hi
is there a way to reset the currently running sketch on the maple mini from within the running sketch?
i remember reading something on the arduino forum about this.
i have the maple act as a dmx receiver and want to be able to reset the sketch if no new data has been received for x seconds.
i did read on this forum about using a 555 timer to triggered the reset pin for a long enough time to cause the maple read boot.
but my hardware is done and i can't add anything at this point.
thanks.
gbulmer
Moderator
stephanschulz - How 'resety' do you need?
There has been a thread here about it, but IIRC, it doesn't achieve everything that a hard reset achieves.
The RM0008 manual says, in "section 7.1 Reset":
There are three types of reset, defined as system reset, power reset and backup domain reset.
7.1.1 System reset
A system reset sets all registers to their reset values except the reset flags in the clock controller CSR register and the registers in the Backup domain (see Figure 4).
A system reset is generated when one of the following events occurs:
1. A low level on the NRST pin (external reset)
2. Window watchdog end of count condition (WWDG reset)
3. Independent watchdog end of count condition (IWDG reset)
4. A software reset (SW reset) (see Software reset)
5. Low-power management reset (see Low-power management reset)
The reset source can be identified by checking the reset flags in the Control/Status register, RCC_CSR (see Section 7.3.10: Control/status register (RCC_CSR))."
So you could force a Software Reset.
The manual goes on to say:
"Software reset
The SYSRESETREQ bit in Cortex™-M3 Application Interrupt and Reset Control Register must be set to force a software reset on the device. Refer to the STM32F10xxx Cortex-M3 programming manual (see Related documents on page 1) for more details."
In PM0056, it says the SYSRESETREQ bit is in the SCB_AIRCR register ("4.4.5 Application interrupt and reset control register (SCB_AIRCR)"
So it looks like setting
*(SCB_AIRCR) |= SCB_AIRCR_SYSRESETREQ
might do the trick
#define SCB_AIRCR ((uint32*) 0xE000ED00 + 0x0C)
#define SCB_AIRCR_SYSRESETREQ (1 << 2)
I think ala42, and a few others might be more definitive; I haven't tried it.
LeafLabs say Maple resets via SCB_AIRCR: http://forums.leaflabs.com/topic.php?id=1691#post-10593
thanks. i will try your suggestions
i also found this
http://electronics.stackexchange.com/questions/31603/stm32-performing-a-software-reset
about the CMSIS Library for System Software Reset
s.
i did a quick little test but it does not look like it resets
#define SCB_AIRCR ((uint32*) 0xE000ED00 + 0x0C)
#define SCB_AIRCR_SYSRESETREQ (1 << 2)
unsigned long resetTimer;
boolean initDone;
void setup() {
// Set up the built-in LED pin as an output:
pinMode(BOARD_LED_PIN, OUTPUT);
initDone = false;
resetTimer = millis();
}
void loop() {
if(initDone == false){
toggleLED(); // Turn the LED from off to on, or on to off
delay(1000);
toggleLED(); // Turn the LED from off to on, or on to off
delay(1000);
toggleLED(); // Turn the LED from off to on, or on to off
delay(1000);
initDone = true;
}
// digitalWrite(BOARD_LED_PIN,HIGH);
if(millis() - resetTimer > 10000){
resetTimer = millis();
digitalWrite(BOARD_LED_PIN,LOW);
delay(500);
digitalWrite(BOARD_LED_PIN,HIGH);
delay(500);
digitalWrite(BOARD_LED_PIN,LOW);
delay(500);
digitalWrite(BOARD_LED_PIN,HIGH);
delay(500);
*(SCB_AIRCR) |= SCB_AIRCR_SYSRESETREQ;
}
// Wait for 1 second (1000 milliseconds)
}
gbulmer
Moderator
stephanschulz - Thank you for the link to the CMSIS explanation. I apologise for not reading the whole SCB_AIRCR register description. Thanks also for being my guinea-pig :-)
The PM0056 manual says
"Bits 31:16 VECTKEYSTAT[15:0]/ VECTKEY[15:0] Register key
Reads as 0xFA05
On writes, write 0x5FA to VECTKEY, otherwise the write is ignored."
So, defining an extra value
#define SCB_AIRCR_VECTKEY ((uint32)0xFA05 << 16)
and doing
*(SCB_AIRCR) |= SCB_AIRCR_SYSRESETREQ | SCB_AIRCR_VECTKEY;
might get a bit further.
I expect it to work, but there may be something else going on.
(I notice that the CMSIS code is careful to preserve bits 8-10 of the SCB_AIRCR register, but I don't think anything sets that. I may be wrong)
Edit:
I'll add, what you are doing does look like the use for a watchdog timer. The STM32's have two different types built in. A watchdog will likely take longer to try, debug and use, so I wouldn't suggest you divert until this "SCB_AIRCR" works.
