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====== Evaluating the EVAL-LTC4306 =======

==== Supported Evaluation Boards =====
  * [[adi>EVAL-LTC4306]]

===== Overview =====
The [[ADI>EVAL-LTC4306]] features the [[adi>LTC4306]], a 4-channel, 2-wire I2C bus and SMBus-compatible multiplexer, which has bus buffers that provide capacitive isolation between the upstream bus and downstream buses. 
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This evaluation board provides 6-pin PMOD connectors for upstream and downstream connection for compatibility with PMOD form factors such as [[ADI>EVAL-ADICUP3029]], an Arduino-based wireless development platform for Internet of Things applications based on an ultralow power ARM Cortex-M3 processor.
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The [[ADI>EVAL-LTC4306]] comes with PMOD connectors and 10 kΩ pull up resistors on both the upstream and downstream side, and 0.1 µF bypass capacitor on the upstream side. The user also has the option to add a 6-pin, 2.54 mm pitch pin header for connection to the GPIO pins for added functionality. 
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The user can also add test points on different places on the board for fault monitoring and place additional bypass capacitors (0805 size footprint) on the upstream and the downstream side for defense against any unwanted noise in their system and for adequate bypassing on power supply lines.
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{{:resources:tools-software:uc-drivers:eval-ltc4306-pmdz-angle-web.png?400|}}
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===== ADI No-OS =====
The goal of ADI Microcontroller No-OS is to provide reference projects for lower end processors, which can't run Linux or aren't running a specific operating system, and to help those customers using microcontrollers with ADI parts. ADI No-OS offers **generic drivers**, which can be used as a base for any microcontroller platform and also **example projects**, which are using these drivers on various microcontroller platforms. 

For more information about ADI No-OS and supported microcontroller platforms, visit the No-OS User Guide found [[:resources:no-os | here]]. 
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===== LTC4306 No-OS Driver =====

Information about the LTC4306 driver can be found here: 
[[:resources:tools-software:uc-drivers:ltc4306 | LTC4306 No-OS Driver]]
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===== No-OS Supported Platforms =====
==== Maxim Platform ====
=== Hardware Setup ===
== Required Hardware ==
  * [[ADI>EVAL-LTC4306]]
  * [[ADI>MAX9611PMB1]]
  * [[ADI>MAX32666FTHR]]
{{:resources:eval:user-guides:eval-ltc4306:ltc4306_max.png?600|}}
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== Required Connections ==
The [[ADI>MAX32666FTHR]] does not have a PMOD interface, but you may use Dupont female-female cables to make the required connections.
The table below shows the connection between [[ADI>EVAL-LTC4306]] and [[ADI>MAX32666FTHR]].

^ EVAL-LTC4306 Pin Number (P3) ^ MAX32666 Pin Number ^ Function ^ Mnemonic ^
| VCC  | 3V3   | 3.3 V Supply (for IO) | 3V3  |
| GND  | GND   | Board Ground          | GND  |
| SCLIN  | SCL | Serial Clock         | SCL |
| SDAIN  | SDA | Serial Data  | SDA |

Once the [[ADI>EVAL-LTC4306]] and [[ADI>MAX32666FTHR]] are connected, the [[ADI>MAX9611PMB1]]'s can be connected to the [[ADI>LTC4306]] channels via the PMOD connectors. Secure the connections to ensure proper and continuous operation of the setup.
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For Maxim platforms, the following UART settings are used:
<WRAP round center 50%>
|  Speed  |  **57600**  |
|   Data Bits  |  **8**  |
|   Stop Bits  |  **1**  |
|   Parity  |  **None**  |
|   Flow Control  |  **None**  |
</WRAP>
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==== ADuCM3029 Platform ====
=== Hardware Setup ===
== Required Hardware ==
  * [[ADI>EVAL-LTC4306]]
  * [[ADI>MAX9611PMB1]]
  * [[ADI>EVAL-ADICUP3029]]
{{:resources:eval:user-guides:eval-ltc4306:ltc4306_aducm.png?600|}}
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== Required Connections ==
Connect the [[ADI>EVAL-LTC4306]] via the [[ADI>EVAL-ADICUP3029]]'s PMOD I2C headers (8 pins, P9). Once connected, attach the [[ADI>MAX9611PMB1]]'s to one or more channels. Secure the connections to ensure proper and continuous operation of the setup.
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For [[adi>ADuCM3029]] platform, the following UART settings are used:
<WRAP round center 50%>
| Speed        | **115200** |
| Data Bits    | **8**      |
| Stop Bits    | **1**      |
| Parity       | **None**   |
| Flow Control | **None**   |
</WRAP>

