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2006-06-02 Jay Monkman <jtm@lopingdog.com>

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* startup/bspstart.c: Fixed PLL calculations.
This commit is contained in:
Jay Monkman
2006-06-03 03:20:15 +00:00
parent 9cdfb0e586
commit 47dbc76bfa
2 changed files with 35 additions and 12 deletions
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8
c/src/lib/libbsp/arm/csb336/ChangeLog
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@@ -1,4 +1,10 @@
2006-06-02 Jay Monkman
2006-06-02 Jay Monkman <jtm@lopingdog.com>
* Makefile.am, console/uart.c, startup/exit.c: Changed UART
driver to be interrupt driven, added support for both UARTs.
2006-06-02 Jay Monkman <jtm@lopingdog.com>
* network/network.c: Changed interrupt handling
to use shared rtems_irq_connect_data struct.

39
c/src/lib/libbsp/arm/csb336/startup/bspstart.c
View File

@@ -86,8 +86,24 @@ void bsp_pretasking_hook(void)
/* Since RTEMS is not configured, no RTEMS functions can be called. */
/* */
/**************************************************************************/
void mmu_set_cpu_async_mode(void);
void bsp_start_default( void )
{
int i;
/* Set the MCU prescaler to divide by 1 */
MC9328MXL_PLL_CSCR &= ~MC9328MXL_PLL_CSCR_PRESC;
/* Enable the MCU PLL */
MC9328MXL_PLL_CSCR |= MC9328MXL_PLL_CSCR_MPEN;
/* Delay to allow time for PLL to get going */
for (i = 0; i < 100; i++) {
asm volatile ("nop\n");
}
/* Set the CPU to asynchrous clock mode, so it uses its fastest clock */
mmu_set_cpu_async_mode();
/* disable interrupts */
MC9328MXL_AITC_INTENABLEL = 0;
@@ -153,12 +169,12 @@ void bsp_start_default( void )
/* Calcuate the frequency for perclk1 */
int get_perclk1_freq(void)
{
int fin;
int fpll;
int pd;
int mfd;
int mfi;
int mfn;
unsigned int fin;
unsigned int fpll;
unsigned int pd;
unsigned int mfd;
unsigned int mfi;
unsigned int mfn;
uint32_t reg;
int perclk1;
@@ -187,13 +203,14 @@ int get_perclk1_freq(void)
printk("mfd = %d\n", mfd);
printk("mfi = %d\n", mfi);
printk("mfn = %d\n", mfn);
printk("(fin * mfi) / (pd + 1) = %d\n", (fin * mfi) / (pd + 1));
printk("(fin * mfn) / ((pd + 1) * (mfd + 1)) = %d\n",
(fin * mfn) / ((pd + 1) * (mfd + 1)));
printk("rounded (fin * mfi) / (pd + 1) = %d\n", (fin * mfi) / (pd + 1));
printk("rounded (fin * mfn) / ((pd + 1) * (mfd + 1)) = %d\n",
((long long)fin * mfn) / ((pd + 1) * (mfd + 1)));
#endif
fpll = 2 * ( ((fin * mfi) / (pd + 1)) +
((fin * mfn) / ((pd + 1) * (mfd + 1))) );
fpll = 2 * ( ((fin * mfi + (pd + 1) / 2) / (pd + 1)) +
(((long long)fin * mfn + ((pd + 1) * (mfd + 1)) / 2) /
((pd + 1) * (mfd + 1))) );
/* calculate the output of the PERCLK1 divider */
reg = MC9328MXL_PLL_PCDR;