mhu/reflow-oven-control-sw
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Shorten wtchdog trigger interval to 1.25 seconds nominal. This will ensure the internal watchdog triggers before the external one

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This commit is contained in:
Mario Hüttel 2023-06-09 00:04:32 +02:00
parent df593e2ab2
commit 1300fe88a4
4 changed files with 40 additions and 14 deletions
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10
stm-firmware/include/reflow-controller/safety/safety-config.h
View File

@ -126,7 +126,15 @@ enum analog_value_monitor {
#define WATCHDOG_HALT_DEBUG (0)
#endif
#define WATCHDOG_PRESCALER 16
/**
* @brief Watchdog clock prescaler value
*/
#define WATCHDOG_PRESCALER (16)
/**
* @brief Watchdog reload value
*/
#define WATCHDOG_RELOAD_VALUE (2500)
/**
* @brief Minimum number of bytes that have to be free on the stack. If this is not the case, an error is detected

12
stm-firmware/include/reflow-controller/safety/watchdog.h
View File

@ -27,11 +27,19 @@
/**
* @brief Setup the watchdog for the safety controller
* @param Prescaler to use for the 32 KHz LSI clock
*
* The watchdog timeout can be calculated with:
* \f[ t = \frac{(\mathrm{RELOAD_VAL} + 1)\cdot \mathrm{PRESCALER}}{32000 } s\f]
*
* Valid prescaler values are: 4, 8, 16, 32, 64, 128, 256.
* @param prescaler Prescaler to use for the 32 KHz LSI clock
* @param reload_value Reload value to reload the timer with when reset. 0 to 0xFFF
* @return 0 if successful
* @return -1 if prescaler is wrong
* @return -2 if a reload value > 0xFFF is selected. 0xFFF will be used in this case
* @note Once the watchdog is enabled, it cannot be turned off!
*/
int watchdog_setup(uint8_t prescaler);
int watchdog_setup(uint16_t prescaler, uint16_t reload_value);
/**
* @brief Reset watchdog counter

3
stm-firmware/safety/safety-controller.c
View File

@ -322,6 +322,7 @@ static const struct crc_monitor_register safety_adc_crc_regs[] = {
static const struct crc_monitor_register misc_config_crc_regs[] = {
/* Check clock tree settings */
CRC_MON_REGISTER_ENTRY(RCC->CR, RCC_CR_PLLON | RCC_CR_HSEON | RCC_CR_PLLI2SON | RCC_CR_HSION, 4),
CRC_MON_REGISTER_ENTRY(RCC->CSR, RCC_CSR_LSION, 4),
CRC_MON_REGISTER_ENTRY(RCC->CFGR, RCC_CFGR_SWS | RCC_CFGR_HPRE | RCC_CFGR_PPRE1 | RCC_CFGR_PPRE2, 4),
CRC_MON_REGISTER_ENTRY(RCC->PLLCFGR, RCC_PLLCFGR_PLLM | RCC_PLLCFGR_PLLQ | RCC_PLLCFGR_PLLSRC | RCC_PLLCFGR_PLLP | RCC_PLLCFGR_PLLN | RCC_PLLCFGR_PLLM , 4),
/* Check Flash settings */
@ -972,7 +973,7 @@ void safety_controller_init(void)
MEAS_ADC_SAFETY_FLAG_KEY);
safety_adc_init();
watchdog_setup(WATCHDOG_PRESCALER);
(void)watchdog_setup(WATCHDOG_PRESCALER, WATCHDOG_RELOAD_VALUE);
if (rcc_manager_get_reset_cause(false) & RCC_RESET_SOURCE_IWDG)
safety_controller_report_error(ERR_FLAG_WTCHDG_FIRED);

29
stm-firmware/safety/watchdog.c
View File

@ -42,9 +42,10 @@
*/
#define STM32_WATCHDOG_REGISTER_ACCESS_KEY 0x5555
int watchdog_setup(uint8_t prescaler)
int watchdog_setup(uint16_t prescaler, uint16_t reload_value)
{
uint32_t prescaler_reg_val;
int ret = 0;
/** - Activate the LSI oscillator */
RCC->CSR |= RCC_CSR_LSION;
@ -53,20 +54,24 @@ int watchdog_setup(uint8_t prescaler)
while (!(RCC->CSR & RCC_CSR_LSIRDY))
;
if (prescaler == 4U)
if (prescaler == 4U) {
prescaler_reg_val = 0UL;
else if (prescaler == 8U)
} else if (prescaler == 8U) {
prescaler_reg_val = 1UL;
else if (prescaler == 16U)
} else if (prescaler == 16U) {
prescaler_reg_val = 2UL;
else if (prescaler == 32U)
} else if (prescaler == 32U) {
prescaler_reg_val = 3UL;
else if (prescaler == 64U)
} else if (prescaler == 64U) {
prescaler_reg_val = 4UL;
else if (prescaler == 128U)
} else if (prescaler == 128U) {
prescaler_reg_val = 5UL;
else
} else if (prescaler == 256U) {
prescaler_reg_val = 6UL;
} else {
prescaler_reg_val = 6UL;
ret = -1;
}
/** - (De)activate the watchdog during debug access according to @ref WATCHDOG_HALT_DEBUG */
if (WATCHDOG_HALT_DEBUG)
@ -88,7 +93,11 @@ int watchdog_setup(uint8_t prescaler)
while (IWDG->SR & IWDG_SR_RVU)
;
/** - Set reload value fixed to 0xFFF */
/** - Set reload value */
if (reload_value > 0xFFFu) {
reload_value = 0xFFFFu;
ret = -2;
}
IWDG->RLR = 0xFFFU;
/** - Write enable key */
@ -97,7 +106,7 @@ int watchdog_setup(uint8_t prescaler)
/** - Do a first reset of the counter. This also locks the config regs */
watchdog_ack(WATCHDOG_MAGIC_KEY);
return 0;
return ret;
}
int watchdog_ack(uint32_t magic)