stm32f4 tft lcd example price

Ahh yeah look at that! If you look closely, top right of the LCD, that’s obviously a flex connector for a resistive touch overlay (4 contacts running to the 4 sides of the LCD overlay).

Agreed! I will be picking one up. I’ve been happy developing for the stm32f4discovery (and other stm32 chips) with gcc, openocd and gdb. It is all free.

The STM32F4 cores are pretty well supported by libopencm3 and Code Sourcery and summon-arm-toolchain both build working toolchains and openOCD supports the stlink natively now.

A fair number of inexpensive baseboards/motherboards/accessories have also appeared for earlier versions. I hope Olimex puts out a couple nice STM32F429/427 boards.

I can see there is only a STLINK usb connector on board, so there is even no FS to expect. beside HS, I suppose does mean High Speed (480mbps). but HS anyway needs a separate physical layer USB chip for addition to STM32F4 chip and most likely this is chip is not present on this board anyway, because this is STM32F4+LCD+SDRAM demoboard and there is no need for USB at all.

The data brief bullet-points “USB OTG with micro-AB connector”. Looks like the micro-usb is on the underside, sticking out at the bottom of the photo. With matching T/H mounting tabs on the topside, labelled USB USER. But like you said, the STM32F4 requires an external PHY for HS, and it seems unlikely they’d include one on this board.

I think Farnell’s 21€ will be accurate, as ST’s suggested USD price is $24. The placeholders for the STM32F429I-DISCO on element14 (a division of Farnell) and mouser show $42, which I think predates the later ST announcement. I think the ST announced $24 will hold, and the distributor prices will match that, as they have in the past.

I wouldn’t expect TI to hack profits from their calculator range, and HP have always been expensive, but ST could easily change their format to calculator-friendly. Clamshell design, LCD & battery in top half, CPU & keypad in bottom half, expansion pins to left / right of keypad makes a self contained unit.

HP Palm – Love the idea, hate the baguette (french bread loaf) layout. If I could get custom key covers, and surface-mount key switches, I’d be designing my own low-profile keypad to go with an LCD module. Top side keypad, bottom side CPU / RAM / USB / LCD driver / power regulation / expansion port.

Great find, thanks! Man, could they have buried the details on that guy any farther down into the document? I can’t help but feel like a quick pointer in the LCD section to “oh by the way there’s a touch screen, here’s how to talk to it” would have been a good idea.

It’s certainly useable in any other project where you have an onboard LCD controller. Especially any other project that happens to use a STM32F4. What difference would it have made if it had an external controller? Surely it’d have been on the same PCB. Were you hoping for a removeable SPI-interfaced module?

Look in the UM1670 user manual, paragraph 4.8: the tft includes an ILI9341 controller. The ILI9341 has it’s own graphics ram inside, it is not mapped into the STM32 address space. It is connected to the STM32 via a parallel bus. The ILI9341 and similar controllers are common on cheap chinese tfts. So it is no problem to source similar tfts for your final product after developing on the discovery board.

UM1670 in paragraph 4.8 also says that “The TFT LCD is a 2.41″ display of 262 K colors. Its definition is QVGA (240 x 320 dots) and is directly driven by the STM32F429ZIT6 using the RGB protocol”. ILI9341 has multiple modes of operation including direct RGB/HSYNC/VSYNC mode which bypasses internal GRAM. I don’t have the board yet but I assume display buffer is located in external SDRAM which is also on the board. The whole point of this kit is to show TFT and SDRAM interface in new STM32F4x9.

I’ve checked this discovery board firmware available from ST’s site (“STM32F429 discovery firmware package UM1662” number: STSW-STM32138, btw. finding it is a bit difficult – ST’s site is terrible):

They are using FreeRTOS, FatFs, STemWinLibrary which is ST’s version of Segger’s emWin graphic library and STM32F4xx_StdPeriph_Driver v1.2.1 which includes F429/439 support (FMC, LTDC and DMA2D added).

Check again martin. Those lines have pullups to vdd and are connected to cpu pins. I have this board for some time and I can confirm that lcd is driven by lcd controller from cpu and frame buffer is in external dram which is also on the board.

This tutorial shows you how to display string, color and dynamic value on LCD with STM32-Nucleo development board from ground up. It will also show you how to read the technical datasheet of LCD. If you are interested in more advance topic of RTOS from scratch, please go to Real-Time Operating Systems tutorial.

