我有一个RPi4。
基于此link，我需要具有2.52的gpio版本才能在此设备上正常工作。
我已经做到了：
# cd /tmp
# wget https://project-downloads.drogon.net/wiringpi-latest.deb
# sudo dpkg -i wiringpi-latest.deb
# gpio -v
gpio version: 2.46
此外，写入GPIO无效，引导后所有端口均为逻辑1。
并且git.drogon.net不可用。
如果我需要编译依赖此库的软件，该怎么办？？
我已按照stevieb的建议克隆了this存储库。 它还有pull请求支持PI4板。
但是即使应用了该补丁，我也无法控制PI4的输出引脚：
首先获取引脚的当前状态：
# gpio readall
+-----+-----+---------+------+---+---Pi 4+--+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| | | 3.3v | | | 1 || 2 | | | 5v | | |
| 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
| 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
| 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 1 | IN | TxD | 15 | 14 |
| | | 0v | | | 9 || 10 | 1 | IN | RxD | 16 | 15 |
| 17 | 0 | GPIO. 0 | IN | 1 | 11 || 12 | 1 | IN | GPIO. 1 | 1 | 18 |
| 27 | 2 | GPIO. 2 | IN | 1 | 13 || 14 | | | 0v | | |
| 22 | 3 | GPIO. 3 | IN | 1 | 15 || 16 | 1 | IN | GPIO. 4 | 4 | 23 |
| | | 3.3v | | | 17 || 18 | 1 | ALT0 | GPIO. 5 | 5 | 24 |
| 10 | 12 | MOSI | IN | 1 | 19 || 20 | | | 0v | | |
| 9 | 13 | MISO | IN | 1 | 21 || 22 | 1 | IN | GPIO. 6 | 6 | 25 |
| 11 | 14 | SCLK | IN | 1 | 23 || 24 | 1 | ALT4 | CE0 | 10 | 8 |
| | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
| 0 | 30 | SDA.0 | IN | 1 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
| 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
| 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 1 | ALT5 | GPIO.26 | 26 | 12 |
| 13 | 23 | GPIO.23 | IN | 1 | 33 || 34 | | | 0v | | |
| 19 | 24 | GPIO.24 | IN | 1 | 35 || 36 | 1 | IN | GPIO.27 | 27 | 16 |
| 26 | 25 | GPIO.25 | IN | 1 | 37 || 38 | 1 | IN | GPIO.28 | 28 | 20 |
| | | 0v | | | 39 || 40 | 1 | IN | GPIO.29 | 29 | 21 |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+---Pi 4+--+---+------+---------+-----+-----+
然后将pin7设置为输出并检查结果：
# gpio mode 7 out
# gpio readall
+-----+-----+---------+------+---+---Pi 4+--+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| | | 3.3v | | | 1 || 2 | | | 5v | | |
| 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
| 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
| 4 | 7 | GPIO. 7 | OUT | 1 | 7 || 8 | 1 | IN | TxD | 15 | 14 |
| | | 0v | | | 9 || 10 | 1 | IN | RxD | 16 | 15 |
| 17 | 0 | GPIO. 0 | IN | 1 | 11 || 12 | 1 | IN | GPIO. 1 | 1 | 18 |
| 27 | 2 | GPIO. 2 | IN | 1 | 13 || 14 | | | 0v | | |
| 22 | 3 | GPIO. 3 | IN | 1 | 15 || 16 | 1 | IN | GPIO. 4 | 4 | 23 |
| | | 3.3v | | | 17 || 18 | 1 | ALT0 | GPIO. 5 | 5 | 24 |
| 10 | 12 | MOSI | IN | 1 | 19 || 20 | | | 0v | | |
| 9 | 13 | MISO | IN | 1 | 21 || 22 | 1 | IN | GPIO. 6 | 6 | 25 |
| 11 | 14 | SCLK | IN | 1 | 23 || 24 | 1 | ALT4 | CE0 | 10 | 8 |
| | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
| 0 | 30 | SDA.0 | IN | 1 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
| 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
| 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 1 | ALT5 | GPIO.26 | 26 | 12 |
| 13 | 23 | GPIO.23 | IN | 1 | 33 || 34 | | | 0v | | |