However a watchdog timer may be a good solution. It triggers an exception after a programmed period. That exception could use this software reset code. The watchdog 'triggers' if the program doesn't 'ping' it often enough (or even too often). So instead of tracking time in your code, your code 'pings' the timer often enough. say every time round loop(), and the timer resets itself. You might not bother if your code is pretty straightforward, but if you are concerned that it might get 'stuck' somewhere, a watchdog timer might be the solution.
Call systemHardReset().
Your SCB_AIRCR_SYSRESETREQ definition is bad, as it misses the upper bits that need to be set.
From usb_hardware.h/c:
#define AIRCR_RESET 0x05FA0000
#define AIRCR_RESET_REQ (AIRCR_RESET | (u32)0x04);
void systemHardReset(void) {
SCB_TypeDef* rSCB = (SCB_TypeDef *) SCB_BASE;
typedef void (*funcPtr)(void);
/* Reset */
rSCB->AIRCR = (u32)AIRCR_RESET_REQ;
/* Should never get here */
while (1) {
asm volatile("nop");
}
}>So, defining an extra value
>#define SCB_AIRCR_VECTKEY ((uint32)0xFA05 << 16)
Close, but wrong byte order :)
@ala42
just to be clear are you saying all i need to do is add posted code to my code and call systemHardReset() when want to reset?
i tried but got these errors:
<BUILD>/Blink.cpp: In function 'void systemHardReset()':
<BUILD>/Blink.cpp:27: error: 'rSCB' was not declared in this scope
<BUILD>/Blink.cpp:27: error: 'u32' was not declared in this scope
<BUILD>/Blink.cpp:27: error: expected ')' before ';' token
<BUILD>/Blink.cpp:27: error: expected primary-expression before '|' token
<BUILD>/Blink.cpp:27: error: expected ';' before numeric constant
gbulmer
Moderator
stephanschulz - The errors would be fixed if you downloaded and installed ala42's source.
I believe this is everything needed:
#define SCB_AIRCR ((volatile uint32*) 0xE000ED00 + 0x0C)
#define SCB_AIRCR_SYSRESETREQ (1 << 2)
#define SCB_AIRCR_RESET ((0x05FA0000) | SCB_AIRCR_SYSRESETREQ)
*SCB_AIRCR |= SCB_AIRCR_RESET;
It should never reach the next line, because it has done a reset.
If it does reach the next line, then the reset failed.
gbulmer
Moderator
This seems to work fine on a Maple mini:
/*
BlinkReset
by stephanschulz & gbulmer
*/
#define SCB_AIRCR ((volatile uint32*) 0xE000ED00 + 0x0C)
#define SCB_AIRCR_SYSRESETREQ (1 << 2)
#define SCB_AIRCR_RESET ((0x05FA0000) | SCB_AIRCR_SYSRESETREQ)
unsigned long resetTimer;
boolean initDone;
void setup() {
// Set up the built-in LED pin as an output:
pinMode(BOARD_LED_PIN, OUTPUT);
initDone = false;
resetTimer = millis();
}
void loop() {
if(initDone == false){
toggleLED(); // Turn the LED from off to on, or on to off
delay(100);
toggleLED(); // Turn the LED from off to on, or on to off
delay(100);
toggleLED(); // Turn the LED from off to on, or on to off
delay(100);
initDone = true;
}
// digitalWrite(BOARD_LED_PIN,HIGH);
if(millis() - resetTimer > 10000){
resetTimer = millis();
digitalWrite(BOARD_LED_PIN,LOW);
delay(500);
digitalWrite(BOARD_LED_PIN,HIGH);
delay(500);
digitalWrite(BOARD_LED_PIN,LOW);
delay(500);
digitalWrite(BOARD_LED_PIN,HIGH);
delay(500);
*(SCB_AIRCR) |= SCB_AIRCR_SYSRESETREQ; // Does a System Reset, and never returns
}
// Wait for 1 second (1000 milliseconds)
toggleLED(); // Turn the LED from off to on, or on to off
delay(1000);
}It slow blinks 5 times (2 second cycle), then does two rapid blinks when it times-out, then resets. The reset switches the LED off.
