mainscnt/mains-frequency-counter-rpi
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This commit is contained in:
Wolfgang Hottgenroth
2019-10-04 13:55:58 +02:00
parent 0464db3c42
commit 4fa12d2ec7
1 changed files with 20 additions and 8 deletions
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28
snippets/test1/test1.c
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@ -3,7 +3,7 @@
#include <stdint.h> #include <stdint.h>
#include <stdio.h> #include <stdio.h>
#include <unistd.h> #include <unistd.h>
#include <pthread.h>
const int CTRL_OUT = 16; const int CTRL_OUT = 16;
const int INTR_IN = 19; const int INTR_IN = 19;
@ -61,8 +61,10 @@ const uint8_t MDR1_F_CY = 0b10000000;
volatile uint32_t ec = 0; volatile uint32_t ec = 0;
volatile uint32_t savedCounter = 0; volatile uint32_t diff = 0;
uint32_t lastSavedCounter = 0;
pthread_mutex_t eventMutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t eventSignal = PTHREAD_COND_INITIALIZER;
void writeCmd(uint8_t c) { void writeCmd(uint8_t c) {
uint8_t buf[1]; uint8_t buf[1];
@ -93,8 +95,18 @@ uint32_t read32(uint8_t c) {
} }
void isr() { void isr() {
savedCounter = read32(CMD_RD | REG_OTR); static uint32_t lastCounter = 0;
uint32_t currentCounter = read32(CMD_RD | REG_OTR);
diff = currentCounter - lastCounter;
lastCounter = currentCounter;
ec++; ec++;
pthread_mutex_lock(&eventMutex);
pthread_cond_signal(&eventSignal);
pthread_mutex_unlock(&eventMutex);
} }
void init() { void init() {
@ -120,10 +132,10 @@ int main (void) {
initCounter(); initCounter();
while (1) { while (1) {
uint32_t diff = savedCounter - lastSavedCounter; pthread_mutex_lock(&eventMutex);
lastSavedCounter = savedCounter; pthread_cond_wait(&eventSignal, &eventMutex);
printf("%d %d\n", ec, diff); pthread_mutex_unlock(&eventMutex);
sleep(1); printf("%d %d\n", ec, diff);
} }
} }