Revision 2:c4552b8c47c0, committed 2020-07-16

Comitter:

glsfacom

Date:

Thu Jul 16 10:58:18 2020 -0400

Parent:

1:c0d057b08394

Commit message:

One MLX setup

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.hgignore	Thu Jul 16 10:58:18 2020 -0400
@@ -0,0 +1,4 @@
+^BUILD$
+^.mbed$
+^mbed-os$
+^crc8$

--- a/Mlx90615.cpp	Wed Jul 15 18:55:10 2020 +0000
+++ b/Mlx90615.cpp	Thu Jul 16 10:58:18 2020 -0400
@@ -1,114 +1,102 @@
 #include "Mlx90615.h"
-#include "smbus.h"
+#include "crc8.h"
 
+extern Serial pc;
 I2C i2c(p28, p27);//I2C_SDA, I2C_SCL 
-void Mlx90615::wake()
+
+inline void 
+Mlx90615::wake()
 {
 	/*SCL = 0;
 	wait_ms(50);
 	SCL = 1;*/
 	MLX_VCC = 1;
-	wait_us(301*1000);//Waiting for valid data as datasheet says
+	ThisThread::sleep_for(301);//Waiting for valid data as datasheet says
 }
 
-unsigned int Mlx90615::sleep(){
+inline void 
+Mlx90615::sleep(){
 	MLX_VCC = 0;
-	return 1;
 }
 
-unsigned int Mlx90615::read(unsigned char memory, unsigned char address){
+float 
+Mlx90615::read(unsigned char memory, unsigned char address){
 	unsigned char crc, addr, status = 0;
-	unsigned int read = 0x0000;
+	char read[2];
+    int ACK = 0;
 
 	addr = memory + address;
+
+    read[0] = 0x01;
+    read[1] = 0x00;
 	
-	i2c.start();
-
-	smbus_send_address(0x5B, WRITE);
-	if(!i2c.ACK) return 0;
-
-	smbus_send_byte(addr);
-	if(!i2c.ACK) return 0;
-
+    char cmd = 0x27;
 	i2c.start();
-
-	smbus_send_address(0x5B, READ);
-	if(!i2c.ACK) return 0;
-
-	read = smbus_read_uint(&status, LITTLE_ENDIAN);	
-
-	crc = smbus_read_byte(&status);
-
-	smbus_stop();
-
-	return read;
+	ACK = i2c.write(0x5b<<1);
+	if(!ACK) return -1;
+    ACK = i2c.write(addr);
+	if(!ACK) return -1;
+	i2c.start();
+    ACK = i2c.write((0x5b<<1)|1);
+	if(!ACK) return -1;
+    read[0] = i2c.read(ACK);
+    if(!ACK) return -1;
+    read[1] = i2c.read(ACK);
+    i2c.read(ACK);
+	float temp = (float((read[1] << 8) | read[0]));
+	return temp*0.02-273.15;
 }
 
-unsigned int Mlx90615::read_temperature(){
-	unsigned int temp = read(RAM, 0x07);
+float 
+Mlx90615::read_temperature(){
+	float temp = read(RAM, 0x07);
+    int cont = 0;
 	while(temp == 0)
 	{
+        if(cont == 100)
+        {
+            pc.printf("got 100 times 0\n");
+            cont = 0;
+        }
 		wait_us(5000);
 		temp = read(RAM, 0x07);
+        cont++;
 	}
 	return temp;
 }
 
-/*float convert_to_celsius(unsigned int temperature){
-	return temperature * 0.02 - 273.15;
-}*/
-typedef unsigned char uint8_t;
-
-uint8_t gencrc(uint8_t *data, size_t len)
-{
-    uint8_t crc = 0xff;
-    size_t i, j;
-    for (i = 0; i < len; i++) {
-        crc ^= data[i];
-        for (j = 0; j < 8; j++) {
-            if ((crc & 0x80) != 0)
-                crc = (uint8_t)((crc << 1) ^ 0x31);
-            else
-                crc <<= 1;
-        }
-    }
-    return crc;
-}
-
-void Mlx90615::write(unsigned char address, unsigned int value){
+void 
+Mlx90615::write(unsigned char address, unsigned int value){
 	unsigned char addr = EEPROM + address;
-	unsigned char bytes[4], crc, vh, vl;
+	char *bytes;
+    unsigned char crc, vh, vl;
 	vh = value >> 8;
 	vl = value;
 	bytes[0] = 0xB6;
 	bytes[1] = addr;
 	bytes[2] = vl;
 	bytes[3] = vh;
-	crc = gencrc(bytes, 4);
-
-	i2c.start();
-
-	smbus_send_address(0x5B, WRITE);
-
-	smbus_send_byte(addr);
+	crc = crc8(bytes, 4);
 
-	smbus_send_byte(vl);
-
-	smbus_send_byte(vh);
-
-	smbus_send_byte(crc);
-
-	smbus_stop();
+    i2c.start();
+    i2c.write(0x5b<<1);
+	i2c.write(addr);
+	i2c.write(vl);
+    i2c.write(vh);
+	i2c.write(crc);
+    i2c.stop();
 }
 
-void Mlx90615::erase_eeprom_address(unsigned char address){
-	write(address, 0x0000);
+inline void 
+Mlx90615::erase_eeprom_address(unsigned char address){
+	Mlx90615::write(address, 0x0000);
 }
 
-void Mlx90615::set_emissivity(float e){
+void 
+Mlx90615::set_emissivity(float e){
 	unsigned int emissivity;
 	emissivity = 16384 * e;
 	erase_eeprom_address(0x03);
-	wait_us(5*1000);
-	write(0x03, emissivity);
+	ThisThread::sleep_for(5);
+	Mlx90615::write(0x03, emissivity);
 }

--- a/Mlx90615.h	Wed Jul 15 18:55:10 2020 +0000
+++ b/Mlx90615.h	Thu Jul 16 10:58:18 2020 -0400
@@ -11,12 +11,12 @@
 {
 public:
     void wake();
-    unsigned int sleep();
-    unsigned int read_temperature();
+    void sleep();
+    float read_temperature();
     void erase_eeprom_address(unsigned char address);
     void set_emissivity(float e);
 private:
-    unsigned int read(unsigned char memory, unsigned char address);
+    float read(unsigned char memory, unsigned char address);
     void write(unsigned char address, unsigned int value);
 };
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crc8.lib	Thu Jul 16 10:58:18 2020 -0400
@@ -0,0 +1,1 @@
+http://os.mbed.com/users/evwijk/code/crc8/#cc65a6cec1a181f708182f0e98e124c68c8d9a87
\ No newline at end of file

--- a/main.cpp	Wed Jul 15 18:55:10 2020 +0000
+++ b/main.cpp	Thu Jul 16 10:58:18 2020 -0400
@@ -8,22 +8,9 @@
 
 float temp;
 
-void setup()
-{
-    //Force SMBUS comm
-    c = 0;                              // Setup override pin to pull clock low
-    c.input();                          // Make it input to start with...
-    c.mode(PullUp);                     // ...with pull up
-    c.output();                         // Override clock pin low
-    ThisThread::sleep_for(0.00005);                      // Pause for treq 39ms
-    c.input();                          // Remove override...
-    c.mode(PullUp);                     // ...with pull up
-    ThisThread::sleep_for(0.00005);                      // Pause again
-}
-
 int main(){
     Mlx90615 mlx90615;
-    setup();
+    
     pc.printf("Hello World!\n");
     while(true){
       temp=mlx90615.read_temperature();