MCP4912 - Revision history

WikiSysop: /* Driver */

2013-09-04T18:39:06Z

‎Driver

Jorasse: /* Use it */

2013-03-11T13:54:49Z

‎Use it

Jorasse: /* Set channel values */

2013-03-07T08:06:32Z

‎Set channel values

Jorasse: /* Set channel values */

2013-03-07T08:02:48Z

‎Set channel values

Salocin68: /* Connections */

2011-10-07T06:05:27Z

‎Connections

JulienB: /* Description */

2011-10-06T20:01:19Z

‎Description

JulienB: /* Driver */

2011-05-03T08:41:26Z

‎Driver

Salocin68: /* Connections */

2011-04-26T14:08:45Z

‎Connections

Salocin68: /* Use it */

2011-04-26T14:07:48Z

‎Use it

Salocin68: /* set values */

2011-04-26T14:01:22Z

‎set values

@@ Line 14: / Line 14: @@
 <pre class="host">
-[  ] $ make linux26-menuconfig
+$ make linux-menuconfig
 </pre>
@@ Line 26: / Line 26: @@
 Then compile the distribution :
 <pre class="host">
-[  ] $ make linux26 && make
+$ make linux && make
 </pre>

@@ Line 56: / Line 56: @@
 </pre>
 To have both channels output updated simultaneously (value 2V) when setting the DAC B channel   :
 <pre class="apf">

@@ Line 56: / Line 56: @@
 </pre>
-To have both channels output updated (value 2V) when setting the DAC B channel   :
+To have both channels output updated simultaneously (value 2V) when setting the DAC B channel   :
 <pre class="apf">
 # echo 0 > dac_trigger_0

@@ Line 41: / Line 41: @@
 # cd /sys/bus/spi/devices/spi0.1/device0
 # ls
-dac_power_mode_0  out0_raw          power             uevent
+dac_power_mode_0     dac_trigger_1     power
-dac_power_mode_1  out1_raw          subsystem
+dac_power_mode_1     out0_raw          subsystem
 </pre>
@@ Line 53: / Line 54: @@
 <pre class="apf">
 # echo 412 > out1_raw
 </pre>

@@ Line 5: / Line 5: @@
 On your [[APF51Dev]] there are 2 signals to use:
 * DAC_OUTA: corresponds to OUTA (pin 1 of J5 on the [[APF51Dev]]). It's the first output.
-* DAC_OUTB: corresponds to OUTB (pin 10 of J5 on the [[APF51Dev]]). It's the 2nd output.
+* DAC_OUTB: corresponds to OUTB (pin 3 of J5 on the [[APF51Dev]]). It's the 2nd output.
 The default output voltage range is [0-2.5V] on the [[APF51Dev]] (because the 2,5V reference output of the [[AS1531]] is used as reference input for the MCP4912).

@@ Line 1: / Line 1: @@
-=Description=
+==Description==
-This 2 channels 10bits [[SPI]] DAC (Digital to Analog Converter) is mounted in standard on the [[APF51Dev]] development boards.
+This 2 channels 10bits [[SPI]] DAC (Digital to Analog Converter) is mounted on the [[APF51Dev]] development boards.
 ==Connections==
 On your [[APF51Dev]] there are 2 signals to use:
-* DAC_OUTA: corresponds to OUTA (pin 1 of J5 on the APF51Dev). It's the first output.
+* DAC_OUTA: corresponds to OUTA (pin 1 of J5 on the [[APF51Dev]]). It's the first output.
-* DAC_OUTB: corresponds to OUTB (pin 10 of J5 on the APF51Dev). It's the 2nd output.
+* DAC_OUTB: corresponds to OUTB (pin 10 of J5 on the [[APF51Dev]]). It's the 2nd output.
-The default output voltage range is 0->2.5V on the APF51Dev because the reference output of the [[AS1531]] is used as reference for the mcp4912
+The default output voltage range is [0-2.5V] on the [[APF51Dev]] (because the 2,5V reference output of the [[AS1531]] is used as reference input for the MCP4912).
 == Driver ==
-The driver is included in ARMadeus distribution, and has to be selected (done by default on [[APF51]]):
+The driver is included in the ARMadeus distribution, and has to be selected (done by default on [[APF51]]):
 <pre class="host">
@@ Line 30: / Line 30: @@
 == Use it ==
-=== modprobe ===
+=== Load driver ===
 To use the DAC first load module:
@@ Line 37: / Line 37: @@
 </pre>
-=== set values ===
+=== Set channel values ===
 <pre class="apf">
 # cd /sys/bus/spi/devices/spi0.1/device0
@@ Line 45: / Line 45: @@
 </pre>
-To set the dac A value to 2.48V (max range) :
+To set the DAC A channel value to 2.48V (max range) :
 <pre class="apf">
 # echo 1023 > out0_raw
 </pre>
-To set the dac B value to 1V :
+To set the DAC B channel value to 1V :
 <pre class="apf">
 # echo 412 > out1_raw