Provide reliable, high-speed data storage for many applications with ANV32A62A and PIC18F2455
Lightning-fast memory for ultimate performance
Published Nov 01, 2023
Click board™
SRAM 2 Click
Dev Board
EasyPIC v8
Compiler
NECTO Studio
MCU
PIC18F2455
Our SRAM memory excels at delivering real-time responsiveness in a variety of devices and systems
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Hardware Overview
How does it work?
SRAM 2 Click is based on the ANV32A62A, an SRAM memory from Anvo-Systems Dresden. It uses nvSRAM which is ordinary SRAMs with the ability for self-sufficient, automatic backup of SRAM-data in an internal FLASH, All Read/Write operations are addressing the SRAM array only. From a user point of view, nvSRAM appears as ordinary SRAM. SRAM are fast, energy efficient and does not wear-out while R/W operations. This explains the superior speed and the unlimited R/W endurance of nvSRAM. Data transfers automatically to the non-volatile storage cells when power loss is detected or in any brown out situation (PowerStore). As long as power will be supplied within operating conditions all data stay volatile in the SRAM cells. SRAM 2 Click is using a standard two-wire interface (I²C) and is functional similar to serial EEPROMs or FRAM. The
addressing requires a 13 bit address out of the 2-byte address of the two-wire protocol. The jumpers ADDR SEL are device address inputs to select 1 of up to 4 devices of the same type on the same I²C bus. To select one device the hard wired addresses on the 2 pins have to match with the related bits in the slave address. This SRAM also features PowerStore operation which is a unique feature of the SONOS technology that is enabled by default on the ANV32A62A. During normal operation, the device will draw current from VCC for circuit operation and to charge a capacitor connected to the VCAP pin. This stored charge will be used by the chip to perform a single STORE operation in case of power down. If the voltage on the VCC pin drops below VSWITCH, the part will automatically disconnect the VCAP pin from VCC. A STORE operation will be initiated with power
provided by the VCAP capacitor. If a write operation is in progress all data of complete written pages are valid. Only the last incomplete written byte will be ignored. With the following Power Store execution these data become non-volatile. To reduce needless non-volatile stores, Power Store operation will be ignored unless at least one write operation has taken place since the most recent STORE cycle. The PowerStore Operation is valid for the complete memory array. This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.
Features overview
Development board
EasyPIC v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports many high pin count 8-bit PIC microcontrollers from Microchip, regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, EasyPIC v8 provides a fluid and immersive working experience, allowing access anywhere and under any
circumstances at any time. Each part of the EasyPIC v8 development board contains the components necessary for the most efficient operation of the same board. In addition to the advanced integrated CODEGRIP programmer/debugger module, which offers many valuable programming/debugging options and seamless integration with the Mikroe software environment, the board also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector.
Communication options such as USB-UART, USB DEVICE, and CAN are also included, including the well-established mikroBUS™ standard, two display options (graphical and character-based LCD), and several different DIP sockets. These sockets cover a wide range of 8-bit PIC MCUs, from the smallest PIC MCU devices with only eight up to forty pins. EasyPIC v8 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development 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
PIC
MCU Memory (KB)
24
Silicon Vendor
Microchip
Pin count
28
RAM (Bytes)
2048
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the EasyPIC v8 as your development board.
Track your results in real time
Application Output via UART Mode
1. Once the code example is loaded, pressing the "FLASH" button initiates the build process, and programs it on the created setup.
2. After the programming is completed, click on the Tools icon in the upper-right panel, and select the UART Terminal.
3. After opening the UART Terminal tab, first check the baud rate setting in the Options menu (default is 115200). If this parameter is correct, activate the terminal by clicking the "CONNECT" button.
4. Now terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.
Software Support
Library Description
This library contains API for SRAM 2 Click driver.
Key functions:
sram2_generic_write- Generic write function.sram2_generic_read- Generic read function.sram2_write_protect- Set PWM pin for write protection.
Open Source
Code example
This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.
/*!
* \file
* \brief Sram2 Click example
*
* # Description
* This demo application writes and reads from memory.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes driver init.
*
* ## Application Task
* Writes and then reads data from memory.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "sram2.h"
// ------------------------------------------------------------------ VARIABLES
static sram2_t sram2;
static log_t logger;
static char rx_data;
static uint8_t message_data[ 9 ] = { 'M', 'i', 'k', 'r', 'o', 'E', 13, 10, 0 };
static uint16_t memory_addr = 0x1234;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
sram2_cfg_t cfg;
/**
* 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.
sram2_cfg_setup( &cfg );
SRAM2_MAP_MIKROBUS( cfg, MIKROBUS_1 );
sram2_init( &sram2, &cfg );
Delay_ms( 100 );
}
void application_task ( void )
{
uint8_t cnt;
log_printf( &logger, ">> Write data [ MikroE ] to memory. \r\n" );
sram2_write_protect( &sram2, SRAM2_WR_ENABLE );
Delay_ms( 10 );
for ( cnt = 0; cnt < 8; cnt++ )
{
sram2_generic_write( &sram2, memory_addr + cnt, message_data[ cnt ] );
Delay_ms( 10 );
}
Delay_ms( 1000 );
sram2_write_protect( &sram2, SRAM2_WR_DISABLE );
Delay_ms( 10 );
log_printf( &logger, ">> Read data from memory. Data : " );
for ( cnt = 0; cnt < 8; cnt++ )
{
sram2_generic_read( &sram2, memory_addr + cnt, &rx_data );
Delay_ms( 10 );
log_printf( &logger, " %c ", rx_data );
Delay_ms( 100 );
}
log_printf( &logger, " \r\n" );
log_printf( &logger, "-------------------------------- \r\n" );
Delay_ms( 2000 );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