| 19 | 24 | GPIO.24 | IN | 1 | 35 || 36 | 1 | IN | GPIO.27 | 27 | 16 |
| 26 | 25 | GPIO.25 | IN | 1 | 37 || 38 | 1 | IN | GPIO.28 | 28 | 20 |
| | | 0v | | | 39 || 40 | 1 | IN | GPIO.29 | 29 | 21 |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+---Pi 4+--+---+------+---------+-----+-----+
然后将0写入pin7并检查结果：
# gpio write 7 0
# gpio readall
+-----+-----+---------+------+---+---Pi 4+--+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| | | 3.3v | | | 1 || 2 | | | 5v | | |
| 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
| 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
| 4 | 7 | GPIO. 7 | OUT | 1 | 7 || 8 | 1 | IN | TxD | 15 | 14 |
| | | 0v | | | 9 || 10 | 1 | IN | RxD | 16 | 15 |
| 17 | 0 | GPIO. 0 | IN | 1 | 11 || 12 | 1 | IN | GPIO. 1 | 1 | 18 |
| 27 | 2 | GPIO. 2 | IN | 1 | 13 || 14 | | | 0v | | |
| 22 | 3 | GPIO. 3 | IN | 1 | 15 || 16 | 1 | IN | GPIO. 4 | 4 | 23 |
| | | 3.3v | | | 17 || 18 | 1 | ALT0 | GPIO. 5 | 5 | 24 |
| 10 | 12 | MOSI | IN | 1 | 19 || 20 | | | 0v | | |
| 9 | 13 | MISO | IN | 1 | 21 || 22 | 1 | IN | GPIO. 6 | 6 | 25 |
| 11 | 14 | SCLK | IN | 1 | 23 || 24 | 1 | ALT4 | CE0 | 10 | 8 |
| | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
| 0 | 30 | SDA.0 | IN | 1 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
| 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
| 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 1 | ALT5 | GPIO.26 | 26 | 12 |
| 13 | 23 | GPIO.23 | IN | 1 | 33 || 34 | | | 0v | | |
| 19 | 24 | GPIO.24 | IN | 1 | 35 || 36 | 1 | IN | GPIO.27 | 27 | 16 |
| 26 | 25 | GPIO.25 | IN | 1 | 37 || 38 | 1 | IN | GPIO.28 | 28 | 20 |
| | | 0v | | | 39 || 40 | 1 | IN | GPIO.29 | 29 | 21 |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+---Pi 4+--+---+------+---------+-----+-----+
您可以看到每个引脚都处于逻辑状态1。用电压表对其进行测量也可以确认这一点。 有谁知道如何修改connectionPiPi库以能够正确设置输出值？
谢谢
答案 0 :(得分：0)
Gordon abandoned前一段时间是connectionPi的开放源代码端，并且完全删除了对其的访问。
自那时以来，我已经多次与他联系，但尚未收到任何回复。我什至要求获得对他所做更改的付费访问权，以便我自己的包装器软件可以继续工作。
显然，您必须有权访问旧版本的源代码并自行对其进行修改。 v2.46的this 'fork'可以作为更改的基础。
答案 1 :(得分：0)
按照戈登在this link中所说的做，它再次起作用：
cd /tmp
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
答案 2 :(得分：0)
Raspberry 4的connectionPi版本2.52（以及等效的GPIO shell命令）有很大帮助，但不能正确实现pullUpDnControl（）。结果，输入引脚无法设置为使用内部上拉/下拉电阻。
使用GPIO / BCM引脚26进行了测试
sudo raspi-gpio get | grep "GPIO 26"
shell命令。
试图通过以下方式设置上拉/下拉：
pullUpDnControl(26, PUD_DOWN);
和
pullUpDnControl(26, PUD_UP);
在
下wiringPiSetupGpio();
在C中进行WiringPi设置。
使用“ raspi-gpio” shell命令未报告更改。
由于这个问题对我来说是静态安装失败，所以我没有完全放弃connectionPi，而是实施了一个解决方案。由于我无法使等效的GPIO shell命令正常工作（出于相同的原因（因为它是connectioningPi套件的一部分）），但是Python得以维护并正常工作，因此我将等效的Python引脚设置代码嵌入C中，并认为它可能对某人有用（使connectionPi通过Raspberry Pi 4正常工作）。
对于那些可能会觉得有用的人，这里是测试代码。 3-LED Cylon。 LED的一端接地（电阻缓冲（200OHM）），另一端则连接到不同的引脚（16、20和21）。一端接地，另一端26号。按下开关时，Cylon显示屏会变成3个LED的眩光，直到释放开关为止。引脚号在BCM系列中，由外壳程序命令“ gpio readall”显示。
/* 3-LED Cylon testbed. Embedded Python GPIO pin setup code
* as a workaround to wiringPi v2.52 pullUpDnControl() bug.
