Revision 1:444f907aa5eb, committed 2022-01-09

Comitter:

timo_k2

Date:

Sun Jan 09 19:07:52 2022 +0000

Parent:

0:fb0f74ee7b70

Commit message:

Initial commit on Keil Studio.

Changed in this revision

--- a/README.md	Tue Nov 17 16:01:26 2020 +0000
+++ b/README.md	Sun Jan 09 19:07:52 2022 +0000
@@ -1,7 +1,9 @@
 The code is developed for the hardware NUCLEO-L432KC or any other board
 with SPI communication and the Digilent Pmod ALS1 ambient light sensor module.
 The purpose is to make students to understand the development process. 
-They need to study the original analog to digital converter documentation to
-understand how the converter 16 bit output is converted to an illuminance value. 
+They need to study the original analog to digital converter documentation for 
+the Texas Instruments ADC081S021 to understand how the converter 16 bit output 
+is converted to an illuminance value. 
 
-The software is provided under Apache-2.0 license. 
\ No newline at end of file
+### License and contributions
+ The software is provided under Apache-2.0 license. 
\ No newline at end of file

--- a/main.cpp	Tue Nov 17 16:01:26 2020 +0000
+++ b/main.cpp	Sun Jan 09 19:07:52 2022 +0000
@@ -32,6 +32,7 @@
 * 
 * Timo Karppinen 17.11.2020
 **************************************************************/
+#include "ThisThread.h"
 #include "mbed.h"
 
 DigitalOut LED(D1);  // LD1 to LD4 pin names are linked to D13 in L432KC.
@@ -48,11 +49,12 @@
 {   
 // SPI for the ALS        
         // Setup the spi for 8 bit data, high steady state clock,
-        // second edge capture, with a 12MHz clock rate
+        // second edge capture, with a 2MHz clock rate
         spi.format(8,0);           
-        spi.frequency(12000000);
+        spi.frequency(2000000);
         // ready to wait the conversion start
         alsCS.write(1);
+        ThisThread::sleep_for(1ms);
 
     while (true) {
      
@@ -85,10 +87,12 @@
     // Begin the conversion process and serial data output
     alsCS.write(0); 
     // Reading two 8bit bytes by writing two dymmy 8bit bytes
+    ThisThread::sleep_for(1ms);
     alsByte0 = spi.write(0x00);
     alsByte1 = spi.write(0x00);
     // End of serial data output and back to tracking mode
     alsCS.write(1);
+    ThisThread::sleep_for(1ms);
     // Check the http://www.ti.com/lit/ds/symlink/adc081s021.pdf
     // shifting bits to get the number out
     alsByteSh0 = alsByte0 << 4;