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added first draft of overvoltage protection by using dump load

This commit is contained in:
Lucas Pleß 2013-06-12 01:50:54 +02:00
parent b56710f04b
commit c9bc24d8a7
2 changed files with 62 additions and 36 deletions
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6
display/software/.idea/workspace.xml
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@ -2,12 +2,14 @@
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@ -80,7 +82,7 @@
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@ -519,7 +521,7 @@
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64
display/software/powerboard/src/main.c
View File

@ -22,10 +22,15 @@
#define DUMP_ON PORT_SW |= _BV(DUMPSW)
#define DUMP_OFF PORT_SW &= ~_BV(DUMPSW)
typedef enum {
generated,
consumed
} power_source;
#define OVERVOLTAGE1 144
#define OVERVOLTAGE2 150
#define OVERVOLTAGE_TIMEOUT1 20
#define OVERVOLTAGE_TIMEOUT2 20
#define CURRENT_OFFSET 511
#define CURRENT_PER_TICK 72
#define TICKS_PER_VOLTAGE 6.6
volatile uint16_t syscounter = 0;
@ -33,6 +38,10 @@ uint16_t voltage = 0;
int16_t current_in = 0;
int16_t current_out = 0;
uint16_t overvoltage_counter = 0;
uint16_t overvoltage_off_counter = 0;
void timer_init(void) {
// clock is 8MHz
TCCR1B |= _BV(WGM12) | _BV(CS11) | _BV(CS10) ; // CTC Mode for Timer 1 (16Bit) with prescale of 64
@ -47,15 +56,15 @@ void ports_init(void) {
}
void measure(void) {
voltage = adc_read_avg(AD_V, 4) / 6.6;
voltage = adc_read_avg(AD_V, 4) / TICKS_PER_VOLTAGE;
current_in = adc_read_avg(AD_I_GEN, 4);
current_in -= 510;
current_in *= 72;
current_in -= VOLTAGE_OFFSET;
current_in *= CURRENT_PER_TICK;
current_out = adc_read_avg(AD_I_LOAD, 4);
current_out -= 511;
current_out *= 72;
current_out -= VOLTAGE_OFFSET;
current_out *= CURRENT_PER_TICK;
}
uint8_t get_power(uint16_t voltage, int16_t currents) {
@ -79,6 +88,8 @@ int main(void) {
while(1) {
if((syscounter % 100) == 0) {
measure();
uart_puts_P("Voltage: ");
@ -101,19 +112,31 @@ int main(void) {
uart_puts_P("W\r\n");
if(voltage > OVERVOLTAGE1) {
overvoltage_off_counter = 0;
overvoltage_counter++;
} else {
overvoltage_counter = 0;
overvoltage_off_counter++;
}
uart_puts_P("overvoltage_counter=");
uart_puts ( itoa ( overvoltage_counter, s, 10 ) );
uart_puts_P(" overvoltage_off_counter=");
uart_puts ( itoa ( overvoltage_off_counter , s, 10 ) );
if(overvoltage_counter >= OVERVOLTAGE_TIMEOUT1) {
overvoltage_off_counter = 0;
DUMP_ON;
}
if(overvoltage_off_counter >= OVERVOLTAGE_TIMEOUT1/2) {
overvoltage_counter = 0;
DUMP_OFF;
}
wait(100);
wait(100);
wait(100);
wait(100);
//wait(100);
//wait(100);
wait(100);
wait(100);
}
}
return(0);
@ -122,6 +145,7 @@ int main(void) {
// system timer
SIGNAL(TIMER1_COMPA_vect) {
syscounter++;
syscounter %= 60000;
}