Closed
Description
In certain configurations the NCS36510 crashes with a hard fault when entering deep sleep mode with interrupts disabled. When single stepping through the same code with a debugger a crash does not occur. Additionally adding breakpoints after the WFI instruction makes the crash go away, but may not be a robust solution.
Example program which can reproduce the crash (needs to be build with IAR - mbed compile -t IAR -m NCS36510 --profile debug) :
#include "mbed.h"
DigitalOut led1(LED1);
LowPowerTicker ticker;
void blink()
{
led1 = !led1;
}
#define ENABLE (uint8_t)0x01
#define DISABLE (uint8_t)0x00
#define MAC_LUT_SIZE (uint8_t)96
void test_sleep()
{
SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
PMUREG->CONTROL.BITS.ENCOMA = DISABLE;
/** Enter into deep sleep mode */
__ISB();
__WFI();
// Uncomment the below two lines to fix the hardfault
//__NOP();
//__NOP();
/** Wait for the external 32MHz to be power-ed up & running
* Re-power down the 32MHz internal osc
*/
while (!CLOCKREG->CSR.BITS.XTAL32M);
PMUREG->CONTROL.BITS.INT32M = 1;
}
void test_func()
{
test_sleep();
}
int main() {
ticker.attach_us(blink, 500 * 1000);
printf("Running test\r\n");
core_util_critical_section_enter();
test_func();
core_util_critical_section_exit();
printf("Test completed\r\n");
}Hex and elf files build at mbed-os revision e12f116 with above program can be found here:
ncs32510_files.zip
IAR version used to build:
IAR Embedded Workbench for ARM - 7.80.4.12495
IAR Embedded Workbench shared components - 7.5.6.4719