You can think of it as a tiny and simplify PC without monitor(output), keyboard(input), and mouse(input). The LCD acts as output and the Potentiometer acts as input in our tutorial. There is a big problem, how can this tiny PC communicate with the outside world (such as monitor or keyboard)? Some use wired or wireless.

In this tutorial, we will use SPI (Serial Peripheral Interface) to communicate with the output device ~ LCD. We call our Nucleo board as master and the LCD as slave because we are sending order and command to the LCD. Sparkfun has a great tutorial website about SPI (link). The image in the following shows the relationship and connection between master and slave.(image from Sparkfun with some modification to fit our case)

We want to display some string or color on the specific location of the LCD. We can achieve this by sending data to the specific address of RAM (Memory) in the LCD board. This is call Memory to Display Address Mapping. Take the image below for example. We want to make the top left corner of the LCD display a yellow square. First, you need to let the LCD knows at where of the RAM are you going to write the data to (using X_start, X_end, Y_start, Y_end value). Then you can start writing the data (color information) to those address of the RAM. Then, the specified portion of LCD will change it"s color according to the value you wirte into the address in the RAM. (Please refer to the ST7735s datasheet page 59 ~ 72)

We will talk about how to connect these two devices by wires later. Let"s see the protocol when communicating to the LCD board. First look at the graphic explanation below.

Command: You use the low voltage from the GPIO pin to tell the LCD board that you are transmitting the command. (Please refer to the ST7735s datasheet page 36 ~ 51)

Click File --> New Project --> In the search, key in your board model (STM32f411RE in our case) --> Click on the NUCLEO-F411RE --> Double click the item --> Click Yes to initialize all peripherals with their default Mode. --> Clear all Pinout.

You may wonder what pin of SPI should I use (you see we change the pin from the default PA5~7). Actually, ARM Cortex-M4 defined the combination of pins with SPI, I2C, UART. You can check the table from the STM32F411RE User Manual page 47 ~ 52. In the table, you can see we are using the combination of PB3/PB5, that combination also legit.

After you connect these devices, connect USB with the PC and Nucleo-64 board. Your PC should be able to detect the Nucleo board and the LED light near the Mini usb port should be steady red ligh. The LCD should be power on with white screen.

In the main function will be like the following. We read the value from the ADC (Analog to Digital Conversion) and this value would change if you tune the potentiometer. The plotData function will take this value and plot it on the LCD.

Before starting to display anything on the LCD, we need to initialize and configure the LCD by sending some command and parameters (data) to the LCD board. This initialization only need to be processed once. After that, we can send data to the LCD with correct protocol.

Let"s make the uper left corner of the LCD become green. In the following sending command as well as sending data, we all communicate via SPI. Remember that before sending data, we need to set the RS (Data or command) pin high. We set the RS pin low before sending command.

The reason of making this tutorial is that the code provided from instructor of the Udemy course is not working at all and the instructor didn"t reply to any student at all. I start from knowing nothing about SPI no need to say the LCD board. After 5 days of research, reading documentation, and trial and error, I finally make it works. This tutorial is to guide those people who want to get a deep knowledge of making a driver to display on LCD.

The STM32F429 Discovery helps you to discover the high-performance microcontrollers of the STM32 F4 series and to develop your applications easily. It offers everything required for beginners and experienced users to get started quickly.

Based on the STM32F429ZIT6, it includes an ST-LINK/V2 embedded debug tool, a 2.4" QVGA TFT LCD, an external SDRAM of 64 Mbits, a gyroscope ST MEMs, a USB OTG micro-AB connector, LEDs and pushbuttons.

A large number of free ready-to-run application firmware examples are available on www.st.com/stm32f4-discovery to support quick evaluation and development.

