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Code Issues Releases Activity

Added a bunch of sanity checking

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This commit is contained in:
fordsfords
2016-06-26 14:28:06 -05:00
parent 5ad81066b2
commit 093922567a
5 changed files with 95 additions and 70 deletions
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46
source/c_pwm.c
View File

@ -79,7 +79,7 @@ int initialize_pwm(void)
{
if (!pwm_initialized) {
int fd, len;
char str_gpio[2];
char str_gpio[80];
// Per https://github.com/NextThingCo/CHIP-linux/pull/4
// we need to export 0 here to enable pwm0
int gpio = 0;
@ -88,7 +88,7 @@ int initialize_pwm(void)
{
return -1;
}
len = snprintf(str_gpio, sizeof(str_gpio), "%d", gpio);
len = snprintf(str_gpio, sizeof(str_gpio), "%d", gpio); BUF2SMALL(str_gpio);
ssize_t s = write(fd, str_gpio, len); ASSRT(s == len);
close(fd);
@ -101,7 +101,7 @@ int initialize_pwm(void)
int pwm_set_frequency(const char *key, float freq) {
int len;
char buffer[20];
char buffer[80];
unsigned long period_ns;
struct pwm_exp *pwm;
@ -119,7 +119,7 @@ int pwm_set_frequency(const char *key, float freq) {
if (period_ns != pwm->period_ns) {
pwm->period_ns = period_ns;
len = snprintf(buffer, sizeof(buffer), "%lu", period_ns);
len = snprintf(buffer, sizeof(buffer), "%lu", period_ns); BUF2SMALL(buffer);
ssize_t s = write(pwm->period_fd, buffer, len); ASSRT(s == len);
}
@ -128,7 +128,7 @@ int pwm_set_frequency(const char *key, float freq) {
int pwm_set_polarity(const char *key, int polarity) {
int len;
char buffer[9]; /* allow room for trailing NUL byte */
char buffer[80];
struct pwm_exp *pwm;
pwm = lookup_exported_pwm(key);
@ -142,11 +142,11 @@ int pwm_set_polarity(const char *key, int polarity) {
}
if (polarity == 0) {
len = snprintf(buffer, sizeof(buffer), "%s", "normal");
len = snprintf(buffer, sizeof(buffer), "%s", "normal"); BUF2SMALL(buffer);
}
else
{
len = snprintf(buffer, sizeof(buffer), "%s", "inverted");
len = snprintf(buffer, sizeof(buffer), "%s", "inverted"); BUF2SMALL(buffer);
}
ssize_t s = write(pwm->polarity_fd, buffer, len); ASSRT(s == len);
@ -155,7 +155,7 @@ int pwm_set_polarity(const char *key, int polarity) {
int pwm_set_duty_cycle(const char *key, float duty) {
int len;
char buffer[20];
char buffer[80];
struct pwm_exp *pwm;
if (duty < 0.0 || duty > 100.0)
@ -169,7 +169,7 @@ int pwm_set_duty_cycle(const char *key, float duty) {
pwm->duty = (unsigned long)(pwm->period_ns * (duty / 100.0));
len = snprintf(buffer, sizeof(buffer), "%lu", pwm->duty);
len = snprintf(buffer, sizeof(buffer), "%lu", pwm->duty); BUF2SMALL(buffer);
ssize_t s = write(pwm->duty_fd, buffer, len); ASSRT(s == len);
return 0;
@ -178,7 +178,7 @@ int pwm_set_duty_cycle(const char *key, float duty) {
int pwm_set_enable(const char *key, int enable)
{
int len;
char buffer[20];
char buffer[80];
struct pwm_exp *pwm;
if (enable != 0 || enable != 1)
@ -192,7 +192,7 @@ int pwm_set_enable(const char *key, int enable)
pwm->enable = enable;
len = snprintf(buffer, sizeof(buffer), "%d", pwm->enable);
len = snprintf(buffer, sizeof(buffer), "%d", pwm->enable); BUF2SMALL(buffer);
ssize_t s = write(pwm->enable_fd, buffer, len); ASSRT(s == len);
return 0;
@ -200,11 +200,11 @@ int pwm_set_enable(const char *key, int enable)
int pwm_start(const char *key, float duty, float freq, int polarity)
{
char pwm_base_path[45];
char period_path[50];
char duty_path[50];
char enable_path[50];
char polarity_path[55];
char pwm_base_path[80];
char period_path[80];
char duty_path[80];
char enable_path[80];
char polarity_path[80];
int period_fd, duty_fd, polarity_fd, enable_fd;
struct pwm_exp *new_pwm, *pwm;
@ -213,13 +213,13 @@ int pwm_start(const char *key, float duty, float freq, int polarity)
}
//setup the pwm base path, the chip only has one pwm
snprintf(pwm_base_path, sizeof(pwm_base_path), "/sys/class/pwm/pwmchip0/pwm%d", 0);
snprintf(pwm_base_path, sizeof(pwm_base_path), "/sys/class/pwm/pwmchip0/pwm%d", 0); BUF2SMALL(pwm_base_path);
//create the path for the period and duty
snprintf(enable_path, sizeof(enable_path), "%s/enable", pwm_base_path);
snprintf(period_path, sizeof(period_path), "%s/period", pwm_base_path);
snprintf(duty_path, sizeof(duty_path), "%s/duty_cycle", pwm_base_path);
snprintf(polarity_path, sizeof(polarity_path), "%s/polarity", pwm_base_path);
snprintf(enable_path, sizeof(enable_path), "%s/enable", pwm_base_path); BUF2SMALL(enable_path);
snprintf(period_path, sizeof(period_path), "%s/period", pwm_base_path); BUF2SMALL(period_path);
snprintf(duty_path, sizeof(duty_path), "%s/duty_cycle", pwm_base_path); BUF2SMALL(duty_path);
snprintf(polarity_path, sizeof(polarity_path), "%s/polarity", pwm_base_path); BUF2SMALL(polarity_path);
//add period and duty fd to pwm list
if ((enable_fd = open(enable_path, O_RDWR)) < 0)
@ -285,7 +285,7 @@ int pwm_disable(const char *key)
struct pwm_exp *pwm, *temp, *prev_pwm = NULL;
int fd, len;
char str_gpio[2];
char str_gpio[80];
// Per https://github.com/NextThingCo/CHIP-linux/pull/4
// we need to export 0 here to enable pwm0
int gpio = 0;
@ -300,7 +300,7 @@ int pwm_disable(const char *key)
{
return -1;
}
len = snprintf(str_gpio, sizeof(str_gpio), "%d", gpio);
len = snprintf(str_gpio, sizeof(str_gpio), "%d", gpio); BUF2SMALL(str_gpio);
ssize_t s = write(fd, str_gpio, len); ASSRT(s == len);
close(fd);

