yasuyuki onodera / Mbed 2 deprecated mbed_MCP4726

MCP4726 sample

Dependencies:   AQM0802 MCP4726 mbed

See http://developer.mbed.org/users/yasuyuki/notebook/MCP4726/

Files at this revision

API Documentation at this revision

Revision 0:676aa4ff0765, committed 2014-10-15

Comitter:
yasuyuki
Date:
Wed Oct 15 14:45:19 2014 +0000
Commit message:
first release

Changed in this revision

AQM0802.lib Show annotated file Show diff for this revision Revisions of this file
MCP4726.lib Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file 
diff -r 000000000000 -r 676aa4ff0765 AQM0802.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AQM0802.lib	Wed Oct 15 14:45:19 2014 +0000
@@ -0,0 +1,1 @@
+https://mbed.org/users/yasuyuki/code/AQM0802/#6fa303916aa8

diff -r 000000000000 -r 676aa4ff0765 MCP4726.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MCP4726.lib	Wed Oct 15 14:45:19 2014 +0000
@@ -0,0 +1,1 @@
+http://developer.mbed.org/users/yasuyuki/code/MCP4726/#f0980556dfc0

diff -r 000000000000 -r 676aa4ff0765 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Oct 15 14:45:19 2014 +0000
@@ -0,0 +1,84 @@
+//**********************
+// DDS with DAC 12bits
+// MCP4726 sample for mbed
+//
+// output
+// (1)sin wave with DDS, 1Hz-1KHz
+//
+// (C)Copyright 2014 All rights reserved by Y.Onodera
+// http://einstlab.web.fc2.com
+//**********************
+#include "mbed.h"
+#include "AQM0802.h"
+#include "MCP4726.h"
+
+#define PI 3.14159265
+// sampling frequency for DDS
+// 400KHz
+#define S   8400
+// 1MHz
+//#define S   12000
+
+#if defined(TARGET_LPC1768)
+I2C i2c(p28,p27);
+#endif
+// for TG-LPC11U35-501
+#if defined(TARGET_LPC11U35_501)
+I2C i2c(P0_5,P0_4);
+#endif
+// for Nucleo
+#if defined(TARGET_NUCLEO_F401RE)
+I2C i2c(D14,D15);
+#endif
+AQM0802 lcd(i2c);
+MCP4726 mcp4726(i2c);
+Ticker dds;
+
+unsigned short f;
+unsigned short sin_table[360];
+
+
+void sampling()
+{
+    static int t=0;
+    unsigned short x;
+    float a;
+
+    x=360*modff((float)f*t/S,&a);
+    x = sin_table[x];
+    if(++t>=S)t=0;
+
+    // D/A
+    mcp4726.put(x);
+}
+
+
+int main() {
+    
+    char msg[10];
+    int i;
+    
+    // to make 12bits sine table
+    for(i=0;i<360;i++){
+        sin_table[i]=0x7ff*sin(2*PI/360*i)+0x7ff;
+    }
+
+    // start signal with sampling
+    dds.attach_us(&sampling,1000000/S);    // for us
+
+    while(1){
+        // Set f, test signal
+        // 10-1KHz
+        for(f=10;f<=1000;f+=10){
+            sprintf(msg, "%5d Hz", f );
+            __disable_irq();
+            lcd.locate(0,0);
+            lcd.print(msg);
+            __enable_irq();
+            wait(1);
+        }
+    }
+
+}
+
+

diff -r 000000000000 -r 676aa4ff0765 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Oct 15 14:45:19 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/552587b429a1
\ No newline at end of file