Sojus07/hackrf
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bring up PLL1 in stages

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This commit is contained in:
Michael Ossmann
2012-06-07 12:00:30 -06:00
parent 6ec040698c
commit d1d1434fed
1 changed files with 37 additions and 8 deletions
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45
firmware/common/hackrf_core.c
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@ -22,6 +22,7 @@
#include "hackrf_core.h"
#include "si5351c.h"
#include <libopencm3/lpc43xx/i2c.h>
#include <libopencm3/lpc43xx/cgu.h>
#ifdef JELLYBEAN
@ -37,7 +38,7 @@ void delay(uint32_t duration)
/* clock startup for Jellybean with Lemondrop attached */
void cpu_clock_init(void)
{
//FIXME I2C setup
i2c0_init();
si5351c_disable_all_outputs();
si5351c_disable_oeb_pin_control();
@ -92,22 +93,50 @@ void cpu_clock_init(void)
| (CGU_SRC_XTAL << CGU_PLL1_CTRL_CLK_SEL_SHIFT));
while (CGU_PLL1_STAT & CGU_PLL1_STAT_LOCK);
//FIXME this may need to be done in several stages
/* configure PLL1 to produce 204 MHz clock from 12 MHz XTAL_OSC */
CGU_PLL1_CTRL |= (CGU_PLL1_CTRL_PD
| CGU_PLL1_CTRL_FBSEL
| CGU_PLL1_CTRL_DIRECT
| (0 << CGU_PLL1_CTRL_PSEL_SHIFT)
/* configure PLL1 to produce 12 MHz clock from 12 MHz XTAL_OSC */
CGU_PLL1_CTRL |= (CGU_PLL1_CTRL_FBSEL
| (3 << CGU_PLL1_CTRL_PSEL_SHIFT)
| (0 << CGU_PLL1_CTRL_NSEL_SHIFT)
| (16 << CGU_PLL1_CTRL_MSEL_SHIFT));
| (0 << CGU_PLL1_CTRL_MSEL_SHIFT));
//FIXME why can't we get past this point?
/* power on PLL1 and wait until stable */
CGU_PLL1_CTRL &= ~CGU_PLL1_CTRL_PD;
while (!(CGU_PLL1_STAT & CGU_PLL1_STAT_LOCK));
/* configure PLL1 to produce 108 MHz clock from 12 MHz XTAL_OSC */
CGU_PLL1_CTRL &= ~(CGU_PLL1_CTRL_BYPASS
| CGU_PLL1_CTRL_FBSEL
| CGU_PLL1_CTRL_DIRECT
| CGU_PLL1_CTRL_DIRECT
| (0x3 << CGU_PLL1_CTRL_PSEL_SHIFT)
| (0x3 << CGU_PLL1_CTRL_NSEL_SHIFT)
| (0xFF << CGU_PLL1_CTRL_MSEL_SHIFT));
CGU_PLL1_CTRL |= (CGU_PLL1_CTRL_FBSEL
| CGU_PLL1_CTRL_DIRECT
| (0 << CGU_PLL1_CTRL_PSEL_SHIFT)
| (0 << CGU_PLL1_CTRL_NSEL_SHIFT)
| (8 << CGU_PLL1_CTRL_MSEL_SHIFT));
/* use PLL1 as clock source for BASE_M4_CLK (CPU) */
CGU_BASE_M4_CLK = (CGU_BASE_CLK_AUTOBLOCK
| (CGU_SRC_PLL1 << CGU_BASE_CLK_SEL_SHIFT));
delay(1000000);
/* configure PLL1 to produce 204 MHz clock from 12 MHz XTAL_OSC */
CGU_PLL1_CTRL &= ~(CGU_PLL1_CTRL_BYPASS
| CGU_PLL1_CTRL_FBSEL
| CGU_PLL1_CTRL_DIRECT
| CGU_PLL1_CTRL_DIRECT
| (0x3 << CGU_PLL1_CTRL_PSEL_SHIFT)
| (0x3 << CGU_PLL1_CTRL_NSEL_SHIFT)
| (0xFF << CGU_PLL1_CTRL_MSEL_SHIFT));
CGU_PLL1_CTRL |= (CGU_PLL1_CTRL_FBSEL
| CGU_PLL1_CTRL_DIRECT
| (0 << CGU_PLL1_CTRL_PSEL_SHIFT)
| (0 << CGU_PLL1_CTRL_NSEL_SHIFT)
| (16 << CGU_PLL1_CTRL_MSEL_SHIFT));
delay(1000000);
/* use XTAL_OSC as clock source for PLL0USB */
CGU_PLL0USB_CTRL = (CGU_PLL0USB_CTRL_PD