39
source/common.c
View File

@ -49,20 +49,6 @@ SOFTWARE.
int setup_error = 0;
int module_setup = 0;
// In the pins_t structure, the "base_method" field tells how
// the "gpio" field should be interpreted.
#define BASE_METHOD_AS_IS 1 /* use the gpio value directly */
#define BASE_METHOD_XIO 2 /* add the gpio value to the XIO base */
typedef struct pins_t {
const char *name;
const char *key;
int gpio; /* port number to use under /sys/class/gpio */
int base_method; /* modifier for port number; see BASE_METHOD_... */
int pwm_mux_mode;
int ain;
} pins_t;
// I have no idea if this table is correct, we shall see - Robert Wolterman
pins_t pins_info[] = {
{ "GND", "U13_1", 0, BASE_METHOD_AS_IS, -1, -1},
@ -158,11 +144,12 @@ pins_t pins_info[] = {
// http://stackoverflow.com/questions/612097/how-can-i-get-the-list-of-files-in-a-directory-using-c-or-c
#define GPIO_PATH "/sys/class/gpio"
#define EXPANDER "pcf8574a\n"
int num_get_xio_base = 0; /* for self-test purposes */
int get_xio_base(void)
{
char label_file[80];
char label_file[FILENAME_BUFFER_SIZE];
FILE *label_fp;
char base_file[80];
char base_file[FILENAME_BUFFER_SIZE];
FILE *base_fp;
char input_line[80];
// Makes use of static variable xio_base_address to maintain state between
@ -182,22 +169,20 @@ int get_xio_base(void)
if (strcmp(".",ent->d_name) == 0 || strcmp("..",ent->d_name) == 0) {
continue; /* skip "." and ".." entries */
}
//printf ("%s\n", ent->d_name);
sprintf(label_file, "%s/%s/label", GPIO_PATH, ent->d_name);
//printf("label_file='%s'\n", label_file);
snprintf(label_file, sizeof(label_file), "%s/%s/label", GPIO_PATH, ent->d_name); BUF2SMALL(label_file);
label_fp = fopen(label_file, "r");
if (label_fp != NULL) {
char *s = fgets(input_line, sizeof(input_line), label_fp);
ASSRT(s == input_line && strlen(input_line) < sizeof(input_line)-1);
char *s = fgets(input_line, sizeof(input_line), label_fp); BUF2SMALL(input_line); ASSRT(s);
fclose(label_fp);
if (strcmp(input_line, EXPANDER) == 0) {
/* Found the expander, get the contents of base */
sprintf(base_file, "%s/%s/base", GPIO_PATH, ent->d_name);
snprintf(base_file, sizeof(base_file), "%s/%s/base", GPIO_PATH, ent->d_name); BUF2SMALL(base_file);
base_fp = fopen(base_file, "r"); ASSRT(base_fp != NULL);
s = fgets(input_line, sizeof(input_line), base_fp);
ASSRT(s == input_line && strlen(input_line) < sizeof(input_line)-1);
fclose(base_fp);
xio_base_address = atoi(input_line); /* remember the result */
num_get_xio_base++; /* for self-test purposes */
}
} /* if label file is open */
} /* if isdir */
@ -411,15 +396,15 @@ int build_path(const char *partial_path, const char *prefix, char *full_path, si
int get_spi_bus_path_number(unsigned int spi)
{
char path[80];
char ocp_dir[30];
char path[FILENAME_BUFFER_SIZE];
char ocp_dir[FILENAME_BUFFER_SIZE];
build_path("/sys/devices", "ocp", ocp_dir, sizeof(ocp_dir));
build_path("/sys/devices", "ocp", ocp_dir, sizeof(ocp_dir)); BUF2SMALL(ocp_dir);
if (spi == 0) {
snprintf(path, sizeof(path), "%s/48030000.spi/spi_master/spi1", ocp_dir);
snprintf(path, sizeof(path), "%s/48030000.spi/spi_master/spi1", ocp_dir); BUF2SMALL(path);
} else {
snprintf(path, sizeof(path), "%s/481a0000.spi/spi_master/spi1", ocp_dir);
snprintf(path, sizeof(path), "%s/481a0000.spi/spi_master/spi1", ocp_dir); BUF2SMALL(path);
}
DIR* dir = opendir(path);