* Send setup code to Python's stdin, as a short-lived child process.
* Sends Python equivalent to pullUpDnControl(26, PUD_UP); keeping
* the pin number (26) as a C #define.
* Use as needed.
* Alen Shapiro June 2020
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <wiringPi.h>
/* on */
#define FIX_GPIO 1 // replace pullUpDnControl on Raspberry Pi 4. Use Python as GPIO in the shell fails too */
#define MICRO_SLEEP (100*1000) /* 100 microseconds */
#define LOW 0
#define HIGH 1
/* BCM: gpio -g // wPi // Phys: gpio -1 */
#define LED1 16 // 27 // 36
#define LED2 20 // 28 // 38
#define LED3 21 // 29 // 40
#define PRESS 26 // 25 // 37
#if defined(FIX_GPIO)
struct fixGPIO {
char *pyLine;
int pin;
} fixGPIO[] = { // feed a three-argument fprintf() to popen() (so #define pins can be passed (one per line))
{ "import RPi.GPIO as GPIO\n", 0},
{ "GPIO.setmode(GPIO.BCM)\n", 0},
{ "GPIO.setwarnings(False)\n", 0},
{ "GPIO.setup(%d, GPIO.IN, pull_up_down=GPIO.PUD_UP)\n", PRESS},
{ (char *)NULL, 0}
};
FILE *pythonStream;
#endif /* defined(FIX_GPIO) */
int
main(void) {
int i;
wiringPiSetupGpio();
//wiringPiSetupPhys();
printf("Raspberry Pi 4 - direct Cylon Test\n");
pinMode(LED1, OUTPUT);
pinMode(LED2, OUTPUT);
pinMode(LED3, OUTPUT);
pinMode(PRESS, INPUT);
#if defined(FIX_GPIO)
if((pythonStream=popen("python", "w")) == NULL) {
fprintf(stderr, "Can't run python to set pin mode\n");
exit(1);
}
for(i=0 ; fixGPIO[i].pyLine ; i++)
fprintf(pythonStream, fixGPIO[i].pyLine, fixGPIO[i].pin);
pclose(pythonStream);
#else /* defined(FIX_GPIO) */
pullUpDnControl(PRESS, PUD_UP); /* fails on RPi-4 (as does shell GPIO) */
#endif /* defined(FIX_GPIO) */
while(1) {
if(digitalRead(PRESS) == LOW) { // Glaring Cylon
digitalWrite(LED1, HIGH);
digitalWrite(LED2, HIGH);
digitalWrite(LED3, HIGH);
usleep(MICRO_SLEEP);
}
else { // Happy Cylon
digitalWrite(LED1, HIGH);
digitalWrite(LED2, LOW);
digitalWrite(LED3, LOW);
usleep(MICRO_SLEEP);
digitalWrite(LED1, LOW);
digitalWrite(LED2, HIGH);
//digitalWrite(LED3, LOW);
usleep(MICRO_SLEEP);
//digitalWrite(LED1, LOW);
digitalWrite(LED2, LOW);
digitalWrite(LED3, HIGH);
usleep(MICRO_SLEEP);
//digitalWrite(LED1, LOW);
digitalWrite(LED2, HIGH);
digitalWrite(LED3, LOW);
usleep(MICRO_SLEEP);
}
}
}
使用此Makefile编译：
CC=gcc
CLIBS= -lwiringPi
cylon: cylon.o
$(CC) -o cylon cylon.o $(CLIBS)
下面是运行中的Cylon测试台的简短实况照片，请忽略仅用于监控GPIO引脚电压的Arduino（感谢加拿大的John）：
ASIDE：Gordon ...很抱歉，您被高斯曲线的下端（真是一条尾巴，老实说）所吸引，希望您能从另一端走出来完好无损。
答案 3 :(得分：0)