I'd probably write
if ( !initDone) {
instead of
if(initDone == false){
but I didn't want to change it too much.
all this blinking confuses me.
i made this serial print example with your reset code, but it does not seem to reset; i.e. start with setup()
#define SCB_AIRCR ((volatile uint32*) 0xE000ED00 + 0x0C)
#define SCB_AIRCR_SYSRESETREQ (1 << 2)
#define SCB_AIRCR_RESET ((0x05FA0000) | SCB_AIRCR_SYSRESETREQ)
int cnt;
void setup() {
pinMode(BOARD_LED_PIN, OUTPUT);
digitalWrite(BOARD_LED_PIN,HIGH);
SerialUSB.println("hi");
cnt = 0;
}
void loop(){
SerialUSB.println(cnt);
cnt++;
delay(500);
if(millis() > 10000){
SerialUSB.println("reset");
*(SCB_AIRCR) |= SCB_AIRCR_SYSRESETREQ;
}
}i am also not sure which steps i should take to follow this advice of yours
"The errors would be fixed if you downloaded and installed ala42's source."
i copy pasted ala42's code in to my sketch, which did not work.
i pasted his code in to a separate .h file and included is like a library. so success.
i am sorry man. you really gotta take this newbie by the hands. :(
gbulmer
Moderator
stephanschulz - I think it is resetting, it's the USBSerial which might not be working.
I strongly recommend you debug using LEDs which are synchronous (and easy) and not SerialUSB (which is asynchronous and messy).
Have a look at:
http://leaflabs.com/docs/lang/api/serialusb.html#examples
to see how to get that going if it is critical.
I'd do a countdown in loop():
if (millis() < 10000) {
toggleLED();
delay(500);
}(Not compiled)
So that you can see something happening.
AFAIK, SerailUSB relies on asynchronous interrupts to send characters up to the host PC.
So it is possible that the reset could happen *before* any characters printed by SerialUSB.println("reset"); are sent from the Maple up the USB interface to the host PC.
You could prove that it is in setup by blinking the LED for a while with a distinct duration (and maybe increase the timeout from 10000 to make it easy to see what is happening)
What I meant by download ala42's code is, go to ala42's web site or git, find and download all ala42's library source code, put it in the right place, then set up everything to use it.
I think if you haven't done anything like this before, it might take you at least a few hours to get everything working in a way you understand. If this is very new, and you are not familiar with the command line, make, gcc and binutils, it might take days.
first, thanks for taking the time.
here is a simple blinking code that should
boot
led off for 5 seconds
led blink until > 15 seconds
led on
reset
boot ...
but
it never seems to reset because the led stays on solid after 15 seconds
#define SCB_AIRCR ((volatile uint32*) 0xE000ED00 + 0x0C)
#define SCB_AIRCR_SYSRESETREQ (1 << 2)
#define SCB_AIRCR_RESET ((0x05FA0000) | SCB_AIRCR_SYSRESETREQ)
boolean state;
void setup() {
pinMode(BOARD_LED_PIN, OUTPUT);
state = false;
digitalWrite(BOARD_LED_PIN,state);
delay(5000);
}
void loop() {
if (millis() < 15000) {
state = !state;
digitalWrite(BOARD_LED_PIN,state);
delay(500);
}
else{
digitalWrite(BOARD_LED_PIN,HIGH);
*(SCB_AIRCR) |= SCB_AIRCR_SYSRESETREQ;
}
}very very nice. thank you. this made it work for both the blink test and the serial test.
here are my two test sketches:
serial test
#define SCB_AIRCR ((volatile uint32*) (0xE000ED00 + 0x0C))
#define SCB_AIRCR_SYSRESETREQ (1 << 2)
#define SCB_AIRCR_RESET ((0x05FA0000) | SCB_AIRCR_SYSRESETREQ)
int cnt = 0;
void setup() {
pinMode(BOARD_LED_PIN, OUTPUT);
digitalWrite(BOARD_LED_PIN,HIGH);
SerialUSB.println("hi");
cnt = 0;
}
void loop(){
SerialUSB.println(cnt);
cnt++;
delay(500);
if(millis() > 10000){
SerialUSB.println("reset");
*(SCB_AIRCR) = SCB_AIRCR_RESET;
}
}blink test
#define SCB_AIRCR ((volatile uint32*) (0xE000ED00 + 0x0C))
#define SCB_AIRCR_SYSRESETREQ (1 << 2)
#define SCB_AIRCR_RESET ((0x05FA0000) | SCB_AIRCR_SYSRESETREQ)
boolean state;
void setup() {
pinMode(BOARD_LED_PIN, OUTPUT);
state = false;
digitalWrite(BOARD_LED_PIN,state);
delay(5000);
}
void loop() {
if (millis() < 15000) {
state = !state;
digitalWrite(BOARD_LED_PIN,state);
delay(500);
}
else{
digitalWrite(BOARD_LED_PIN,HIGH);
// *(SCB_AIRCR) |= SCB_AIRCR_SYSRESETREQ;
*(SCB_AIRCR) = SCB_AIRCR_RESET;
}
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