From d973d6f8e12b16c3cdd84e63e19b61187424f4ce Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Thu, 14 Mar 2024 10:06:12 +0800
Subject: [PATCH] Add AT24C EEPROM code
---
modules/sht20.c | 300 ++++++++++++++++++++++++++++++++++++++++--------------------
1 files changed, 200 insertions(+), 100 deletions(-)
diff --git a/modules/sht20.c b/modules/sht20.c
index c3aa745..477adc6 100644
--- a/modules/sht20.c
+++ b/modules/sht20.c
@@ -10,7 +10,7 @@
* ChangeLog: 1, Release initial version on "10/08/23 17:52:00"
*
* Pin connection:
- * STH20 Module Raspberry Pi Board
+ * SHT20 Raspberry Pi 40Pin
* VCC <-----> #Pin1(3.3V)
* SDA <-----> #Pin3(SDA, BCM GPIO2)
* SCL <-----> #Pin5(SCL, BCM GPIO3)
@@ -20,6 +20,7 @@
* dtoverlay=i2c1,pins_2_3
*
********************************************************************************/
+
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -53,22 +54,26 @@
MODE_RDWR, /* I2C device API use read()/write() */
};
-typedef struct sht2x_s
+typedef struct i2c_s
{
- char *dev; /* SHT20 connect I2C device, /dev/i2c-N */
- int addr; /* SHT20 7-bits slave address */
+ char *dev; /* I2C master device, /dev/i2c-N */
+ int addr; /* 7-bits slave address */
int fd; /* File description */
int mode; /* I2C device API use read/write or ioctl mode */
-} sht2x_t;
+} i2c_t;
-int sht2x_init(sht2x_t *sht2x);
-int sht2x_get_serialnumber(sht2x_t *sht2x, uint8_t *serialnumber, int size);
-int sht2x_get_temp_humidity(sht2x_t *sht2x, float *temp, float *rh);
+int sht2x_softreset(i2c_t *i2c);
+int sht2x_get_serialnumber(i2c_t *i2c, uint8_t *serialnumber, int size);
+int sht2x_get_temp_humidity(i2c_t *i2c, float *temp, float *rh);
+
+int i2c_init(i2c_t *i2c, int mode, char *i2cdev, int addr);
+int i2c_write(i2c_t *i2c, uint8_t *data, int len);
+int i2c_read(i2c_t *i2c, uint8_t *buf, int size);
+void i2c_term(i2c_t *i2c);
static inline void msleep(unsigned long ms);
-static inline void dump_buf(const char *prompt, uint8_t *buf, int size);
-static int i2c_write(sht2x_t *sht2x, uint8_t *data, int len);
-static int i2c_read(sht2x_t *sht2x, uint8_t *buf, int size);
+void print_buf(const char *prompt, uint8_t *buf, int size);
+void dump_buf(const char *prompt, char *buf, size_t len);
static inline void banner(const char *progname)
{
@@ -94,11 +99,13 @@
int main(int argc, char **argv)
{
+ char *dev="/dev/i2c-1";
+ char *progname=NULL;
+ int mode = MODE_IOCTL;
int rv;
float temp, rh;
uint8_t serialnumber[8];
- char *progname=NULL;
- sht2x_t sht2x;
+ i2c_t i2c;
struct option long_options[] = {
{"device", required_argument, NULL, 'd'},
@@ -110,21 +117,17 @@
progname = basename(argv[0]);
- memset(&sht2x, 0, sizeof(sht2x));
- sht2x.addr = SHT2X_CHIPADDR;
- sht2x.dev = "/dev/i2c-1";
-
/* Parser the command line parameters */
while ((rv = getopt_long(argc, argv, "d:m:vh", long_options, NULL)) != -1)
{
switch (rv)
{
case 'd': /* Set I2C device path: /dev/i2c-1 */
- sht2x.dev = optarg;
+ dev = optarg;
break;
case 'm': /* Set I2C API mode: 0,1 */
- sht2x.mode = atoi(optarg) ? MODE_RDWR : MODE_IOCTL;
+ mode = atoi(optarg) ? MODE_RDWR : MODE_IOCTL;
break;
case 'v': /* Get software version */
@@ -140,19 +143,25 @@
}
}
- if( sht2x_init(&sht2x) < 0 )
