hwinit-lc4357-hdk.c File Reference

This source file contains parts of the system initialization. More...

#include <bsp/tms570.h>
#include <bsp/tms570_hwinit.h>
#include <bsp/tms570-pinmux.h>

Typedefs
typedef enum Tms570ClockDisableSources	Tms570ClockDisableSources
typedef enum Tms570GhvClockSources	Tms570GhvClockSources

Enumerations
enum	Tms570ClockDisableSources {   TMS570_CLKDIS_SRC_OSC = 0x01 , TMS570_CLKDIS_SRC_PLL1 = 0x02 , TMS570_CLKDIS_SRC_RESERVED = 0x04 , TMS570_CLKDIS_SRC_EXT_CLK1 = 0x08 ,   TMS570_CLKDIS_SRC_LOW_FREQ_LPO = 0x10 , TMS570_CLKDIS_SRC_HIGH_FREQ_LPO = 0x20 , TMS570_CLKDIS_SRC_PLL2 = 0x40 , TMS570_CLKDIS_SRC_EXT_CLK2 = 0x80 }
enum	Tms570GhvClockSources {   TMS570_SYS_CLK_SRC_OSC = 0U , TMS570_SYS_CLK_SRC_PLL1 = 1U , TMS570_SYS_CLK_SRC_EXTERNAL1 = 3U , TMS570_SYS_CLK_SRC_LPO_LOW = 4U ,   TMS570_SYS_CLK_SRC_LPO_HIGH = 5U , TMS570_SYS_CLK_SRC_PLL2 = 6U , TMS570_SYS_CLK_SRC_EXTERNAL2 = 7U , TMS570_SYS_CLK_SRC_VCLK = 9U }

Functions
void	tms570_pinmux_init (void)
	Initialize the tms570 PINMUX peripheral. This maps signals to pin terminals.
void	tms570_emif_sdram_init (void)
	Initialize the External Memory InterFace (EMIF) peripheral.
void	tms570_pll_init (void)
	Setup all system PLLs (HCG:setupPLL)
void	tms570_map_clock_init (void)
	Initialize the tms570 Global Clock Manager (GCM) registers which sub-divide the input clock source (generally PLL) into the various peripheral clocks (VCLK1-3, etc).

Detailed Description

This source file contains parts of the system initialization.

Enumeration Type Documentation

Tms570ClockDisableSources

enum Tms570ClockDisableSources

Enumerator
TMS570_CLKDIS_SRC_OSC	External high-speed oscillator as clock source.
TMS570_CLKDIS_SRC_RESERVED	reserved. not tied to actual clock source

Tms570GhvClockSources

enum Tms570GhvClockSources

Enumerator
TMS570_SYS_CLK_SRC_OSC	Alias for oscillator clock Source
TMS570_SYS_CLK_SRC_PLL1	Alias for Pll1 clock Source
TMS570_SYS_CLK_SRC_EXTERNAL1	Alias for external clock Source
TMS570_SYS_CLK_SRC_LPO_LOW	Alias for low power oscillator low clock Source
TMS570_SYS_CLK_SRC_LPO_HIGH	Alias for low power oscillator high clock Source
TMS570_SYS_CLK_SRC_PLL2	Alias for Pll2 clock Source
TMS570_SYS_CLK_SRC_EXTERNAL2	Alias for external 2 clock Source
TMS570_SYS_CLK_SRC_VCLK	Alias for synchronous VCLK1 clock Source

Function Documentation

tms570_map_clock_init()

void tms570_map_clock_init

(

void

)

Initialize the tms570 Global Clock Manager (GCM) registers which sub-divide the input clock source (generally PLL) into the various peripheral clocks (VCLK1-3, etc).

Initialize Clock Tree:

• Disable / Enable clock domain
• Setup RTICLK1 and RTICLK2 clocks
• Setup asynchronous peripheral clock sources for AVCLK1 and AVCLK2
• Setup synchronous peripheral clock dividers for VCLK1, VCLK2, VCLK3

tms570_pll_init()

void tms570_pll_init

(

void

)

Setup all system PLLs (HCG:setupPLL)

Initialize PLLs source divider/multipliers.

• Setup pll control register 1:
  • Disable reset on oscillator slip (ROS)
  • Enable bypass on pll slip TODO: desired: switches to OSC when PLL slip detected
  • setup Pll output clock divider to max before Lock
  • Disable reset on oscillator fail
  • Setup reference clock divider
  • Setup Pll multiplier
  • PLL1: 16MHz OSC in -> 300MHz PLL1 out
• Setup pll control register 2
  • Setup spreading rate
  • Setup bandwidth adjustment
  • Setup internal Pll output divider
  • Setup spreading amount
• Setup pll2 control register :
  • setup Pll output clock divider to max before Lock
  • Setup reference clock divider
  • Setup internal Pll output divider
  • Setup Pll multiplier