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High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI

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High-performance advanced line, ARM Cortex-M4 core with DSP and FPU, 1 Mbyte Flash, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI

High-performance advanced line, ARM Cortex-M4 core with DSP and FPU, 1 Mbyte Flash, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI

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High-performance advanced line, ARM Cortex-M4 core with DSP and FPU, 2 Mbytes Flash, 180 MHz CPU, ART Accelerator, FMC with SDRAM, Dual QSPI, TFT,MIPI-DSI

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High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 512 Kbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 512 Kbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 512 Kbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, Dual QSPI, TFT, MIPI-DSI

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 512 Kbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 512 Kbytes of Flash memory, 180 MHz CPU, ART Accelerateur, Chrom-ART Accelerator, FMC with SDRAM, TFT

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High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 512 Kbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 512 Kbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FSMC, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ARTAccelerator, FMC with SDRAM, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FSMC, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 1 Mbyte of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FSMC, TFT, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FMC with SDRAM, TFT, HW crypto

High-performance advanced line, Arm Cortex-M4 core with DSP and FPU, 2 Mbytes of Flash memory, 180 MHz CPU, ART Accelerator, Chrom-ART Accelerator, FSMC, TFT, HW crypto

LVDS displays can vary a lot. LVDS displays are not governed by a set of well defined rules like MIPI DSI displays are. Therefore, it is up to the LCD manufacturer and the LVDS display driver IC manufacturer to use LVDS interface as they please, as long as they follow the physical interface and logic levels.

Based on this data, we can pick an LVDS transmitter IC. SN75LVDS84 from Texas Instruments is great for use with LCD displays that can be driven by an STM32.

I have tried to compile the example file GxTFT_FSMC_BlackSTM32F407V.ino. The necessary assisting files should be in place including STM32GENERIC in the hardware folder. After having worked for quite some time Arduino IDE stops with an error message. I list the last page of the verbose output:

"C:\Users\Peas\AppData\Local\Arduino15\packages\arduino\tools\arm-none-eabi-gcc\4.8.3-2014q1/bin/arm-none-eabi-g++" -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -DF_CPU=168000000L -mthumb -DSTM32GENERIC -DRAM_LENGTH=131072 -DFLASH_LENGTH=524288 -c -g -Os -w -std=gnu++11 -ffunction-sections -fdata-sections -nostdlib -fno-threadsafe-statics --param max-inline-insns-single=500 -fno-rtti -fno-exceptions -Dprintf=iprintf -MMD -DSTM32F4 -DARDUINO=10807 -DARDUINO_BLACK_F407VE -DARDUINO_ARCH_STM32 -DSTM32F407VE -DHSE_VALUE=8000000 -DMENU_SERIAL_AUTO=SerialUSB "-IC:\Users\Peas\Documents\Arduino\hardware\STM32GENERIC-master\STM32\cores\arduino/stm32" "-IC:\Users\Peas\Documents\Arduino\hardware\STM32GENERIC-master\STM32\cores\arduino/usb" "-IC:\Users\Peas\Documents\Arduino\hardware\STM32GENERIC-master\STM32\system/CMSIS" "-IC:\Users\Peas\Documents\Arduino\hardware\STM32GENERIC-master\STM32\system/STM32F4/CMSIS_Inc" "-IC:\Users\Peas\Documents\Arduino\hardware\STM32GENERIC-master\STM32\system/STM32F4/CMSIS_Src" "-IC:\Users\Peas\Documents\Arduino\hardware\STM32GENERIC-master\STM32\system/STM32F4/HAL_Inc" "-IC:\Users\Peas\Documents\Arduino\hardware\STM32GENERIC-master\STM32\system/STM32F4/HAL_Src" "-IC:\Users\Peas\Documents\Arduino\hardware\STM32GENERIC-master\STM32\system/STM32F4/stm32_chip" "-IC:\Users\Peas\Documents\Arduino\hardware\STM32GENERIC-master\STM32\cores\arduino" "-IC:\Users\Peas\Documents\Arduino\hardware\STM32GENERIC-master\STM32\variants\BLACK_F407VE" "-IC:\Users\Peas\Documents\Arduino\libraries\GxTFT\src" "-IC:\Users\Peas\Documents\Arduino\hardware\STM32GENERIC-master\STM32\libraries\SPI\src" "-IC:\Users\Peas\Documents\Arduino\libraries\Adafruit_GFX_Library" "-IC:\Users\Peas\Documents\Arduino\hardware\STM32GENERIC-master\STM32\libraries\stm32_dma\src" "C:\Users\Peas\Documents\Arduino\libraries\GxTFT\src\GxIO\STM32GENERIC\GxIO_STM32F407ZGM4_FSMC\GxIO_STM32F407ZGM4_FSMC.cpp" -o "C:\Users\Peas\AppData\Local\Temp\arduino_build_724464\libraries\GxTFT\GxIO\STM32GENERIC\GxIO_STM32F407ZGM4_FSMC\GxIO_STM32F407ZGM4_FSMC.cpp.o"

