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New pulse per second example synced to wall time.

This commit is contained in:
joan2937 2020-08-16 21:27:04 +01:00
parent a2997c58a3
commit 9a22f2d64b
3 changed files with 6 additions and 1 deletions
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DOC/dbase/pigpio.sqlite
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DOC/src/defs/examples.def
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@ -52,7 +52,7 @@ Examples of C pigpio programs.
If your program is called foobar.c then build with If your program is called foobar.c then build with
gcc -Wall -pthread -o foobar foobar.c -lpigpio -lrt gcc -Wall -o foobar foobar.c -lpigpio
?3|freq_count_1|2014-08-20|Frequency Counter 1 ?3|freq_count_1|2014-08-20|Frequency Counter 1
A program showing how to use the <a href="cif.html#gpioSetAlertFunc">gpioSetAlertFunc</a> function to set a callback for GPIO state changes. A frequency count is generated for each monitored GPIO (frequencies up to 500kHz with a sample rate of 1&mu;s). A program showing how to use the <a href="cif.html#gpioSetAlertFunc">gpioSetAlertFunc</a> function to set a callback for GPIO state changes. A frequency count is generated for each monitored GPIO (frequencies up to 500kHz with a sample rate of 1&mu;s).
@ -75,6 +75,9 @@ A program to display readings from the (I2C) PCF8591.
?3|pot_cap_charge_c|2014-03-14|Pot + Capacitor Recharge Timing ?3|pot_cap_charge_c|2014-03-14|Pot + Capacitor Recharge Timing
Function to time capacitor charging (through a resistance). The time can be used to estimate the resistance. Function to time capacitor charging (through a resistance). The time can be used to estimate the resistance.
?3|pps_c|2020-07-28|Pulse Per Second generator
A program to generate a pulse on a GPIO every x seconds (1<=x<=60). The pulse is synced with the wall time second boundary.
?3|rotary_encoder_c|2015-10-03|Rotary Encoder ?3|rotary_encoder_c|2015-10-03|Rotary Encoder
Function to decode a mechanical rotary encoder. Function to decode a mechanical rotary encoder.

2
pigpio.c
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@ -13221,6 +13221,8 @@ int fileApprove(char *filename)
buffer[0] = 0; buffer[0] = 0;
match[0] = 0; match[0] = 0;
if (myPathBad(filename)) return PI_FILE_NONE;
f = fopen("/opt/pigpio/access", "r"); f = fopen("/opt/pigpio/access", "r");
if (!f) return PI_FILE_NONE; if (!f) return PI_FILE_NONE;