ test input from pins
bne boot_of @ branch directly to OF if either pin high
@ check USB connection
ldr r0, =CGU_PROC
mov r1, #0
str r1, [r0] @ fclk = 24MHz
ldr r0, =CGU_PERI
ldr r1, [r0]
/* enable i2c audio master clock */
orr r1, r1, #(1<<17)
/* pclk = fclk = 24MHz */
bic r1, r1, #0x7f
str r1, [r0]
ldr r0, =I2C_BASE
/* disable i2c interrupts */
mov r1, #0
str r1, [r0, #I2C_IMR]
/* setup prescaler */
mov r1, #I2C_PRESCALER_LOW
str r1, [r0, #I2C_CPSR0]
mov r1, #I2C_PRESCALER_HIGH
str r1, [r0, #I2C_CPSR1]
/* setup i2c slave address */
mov r1, #(AS3514_I2C_ADDR << 1)
str r1, [r0, #I2C_SLAD0]
mov r2, #0x51
str r2, [r0, #I2C_CNTRL]
/* wait for not busy */
1:
ldr r1, [r0, #I2C_SR]
tst r1, #1
bne 1b
/* wait a bit (~100ms) else detection fails */
mov r1, #0x80000
1: subs r1, r1, #1
bne 1b
/* start read of irq_enrd0 */
mov r1, #AS3514_IRQ_ENRD0
str r1, [r0, #I2C_SADDR]
orr r2, r2, #(1 << 1)
str r2, [r0, #I2C_CNTRL]
mov r1, #1
str r1, [r0, #I2C_DACNT]
/* wait for transfer to finish */
1:
ldr r1, [r0, #I2C_DACNT]
cmp r1, #0
bne 1b
/* load result and test USB_STATUS bit */
ldr r1, [r0, #I2C_DATA]
tst r1, #(1 << 3)
bne boot_of
#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 */