虽然 WiringPi 已停产，但有一个非官方补丁（开源很难杀死，其他人会继续）。
经过测试，应用后 GPIO 在我的 RaspberryPi4 上运行良好。
diff -ruN wiringPi/wiringPi.c wiringPi/wiringPi.c
--- wiringPi/wiringPi.c
+++ wiringPi/wiringPi.c
@@ -215,6 +215,7 @@ volatile unsigned int *_wiringPiTimerIrqRaw ;
#define GPIO_PERI_BASE_OLD 0x20000000
#define GPIO_PERI_BASE_NEW 0x3F000000
+#define GPIO_PERI_BASE_RP4 0xFE000000
static volatile unsigned int piGpioBase = 0 ;
@@ -547,6 +548,10 @@ static uint8_t gpioToPUDCLK [] =
39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,
} ;
+#define PULLUPDN_OFFSET_2711_0 57
+#define PULLUPDN_OFFSET_2711_1 58
+#define PULLUPDN_OFFSET_2711_2 59
+#define PULLUPDN_OFFSET_2711_3 60
// gpioToPwmALT
// the ALT value to put a GPIO pin into PWM mode
@@ -814,7 +819,7 @@ int piGpioLayout (void)
for (c = &line [strlen (line) - 1] ; (*c == '\n') || (*c == '\r') ; --c)
*c = 0 ;
-
+
if (wiringPiDebug)
printf ("piGpioLayout: Revision string: %s\n", line) ;
@@ -883,7 +888,7 @@ int piBoardRev (void)
* So the distinction between boards that I can see is:
*
* 0000 - Error
- * 0001 - Not used
+ * 0001 - Not used
*
* Original Pi boards:
* 0002 - Model B, Rev 1, 256MB, Egoman
@@ -955,6 +960,30 @@ void piBoardId (int *model, int *rev, int *mem, int *maker, int *warranty)
if ((cpuFd = fopen ("/proc/cpuinfo", "r")) == NULL)
piGpioLayoutOops ("Unable to open /proc/cpuinfo") ;
+ char buffer[12] ;
+ const char *ranges_file = "/proc/device-tree/soc/ranges" ;
+ int info_fd = open(ranges_file, O_RDONLY) ;
+
+ if (info_fd < 0) {
+ fprintf(stderr, "cannot open: %s", ranges_file) ;
+ exit (EXIT_FAILURE) ;
+ }
+
+ ssize_t n = read(info_fd, buffer, sizeof(buffer)) ;
+ close(info_fd) ;
+
+ if (n < 8) {
+ fprintf(stderr, "cannot read base address: %s", ranges_file) ;
+ exit (EXIT_FAILURE) ;
+ }
+
+ uint32_t gpio_base = (buffer[4] << 24) + (buffer[5] << 16) + (buffer[6] << 8) + (buffer[7] << 0) ;
+
+ if (!gpio_base)
+ {
+ gpio_base = (buffer[8] << 24) + (buffer[9] << 16) + (buffer[10] << 8) + (buffer[11] << 0) ;
+ }
+
while (fgets (line, 120, cpuFd) != NULL)
if (strncmp (line, "Revision", 8) == 0)
break ;
@@ -968,7 +997,7 @@ void piBoardId (int *model, int *rev, int *mem, int *maker, int *warranty)
for (c = &line [strlen (line) - 1] ; (*c == '\n') || (*c == '\r') ; --c)
*c = 0 ;
-
+
if (wiringPiDebug)
printf ("piBoardId: Revision string: %s\n", line) ;
@@ -1007,7 +1036,7 @@ void piBoardId (int *model, int *rev, int *mem, int *maker, int *warranty)
bMfg = (revision & (0x0F << 16)) >> 16 ;