+ if( i2c_init(&i2c, mode, dev, SHT2X_CHIPADDR) < 0 )
+ {
+ printf("I2C master device initial failed.\n");
+ return 1;
+ }
+
+ if( sht2x_softreset(&i2c) < 0 )
{
printf("SHT2x initialize failure, maybe device not present!\n");
return 1;
}
- if( sht2x_get_serialnumber(&sht2x, serialnumber, 8) < 0)
+ if( sht2x_get_serialnumber(&i2c, serialnumber, 8) < 0)
{
printf("SHT2x get serial number failure\n");
return 3;
}
- if( sht2x_get_temp_humidity(&sht2x, &temp, &rh) < 0 )
+ if( sht2x_get_temp_humidity(&i2c, &temp, &rh) < 0 )
{
printf("SHT2x get get temperature and relative humidity failure\n");
return 3;
@@ -160,14 +169,16 @@
printf("Temperature=%lf ℃ relative humidity=%lf.\n", temp, rh);
- close(sht2x.fd);
+ i2c_term(&i2c);
+
+ return 0;
}
-int sht2x_softreset(sht2x_t *sht2x)
+int sht2x_softreset(i2c_t *i2c)
{
uint8_t buf[1];
- if( !sht2x || sht2x->fd<0 )
+ if( !i2c || i2c->fd<0 )
{
printf("%s line [%d] %s() get invalid input arguments\n", __FILE__, __LINE__, __func__ );
return -1;
@@ -175,7 +186,7 @@
/* software reset SHT2x */
buf[0] = SOFTRESET;
- if( i2c_write(sht2x, buf, 1) < 0 )
+ if( i2c_write(i2c, buf, 1) < 0 )
{
return -2;
}
@@ -185,35 +196,11 @@
return 0;
}
-int sht2x_init(sht2x_t *sht2x)
-{
- if( (sht2x->fd=open(sht2x->dev, O_RDWR)) < 0)
- {
- printf("i2c device open failed: %s\n", strerror(errno));
- return -1;
- }
-
- if( MODE_RDWR == sht2x->mode )
- {
- /* set I2C mode and SHT2x slave address */
- ioctl(sht2x->fd, I2C_TENBIT, 0); /* Not 10-bit but 7-bit mode */
- ioctl(sht2x->fd, I2C_SLAVE, SHT2X_CHIPADDR); /* set SHT2x slave address 0x40*/
- }
-
- if( sht2x_softreset(sht2x) < 0 )
- {
- printf("SHT2x softreset failure\n");
- return -2;
- }
-
- return 0;
-}
-
-int sht2x_get_temp_humidity(sht2x_t *sht2x, float *temp, float *rh)
+int sht2x_get_temp_humidity(i2c_t *i2c, float *temp, float *rh)
{
uint8_t buf[4];
- if( !sht2x || !temp || !rh || sht2x->fd<0 )
+ if( !i2c || !temp || !rh || i2c->fd<0 )
{
printf("%s line [%d] %s() get invalid input arguments\n", __FILE__, __LINE__, __func__ );
return -1;
@@ -222,35 +209,35 @@
/* send trigger temperature measure command and read the data */
memset(buf, 0, sizeof(buf));
buf[0]=TRIGGER_TEMPERATURE_NO_HOLD;
- i2c_write(sht2x, buf, 1);
+ i2c_write(i2c, buf, 1);
msleep(85); /* datasheet: typ=66, max=85 */
memset(buf, 0, sizeof(buf));
- i2c_read(sht2x, buf, 3);
- dump_buf("Temperature sample data: ", buf, 3);
+ i2c_read(i2c, buf, 3);
+ print_buf("Temperature sample data: ", buf, 3);
*temp = 175.72 * (((((int) buf[0]) << 8) + buf[1]) / 65536.0) - 46.85;
/* send trigger humidity measure command and read the data */
memset(buf, 0, sizeof(buf));
buf[0] = TRIGGER_HUMIDITY_NO_HOLD;
- i2c_write(sht2x, buf, 1);
+ i2c_write(i2c, buf, 1);
msleep(29); /* datasheet: typ=22, max=29 */
memset(buf, 0, sizeof(buf));
- i2c_read(sht2x, buf, 3);
- dump_buf("Relative humidity sample data: ", buf, 3);
+ i2c_read(i2c, buf, 3);
+ print_buf("Relative humidity sample data: ", buf, 3);
*rh = 125 * (((((int) buf[0]) << 8) + buf[1]) / 65536.0) - 6;
return 0;
}
-int sht2x_get_serialnumber(sht2x_t *sht2x, uint8_t *serialnumber, int size)
+int sht2x_get_serialnumber(i2c_t *i2c, uint8_t *serialnumber, int size)
{
uint8_t buf[4]={0x0};
