mirror of
https://github.com/RIOT-OS/RIOT.git
synced 2024-12-29 04:50:03 +01:00
0cc699c0ce
Fix some lint warnings of kind ``` style (variableScope): The scope of the variable '…' can be reduced ```
88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2013, Freie Universitaet Berlin (FUB). All rights reserved.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU Lesser
|
|
* General Public License v2.1. See the file LICENSE in the top level
|
|
* directory for more details.
|
|
*/
|
|
|
|
/**
|
|
* @ingroup lpc2387
|
|
* @{
|
|
*/
|
|
|
|
#include "cpu.h"
|
|
#include <stdint.h>
|
|
#include "VIC.h"
|
|
|
|
void lpc2387_pclk_scale(uint32_t source, uint32_t target, uint32_t *pclksel, uint32_t *prescale)
|
|
{
|
|
uint32_t pclkdiv;
|
|
*prescale = source / target;
|
|
|
|
if ((*prescale % 16) == 0) {
|
|
*pclksel = 3;
|
|
pclkdiv = 8;
|
|
}
|
|
else if ((*prescale % 8) == 0) {
|
|
*pclksel = 0;
|
|
pclkdiv = 4;
|
|
}
|
|
else if ((*prescale % 4) == 0) {
|
|
*pclksel = 2;
|
|
pclkdiv = 2;
|
|
}
|
|
else {
|
|
*pclksel = 1;
|
|
pclkdiv = 1;
|
|
}
|
|
|
|
*prescale /= pclkdiv;
|
|
|
|
if (*prescale % 2) {
|
|
(*prescale)++;
|
|
}
|
|
}
|
|
|
|
void cpu_clock_scale(uint32_t source, uint32_t target, uint32_t *prescale)
|
|
{
|
|
uint32_t pclksel;
|
|
|
|
lpc2387_pclk_scale(source, target, &pclksel, prescale);
|
|
|
|
PCLKSEL0 = (PCLKSEL0 & ~(BIT2 | BIT3)) | (pclksel << 2); // timer 0
|
|
PCLKSEL0 = (PCLKSEL0 & ~(BIT4 | BIT5)) | (pclksel << 4); // timer 1
|
|
PCLKSEL1 = (PCLKSEL1 & ~(BIT12 | BIT13)) | (pclksel << 12); // timer 2
|
|
}
|
|
|
|
/******************************************************************************
|
|
** Function name: install_irq
|
|
**
|
|
** Descriptions: Install interrupt handler
|
|
** parameters: Interrupt number, interrupt handler address,
|
|
** interrupt priority
|
|
** Returned value: true or false, return false if IntNum is out of range
|
|
**
|
|
******************************************************************************/
|
|
#define VIC_BASE_ADDR 0xFFFFF000
|
|
|
|
bool install_irq(int IntNumber, void (*HandlerAddr)(void), int Priority)
|
|
{
|
|
VICIntEnClr = 1 << IntNumber; /* Disable Interrupt */
|
|
|
|
if (IntNumber >= VIC_SIZE) {
|
|
return (false);
|
|
}
|
|
else {
|
|
/* find first un-assigned VIC address for the handler */
|
|
int *vect_addr = (int *)(VIC_BASE_ADDR + VECT_ADDR_INDEX + IntNumber * 4);
|
|
int *vect_cntl = (int *)(VIC_BASE_ADDR + VECT_CNTL_INDEX + IntNumber * 4);
|
|
*vect_addr = (int)HandlerAddr; /* set interrupt vector */
|
|
*vect_cntl = Priority;
|
|
VICIntEnable = 1 << IntNumber; /* Enable Interrupt */
|
|
return(true);
|
|
}
|
|
}
|
|
|
|
/** @} */
|