LPC_SysControl.c
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上传日期:2013-09-23
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文件大小:7k
- /*************************************************************************
- *
- * Used with ICCARM and AARM.
- *
- * (c) Copyright IAR Systems 2003
- *
- * File name : LPC_SysControl.c
- * Description : Define API for system init
- *
- * History :
- * 1. Data: August 17, 2004
- * Author: Shawn Zhang
- * Description: Create the basic function
- *
- * 2. Data : Oct 7, 2004
- * Author : Stanimir Bonev
- * Description : Modify some function and interface
- *
- * $Revision: 1.2 $
- **************************************************************************/
- #include "LPC_SysControl.h"
- LPC_Syscontrol_Config_t SysConfig;
- /*************************************************************************
- * Function Name: SYS_Init
- * Parameters: unsigned long Fosc
- * unsigned long Fcclk
- * LPC_SysControl_VPBDiv_t VPBDivider
- * LPC_SysControl_RemapMode_t RemapMode
- * bool MAMEnable
- * LPC_SysControl_MAMConfig_t *pMAMConfig
- * unsigned long PortDir0
- * unsigned long Port0
- * unsigned long PortDir1
- * unsigned long Port1
- *
- * Return: int
- * 0: success
- * non-zero: error number
- *
- * Description: Initialize the whole system, setting MEMMAP, VPB, whether enable PLL,
- * whether enable MAM
- *
- *************************************************************************/
- int SYS_Init (unsigned long Fosc, unsigned long Fcclk,
- LPC_SysControl_VPBDiv_t VPBDivider,
- LPC_SysControl_RemapMode_t RemapMode,
- unsigned long PortDir0, unsigned long Port0,
- unsigned long PortDir1, unsigned long Port1)
- {
- unsigned long M, P_min, P_max, P, i;
- int Pflag = 0, PLLflag = 0;
-
- // Check vaild
- if ( Fosc<Fosc_MIN || Fosc>Fosc_MAX)
- return 1;
- if ( Fcclk<Fcclk_MIN || Fcclk>Fcclk_MAX)
- return 1;
- if (Fcclk < Fosc)
- return 1;
- else if (Fcclk > Fosc)
- {
- // Calculate PLL's value M & P if need
- M = Fcclk / Fosc;
- P_min = Fcco_MIN / (2*Fcclk) + 1;
- P_max = Fcco_MAX / (2*Fcclk);
- for (i=P_min; i<=P_max; i++)
- {
- if ((i ==1) || (i==2) ||(i==4) || (i==8))
- {
- P=i;
- Pflag = 1;
- break;
- }
- }
- if (!Pflag) return 1;
- PLLflag = 1;
- }
- // Set globe variable
- SysConfig.Fosc = Fosc;
- SysConfig.Fcclk = Fcclk;
- switch(VPBDivider)
- {
- case VPBDIV4:
- SysConfig.Fpclk= Fcclk / 4;
- break;
- case VPBDIV1:
- SysConfig.Fpclk= Fcclk;
- break;
- case VPBDIV2:
- SysConfig.Fpclk= Fcclk / 2;
- break;
- default:
- return 1;
- }
- SysConfig.VPBDivider = VPBDivider;
- SysConfig.RemapMode = RemapMode;
- // Do PLL
- if (PLLflag)
- {
- PLLCFG_bit.MSEL = M-1; // Set M & P
- switch(P)
- {
- case 1:
- break;
- case 2:
- PLLCFG_bit.PSEL = 0x1;
- break;
- case 4:
- PLLCFG_bit.PSEL = 0x2;
- break;
- case 8:
- PLLCFG_bit.PSEL = 0x3;
- break;
- default:
- return 1;
- }
- PLLCON_bit.PLLE = true; // Enable PLL
- // Interrups must be disble
- PLLFEED = PLLFEED_DATA1;
- PLLFEED = PLLFEED_DATA2;
- while (!PLLSTAT_bit.PLOCK); // Wait PLL lock
- PLLCON_bit.PLLC = true; // Connect PLL
- PLLFEED = PLLFEED_DATA1;
- PLLFEED = PLLFEED_DATA2;
- }
- else
- {
- PLLCON_bit.PLLC = true;
- PLLCON_bit.PLLE = false;
- PLLFEED = PLLFEED_DATA1;