===== No-OS Build Setup =====

==== No-OS Clone ====
{{page>:resources/no-os/build#no-os_project_build_guide&firstseconly&nofooter&noeditbtn&noheader}}

==== No-OS Build Prerequisites ====
Follow the steps below for No-OS setup based on the environment you are using. 
Make sure you use the information for the specific platform you are using (e.g., MAXIM).

{{page>:resources/no-os/build#build_prerequisites&firstseconly&nofooter&noeditbtn&noheader}}

==== No-OS Build Project ====
The path of the project is no-OS/projects/eval-ltc4306/

{{page>:resources/no-os/build#building_a_project&firstseconly&nofooter&noeditbtn&noheader}}

==== Debug ====
{{page>:resources/no-os/build#runningdebugging&firstseconly&nofooter&noeditbtn&noheader}}

===== Example Project Execution =====
==== Basic Example Project ====
=== Project Description ===
The basic project contains the generic HAL initialization of the used platform, together with the I2C, and UART driver configuration and initialization.

The I2C driver is used to communicate with the [[ADI>EVAL-LTC4306]] and [[ADI>MAX9611PMB1]] to change settings, and the UART driver is used to display on the host machine any information to help in understanding the project's operation.

The basic project contains the [[ADI>LTC4306]] driver initialization and project functions:
<code C>
/* Continuously configure the part and measure pins with an oscilloscope for observation */
	struct ltc4306_dev *ltc4306;
	struct max538x_dev *max538x;
	float v0[] = {0.16, 0.26, 0.36, 0.46, 0.56, 0.66, 0.76, 0.86, 0.96};
	float inc = 0.5;
	int ret, i, j;
	int voltage_inc = NO_OS_ARRAY_SIZE(v0);
	int flash_instances = 16;

	ret = ltc4306_addr_gen(&ltc4306_user_init, LTC4306_HIGH, LTC4306_HIGH,
			       LTC4306_HIGH);
	if (ret)
		goto error_ltc4306;

	ret = ltc4306_init(&ltc4306, ltc4306_user_init);
	if (ret)
		goto error_ltc4306;

	ret = max538x_init(&max538x, max538x_user_init);
	if (ret)
		goto error_max538x;

	for (i = 1; i < 3; i++) {
		ret = ltc4306_set_gpio_output_state(ltc4306, i, true);
		if (ret)
			goto error_ltc4306;
	}

	pr_info("LTC4306 GPIO LED's will blink %d times:\n", flash_instances);

	/* Blink LTC4306 Green LEDs*/
	for (i = 0; i < flash_instances; i++) {
		ret = ltc4306_set_gpio_output_state(ltc4306, 2, false);
		if (ret)
			goto error_ltc4306;

		no_os_mdelay(50);

		ret = ltc4306_set_gpio_output_state(ltc4306, 1, false);
		if (ret)
			goto error_ltc4306;

		no_os_mdelay(50);

		ret = ltc4306_set_gpio_output_state(ltc4306, 2, true);
		if (ret)
			goto error_ltc4306;

		no_os_mdelay(50);

		ret = ltc4306_set_gpio_output_state(ltc4306, 1, true);
		if (ret)
			goto error_ltc4306;

