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Sansa ClipZip set lcd SSP properly

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Change-Id: Ice62dfa7f266ee4369793777a39e675bceae1831
This commit is contained in:
William Wilgus 2018-07-29 05:10:22 +02:00
parent ce29bec89b
commit 084aa9c1fd
1 changed files with 16 additions and 1 deletions
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17
firmware/target/arm/as3525/sansa-clipzip/lcd-clipzip.c
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@ -35,12 +35,26 @@ static int lcd_type;
static bool lcd_enabled; static bool lcd_enabled;
#endif #endif
static void ssp_set_prescaler(unsigned int prescaler)
{
int oldlevel = disable_interrupt_save(IRQ_FIQ_STATUS);
/* must be on to write regs */
bool ssp_enabled = bitset32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE) &
CGU_SSP_CLOCK_ENABLE;
SSP_CPSR = prescaler;
if (!ssp_enabled) /* put it back how we found it */
bitclr32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE);
restore_irq(oldlevel);
}
/* initialises the host lcd hardware, returns the lcd type */ /* initialises the host lcd hardware, returns the lcd type */
static int lcd_hw_init(void) static int lcd_hw_init(void)
{ {
/* configure SSP */ /* configure SSP */
bitset32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE); bitset32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE);
SSP_CPSR = 4; /* TODO: use AS3525_SSP_PRESCALER, OF uses 8 */ ssp_set_prescaler(AS3525_SSP_PRESCALER); /* OF = 0x8 */
SSP_CR0 = (0 << 8) | /* SCR, serial clock rate divider = 1 */ SSP_CR0 = (0 << 8) | /* SCR, serial clock rate divider = 1 */
(1 << 7) | /* SPH, phase = 1 */ (1 << 7) | /* SPH, phase = 1 */
(1 << 6) | /* SPO, polarity = 1 */ (1 << 6) | /* SPO, polarity = 1 */
@ -437,3 +451,4 @@ void lcd_update(void)
{ {
lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT); lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
} }