本人刚接触嵌入式开发，对一些基础知识还不是很了解，最近在学习S32K开发板，在按键中断上碰到了点问题想问问各位。
程序为按键中断触发小灯亮灭，其中PTB4端口连接LED小灯，PTD15端口连接按键。程序是参照S32DS的定时器中断程序写的。
现在遇到的问题是程序跑不了，具体表现是运行到init_Key()函数入口时，直接死循环，并不能进入init_Key函数进行按键初始化设置。
下面是程序：
#include "S32K144.h" /* include peripheral declarations S32K144 */
#define PTB4 4 /* Port PTB4, bit 4 :FRDM EVB output to red LED*/
#define PTD15 15 /* Port PTD15, bit 15 :FRDM EVB input from BTN0 [SW2]*/
int idle_counter = 0;
int PTD15_flag_counter = 0;
void init_IRQs (void) {
FSL_NVIC->ICPR[1] = 1 << (78 % 32); /* IRQ78-PTD ch0: clr any pending IRQ*/
FSL_NVIC->ISER[1] = 1 << (78 % 32); /* IRQ78-PTD ch0: enable IRQ */
FSL_NVIC->IP[78] = 0xA; /* IRQ78-PTD ch0: priority 10 of 0-15*/
}
void Init_ports(void)
{
/* Enable clocks to peripherals (PORT modules) */
PCC-> PCCn[PCC_PORTB_INDEX] = PCC_PCCn_CGC_MASK; /* Enable clock to PORT B */
PTB->PDDR |= 1<<PTB4; /* Port B4: Data Direction= output */
PORTB->PCR[4] = 0x00000100; /* Port B4: MUX = GPIO */
}
void init_Key(void)
{
/* Configure port D15 as INT input (BTN 0 [SW2] on EVB) */
PCC-> PCCn[PCC_PORTD_INDEX] = PCC_PCCn_CGC_MASK; /* Enable clock to PORT D */
PTD->PDDR &= ~(1<<PTD15); /* Port D15: Data Direction= input (default) */
PORTD->PCR[15] = 0x000A0102;
/*Port D15: ISF flag and Interrupt on falling-edge, MUX = GPIO, Pull Enabled */
}
void disable_WDOG (void){
WDOG->CNT=0xD928C520; /*Unlock watchdog*/
WDOG->TOVAL=0x0000FFFF; /*Maximum timeout value*/
WDOG->CS = 0x00002100; /*Disable watchdog*/
}
int main(void)
{
disable_WDOG();
Init_ports(); /*Configure ports*/
init_IRQs(); /*Enable GPIO interrupts and priorities*/
init_Key(); /*Initialize PTD15 as GPIO interrupts*/
for(;;)
{
idle_counter++;
}
}
void PORTD_IRQHandler(void)
{
PTD15_flag_counter++;
PTB->PTOR |= 1<<4; /* Toggle output on port B4 (blue LED) */
PORTD->ISFR &= ~(1<<PTD15);
PORTD->PCR[15] |= 0x01000000;
}
下面是参考的S32DS提供的定时器中断程序：
/*
* hello_interrupts.c Copyright NXP 2016
* Description: Minimal interrupt example using LPIT0 chan 0 (vector 64)
* 2016 Mar 04 S Mihalik - Initial Version
*
*/
#include "derivative.h" /* include peripheral declarations S32K144 */
#include "clocks_and_modes.h" /* include peripheral declarations S32K144 */
int idle_counter = 0; /* main loop idle counter */
int lpit0_ch0_flag_counter = 0; /* LPIT0 chan 0 timeout counter */
void init_IRQs (void) {
FSL_NVIC->ICPR[1] = 1 << (48 % 32); /* IRQ48-LPIT0 ch0: clr any pending IRQ*/
FSL_NVIC->ISER[1] = 1 << (48 % 32); /* IRQ48-LPIT0 ch0: enable IRQ */
FSL_NVIC->IP[48] = 0xA; /* IRQ48-LPIT0 ch0: priority 10 of 0-15*/
}
void init_ports (void) {
PCC-> PCCn[PCC_PORTB_INDEX] = PCC_PCCn_CGC_MASK; /* Enable clock for PORT B */
PTB->PDDR |= 1<<4; /* Port B4: Data Direction= output */
PORTB->PCR[4] = 0x00000100; /* Port B4: MUX = ALT1, GPIO (to blue LED on EVB) */
}
void init_LPIT0 (void) {
PCC->PCCn[PCC_LPIT0_INDEX] = PCC_PCCn_PCS(6); /* Clock Src = 6 (SPLL2_DIV2_CLK)*/
PCC->PCCn[PCC_LPIT0_INDEX] |= PCC_PCCn_CGC_MASK; /* Enable clk to LPIT0 regs */
LPIT0->MCR = 0x00000001; /* DBG_EN-0: Timer chans stop in Debug mode */
/* DOZE_EN=0: Timer chans are stopped in DOZE mode */
/* SW_RST=0: SW reset does not reset timer chans, regs */
/* M_CEN=1: enable module clk (allows writing other LPIT0 regs) */
LPIT0->MIER = 0x00000001; /* TIE0=1: Timer Interrupt Enabled fot Chan 0 */
LPIT0->TVAL0 = 80000000; /* Chan 0 Timeout period: 80M clocks */
LPIT0->TCTRL0 = 0x00000001; /* T_EN=1: Timer channel is enabled */
/* CHAIN=0: channel chaining is disabled */
/* MODE=0: 32 periodic counter mode */
/* TSOT=0: Timer decrements immediately based on restart */
/* TSOI=0: Timer does not stop after timeout */
/* TROT=0 Timer will not reload on trigger */
/* TRG_SRC=0: External trigger soruce */
/* TRG_SEL=0: Timer chan 0 trigger source is selected*/
}
void disable_WDOG (void){
WDOG->CNT=0xD928C520; /*Unlock watchdog*/
WDOG->TOVAL=0x0000FFFF; /*Maximum timeout value*/
WDOG->CS = 0x00002100; /*Disable watchdog*/
}
int main(void) {
disable_WDOG();
init_ports(); /* Configure ports */
init_SOSC_8MHz(); /* Initialize system oscilator for 8 MHz xtal */
init_SPLL_80MHz(); /* Initialize SPLL to 80 MHz with 8 MHz SOSC */
NormalRUNmode_80MHz(); /* Init clocks: 80 MHz SPLL & core, 40 MHz bus, 20 MHz flash */
init_IRQs(); /* Enable desired interrupts and priorities */
init_LPIT0(); /* Initialize PIT0 for 1 second timeout */
for (;;) {
idle_counter++;
}
}
void LPIT0_Ch0_IRQHandler (void) {
lpit0_ch0_flag_counter++; /* Increment LPIT0 timeout counter */
PTB->PTOR |= 1<<4; /* Toggle output on port D0 (blue LED) */
LPIT0->MSR |= LPIT_MSR_TIF0_MASK; /* Clear LPIT0 timer flag 0 */
}
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