27
source/common.h
View File

@ -36,10 +36,6 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#define MODE_UNKNOWN -1
#define BOARD 10
#define BCM 11
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
// See http://blog.geeky-boy.com/2016/06/of-compiler-warnings-and-asserts-in.html
@ -50,6 +46,29 @@ SOFTWARE.
abort(); \
} } while (0)
// See http://blog.geeky-boy.com/2016/06/snprintf-bug-detector-or-bug-preventer.html
#define BUF2SMALL(b) do {\
ASSRT(strnlen(b, sizeof(b)) < sizeof(b)-1);\
} while (0)
#define MODE_UNKNOWN -1
#define BOARD 10
#define BCM 11
// In the pins_t structure, the "base_method" field tells how
// the "gpio" field should be interpreted.
#define BASE_METHOD_AS_IS 1 /* use the gpio value directly */
#define BASE_METHOD_XIO 2 /* add the gpio value to the XIO base */
typedef struct pins_t {
const char *name;
const char *key;
int gpio; /* port number to use under /sys/class/gpio */
int base_method; /* modifier for port number; see BASE_METHOD_... */
int pwm_mux_mode;
int ain;
} pins_t;
#define FILENAME_BUFFER_SIZE 128
int setup_error;

28
source/event_gpio.c
View File

@ -84,14 +84,14 @@ int epfd = -1;
int gpio_export(unsigned int gpio)
{
int fd, len;
char str_gpio[10];
char str_gpio[16];
struct gpio_exp *new_gpio, *g;
if ((fd = open("/sys/class/gpio/export", O_WRONLY)) < 0)
{
return -1;
}
len = snprintf(str_gpio, sizeof(str_gpio), "%d", gpio);
len = snprintf(str_gpio, sizeof(str_gpio), "%d", gpio); BUF2SMALL(str_gpio);
ssize_t s = write(fd, str_gpio, len); ASSRT(s == len);
close(fd);
@ -181,7 +181,7 @@ int open_value_file(unsigned int gpio)
char filename[MAX_FILENAME];
// create file descriptor of value file
snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/value", gpio);
snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/value", gpio); BUF2SMALL(filename);
if ((fd = open(filename, O_RDONLY | O_NONBLOCK)) < 0)
return -1;
@ -192,7 +192,7 @@ int open_value_file(unsigned int gpio)
int gpio_unexport(unsigned int gpio)
{
int fd, len;
char str_gpio[10];
char str_gpio[16];
struct gpio_exp *g, *temp, *prev_g = NULL;
close_value_fd(gpio);
@ -200,7 +200,7 @@ int gpio_unexport(unsigned int gpio)
if ((fd = open("/sys/class/gpio/unexport", O_WRONLY)) < 0)
return -1;
len = snprintf(str_gpio, sizeof(str_gpio), "%d", gpio);
len = snprintf(str_gpio, sizeof(str_gpio), "%d", gpio); BUF2SMALL(str_gpio);
ssize_t s = write(fd, str_gpio, len); ASSRT(s == len);
close(fd);
@ -228,10 +228,10 @@ int gpio_unexport(unsigned int gpio)
int gpio_set_direction(unsigned int gpio, unsigned int in_flag)
{
int fd;
char filename[40];
char direction[10] = { 0 };
char filename[MAX_FILENAME];
char direction[16] = { 0 };
snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/direction", gpio);
snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/direction", gpio); BUF2SMALL(filename);
if ((fd = open(filename, O_WRONLY)) < 0)
return -1;
@ -250,9 +250,9 @@ int gpio_get_direction(unsigned int gpio, unsigned int *value)
{
int fd;
