Hi,
I'm working with KL25 on freedom board.I have a question about LLWU module and enter-exit from LLS mode.
I have written 3 projects to weakup my mcu from lls mode.I tried with the TSI ,LPTMR and the external pin ,using them as the source of LLWU.But the outcom is the same.Every time,when the interrupt happened ,the MCU will reset.
Here is the simplest one.Using the extern pin as the source of LLWU:
void LLWU_Init(void);
uint8 llwu_wake_up_flag=0; //the flag of weekup
int main()
{
uart_init(UART1_BASE_PTR, 24000, 9600);
GPIO_Init(PORTC, 16, GPIO_OUTPUT, 0); //led on
GPIO_Init(PORTC, 3, GPIO_INPUT, 0); //the souce of LLWU is a gpio input button
uart_putchar( UART1_BASE_PTR,'W'); //send a char
LLWU_Init();
while(1)
{
enter_lls();
if(key_weakup==1) //weak up form LLS
{
GPIO_SetBit(PORTC,16); //led off
Delay1Us(20000);
uart_putchar( UART1_BASE_PTR,'Y');
}
else
{
Delay1Us(20000);
uart_putchar( UART1_BASE_PTR,'N');
}
}
}
void LLWU_Init(void)
{
enable_irq(LLWU_irq_no);
llwu_configure(0x0080, 0x02, 0x00); // External input enabled as falling edge detection
}
void enter_lls(void)
{
volatile unsigned int dummyread;
/* Write to PMPROT to allow LLS power modes this write-once
bit allows the MCU to enter the LLS low power mode*/
SMC_PMPROT = SMC_PMPROT_ALLS_MASK;
/* Set the STOPM field to 0b011 for LLS mode */
SMC_PMCTRL &= ~SMC_PMCTRL_STOPM_MASK;
SMC_PMCTRL |= SMC_PMCTRL_STOPM(0x3);
/*wait for write to complete to SMC before stopping core */
dummyread = SMC_PMCTRL;
dummyread++;
/* Now execute the stop instruction to go into LLS */
#ifdef CMSIS
/* Set the SLEEPDEEP bit to enable deep sleep mode (STOP) */
SCB_SCR |= SCB_SCR_SLEEPDEEP_MASK;
__wfi();
#else
stop();
#endif
}
void llwu_configure(unsigned int pin_en, unsigned char rise_fall, unsigned char module_en ) {
uint8 temp;
temp = LLWU_PE2;
if( pin_en & 0x0080)
{
temp |= LLWU_PE2_WUPE7(rise_fall);
printf("\n LLWU configured pins PTC3/SCI1_RX/FTM0_CH2 is LLWU wakeup source ");
LLWU_F1 |= LLWU_F1_WUF7_MASK; // write one to clear the flag
}
LLWU_PE2 = temp;
}
void llwu_isr(void){
printf("go to LLWU INT");
if (LLWU_F1 & LLWU_F1_WUF7_MASK) {
// printf("****WUF7 was set from PTC3 input *****\r\n");
LLWU_F1 |= LLWU_F1_WUF7_MASK; // write one to clear the flag
key_weakup=1;
}
NVIC_ICPR |= 1 << (LLWU_irq_no%32);
}
Here is the outcome:
whenever I press the button.The mcu will reset,send a 'w' to the uart1 and print the information of llwu init. I don't know why.Could anybody help me?I am really anxious.
Seems you didn't disable the clock monitor before enter LLS mode, please try the following code instead.
void LLWU_Init(void)
{
clk_monitor_0(OFF);
enable_irq(LLWU_irq_no);
llwu_configure(0x0080, 0x02, 0x00); // External input enabled as falling edge detection
}
I also attached my test project here.
Press any key to enter lls , and pull PTC3 down would wake up the device:
Hope that helps,
B.R
Kan
Seems you didn't disable the clock monitor before enter LLS mode, please try the following code instead.
void LLWU_Init(void)
{
clk_monitor_0(OFF);
enable_irq(LLWU_irq_no);
llwu_configure(0x0080, 0x02, 0x00); // External input enabled as falling edge detection
}
I also attached my test project here.
Press any key to enter lls , and pull PTC3 down would wake up the device:
Hope that helps,
B.R
Kan
