ReiMerc/temperature-alarm
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Clean temperature code

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This commit is contained in:
Reimar 2025-03-20 08:25:46 +01:00
parent d7fc147111
commit 62ff08c654
Signed by: Reimar
GPG Key ID: 93549FA07F0AE268
3 changed files with 22 additions and 17 deletions
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6
iot/main.c
View File

@ -10,12 +10,12 @@
void *watch_temperature(void *arg) void *watch_temperature(void *arg)
{ {
init_temperature(); temperature_handle_t temp_handle = init_temperature();
get_temperature(); get_temperature(temp_handle);
while (true) { while (true) {
double temperature = get_temperature(); double temperature = get_temperature(temp_handle);
char *str = malloc(snprintf(NULL, 0, "%lf", temperature) + 1); char *str = malloc(snprintf(NULL, 0, "%lf", temperature) + 1);
sprintf(str, "%lf", temperature); sprintf(str, "%lf", temperature);

27
iot/temperature.c
View File

@ -9,6 +9,8 @@
#include <string.h> #include <string.h>
#include <sys/ioctl.h> #include <sys/ioctl.h>
#include "temperature.h"
#define MPC9808_BUS "/dev/i2c-2" #define MPC9808_BUS "/dev/i2c-2"
#define MPC9808_ADR 0x18 #define MPC9808_ADR 0x18
@ -21,14 +23,12 @@
#define DEVID_REG 0x07 #define DEVID_REG 0x07
#define RES_REG 0x08 #define RES_REG 0x08
int file;
uint8_t get_byte_in_integer(int num, int n) uint8_t get_byte_in_integer(int num, int n)
{ {
return (num >> (8*n)) & 0xff; return (num >> (8*n)) & 0xff;
} }
double get_temperature() double get_temperature(temperature_handle_t file)
{ {
double temperature; double temperature;
int32_t reg32; int32_t reg32;
@ -51,9 +51,10 @@ double get_temperature()
return temperature; return temperature;
} }
void init_temperature(void) temperature_handle_t init_temperature(void)
{ {
file = open(MPC9808_BUS, O_RDWR); int file = open(MPC9808_BUS, O_RDWR);
if (file < 0) { if (file < 0) {
fprintf(stderr, "Error opening temperature sensor device (%s): %s\n", MPC9808_BUS, strerror(errno)); fprintf(stderr, "Error opening temperature sensor device (%s): %s\n", MPC9808_BUS, strerror(errno));
exit(1); exit(1);
@ -71,24 +72,26 @@ void init_temperature(void)
// Read manufactorer ID // Read manufactorer ID
reg32 = i2c_smbus_read_word_data(file, MANID_REG); reg32 = i2c_smbus_read_word_data(file, MANID_REG);
if ( reg32 < 0 ) { if (reg32 < 0) {
fprintf(stderr, "ERROR: Read failed on i2c bus register %d - %s\n", MANID_REG,strerror(errno)); fprintf(stderr, "ERROR: Read failed on i2c bus register %d - %s\n", MANID_REG,strerror(errno));
exit(1); exit(1);
} }
if (bswap_16(reg16poi[0]) != 0x0054) { if (bswap_16(reg16poi[0]) != 0x0054) {
fprintf(stderr, "Manufactorer ID wrong is 0x%x should be 0x54\n",__bswap_16(reg16poi[0])); fprintf(stderr, "Manufactorer ID wrong is 0x%x should be 0x54\n",__bswap_16(reg16poi[0]));
exit(1); exit(1);
} }
// Read device ID and revision // Read device ID and revision
reg32 = i2c_smbus_read_word_data(file, DEVID_REG); reg32 = i2c_smbus_read_word_data(file, DEVID_REG);
if (reg32 < 0) { if (reg32 < 0) {
fprintf(stderr, "ERROR: Read failed on i2c bus register %d - %s\n", DEVID_REG,strerror(errno) ); fprintf(stderr, "ERROR: Read failed on i2c bus register %d - %s\n", DEVID_REG,strerror(errno) );
exit(1); exit(1);
} }
if (reg8poi[0] != 0x04) { if (reg8poi[0] != 0x04) {
fprintf(stderr, "Manufactorer ID OK but device ID wrong is 0x%x should be 0x4\n",reg8poi[0]); fprintf(stderr, "Manufactorer ID OK but device ID wrong is 0x%x should be 0x4\n",reg8poi[0]);
exit(1); exit(1);
} }
return file;
} }

6
iot/temperature.h
View File

@ -1,4 +1,6 @@
void init_temperature(); typedef int temperature_handle_t;
double get_temperature(); temperature_handle_t init_temperature();
double get_temperature(temperature_handle_t handle);