bMem = (revision & (0x07 << 20)) >> 20 ;
bWarranty = (revision & (0x03 << 24)) != 0 ;
-
+
*model = bType ;
*rev = bRev ;
*mem = bMem ;
@@ -1034,7 +1063,7 @@ void piBoardId (int *model, int *rev, int *mem, int *maker, int *warranty)
// If longer than 4, we'll assume it's been overvolted
*warranty = strlen (c) > 4 ;
-
+
// Extract last 4 characters:
c = c + strlen (c) - 4 ;
@@ -1073,8 +1102,11 @@ void piBoardId (int *model, int *rev, int *mem, int *maker, int *warranty)
else { *model = 0 ; *rev = 0 ; *mem = 0 ; *maker = 0 ; }
}
+ if (gpio_base == GPIO_PERI_BASE_RP4) {
+ *model = PI_MODEL_4;
+ }
}
-
+
/*
@@ -1205,6 +1237,10 @@ void pwmSetRange (unsigned int range)
void pwmSetClock (int divisor)
{
uint32_t pwm_control ;
+
+ if(piGpioBase == GPIO_PERI_BASE_RP4) {
+ divisor = 540*divisor/192;
+ }
divisor &= 4095 ;
if ((wiringPiMode == WPI_MODE_PINS) || (wiringPiMode == WPI_MODE_PHYS) || (wiringPiMode == WPI_MODE_GPIO))
@@ -1260,7 +1296,7 @@ void gpioClockSet (int pin, int freq)
pin = physToGpio [pin] ;
else if (wiringPiMode != WPI_MODE_GPIO)
return ;
-
+
divi = 19200000 / freq ;
divr = 19200000 % freq ;
divf = (int)((double)divr * 4096.0 / 19200000.0) ;
@@ -1504,11 +1540,31 @@ void pullUpDnControl (int pin, int pud)
else if (wiringPiMode != WPI_MODE_GPIO)
return ;
- *(gpio + GPPUD) = pud & 3 ; delayMicroseconds (5) ;
- *(gpio + gpioToPUDCLK [pin]) = 1 << (pin & 31) ; delayMicroseconds (5) ;
-
- *(gpio + GPPUD) = 0 ; delayMicroseconds (5) ;
- *(gpio + gpioToPUDCLK [pin]) = 0 ; delayMicroseconds (5) ;
+ // Check GPIO register
+ int is2711 = *(gpio + PULLUPDN_OFFSET_2711_3) != 0x6770696f;
+ if(is2711) {
+ // Pi 4 Pull-up/down method
+ int pullreg = PULLUPDN_OFFSET_2711_0 + (pin >> 4);
+ int pullshift = (pin & 0xf) << 1;
+ unsigned int pullbits;
+ unsigned int pull = 0; // Turn PUD off by default
+ if (pud == PUD_UP) {
+ pull = 1;
+ } else if (pud == PUD_DOWN) {
+ pull = 2;
+ }
+ pullbits = *(gpio + pullreg);
+ pullbits &= ~(3 << pullshift);
+ pullbits |= (pull << pullshift);
+ *(gpio + pullreg) = pullbits;
+ } else {
+ // Legacy Pull-up/down method
+ *(gpio + GPPUD) = pud & 3 ; delayMicroseconds (5) ;
+ *(gpio + gpioToPUDCLK [pin]) = 1 << (pin & 31) ; delayMicroseconds (5) ;
+
+ *(gpio + GPPUD) = 0 ; delayMicroseconds (5) ;
+ *(gpio + gpioToPUDCLK [pin]) = 0 ; delayMicroseconds (5) ;
+ }
}
else // Extension module
{
@@ -1680,7 +1736,7 @@ void pwmWrite (int pin, int value)
/*
* analogRead:
- * Read the analog value of a given Pin.