C:\Users\Peas\Documents\Arduino\libraries\GxTFT\src\GxIO\STM32GENERIC\GxIO_STM32F407ZGM4_FSMC\GxIO_STM32F407ZGM4_FSMC.cpp: In constructor "GxIO_STM32F407ZGM4_FSMC::GxIO_STM32F407ZGM4_FSMC(bool)":

C:\Users\Peas\Documents\Arduino\libraries\GxTFT\src\GxIO\STM32GENERIC\GxIO_STM32F407ZGM4_FSMC\GxIO_STM32F407ZGM4_FSMC.cpp:97:11: error: "PG12" was not declared in this scope

C:\Users\Peas\Documents\Arduino\libraries\GxTFT\src\GxIO\STM32GENERIC\GxIO_STM32F407ZGM4_FSMC\GxIO_STM32F407ZGM4_FSMC.cpp:98:11: error: "PG0" was not declared in this scope

TFT stands for thin-film-transistor and is a variant of LCD displays with an active matrix. LCD-TFTs are widely used in embedded products as they are available in many different resolutions, sizes, interfaces, price ranges, etc.

Some variants of TFT-LCDs are TN and IPS panels. Examples of IPS TFT-LCDs, is the STM32F769 DISCO and STM32H747 DISCO, both running a 800*480 MIPI-DSI TFT IPS LCD display.

eInk displays are low color displays, ideal for applications with low power consumption needs, wide viewing angles, and easy readability. TouchGFX Implementer SDATAWAY demonstrates an eInk display running an TouchGFX application on a STM32F412 here: https://www.touchgfx.com/cases/e-ink/

TouchGFX can use any display interface, and STM32 microcontrollers offer a wide range of display interfaces connecting to Motorola 6800, Intel 8080, SPI, RGB-TFT, and MIPI-DSI.Interface# of pinsTarget resolutionsMax bandwidthBenefitsDisadvantagesSPI4*Up to 480*27216 MHzSimple hardware interface, faster than I2C,

RGB-TFT (LTDC)8/18/24*Up to 1280*800High performance, low costHigh pin count, parallel communication can cause EMC issues, can require higher clock freq

Pixel density defines how many pixels are shown per inch or square inch. Choosing the right pixel density can depend on the expectations from the end user, environment, design needs etc. Putting this into perspective, a high-end mobile phone runs a 6.1” 2340x1080 with a pixel density per square inch of 178,500, while a commonly used 5” TFT display running 800x480 has 34.816 Pixels per square inch.

For some applications it can be difficult seeing any difference, unless the display is being looked at very closely. Examples of pixels densities are: STM32F476DISCO with 16,462 PPI2 and STM32F769DISCO with 54,400 PPI2.

The dynamic color range is the ratio between two contrasting colors, like black and white. In the example above, the blue and white contains different levels of white and blue. The image on the left has lower pixel density, and the picture on the right has more pixels to show all the colors represented, creating a smoother transition between different colors and edges.

There are different touch technologies available in the market today and some examples are: resistive, capacitive (surface, projected), SAW touch, infrared touch. This section will only address some of these technologies:

The new 180MHz STM32F429/439 series extends the STM32 family’s performance lead among Cortex-M microcontrollers while new production and design techniques have reduced STOP-mode current, enabling longer battery life in portable applications. In addition, the STM32F429/39 has new features such as a TFT-LCD controller, ST Chrom-ART Accelerator™ for faster graphics, and SDRAM interface, allowing user interfaces for applications such as smart meters, small appliances and industrial and healthcare devices to provide richer, more colorful content and more intuitive operation.

“Our STM32 series has established another important new benchmark with the arrival of the STM32F429/39 series,” said Michel Buffa, General Manager, Microcontroller Division, STMicroelectronics.” We are delighted, also, to complete our work with SEGGER to deliver STemWin for high-quality graphics development. The timing is perfect for our customers to take full advantage of the new STM32F429/39 features.”

