mhu/reflow-oven-control-sw
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Add safety management in PID handler and main loop

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This commit is contained in:
Mario Hüttel 2020-06-14 19:09:59 +02:00
parent a33154b2d0
commit cbd28f9a12
5 changed files with 129 additions and 18 deletions
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23
stm-firmware/include/reflow-controller/oven-driver.h
View File

@ -25,9 +25,28 @@
#include <stdbool.h>
#include <reflow-controller/pid-controller.h>
enum oven_pid_error_report {
OVEN_PID_NO_ERROR = 0,
OVEN_PID_ERR_PT1000_ADC_WATCHDOG = (1<<0),
OVEN_PID_ERR_PT1000_ADC_OFF = (1<<1),
OVEN_PID_ERR_PT1000_OTHER = (1<<2),
OVEN_PID_ERR_VREF_TOL = (1<<3),
OVEN_PID_ERR_OVERTEMP = (1<<4),
};
struct oven_pid_errors {
bool generic_error;
bool pt1000_adc_watchdog;
bool pt1000_adc_off;
bool pt1000_other;
bool vref_tol;
bool controller_overtemp;
};
struct oven_pid_status {
bool active;
bool aborted;
struct oven_pid_errors error_flags;
float target_temp;
float current_temp;
uint64_t timestamp_last_run;
@ -41,11 +60,11 @@ void oven_driver_disable(void);
void oven_pid_init(struct pid_controller *controller_to_copy);
void oven_pid_handle(float target_temp, float current_temp);
void oven_pid_handle(float target_temp);
void oven_pid_stop();
void oven_pid_report_error(void);
void oven_pid_report_error(enum oven_pid_error_report report);
const struct oven_pid_status *oven_pid_get_status(void);

9
stm-firmware/include/reflow-controller/safety-adc.h
View File

@ -24,11 +24,10 @@
#include <stdint.h>
#include <stdbool.h>
#define SAFETY_ADC_FRAC_BITS (8)
#define SAFETY_ADC_VREF_VOLT (2.5)
#define SAFETY_ADC_VREF_TOL (0.25)
#define SAFETY_ADC_VREF_INT ()
#define SAFETY_ADC_VREF_MVOLT (2500.0f)
#define SAFETY_ADC_VREF_TOL_MVOLT (100.0f)
#define SAFETY_ADC_TEMP_LOW_LIM (0.0f)
#define SAFETY_ADC_TEMP_HIGH_LIM (65.0f)
enum safety_adc_meas_channel {SAFETY_ADC_MEAS_VREF, SAFETY_ADC_MEAS_TEMP};
enum safety_adc_check_result {

40
stm-firmware/main.c
View File

@ -198,13 +198,17 @@ static void zero_ccm_ram(void)
ptr[i] = 0UL;
}
volatile bool error_state = false;
volatile enum safety_adc_check_result safety_adc_status = SAFETY_ADC_CHECK_OK;
int main()
{
bool sd_card_mounted = false;
shellmatta_handle_t shell_handle;
int menu_wait_request;
uint64_t quarter_sec_timestamp = 0ULL;
enum safety_adc_check_result safety_adc_status;
const struct oven_pid_status *pid_status;
enum adc_pt1000_error pt1000_status;
zero_ccm_ram();
setup_system();
@ -215,14 +219,46 @@ int main()
while (1) {
sd_card_mounted = mount_sd_card_if_avail(sd_card_mounted);
pid_status = oven_pid_get_status();
if(systick_ticks_have_passed(quarter_sec_timestamp, 250)) {
safety_adc_status = handle_safety_adc();
quarter_sec_timestamp = systick_get_global_tick();
if (safety_adc_status & SAFETY_ADC_CHECK_TEMP_LOW || safety_adc_status & SAFETY_ADC_CHECK_TEMP_HIGH) {
oven_pid_report_error(OVEN_PID_ERR_OVERTEMP);
}
if (safety_adc_status & SAFETY_ADC_CHECK_VREF_LOW || safety_adc_status & SAFETY_ADC_CHECK_VREF_HIGH) {
oven_pid_report_error(OVEN_PID_ERR_VREF_TOL);
}
if (safety_adc_status & SAFETY_ADC_INTERNAL_ERROR) {
oven_pid_report_error(0);
}
if (error_state) {
led_set(1, !led_get(1));
} else {
led_set(1, 0);
}
pt1000_status = adc_pt1000_check_error();
}
error_state = pid_status->aborted | !!safety_adc_status | !!pt1000_status;
menu_wait_request = reflow_menu_handle();
/* Deactivate oven output in case of error! */
if (!pid_status->active || pid_status->aborted || error_state) {
oven_pid_stop();
oven_driver_set_power(0U);
}
handle_shell_uart_input(shell_handle);
menu_wait_request = reflow_menu_handle();
if (menu_wait_request)
__WFI();

