SRAM's combination of speed and power efficiency makes it an essential component in the world of modern electronics
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Hardware Overview
How does it work?
SRAM 4 Click is based on the CY14B512Q, a 512Kbit nvSRAM memory organized as 64K words of 8 bits each from Infineon. The nvSRAM specifies one million endurance cycles for nonvolatile cells with data retention of a minimum of 20 years. All the reads and writes to nvSRAM happen to the SRAM, which gives nvSRAM the unique capability to handle infinite writes to the memory. The embedded nonvolatile elements incorporate the QuantumTrap technology, making this Click board™ an ideal choice for secure data storage, creating the world’s most reliable nonvolatile memory. The CY14B512Q communicates with MCU through a standard SPI interface that enables very high clock speeds up to 40MHz with zero cycle
delay read and write cycles. It also supports the two most common modes, SPI Mode 0 and 3, and 104 MHz SPI access speed with special instructions for the read operation. Besides, the SRAM 4 Click also has an additional HOLD signal, routed to the PWM pin of the mikroBUS™ socket labeled as HLD, used to suspend the serial communication without resetting the serial sequence. The CY14B512Q uses the standard SPI opcodes for memory access. In addition to the general SPI instructions for reading and writing, also provide four special instructions: STORE, RECALL, AutoStore Disable, and AutoStore Enable. The significant benefit of this memory over serial EEPROMs is that all reads and writes to nvSRAM
are performed at the speed of the SPI bus with zero cycle delay. Therefore, no wait time is required after any of the memory accesses. Only the STORE and RECALL operations need finite time to complete, and all memory accesses are inhibited during this time. 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
Curiosity PIC32 MZ EF development board is a fully integrated 32-bit development platform featuring the high-performance PIC32MZ EF Series (PIC32MZ2048EFM) that has a 2MB Flash, 512KB RAM, integrated FPU, Crypto accelerator, and excellent connectivity options. It includes an integrated programmer and debugger, requiring no additional hardware. Users can expand
functionality through MIKROE mikroBUS™ Click™ adapter boards, add Ethernet connectivity with the Microchip PHY daughter board, add WiFi connectivity capability using the Microchip expansions boards, and add audio input and output capability with Microchip audio daughter boards. These boards are fully integrated into PIC32’s powerful software framework, MPLAB Harmony,
which provides a flexible and modular interface to application development a rich set of inter-operable software stacks (TCP-IP, USB), and easy-to-use features. The Curiosity PIC32 MZ EF development board offers expansion capabilities making it an excellent choice for a rapid prototyping board in Connectivity, IOT, and general-purpose applications.
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
Schematic
Step by step
Project assembly
Track your results in real time
Application Output via Debug Mode
1. Once the code example is loaded, pressing the "DEBUG" button initiates the build process, programs it on the created setup, and enters Debug mode.
2. After the programming is completed, a header with buttons for various actions within the IDE becomes visible. Clicking the green "PLAY" button starts reading the results achieved with the Click board™. The achieved results are displayed in the Application Output tab.
Software Support
Library Description
This library contains API for SRAM 4 Click driver.
Key functions:
sram4_memory_read
- Read data from memory.sram4_memory_write
- Write data to memory.sram4_generic_command
- Command writing function.
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 main.c
* @brief SRAM4 Click example
*
* # Description
* This example application showcases ability of device
* ability to manipulate with memory( writing and reading data ).
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initialization of communication modules(SPI, UART) and additional
* pins. Reads ID and checks if it matches with SRAM4_DEVICE_ID to
* check communication. Then clears protection from memory access.
*
* ## Application Task
* Writes 3 times to memory with length of data offset in memory address.
* Then reads 2 times first 2 data written should be read in one read,
* and 3rd write should be read separately.
*
* @author Luka FIlipovic
*
*/
#include "board.h"
#include "log.h"
#include "sram4.h"
static sram4_t sram4;
static log_t logger;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
sram4_cfg_t sram4_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.
sram4_cfg_setup( &sram4_cfg );
SRAM4_MAP_MIKROBUS( sram4_cfg, MIKROBUS_1 );
err_t init_flag = sram4_init( &sram4, &sram4_cfg );
if ( SPI_MASTER_ERROR == init_flag )
{
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
if ( sram4_default_cfg ( &sram4 ) )
{
log_error( &logger, " Default configuration. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
char read_buf[ 100 ] = { 0 };
char click_name[ ] = "SRAM 4";
char company_name[ ] = "MikroE";
char product_name[ ] = " Click board";
static const uint16_t START_ADR = 0x0001;
uint16_t mem_adr = START_ADR;
//Write Data
sram4_memory_write( &sram4, mem_adr, click_name, strlen( click_name ) );
mem_adr += strlen( click_name );
sram4_memory_write( &sram4, mem_adr, product_name, strlen( product_name ) );
mem_adr += strlen( product_name );
sram4_memory_write( &sram4, mem_adr, company_name, strlen( company_name ) );
//Read Data
mem_adr = START_ADR;
sram4_memory_read( &sram4, mem_adr, read_buf, strlen( click_name ) + strlen( product_name ) );
log_printf( &logger, " > Read Data from 0x%.4X memory address: %s\r\n", mem_adr, read_buf );
memset( read_buf, 0, strlen( read_buf ) );
mem_adr += strlen(click_name) + strlen( product_name );
sram4_memory_read( &sram4, mem_adr, read_buf, strlen( company_name ) );
log_printf( &logger, " > Read Data from 0x%.4X memory address: %s\r\n", mem_adr, read_buf );
log_printf( &logger, "**********************************************************************\r\n" );
Delay_ms( 3000 );
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END