char direction[4] = { 0 };
char filename[40];
char filename[MAX_FILENAME];
snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/direction", gpio);
snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/direction", gpio); BUF2SMALL(filename);
if ((fd = open(filename, O_RDONLY | O_NONBLOCK)) < 0)
return -1;
@ -272,9 +272,9 @@ int gpio_set_value(unsigned int gpio, unsigned int value)
{
int fd;
char filename[MAX_FILENAME];
char vstr[10];
char vstr[16];
snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/value", gpio);
snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/value", gpio); BUF2SMALL(filename);
if ((fd = open(filename, O_WRONLY)) < 0)
return -1;
@ -316,9 +316,9 @@ int gpio_get_value(unsigned int gpio, unsigned int *value)
int gpio_set_edge(unsigned int gpio, unsigned int edge)
{
int fd;
char filename[40];
char filename[MAX_FILENAME];
snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/edge", gpio);
snprintf(filename, sizeof(filename), "/sys/class/gpio/gpio%d/edge", gpio); BUF2SMALL(filename);
if ((fd = open(filename, O_WRONLY)) < 0)
return -1;

25
source/py_gpio.c
View File

@ -446,7 +446,7 @@ static PyObject *py_wait_for_edge(PyObject *self, PyObject *args)
unsigned int gpio;
int edge, result;
char *channel;
char error[30];
char error[81];
if (!PyArg_ParseTuple(args, "si", &channel, &edge))
return NULL;
@ -487,7 +487,7 @@ static PyObject *py_wait_for_edge(PyObject *self, PyObject *args)
PyErr_SetString(PyExc_RuntimeError, "Edge detection events already enabled for this GPIO channel");
return NULL;
} else {
sprintf(error, "Error #%d waiting for edge", result);
snprintf(error, sizeof(error), "Error #%d waiting for edge", result); BUF2SMALL(error);
PyErr_SetString(PyExc_RuntimeError, error);
return NULL;
}
@ -536,6 +536,26 @@ static PyObject *py_setwarnings(PyObject *self, PyObject *args)
Py_RETURN_NONE;
}
// Internal unit tests
extern int num_get_xio_base;
static PyObject *py_selftest(PyObject *self, PyObject *args)
{
int input;
if (!PyArg_ParseTuple(args, "i", &input))
return NULL;
ASSRT(num_get_xio_base == 0);
int base = get_xio_base(); ASSRT(base > 0 && base < 1024);
ASSRT(num_get_xio_base == 1);
int second_base = get_xio_base(); ASSRT(second_base == base);
ASSRT(num_get_xio_base == 1); /* make sure it didn't do the full calc a second time. */
int value = input;
PyObject *py_value = Py_BuildValue("i", value);
return py_value;
}
static const char moduledocstring[] = "GPIO functionality of a CHIP using Python";
PyMethodDef gpio_methods[] = {
@ -550,6 +570,7 @@ PyMethodDef gpio_methods[] = {
{"wait_for_edge", py_wait_for_edge, METH_VARARGS, "Wait for an edge.\ngpio - gpio channel\nedge - RISING, FALLING or BOTH"},
{"gpio_function", py_gpio_function, METH_VARARGS, "Return the current GPIO function (IN, OUT, ALT0)\ngpio - gpio channel"},
{"setwarnings", py_setwarnings, METH_VARARGS, "Enable or disable warning messages"},
{"selftest", py_selftest, METH_VARARGS, "Internal unit tests"},
{NULL, NULL, 0, NULL}
};