- if( !sht2x || sht2x->fd<0 || !serialnumber || size!=8 )
+ if( !i2c || i2c->fd<0 || !serialnumber || size!=8 )
{
printf("%s line [%d] %s() get invalid input arguments\n", __FILE__, __LINE__, __func__ );
return -1;
@@ -260,10 +247,10 @@
memset(buf, 0, sizeof(buf));
buf[0] = 0xfa; /* command for readout on-chip memory */
buf[1] = 0x0f; /* on-chip memory address */
- i2c_write(sht2x, buf, 2);
+ i2c_write(i2c, buf, 2);
memset(buf, 0, sizeof(buf));
- i2c_read(sht2x, buf, 4);
+ i2c_read(i2c, buf, 4);
if( !buf[0] && !buf[1] && !buf[2] && !buf[3] )
{
@@ -280,24 +267,65 @@
memset(buf, 0, sizeof(buf) );
buf[0]=0xfc; /* command for readout on-chip memory */
buf[1]=0xc9; /* on-chip memory address */
- i2c_write(sht2x, buf, 2);
+ i2c_write(i2c, buf, 2);
memset(buf, 0, sizeof(buf) );
- i2c_read(sht2x, buf, 4);
+ i2c_read(i2c, buf, 4);
serialnumber[1]=buf[0]; /* Read SNC_1 */
serialnumber[0]=buf[1]; /* Read SNC_0 */
serialnumber[7]=buf[2]; /* Read SNA_1 */
serialnumber[6]=buf[3]; /* Read SNA_0 */
- dump_buf("SHT2x Serial number: ", serialnumber, 8);
+ print_buf("SHT2x Serial number: ", serialnumber, 8);
return 0;
}
-static int i2c_write(sht2x_t *sht2x, uint8_t *data, int len)
+/*+----------------------+
+ *| I2C API functions |
+ *+----------------------+*/
+
+int i2c_init(i2c_t *i2c, int mode, char *i2cdev, int addr)
{
- struct i2c_rdwr_ioctl_data i2cdata;
+ if( !i2c || !i2cdev || !addr )
+ return -1;
+
+ memset(i2c, 0, sizeof(*i2c));
+ i2c->addr = addr;
+ i2c->dev = i2cdev;
+ i2c->mode = mode;
+
+ if( (i2c->fd=open(i2cdev, O_RDWR)) < 0)
+ {
+ printf("open i2c device %s failed: %s\n", i2cdev, strerror(errno));
+ return -1;
+ }
+
+ if( MODE_RDWR == i2c->mode )
+ {
+ /* set I2C mode and SHT2x slave address */
+ ioctl(i2c->fd, I2C_TENBIT, 0); /* Not 10-bit but 7-bit mode */
+ ioctl(i2c->fd, I2C_SLAVE, i2c->addr); /* set SHT2x slave address */
+ }
+
+ return 0;
+}
+
+void i2c_term(i2c_t *i2c)
+{
+ if( !i2c )
+ return;
+
+ if( i2c->fd > 0)
+ close(i2c->fd);
+
+ return ;
+}
+
+int i2c_write(i2c_t *i2c, uint8_t *data, int len)
+{
+ struct i2c_rdwr_ioctl_data tr;
int rv = 0;
if( !data || len<= 0)
@@ -307,35 +335,35 @@
}
/* I2C device program API: read()/write() */
- if( MODE_RDWR == sht2x->mode )
+ if( MODE_RDWR == i2c->mode )
{
- write(sht2x->fd, data, len);
+ write(i2c->fd, data, len);
return 0;
}
/* I2C device program API: ioctl() */
- i2cdata.nmsgs = 1;
- i2cdata.msgs = malloc( sizeof(struct i2c_msg)*i2cdata.nmsgs );
- if ( !i2cdata.msgs )
+ tr.nmsgs = 1;
+ tr.msgs = malloc( sizeof(struct i2c_msg)*tr.nmsgs );
+ if ( !tr.msgs )
{
printf("%s() msgs malloc failed!\n", __func__);
return -2;
}
- i2cdata.msgs[0].addr = sht2x->addr;
- i2cdata.msgs[0].flags = 0; //write
- i2cdata.msgs[0].len = len;
- i2cdata.msgs[0].buf = malloc(len);
- if( !i2cdata.msgs[0].buf )
+ tr.msgs[0].addr = i2c->addr;
+ tr.msgs[0].flags = 0; //write
+ tr.msgs[0].len = len;
+ tr.msgs[0].buf = malloc(len);
+ if( !tr.msgs[0].buf )
{
printf("%s() msgs malloc failed!\n", __func__);
rv = -3;
goto cleanup;
}
- memcpy(i2cdata.msgs[0].buf, data, len);
+ memcpy(tr.msgs[0].buf, data, len);
- if( ioctl(sht2x->fd, I2C_RDWR, &i2cdata)<0 )
+ if( ioctl(i2c->fd, I2C_RDWR, &tr)<0 )
{
printf("%s() ioctl failure: %s\n", __func__, strerror(errno));