“We are also entering full production with the STM32F427/437 series first revealed in November 2012,” continued Buffa. “These devices deliver high core performance and industry-leading memory density to support feature-rich apps and powerful software environments.”

The STM32F429/39 are now sampling to lead customers and are available in the established LQFP100, LQFP144, WLCSP, LQFP176 and UFBGA176 packages. In addition, ST has introduced two new package options with more than 200 pins - the LQFP208 and TFBGA216 packages that provide extra I/Os allowing designers to maximize the extra performance and functionality of these new devices.

Budgetary pricing is from $7.60 for the STM32F429VGT6 with 1MByte Flash and 256KByte SRAM in LQFP100 package, to $10.23 for the STM32F439BIT6 with 2MByte Flash, 256KByte RAM and crypto/Hash processor in LQFP208 package. All prices are for orders of 10,000 pieces per year.

The latest 180MHz version of the ARM Cortex-M4 core, featured in the STM32F429/39 series, allows customers currently using a microcontroller and discrete entry-level or mid-range DSP to replace or combine both chips in one digital signal controller based on a standard core. The combination also delivers high energy efficiency and access to the powerful development ecosystem supporting the STM32. The ARM Cortex-M4 core in ST’s STM32F4 variants is further enhanced with ST’s Adaptive Real-Time (ART) Accelerator. The ART Accelerator achieves zero-wait execution from Flash and achieves 225DMIPS (Dhrystone MIPS) and 606 Coremark (EEMBC Coremark benchmark) scores using industry-standard performance metrics.

By also providing designers with up to 2MByte Flash or 1MByte dual-bank Flash, each with 256KByte RAM - STM32F429/39 devices allow embedded systems to use sophisticated platforms such as Microsoft .NET, Java or uC Linux, whereas embedded designers have historically been limited to a structured language such as C. This approach enables developers to build more feature-rich applications, delivering enhanced user experiences, more quickly and efficiently. Devices with dual-bank Flash permit read-while-write operations which can help protect memory contents, for example by allowing an application to run normally while an update is downloaded to be applied safely at a later time.

The enhanced display controller now provided on-chip allows the application to be connected to a standard TFT-LCD while benefiting from the low cost, physical size and real-time effectiveness of a microcontroller-based system. The on-chip TFT-LCD controller features ST’s Chrom-ART Accelerator, a hardware block for faster graphics processing, which is capable of doubling pixel-format conversion and transfer throughput compared to running software on the Cortex-M4 core. Developers can also take advantage of typical microcontroller on-chip features such as embedded reset capability and voltage regulators, as well as rich connectivity peripherals and integrated memories. The STM32F429/39 series also delivers freedom from high power consumption, external memory components and the non-deterministic behavior of an operating system, which are typical of MPU-based designs.

By providing state-of-the-art I2S TDM (Inter-IC Sound Time Division Multiplex) digital audio connectivity, the STM32F429/39 supports multi-channel audio designs, whereas earlier microcontrollers have typically supported only the dual-channel I2S standard.

Security and cryptographic capabilities are also enhanced. Whereas STM32F21x and STM32F41x series offered SHA-1 support as part of the hardware cryptographic and hash co-processor, the STM32F437 and STM32F439 now add SHA-2 support as well as AES GCM (AES Galois/Counter Mode) and CCM (Combined Cipher Machine). In addition, the STM32F439 offers advanced memory protection, allowing restricted execution-only access to Flash memory sectors. These new memory-protection features help software-IP providers, customers and silicon providers protect firmware against illegal copying.

Even with the increased core performance, the STM32F429/39 series has low current down to 100µA (typical) in STOP mode. This is around one-third the STOP current of the existing STM32 F2 and STM32 F4 devices, and is achieved through ST’s advanced 90nm fabrication process and new design techniques. Customers looking for both high-performance capability in RUN mode and low power in STOP mode now have a solution.

With the STM32F427/37 and STM32F429/39 families at the high end, ST’s STM32 microcontroller portfolio extends from entry-level STM32 F0 devices leveraging the Cortex-M0 32-bit core, through ultra low-power, mainstream and high-performance STM32 L1, F1 and F2 variants featuring the Cortex-M3 core, to the latest Cortex-M4 STM32 F3 and F4 mixed-signal and high-performance microcontrollers with DSP and Floating-Point Unit (FPU). All benefit from ST’s low-power process technology.