Hi all,
I tried porting MyNewt (apache-mynewt-core 1.8.0) to a custom board
based on the STM32F051K8 MCU.
Probably irrelevant board details:
https://github.com/hackdaworld/gmote/tree/master/pcb/arm
and likely more relevant software details:
https://github.com/hackdaworld/gmote/tree/master/firmware/mynewt
The first thing I noticed is, that a simple os_time_delay followed by
console_printf loop only works if TIMER_0_TIM is one of the TIM1{5,6,7}
timers. It's not working with timers 1, 2, 3, 14 and 6. There is no
console output at all!
Is there are an obvious reason for that, which I just can't see?
Since timers 15, 16 and 17 work as expected, I continued with
TIMER_0_TIM: 'TIM15'
TIMER_1_TIM: 'TIM16'
using TIMER_1 for LoRaWAN
LORA_MAC_TIMER_NUM: "1"
TIMER_1: "1"
which leads to a crash and system restart due to an unhandled interrupt
while trying an OTAA join:
000032 GMote on ARM
000093 Joining ...
001096 Hello World! 0
001575 Unhandled interrupt (3), exception sp 0x20001530
001575 r0:0x20001f2c r1:0x200010ac r2:0x00000627 r3:0x00000000
001575 r4:0x0800515f r5:0x00000000 r6:0x20001738 r7:0x20001758
001575 r8:0x00000000 r9:0x08006101 r10:0xffffffff r11:0xffffffff
001575 r12:0x0000003a lr:0x0800583d pc:0x08003a14 psr:0x21000000
001575 ICSR:0x0440f003
001575 task:loramac
001575 0x2000155c: 0x0800583d
001575 0x20001564: 0x0800b4c9
001575 0x2000156c: 0x08006d43
001575 0x20001570: 0x08000dfe
001575 0x2000157c: 0x00000000
001575 0x20001584: 0x080016c5
001575 0x20001588: 0x08006101
001575 0x2000159c: 0x0800171b
001575 0x200015a4: 0x08006109
001575 0x200015ac: 0x08000dcd
The pc is at ...
0x8003a14 is in hal_timer_stop
(repos/apache-mynewt-core/hw/mcu/stm/stm32_common/src/hal_timer.c:777).
777 TAILQ_REMOVE(&tmr->sht_timers, timer, link);
which gets called by
0x800583d is in os_cputime_timer_stop
(repos/apache-mynewt-core/kernel/os/src/os_cputime.c:113).
and - going back the stack - probably gets called by
0x800b4c9 is in SX1276SetSleep
(repos/apache-mynewt-core/hw/drivers/lora/sx1276/src/sx1276.c:911).
911 os_cputime_timer_stop(&TxTimeoutTimer);
So, again, the timer is involved. And since I do not know much about the
OS I looked around focusing on timer related stuff. One thing that looks
wrong to me is the repeated init of the timer that is used for LoRaWAN.
In hal_bsp.c
- stm32_periph_create is called
- lora_bsp_enable_mac_timer is provided
The last one calls hal_timer_init on TIMER_1 at some point.
But, TIMER_1 is likewise initialized by stm32_periph_create.
However removing the init of TIMER_1 in stm32_periph_create_timers
yields the same crash.
I am going to investigate this further, since I want to get a better
understanding of the OS anyways. However, I thought that maybe someone
here already knows what's up or has a good advice where to look at. Any
ideas?
Thanks and all the best,
Frank
PS: More addresses located in stack:
0x8006d43 is in lora_mac_process_radio_tx
(repos/apache-mynewt-core/net/lora/node/src/mac/LoRaMac.c:818).
818 uint32_t curTime = hal_timer_read(LORA_MAC_TIMER_NUM);
0x8000dfe is in os_arch_restore_sr
(repos/apache-mynewt-core/hw/cmsis-core/src/ext/cmsis_gcc.h:131).
129 __STATIC_FORCEINLINE void __enable_irq(void)
130 {
131 __ASM volatile ("cpsie i" : : : "memory");
132 }
0x80016c5 is in os_eventq_get
(repos/apache-mynewt-core/kernel/os/src/os_eventq.c:145).
145 OS_ENTER_CRITICAL(sr);
0x8006101 is in lora_mac_task
(repos/apache-mynewt-core/net/lora/node/src/lora_node.c:402).
400 void
401 lora_mac_task(void *arg)
402 {
403 /* Process events */
404 while (1) {
405 os_eventq_run(&g_lora_mac_data.lm_evq);
406 }
0x800171b is in os_eventq_run
(repos/apache-mynewt-core/kernel/os/src/os_eventq.c:196).
196 ev->ev_cb(ev);
0x8006109 is in lora_mac_task
(repos/apache-mynewt-core/net/lora/node/src/lora_node.c:405).
400 void
401 lora_mac_task(void *arg)
402 {
403 /* Process events */
404 while (1) {
405 os_eventq_run(&g_lora_mac_data.lm_evq);
406 }
407 }
0x8000dcd is in os_arch_task_return_handler
(repos/apache-mynewt-core/kernel/os/src/arch/cortex_m0/os_arch_arm.c:154).
149 {
150 /*
151 * If you are stuck here it means that task finished by
152 * simple return which is not supported.
153 */
154 while (1);
155 }