rv = -4;
@@ -343,18 +371,18 @@
}
cleanup:
- if( i2cdata.msgs[0].buf )
- free(i2cdata.msgs[0].buf);
+ if( tr.msgs[0].buf )
+ free(tr.msgs[0].buf);
- if( i2cdata.msgs )
- free(i2cdata.msgs);
+ if( tr.msgs )
+ free(tr.msgs);
return rv;
}
-static int i2c_read(sht2x_t *sht2x, uint8_t *buf, int size)
+int i2c_read(i2c_t *i2c, uint8_t *buf, int size)
{
- struct i2c_rdwr_ioctl_data i2cdata;
+ struct i2c_rdwr_ioctl_data tr;
int rv = 0;
if( !buf || size<= 0)
@@ -364,40 +392,40 @@
}
/* I2C device program API: read()/write() */
- if( MODE_RDWR == sht2x->mode )
+ if( MODE_RDWR == i2c->mode )
{
- read(sht2x->fd, buf, size);
+ read(i2c->fd, buf, size);
return 0;
}
/* I2C device program API: ioctl() */
- i2cdata.nmsgs = 1;
- i2cdata.msgs = malloc( sizeof(struct i2c_msg)*i2cdata.nmsgs );
- if ( !i2cdata.msgs )
+ tr.nmsgs = 1;
+ tr.msgs = malloc( sizeof(struct i2c_msg)*tr.nmsgs );
+ if ( !tr.msgs )
{
printf("%s() msgs malloc failed!\n", __func__);
return -2;
}
- i2cdata.msgs[0].addr = sht2x->addr;
- i2cdata.msgs[0].flags = I2C_M_RD; //read
- i2cdata.msgs[0].len = size;
- i2cdata.msgs[0].buf = buf;
+ tr.msgs[0].addr = i2c->addr;
+ tr.msgs[0].flags = I2C_M_RD; //read
+ tr.msgs[0].len = size;
+ tr.msgs[0].buf = buf;
memset(buf, 0, size);
- if( ioctl(sht2x->fd, I2C_RDWR, &i2cdata)<0 )
+ if( ioctl(i2c->fd, I2C_RDWR, &tr)<0 )
{
printf("%s() ioctl failure: %s\n", __func__, strerror(errno));
rv = -4;
}
- free( i2cdata.msgs );
+ free( tr.msgs );
return rv;
}
-/*+----------------+
- *| Misc functions |
- *+----------------+*/
+/*+----------------------+
+ *| Misc functions |
+ *+----------------------+*/
static inline void msleep(unsigned long ms)
{
@@ -418,7 +446,7 @@
nanosleep(&cSleep, 0);
}
-static inline void dump_buf(const char *prompt, uint8_t *buf, int size)
+void print_buf(const char *prompt, uint8_t *buf, int size)
{
int i;
@@ -440,3 +468,75 @@
return ;
}
+
+#define LINELEN 81
+#define CHARS_PER_LINE 16
+static char *print_char =
+" "
+" "
+" !\"#$%&'()*+,-./"
+"0123456789:;<=>?"
+"@ABCDEFGHIJKLMNO"
+"PQRSTUVWXYZ[\\]^_"
+"`abcdefghijklmno"
+"pqrstuvwxyz{|}~ "
+" "
+" "
+" ???????????????"
+"????????????????"
+"????????????????"
+"????????????????"
+"????????????????"
+"????????????????";
+
+void dump_buf(const char *prompt, char *buf, size_t len)
+{
+ int rc;
+ int idx;
+ char prn[LINELEN];
+ char lit[CHARS_PER_LINE + 2];
+ char hc[4];
+ short line_done = 1;
+
+ if( prompt )
+ printf("%s", prompt);
+
+ rc = len;
+ idx = 0;
+ lit[CHARS_PER_LINE] = '\0';
+
+ while (rc > 0)
+ {
+ if (line_done)
+ snprintf(prn, LINELEN, "%08X: ", idx);
+
+ do
+ {
+ unsigned char c = buf[idx];
+ snprintf(hc, 4, "%02X ", c);
+ strncat(prn, hc, LINELEN);
+
+ lit[idx % CHARS_PER_LINE] = print_char[c];
+ }
+ while (--rc > 0 && (++idx % CHARS_PER_LINE != 0));
+
+ line_done = (idx % CHARS_PER_LINE) == 0;
+ if (line_done)
+ {
+ printf("%s %s\r\n", prn, lit);
+ }
+ }
+
+ if (!line_done)
+ {
+ int ldx = idx % CHARS_PER_LINE;
+ lit[ldx++] = print_char[(int)buf[idx]];
+ lit[ldx] = '\0';
+
+ while ((++idx % CHARS_PER_LINE) != 0)
+ strncat(prn, " ", sizeof(prn)-strlen(prn));
+
+ printf("%s %s\r\n", prn, lit);
+
+ }
+}
--
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