Ensure reliable conversion of analog signals to digital format with TLA2518 and PIC32MZ2048EFH100
Precision meets conversion
Published Jun 01, 2023
Click board™
ADC 20 Click
Dev. board
Flip&Click PIC32MZ
Compiler
NECTO Studio
MCU
PIC32MZ2048EFH100
Upgrade your designs with our advanced Analog-To-Digital converter and achieve precision like never before
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Hardware Overview
How does it work?
ADC 20 Click is based on the TLA2518, a small, eight-channel, multiplexed, 12-bit, 1-MSPS, analog-to-digital converter (ADC) from Texas Instruments. The TLA2518 has an internal oscillator for the ADC conversion process and supports averaging multiple data samples with a single conversion start. Also, the built-in programmable averaging filters, which output a 16-bit result for enhanced resolution, help reduce noise from the analog inputs and the number of data samples required to be read by the host MCU. The analog input channel selection can be auto-sequenced to simplify the digital interface with the host MCU. This Click board™ communicates with MCU through a standard SPI interface, supporting all four SPI-compatible protocols (SPI Mode 0, 1, 2, and 3) to access
the device, and operates at clock rates up to 60MHz for all configurations and information management and acquiring conversion results. As mentioned, the TLA2518 powers up in Manual mode and can be configured into either of three operational modes by writing the configuration registers for the desired mode. The Manual mode allows the host MCU to directly select the analog input channel, while in the second, the On-the-Fly mode of operation, the analog input channel is set using the first five bits on the SDI signal without waiting for the CS rising edge. This way, the ADC samples the newly selected channel on the CS edge, and there is no latency between the channel selection and the ADC output data. In the third Auto-Sequence mode, the internal channel sequencer
switches the multiplexer to the next analog input channel after every conversion. In addition to the fact that all eight channels, also including channels on the side headers, can be used as analog input pins, this board allows for some channels, in this case, channels CH0, CH1, CH6, and CH7 of the TLA2518 to be configured as digital inputs, open-drain digital outputs, and push-pull digital outputs. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.
Features overview
Development board
Flip&Click PIC32MZ is a compact development board designed as a complete solution that brings the flexibility of add-on Click boards™ to your favorite microcontroller, making it a perfect starter kit for implementing your ideas. It comes with an onboard 32-bit PIC32MZ microcontroller, the PIC32MZ2048EFH100 from Microchip, four mikroBUS™ sockets for Click board™ connectivity, two USB connectors, LED indicators, buttons, debugger/programmer connectors, and two headers compatible with Arduino-UNO pinout. Thanks to innovative manufacturing technology,
it allows you to build gadgets with unique functionalities and features quickly. Each part of the Flip&Click PIC32MZ development kit contains the components necessary for the most efficient operation of the same board. In addition, there is the possibility of choosing the Flip&Click PIC32MZ programming method, using the chipKIT bootloader (Arduino-style development environment) or our USB HID bootloader using mikroC, mikroBasic, and mikroPascal for PIC32. This kit includes a clean and regulated power supply block through the USB Type-C (USB-C) connector. All communication
methods that mikroBUS™ itself supports are on this board, including the well-established mikroBUS™ socket, user-configurable buttons, and LED indicators. Flip&Click PIC32MZ development kit allows you to create a new application in minutes. Natively supported by Mikroe software tools, it covers many aspects of prototyping thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC32
MCU Memory (KB)
2048
Silicon Vendor
Microchip
Pin count
100
RAM (Bytes)
524288
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Flip&Click PIC32MZ as your development board.
Track your results in real time
Application Output
1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.
2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.
3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.
Software Support
Library Description
This library contains API for ADC 20 Click driver.
Key functions:
adc20_read_dataThis function reads two bytes of data by using SPI serial interface.adc20_set_gpo_valueThis function sets the gpo value for the selected channels.adc20_read_gpio_valueThis function reads the gpio pins value.
Open Source
Code example
The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.
/*!
* @file main.c
* @brief ADC 20 Click example
*
* # Description
* This example demonstrates the use of ADC 20 Click board by displaying the state of 8 channels
* configured as analog inputs (CH2-CH5), digital inputs (CH0-CH1) and digital outputs (CH6-CH7).
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and performs the Click default configuration.
*
* ## Application Task
* Starts the auto sequence mode, reads the 12bit ADC value from analog input channels (CH2-CH5) and
* displays the values converted to voltage on the USB UART. After that, stops auto sequence mode and
* toggles the state of digital output pins (CH6-CH7), then reads and displays the state of all GPIO pins.
*
* @author Stefan Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "adc20.h"
static adc20_t adc20;
static log_t logger;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
adc20_cfg_t adc20_cfg; /**< Click config object. */
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
adc20_cfg_setup( &adc20_cfg );
ADC20_MAP_MIKROBUS( adc20_cfg, MIKROBUS_1 );
if ( SPI_MASTER_ERROR == adc20_init( &adc20, &adc20_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( ADC20_ERROR == adc20_default_cfg ( &adc20 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
adc20_start_auto_sequence ( &adc20 );
for ( uint8_t ch_id = ADC20_CHANNEL_ID_2; ch_id <= ADC20_CHANNEL_ID_5; ch_id++ )
{
uint16_t adc_data = 0;
if ( ADC20_OK == adc20_read_data ( &adc20, &adc_data ) )
{
float voltage = ( float ) ( adc_data >> ADC20_ADC_OFFSET ) / ADC20_RES_12BIT * ADC20_VREF_3V3;
log_printf ( &logger, " AIN%u: %.2f V\r\n", ( adc_data & ADC20_CHANNEL_ID_MASK ), voltage );
}
}
adc20_stop_auto_sequence ( &adc20 );
static uint8_t out_logic_state = ADC20_GPIO_VALUE_LOW;
if ( ADC20_OK == adc20_set_gpo_value ( &adc20, ( ADC20_CHANNEL_6 | ADC20_CHANNEL_7 ), out_logic_state ) )
{
uint8_t gpio_value = 0;
if ( ADC20_OK == adc20_read_gpio_value ( &adc20, &gpio_value ) )
{
log_printf ( &logger, " GPIO state: 0x%.2X\r\n", gpio_value );
}
}
out_logic_state = !out_logic_state;
log_printf ( &logger, "\r\n" );
Delay_ms ( 1000 );
}
int main ( void )
{
/* Do not remove this line or clock might not be set correctly. */
#ifdef PREINIT_SUPPORTED
preinit();
#endif
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END