		no_os_mdelay(50);
	}

	/* Turn OFF LTC4306 Green GPIO LEDs */
	ret = ltc4306_set_gpio_output_state(ltc4306, 1, true);
	if (ret)
		goto error_ltc4306;

	ret = ltc4306_set_gpio_output_state(ltc4306, 2, true);
	if (ret)
		goto error_ltc4306;

	pr_info("LTC4306 configure the %d attached MAX5380 DAC's: \n",
		LTC4306_NUM_DOWNSTREAM);
	for (i = 0; i < LTC4306_NUM_DOWNSTREAM; i++) {
		pr_info("DAC %d: \t", i + 1);
		for (j = 0; j < voltage_inc; j++) {
			pr_info("%0.4f \t", (v0[j] + (inc * (float)i)));
		}
		pr_info("\n");
	}

	no_os_mdelay(50);

	/* Multiple DAC Configuration Loop */
	while (1) {
		for (j = 0; j < voltage_inc; j ++) {
			for (i = 0; i < LTC4306_NUM_DOWNSTREAM; i++) {
				ret = ltc4306_set_downstream_channel(ltc4306,
								     LTC4306_USED_DOWNSTREAM_CHANNELS[i], true);
				if (ret)
					goto error_ltc4306;

				ret = max538x_set_voutput(max538x, (v0[j] + (inc * (float)i)));
				if (ret)
					goto error_max538x;

				ret = ltc4306_set_downstream_channel(ltc4306,
								     LTC4306_USED_DOWNSTREAM_CHANNELS[i], false);
				if (ret)
					goto error_ltc4306;
			}
		}// end num downstream
	}// end while
</code>

=== Project Execution ===
Serial output when running the basic project:
<code>
LTC4306 GPIO LED's will blink 16 times:
LTC4306 configure the 2 attached MAX5380 DAC's:
DAC 1: 0.1600  0.2600  0.3600  0.4600  0.5600  0.6600  0.7600  0.8600  0.9600 
DAC 2: 0.6600  0.7600  0.8600  0.9600  1.0600  1.1600  1.2600  1.3600  1.4600
</code>
{{:resources:eval:user-guides:eval-ltc4306:ltc4306_project_serial.png?600|}}

=== Output Capture ===
The image below shows the example scope shot with two [[adi>MAX9611PMB]]'s connected to Channels 1 and 2 of the [[adi>LTC4306]]:
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{{:resources:eval:user-guides:eval-ltc4306:ltc4306_project_scope_shot.png?600|}}
^ Legend ^^
| Orange | Channel 1 |
| Purple | Channel 2 |
| Time | 20 mS/div | 
| Amplitude | 500 mV/div |
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=== Hardware Output Checking ===
To check the hardware output when using the example code, follow below steps:
  - Connect the [[ADI>EVAL-LTC4306]] to the microcontroller board by following the required connections in [[#internal|Hardware Setup]].
  - Connect the [[ADI>MAX9611PMB1]]'s to the corresponding channels (check **LTC4306_NUM_DOWNSTREAM** variable in //**basic_example.c**// for any changes necessary or reference) on the [[ADI>EVAL-LTC4306]].
  - Build and load the example .hex file to the microcontroller board.
  - Reset or reconnect the microcontroller board to the computer or a power supply.
  - Observe the [[ADI>EVAL-LTC4306]]'s green GPIO LEDs blink for a couple of times (default is 16 times).
  - Connect each [[ADI>MAX9611PMB1]] output to an oscilloscope channel.
  - For proper operation, a sawtooth wave offset from each other should be seen (i.e., 500 mV offset between Ch1 and Ch2).
<note>The example project runs sequentially and continuously repeats the process until power is removed. </note>
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==== More Information and Useful Links ====
  * [[:resources:tools-software:uc-drivers:ltc4306|LTC4306 No-OS Driver]]
  * [[:resources:no-os]]
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//End of document
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