From d28311ba087748eabe8d93ba1d382dd713f4096c Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Sat, 23 Jan 2021 22:59:56 +0800
Subject: [PATCH] Add tsl2561 Linux I2C API programe
---
modules/c/tsl2561_i2c.c | 244 ++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 244 insertions(+), 0 deletions(-)
diff --git a/modules/c/tsl2561_i2c.c b/modules/c/tsl2561_i2c.c
new file mode 100644
index 0000000..f9a879b
--- /dev/null
+++ b/modules/c/tsl2561_i2c.c
@@ -0,0 +1,244 @@
+/*********************************************************************************
+ * Copyright: (C) 2019 LingYun IoT System Studio
+ * All rights reserved.
+ *
+ * Filename: tsl2561.c
+ * Description: This file is the Lux sensor TSL2561 API functions on RaspberryPi,
+ * which connected to I2C-1
+ *
+ * Version: 1.0.0(04/07/19)
+ * Author: Guo Wenxue <guowenxue@gmail.com>
+ * ChangeLog: 1, Release initial version on "04/07/19 17:39:38"
+ *
+ ********************************************************************************/
+
+#include <wiringPi.h>
+#include <wiringPiI2C.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <math.h>
+#include <errno.h>
+#include <time.h>
+
+#include <sys/ioctl.h>
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define TSL2561_I2C_ADDR 0x39
+
+#define CONTROL_REG 0x80
+#define REG_COUNT 4
+
+#define POWER_UP 0x03
+#define POWER_DOWN 0x00
+
+/* Register Address */
+enum
+{
+ /* Channel_0 = DATA0HIGH<<8 + DATA0LOW */
+ DATA0LOW = 0x8C,
+ DATA0HIGH,
+
+ /* Channel_1 = DATA1HIGH<<8 + DATA1LOW */
+ DATA1LOW,
+ DATA1HIGH,
+};
+
+
+int tsl_fd = -1;
+
+static const int regs_addr[REG_COUNT]={DATA0LOW, DATA0HIGH, DATA1LOW, DATA1HIGH};
+
+int tsl2561_init(void)
+{
+ if(tsl_fd > 0)
+ return 0;
+
+ if( (tsl_fd=open("/dev/i2c-1", O_RDWR)) < 0)
+ {
+ printf("TSL2561 I2C device setup failure: %s\n", strerror(errno));
+ return -1;
+ }
+
+ printf("TSL2561 initialise ok, tsl_fd=%d\n", tsl_fd);
+ return tsl_fd;
+}
+
+#define ON 1
+#define OFF 0
+
+void tsl2561_power(int cmd)
+{
+ struct i2c_msg msg;
+ struct i2c_rdwr_ioctl_data data;
+ unsigned char buf[2];
+
+ msg.addr= TSL2561_I2C_ADDR;
+ msg.flags=0; /* write */
+ msg.len= 1;
+ msg.buf= buf;
+
+ data.nmsgs= 1;
+ data.msgs= &msg;
+
+ msg.buf[0]=CONTROL_REG;
+ if( ioctl(tsl_fd, I2C_RDWR, &data) < 0 )
+ {
+ printf("%s() ioctl failure: %s\n", __func__, strerror(errno));
+ return ;
+ }
+
+
+ if( cmd )
+ msg.buf[0]=POWER_UP;
+ else
+ msg.buf[0]=POWER_DOWN;
+
+ if( ioctl(tsl_fd, I2C_RDWR, &data) < 0 )
+ {
+ printf("%s() ioctl failure: %s\n", __func__, strerror(errno));
+ return ;
+ }
+
+ return ;
+}
+
+int tsl2561_readreg(unsigned char regaddr, unsigned char *regval)
+{
+ struct i2c_msg msg;
+ struct i2c_rdwr_ioctl_data data;
+ unsigned char buf[2];
+
+ msg.addr= TSL2561_I2C_ADDR;
+ msg.flags=0; /* write */
+ msg.len= 1;
+ msg.buf= buf;
+ msg.buf[0] = regaddr;
+
+ data.nmsgs= 1;
+ data.msgs= &msg;
+
+ if( ioctl(tsl_fd, I2C_RDWR, &data) < 0 )
+ {
+ printf("%s() ioctl failure: %s\n", __func__, strerror(errno));
+ return -1;
+ }
+
+ memset(buf, 0, sizeof(buf));
+
+ msg.addr= TSL2561_I2C_ADDR;
+ msg.flags=I2C_M_RD; /* read */
+ msg.len= 1;
+ msg.buf= buf;
+
+ data.nmsgs= 1;
+ data.msgs= &msg;
+
+ if( ioctl(tsl_fd, I2C_RDWR, &data) < 0 )
+ {
+ printf("%s() ioctl failure: %s\n", __func__, strerror(errno));
+ return -1;
+ }
+
+ *regval = msg.buf[0];
+ return 0;
+}
+
+
+
+int tsl2561_get_lux(void)
+{
+ int i;
+ unsigned char reg_data[REG_COUNT];
+ unsigned char buf;
+
+ int chn0_data = 0;
+ int chn1_data = 0;
+
+ double div = 0.0;
+ double lux = 0.0;
+
+
+ tsl2561_power(ON);
+
+ delay(410); /* t(CONV) MAX 400ms */
+
+ /* Read register Channel0 and channel1 data from register */
+ for(i=0; i<REG_COUNT; i++)
+ {
+ tsl2561_readreg(regs_addr[i], ®_data[i]);
+ }
+
+ chn0_data = reg_data[1]*256 + reg_data[0]; /* Channel0 = DATA0HIGH<<8 + DATA0LOW */
+ chn1_data = reg_data[3]*256 + reg_data[2]; /* channel1 = DATA1HIGH<<8 + DATA1LOW */
+
+ if( chn0_data<=0 || chn1_data<0 )
+ {
+ lux = 0.0;
+ goto OUT;
+ }
+
+ div = (double)chn1_data / (double)chn0_data;
+
+ if( div>0 && div<=0.5 )
+ lux = 0.304*chn0_data-0.062*chn0_data*pow(div,1.4);
+
+ else if( div>0.5 && div<=0.61 )
+ lux = 0.0224*chn0_data-0.031*chn1_data;
+
+ else if( div>0.61 && div<=0.8 )
+ lux = 0.0128*chn0_data-0.0153*chn1_data;
+
+ else if( div>0.8 && div<=1.3 )
+ lux = 0.00146*chn0_data-0.00112*chn1_data;
+
+ else if( div>1.3 )
+ lux = 0.0;
+
+OUT:
+ printf("TSLl2561 get lux: %.3f\n", lux);
+
+ tsl2561_power(OFF);
+}
+
+void print_datime(void)
+{
+ time_t tmp;
+ struct tm *p;
+
+ time(&tmp);
+
+ p=localtime(&tmp);
+
+
+ printf("%d-%02d-%02d %02d:%02d:%02d\t", (p->tm_year+1900),(p->tm_mon+1),
+ p->tm_mday, p->tm_hour, p->tm_min, p->tm_sec);
+
+}
+
+int main(int argc, char **argv)
+{
+ int interval = 1;
+
+ if( argc >= 2 )
+ {
+ interval = atoi(argv[1]);
+ }
+
+ tsl2561_init();
+
+ while(1)
+ {
+ print_datime();
+ tsl2561_get_lux();
+ sleep(interval);
+ }
+
+}
+
+
--
Gitblit v1.9.1