Diff: Nucleo_mcp3204test.cpp

Revision:

0:55aac36c4f0f

Child:

1:50f0c5749724

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Nucleo_mcp3204test.cpp	Thu Jan 28 05:34:51 2016 +0000
@@ -0,0 +1,47 @@
+#include "mbed.h"
+ 
+SPI spi(D11, D12, D13); // mosi(out), miso(in), sclk(clock)
+DigitalOut cs(D10); // cs (the chip select signal)
+ 
+Serial pc(USBTX, USBRX); // tx, rx ( the usb serial communication )
+ 
+int main() {
+    // Setup the spi for 7 bit data, high steady state clock,
+    // second edge capture, with a 1MHz clock rate
+    spi.format(7,0);
+    spi.frequency(1000000);
+ 
+    // notify the user that we are starting with the ADC communication
+    pc.printf("Starting ADC interaction\n");
+    
+    // lets just do this forever
+    while (1) {
+ 
+        // Select the device by seting chip select low
+        cs = 0;
+ 
+        // sending the 6 bits + 1 bit to ignore the null bit
+        // coming from the device, so the data that is sent is 1100000
+        spi.write(0x60);
+        
+        // now the device sends back the readings 12 bits, 7 bits at a time
+        uint8_t high = spi.write(0x00);
+        uint8_t low = spi.write(0x00);
+ 
+        // shift out the right bits
+        low = ( high << 5 ) | (low >> 2);
+        high = high >> 3;
+        
+        // shift and or the result together
+        int value = ( high << 7 ) | low;
+        
+        // and voila we have the value and we can print it for the user
+        pc.printf("sensor 0 value = %u\n", value);
+ 
+        // Deselect the device
+        cs = 1;
+ 
+        // delay some time before reading again
+        wait(1);
+    }
+}
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