- PLLFEED = PLLFEED_DATA2;
- }
- // Do VPB
- VPBDIV_bit.VPBDIV = VPBDivider;
- // Do MEMAMP
- MEMMAP_bit.MAP = SysConfig.RemapMode;
- // Set GIO
- PINSEL0 = PINSEL1 = 0;
- IO0SET = Port0;
- IO0CLR = ~Port0;
- IO0DIR = PortDir0;
- IO1SET = Port1;
- IO1CLR = ~Port1;
- IO1DIR = PortDir1;
- return 0;
- }
- /*************************************************************************
- * Function Name: SYS_GetFpclk
- * Parameters: void
- * Return: int
- * 0: success
- * non-zero: error number
- * Description: Get Fpclk
- *
- *************************************************************************/
- unsigned int SYS_GetFpclk (void)
- {
- return SysConfig.Fpclk;
- }
- /*************************************************************************
- * Function Name: PM_SetMode
- * Parameters: LPC_SysControl_PMMode_t Mode -- PM_STANDARD ,PM_IDLE or PM_POWERDOWN
- * Return: int
- * 0: success
- * non-zero: error number
- * Description: Set power manage mode
- *
- *************************************************************************/
- int PM_SetMode (LPC_SysControl_PMMode_t Mode)
- {
- PCON = Mode & 0x3;
- return 0;
- }
- /*************************************************************************
- * Function Name: PM_OpenPeripheral
- * Parameters: lpc_uint32 DevType
- * Return: int
- * 0: success
- * non-zero: error number
- * Description: Open specifical peripheral
- *
- *************************************************************************/
- int PM_OpenPeripheral (unsigned int DevType)
- {
- PCONP |= DevType;
- return 0;
- }
- /*************************************************************************
- * Function Name: PM_ClosePeripheral
- * Parameters: lpc_uint32 DevType
- * Return: int
- * 0: success
- * non-zero: error number
- * Description: Close specifical peripheral
- *
- *************************************************************************/
- int PM_ClosePeripheral (unsigned int DevType)
- {
- PCONP &= (~DevType);
- return 0;
- }
- /*************************************************************************
- * Function Name: EXTINT_Init
- * Parameters: LPC_SysControl_ExtInt_Chanel_t ExtIntNum
- * bool WakeupEnable
- *
- * Return: int
- * 0 : success
- * non-zero : error number
- * Description: Set External Interrupt
- *
- *************************************************************************/
- int EXTINT_Init (LPC_SysControl_ExtInt_Chanel_t ExtIntNum,
- bool WakeupEnable)
- {
- switch(ExtIntNum)
- {
- case EXTINT0:
- // Assign pin to Ext Interrup logic
- PINSEL1_bit.P0_16 = 1;
- // Clear interrupt flag
- EXTINT_bit.EINT0 = 1;
- // Set Wakeup
- if (WakeupEnable)
- EXTWAKE_bit.EXTWAKE0 = 1;
- else
- EXTWAKE_bit.EXTWAKE0 = 0;
- break;
- case EXTINT1:
- // Assign pin to Ext Interrup logic
- PINSEL0_bit.P0_14 = 1;
- // Clear interrupt flag
- EXTINT_bit.EINT1 = 1;
- // Set Wakeup
- if (WakeupEnable)
- EXTWAKE_bit.EXTWAKE1 = 1;
- else
- EXTWAKE_bit.EXTWAKE1 = 0;
- break;
- case EXTINT2:
- // Assign pin to Ext Interrup logic
- PINSEL0_bit.P0_15 = 1;
- // Clear interrupt flag
- EXTINT_bit.EINT2 = 1;
- // Set Wakeup
- if (WakeupEnable)
- EXTWAKE_bit.EXTWAKE2 = 1;
- else
- EXTWAKE_bit.EXTWAKE2 = 0;
- break;
- default:
- return 1;
- }
- return 0;
- }