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added error string info (a la gpio) to the pwm code for #56

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Robert Wolterman
2017-01-28 18:50:09 +00:00
parent 3ff79d43e3
commit 05b936ca1d
3 changed files with 80 additions and 47 deletions
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27
source/common.c
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@ -455,33 +455,6 @@ int build_path(const char *partial_path, const char *prefix, char *full_path, si
return 0;
}
int get_spi_bus_path_number(unsigned int spi)
{
char path[FILENAME_BUFFER_SIZE];
char ocp_dir[FILENAME_BUFFER_SIZE];
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); BUF2SMALL(path);
} else {
snprintf(path, sizeof(path), "%s/481a0000.spi/spi_master/spi1", ocp_dir); BUF2SMALL(path);
}
DIR* dir = opendir(path);
if (dir) {
closedir(dir);
//device is using /dev/spidev1.x
return 1;
} else if (ENOENT == errno) {
//device is using /dev/spidev2.x
return 2;
} else {
return -1;
}
}
// We do not know at compile time how many GPIOs there are, so it is not safe
// to declare per-GPIO arrays with a static size. The "dyn_int_array_*"
// functions implement a dynamic integer array which grows as needed at run