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#250

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This commit is contained in:
mstroh76
2024-05-31 17:49:59 +02:00
parent c055adc469
commit 2a8e7fefd3
3 changed files with 141 additions and 7 deletions
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9
wiringPi/pcf8574.c
View File

@@ -1,7 +1,7 @@
/*
* pcf8574.c:
* Extend wiringPi with the PCF8574 I2C GPIO expander chip
* Copyright (c) 2013 Gordon Henderson
* Copyright (c) 2013-2024 Gordon Henderson and contributors
***********************************************************************
* This file is part of wiringPi:
* https://github.com/WiringPi/WiringPi/
@@ -33,8 +33,9 @@
/*
* myPinMode:
* The PCF8574 is an odd chip - the pins are effectively bi-directional,
* however the pins should be drven high when used as an input pin...
* The PCF8574 is a 8-Bit I/O Expander with Open-drain output.
* The pins are effectively bi-directional,
* however the pins should be driven high when used as an input pin...
* So, we're effectively copying digitalWrite...
*********************************************************************************
*/
@@ -102,7 +103,7 @@ static int myDigitalRead (struct wiringPiNodeStruct *node, int pin)
* pcf8574Setup:
* Create a new instance of a PCF8574 I2C GPIO interface. We know it
* has 8 pins, so all we need to know here is the I2C address and the
* user-defined pin base.
* user-defined pin base. Default address (A0-A3 low) is 0x20.
*********************************************************************************
*/

27
wiringPi/test/Makefile
View File

@@ -6,7 +6,9 @@ tests = wiringpi_test1_sysfs wiringpi_test2_sysfs wiringpi_test3_device_wpi wiri
xotests = wiringpi_xotest_test1_spi
all: $(tests) $(xotests)
i2ctests = wiringpi_i2c_test1_pcf8574
all: $(tests) $(xotests) $(i2ctests)
wiringpi_test1_sysfs:
${CC} ${CFLAGS} wiringpi_test1_sysfs.c -o wiringpi_test1_sysfs -lwiringPi
@@ -32,6 +34,9 @@ wiringpi_test7_version:
wiringpi_xotest_test1_spi:
${CC} ${CFLAGS} wiringpi_xotest_test1_spi.c -o wiringpi_xotest_test1_spi -lwiringPi
wiringpi_i2c_test1_pcf8574:
${CC} ${CFLAGS} wiringpi_i2c_test1_pcf8574.c -o wiringpi_i2c_test1_pcf8574 -lwiringPi
test:
@error_state=false ; \
for t in $(tests) ; do \
@@ -51,7 +56,7 @@ test:
xotest:
@error_state=false ; \
for t in $(tests) $(xotests) ; do \
echo === unit test: $${t} === ; \
echo === XO unit test: $${t} === ; \
time ./$${t} ; \
if [ $$? -ne 0 ]; then \
error_state=true ; \
@@ -64,7 +69,23 @@ xotest:
echo "\n\e[5mSTD/XO TEST SUCCESS\e[0m\n"; \
fi
i2ctest:
@error_state=false ; \
for t in $(tests) $(i2ctests) ; do \
echo === I2C unit test: $${t} === ; \
time ./$${t} ; \
if [ $$? -ne 0 ]; then \
error_state=true ; \
fi ; \
echo ; echo ; \
done
if [ "$$error_state" = true ]; then \
echo "\n\e[5mSTD/I2C TEST FAILED\e[0m\n"; \
else \
echo "\n\e[5mSTD/I2C TEST SUCCESS\e[0m\n"; \
fi
clean:
for t in $(tests) $(xotests) ; do \
for t in $(tests) $(xotests) $(i2ctests) ; do \
rm -fv $${t} ; \
done

112
wiringPi/test/wiringpi_i2c_test1_pcf8574.c Normal file
View File

@@ -0,0 +1,112 @@
// WiringPi test program: I2C functions (need PCF8574)
// Compile: gcc -Wall wiringpi_i2c_test1.c -o wiringpi_i2c_test1 -lwiringPi
#include "wpi_test.h"
#include "pcf8574.h"
#include "wiringPiI2C.h"
const int pinBase = 1020;
const int i2cAdress = 0x20;
int ShowAll() {
int in;
int value = 0;
printf("pin: 0 1 2 3 4 5 6 7\nval: ");
for (int pin=0; pin<=7; ++pin) {
in = digitalRead(pinBase + pin);
printf("%d ", in);
if(in==HIGH) { value |= (0x01<<pin); }
}
printf(" = 0x%02X\n", value);
return value;
}
void testPin(const char* msg, int fd, int pin , int value) {
printf("%s:\n", msg);
int in = digitalRead(pinBase + pin);
CheckSame("digitalRead", in, value);
int expect = HIGH==value ? (0x1<<pin) : 0;
int pinmask = 0x01<<pin;
int i2cread = wiringPiI2CRead(fd);
CheckSame("wiringPiI2CRead", i2cread & pinmask, expect);
//printf("Value = 0x%X\n",i2cread);
uint8_t i2cvalue = HIGH==value ? 0x00 : 0xFF;
int result = wiringPiI2CRawRead(fd, &i2cvalue, 1);
CheckSame("wiringPiI2CRawRead result", result, 1);
CheckSame("wiringPiI2CRawRead", i2cvalue & pinmask, expect);
//printf("Value = 0x%X\n",i2cvalue);
}
int main (void) {
int major, minor;
wiringPiVersion(&major, &minor);
printf("Testing I2C functions with PCF8574 (WiringPi %d.%d)\n",major, minor);
printf("-------------------------------------------------\n\n");
int ret = pcf8574Setup (pinBase, i2cAdress);
if (ret!=1) {
FailAndExitWithErrno("pcf8574Setup", ret);
}
int fd = wiringPiI2CSetup (i2cAdress);
if (fd<=0) {
FailAndExitWithErrno("wiringPiI2CSetup", fd);
}
CheckSame("I2C fd", fd, 4);
ShowAll();
int pin = 3;
testPin("Test pin 3 high", fd, pin , HIGH);
testPin("Test pin 4 high", fd, pin+1, HIGH);
digitalWrite(pinBase + pin, LOW);
testPin("Test pin 3 low", fd, pin , LOW);
testPin("Test pin 4 high", fd, pin+1, HIGH);
ShowAll();
digitalWrite(pinBase + pin, HIGH);
testPin("Test pin 3 high", fd, pin , HIGH);
testPin("Test pin 4 high", fd, pin+1, HIGH);
ShowAll();
printf("\nwiringPiI2CReadReg8:\n");
int i2cin, expect;
i2cin = wiringPiI2CReadReg8(fd, 0x00);
expect = ShowAll();
CheckSame("all low wiringPiI2CReadReg8", i2cin, expect);
i2cin = wiringPiI2CReadReg8(fd, 0xFF);
expect =ShowAll();
CheckSame("all high wiringPiI2CReadReg8", i2cin, expect);
printf("\nwiringPiI2CReadBlockData:\n");
uint8_t value;
int result;
value = 0xFF;
result = wiringPiI2CReadBlockData(fd, 0x00, &value, 1);
CheckSame("wiringPiI2CReadBlockData result", result, 1);
expect = ShowAll();
CheckSame("all high wiringPiI2CReadBlockData", value, expect);
printf("\n");
value = 0x00;
result = wiringPiI2CReadBlockData(fd, 0xFF, &value, 1);
CheckSame("wiringPiI2CReadBlockData result", result, 1);
expect = ShowAll();
CheckSame("all low wiringPiI2CReadBlockData", value, expect);
return UnitTestState();
}