51
stm-firmware/oven-driver.c
View File

@ -22,6 +22,8 @@
#include <reflow-controller/periph-config/oven-driver-hwcfg.h>
#include <stm-periph/clock-enable-manager.h>
#include <reflow-controller/systick.h>
#include <reflow-controller/adc-meas.h>
#include <reflow-controller/temp-converter.h>
static struct pid_controller oven_pid;
@ -76,29 +78,70 @@ void oven_pid_init(struct pid_controller *controller_to_copy)
oven_pid.output_sat_max = 100.0f;
oven_pid_current_status.timestamp_last_run = 0ULL;
oven_pid_current_status.active = true;
oven_pid_current_status.error_flags.vref_tol = false;
oven_pid_current_status.error_flags.pt1000_other = false;
oven_pid_current_status.error_flags.generic_error = false;
oven_pid_current_status.error_flags.pt1000_adc_off = false;
oven_pid_current_status.error_flags.controller_overtemp = false;
oven_pid_current_status.error_flags.pt1000_adc_watchdog = false;
}
void oven_pid_handle(float target_temp, float current_temp)
void oven_pid_handle(float target_temp)
{
float pid_out;
float current_temp;
int resistance_status;
enum adc_pt1000_error pt1000_error;
if (oven_pid_current_status.active) {
if (oven_pid_current_status.active && !oven_pid_current_status.aborted) {
if (systick_ticks_have_passed(oven_pid_current_status.timestamp_last_run,
(uint64_t)(oven_pid.sample_period * 1000))) {
resistance_status = adc_pt1000_get_current_resistance(&current_temp);
if (resistance_status < 0) {
oven_driver_set_power(0);
pt1000_error = adc_pt1000_check_error();
if (pt1000_error & ADC_PT1000_WATCHDOG_ERROR)
oven_pid_report_error(OVEN_PID_ERR_PT1000_ADC_WATCHDOG);
if (pt1000_error & ADC_PT1000_INACTIVE)
oven_pid_report_error(OVEN_PID_ERR_PT1000_ADC_OFF);
if (pt1000_error & ADC_PT1000_OVERFLOW)
oven_pid_report_error(OVEN_PID_ERR_PT1000_OTHER);
return;
}
(void)temp_converter_convert_resistance_to_temp(current_temp, &current_temp);
pid_out = pid_sample(&oven_pid, target_temp - current_temp);
oven_driver_set_power((uint8_t)pid_out);
oven_pid_current_status.timestamp_last_run = systick_get_global_tick();
oven_pid_current_status.active = true;
oven_pid_current_status.target_temp = target_temp;
oven_pid_current_status.current_temp = current_temp;
}
}
}
void oven_pid_report_error()
void oven_pid_report_error(enum oven_pid_error_report report)
{
struct oven_pid_errors *e = &oven_pid_current_status.error_flags;
oven_pid_current_status.active = false;
oven_pid_current_status.aborted = true;
if (report == 0) {
e->generic_error = true;
}
if (report & OVEN_PID_ERR_OVERTEMP)
e->controller_overtemp = true;
if (report & OVEN_PID_ERR_VREF_TOL)
e->controller_overtemp = true;
if (report & OVEN_PID_ERR_PT1000_OTHER)
e->pt1000_other = true;
if (report & OVEN_PID_ERR_PT1000_ADC_OFF)
e->pt1000_adc_off = true;
if (report & OVEN_PID_ERR_PT1000_ADC_WATCHDOG)
e->pt1000_adc_watchdog = true;
}
const struct oven_pid_status *oven_pid_get_status()

24
stm-firmware/safety-adc.c
View File

@ -20,7 +20,7 @@
#include <reflow-controller/safety-adc.h>
#include <reflow-controller/periph-config/safety-adc-hwcfg.h>
#include <helper-macros/helper-macros.h>
#include <stm-periph/clock-enable-manager.h>
void safety_adc_init()
@ -50,18 +50,32 @@ enum safety_adc_check_result safety_adc_check_results(uint16_t vref_result, uint
float *vref_calculated, float *temp_calculated)
{
enum safety_adc_check_result res = SAFETY_ADC_CHECK_OK;
float vref;
float temp;
vref = (SAFETY_ADC_INT_REF_MV * 4095.0f) / (float)vref_result;
if (vref_calculated) {
*vref_calculated = (SAFETY_ADC_INT_REF_MV * 4095.0f) / (float)vref_result;
*vref_calculated = vref;
}
temp = (((float)temp_result / 4095.0f * 2500.0f -
SAFETY_ADC_TEMP_NOM_MV) / SAFETY_ADC_TEMP_MV_SLOPE) + SAFETY_ADC_TEMP_NOM;
if (temp_calculated) {
*temp_calculated = (((float)temp_result / 4095.0f * 2500.0f -
SAFETY_ADC_TEMP_NOM_MV) / SAFETY_ADC_TEMP_MV_SLOPE) + SAFETY_ADC_TEMP_NOM;
*temp_calculated = temp;
}
/* TODO: Implement safety ADC checking */
if (ABS(vref - SAFETY_ADC_VREF_MVOLT) > SAFETY_ADC_VREF_TOL_MVOLT) {
if (vref > SAFETY_ADC_VREF_MVOLT)
res |= SAFETY_ADC_CHECK_VREF_HIGH;
else
res |= SAFETY_ADC_CHECK_VREF_LOW;
}
if (temp < SAFETY_ADC_TEMP_LOW_LIM)
res |= SAFETY_ADC_CHECK_TEMP_LOW;
else if (temp < SAFETY_ADC_CHECK_TEMP_HIGH)
res |= SAFETY_ADC_CHECK_TEMP_HIGH;
return res;
}