+ * Read the analog value of a given Pin.
* There is no on-board Pi analog hardware,
* so this needs to go to a new node.
*********************************************************************************
@@ -1699,7 +1755,7 @@ int analogRead (int pin)
/*
* analogWrite:
- * Write the analog value to the given Pin.
+ * Write the analog value to the given Pin.
* There is no on-board Pi analog hardware,
* so this needs to go to a new node.
*********************************************************************************
@@ -1748,7 +1804,7 @@ void pwmToneWrite (int pin, int freq)
* Write an 8-bit byte to the first 8 GPIO pins - try to do it as
* fast as possible.
* However it still needs 2 operations to set the bits, so any external
- * hardware must not rely on seeing a change as there will be a change
+ * hardware must not rely on seeing a change as there will be a change
* to set the outputs bits to zero, then another change to set the 1's
* Reading is just bit fiddling.
* These are wiringPi pin numbers 0..7, or BCM_GPIO pin numbers
@@ -1804,7 +1860,7 @@ unsigned int digitalReadByte (void)
data = (data << 1) | x ;
}
}
- else
+ else
{
raw = *(gpio + gpioToGPLEV [0]) ; // First bank for these pins
for (pin = 0 ; pin < 8 ; ++pin)
@@ -1861,7 +1917,7 @@ unsigned int digitalReadByte2 (void)
data = (data << 1) | x ;
}
}
- else
+ else
data = ((*(gpio + gpioToGPLEV [0])) >> 20) & 0xFF ; // First bank for these pins
return data ;
@@ -2265,6 +2321,9 @@ int wiringPiSetup (void)
case PI_MODEL_ZERO: case PI_MODEL_ZERO_W:
piGpioBase = GPIO_PERI_BASE_OLD ;
break ;
+ case PI_MODEL_4:
+ piGpioBase = GPIO_PERI_BASE_RP4 ;
+ break ;
default:
piGpioBase = GPIO_PERI_BASE_NEW ;
@@ -2273,7 +2332,7 @@ int wiringPiSetup (void)
// Open the master /dev/ memory control device
// Device strategy: December 2016:
-// Try /dev/mem. If that fails, then
+// Try /dev/mem. If that fails, then
// try /dev/gpiomem. If that fails then game over.
if ((fd = open ("/dev/mem", O_RDWR | O_SYNC | O_CLOEXEC)) < 0)
@@ -2311,13 +2370,13 @@ int wiringPiSetup (void)
pwm = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_PWM) ;
if (pwm == MAP_FAILED)
return wiringPiFailure (WPI_ALMOST, "wiringPiSetup: mmap (PWM) failed: %s\n", strerror (errno)) ;
-
+
// Clock control (needed for PWM)
clk = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_CLOCK_BASE) ;
if (clk == MAP_FAILED)
return wiringPiFailure (WPI_ALMOST, "wiringPiSetup: mmap (CLOCK) failed: %s\n", strerror (errno)) ;
-
+
// The drive pads
pads = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_PADS) ;
@@ -2437,7 +2496,7 @@ int wiringPiSetupSys (void)
// Open and scan the directory, looking for exported GPIOs, and pre-open
// the 'value' interface to speed things up for later
-
+
for (pin = 0 ; pin < 64 ; ++pin)
{
sprintf (fName, "/sys/class/gpio/gpio%d/value", pin) ;
diff -ruN wiringPi/wiringPi.h wiringPi/wiringPi.h
--- wiringPi/wiringPi.h
+++ wiringPi/wiringPi.h
@@ -100,6 +100,7 @@
#define PI_MODEL_CM3 10
#define PI_MODEL_ZERO_W 12
#define PI_MODEL_3P 13
+#define PI_MODEL_4 14
#define PI_VERSION_1 0
#define PI_VERSION_1_1 1
注意补丁应该在 Wiring-Pi 根目录内执行（在它的 wiringPi 子目录之外）。
此外，这是我在 other answer 上的 RaspberryPi.StackExchange.com 的副本，与 https://github.com/WiringPi/WiringPi 无关（尽管他们也可以自由应用此内容）。