The STM32 is the third ARM family by STMicroelectronics. It follows their earlier STR9 family based on the ARM9E core, and STR7 family based on the ARM7TDMI core.
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21 views
STM32-E407 - FSMC
Have anyone any experience of the FSMC of a STM32 E407 chip ? Write speeds, DMA, etc ?
I have an application that needs upto (worst case) 20 MB (thats bytes) / Sec sustained transfer rate from the ...
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42 views
ADC with STM32F3
In the RM0316 reference manual of STM32F302xx, STM32F303xx and STM32F313xx advanced ARM-based 32-bit MCUs i found in the paragraph 12.8 - Dual ADC modes
In devices with two ADCs or more, dual ADC ...
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1answer
31 views
What's the usage of the three boot mode of STM32f103?
If you see in refrence manual of STM32f103, you can see three boot mode for it. well, What's the usage of the three boot mode?
please say to me by example for each mode.
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1answer
48 views
Help for find Camera Datasheet or interface to st32f103
I want to use of S302's Camera(the S302 is a mobile phone with a good camera) and interface it st32f103 but, unfortunately I can't find any datasheet for it. Also, I can find the schematic of Phone ...
6
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1answer
79 views
What's mean these microcontroller pin input/output modes?
I bought an stm32f103ret6. When I saw the reference manual, I saw that it has several I/O modes.
For input: floating, pull-up, pull-down
For output: analog, open-drain, push-pull
I have already ...
2
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1answer
86 views
STM32 GPIO Configuration
I am trying to figure out some online resource to figure out how to configure the GPIO Registers on an STM32F4 Cortex M4 board. I only have examples for the Cortex M4
...
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1answer
43 views
How to overwrite flash memory on STM32L series
I am trying to write a known pattern (ie 0xFFFFFFFF or 0x00000000) on top of already written flash memory, to invalidate portions of it for a primitive file system. But it doesn't work for me on the ...
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2answers
106 views
STM32 crashing to Default_Handler
My STM32F4 Discovery is crashing when I try to run the sin or sinf function with the FPU enabled and with the FPU disabled.
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0answers
89 views
STM32F4 : USB and Virtual Com Port
I tried to use the VCP example from ST's sources. So, I installed the last version of the Virtual Com Port from ST website.
I compile the project on CooCox, no error, no warning. I target the ...
2
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1answer
97 views
STM32F103 low power mode (stop)
I've got a project where I'm trying to get the power consumption down as low as possible (on an STM32F103RCT6).
I looked at ST's document on getting the STM32F2 power consumption down as low as ...
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123 views
ADC STM32F4 : Funky Values
I am confronted to a problem : I test the output ADC's values. I send to PC0 (GPIO_PIN_0 and ADC3 with Channel 10) an signal between 0 and 1 volt -don't consider impedance issue, and it is not a ...
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2answers
230 views
STM32 F4 - ADC in Dual Mode Simultaneously
I am stuying the example from STM32 libraries (ADC_DualModeRegulSimu). I understand how the whole program works but I need some information and I have few questions about this code confronting to my ...
2
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1answer
188 views
STM32 Interrupt Priority (preemption) Problems
I have another problem (High resolution system timer in STM32) which I have tracked down (mostly) to this issue, and have created a test case here for the simplest STM32 processor I could find (on the ...
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2answers
245 views
High resolution system timer in STM32
I have some software running on an STM32F103 (I'd also like to be able to use the F4) where I'd like to be able to 'timestamp' events (such as interrupts on external pins) to the nearest microsecond ...
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3answers
114 views
Problem with pointer on ARM Cortex M4
I am working on a STM32f4 board and I have a problem with passing pointer as input in a function.
I have my main :
float32_t var;
function(&var);
And ...
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116 views
ST-Link and my STM32F051 board not connecting each other
I've designed my first board for an STM32F051.
When I connect the SWD pins to the ST-LINK, it doesn't connect. The STM32 ST-Link Utility says "Internal command error".
I think I have all the ...
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1answer
57 views
STM32f2xx could not work with maximum frequency
I'm using default configuration (according to UM1061, RCC section) to configure an SMT32F215RG to work with 120MHZ CPU clock.
here is my configurations:
...
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0answers
81 views
Run IAR Program without Debugging
I'm having a simple problem with IAR Embedded Workbench, programming an STM32 using an ST-LINK/V2 programmer. I'm trying to run a program that temporarily switches off the JTAG pins, so I can't run it ...
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3answers
178 views
How to stock variables in FLASH memory
I am working with a STM32 eval-board from STMicro which includes a ARM Cortex-M4 processor. I need a LUT for cosinus and sinus (read-only variables). I need to manage my RAM memory therefore I want to ...
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1answer
92 views
How to handle conflicts between reference manual and reference design about ADC of STM32?
On page 207 of stm32 reference manual, it says that VSSA(power supply of ADC, negative) must be tied to VREF-(analog reference, negative). But when I refer to reference design of STM32(Evaluation ...
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0answers
51 views
How start running STM32 firmware from IROM2 in Keil Microvision?
I'm developing an embedded application using Keil MicroVision 4 & STM32F103RE
I've splited Flash memory of device into two areas (IROM1 & IROM2) using IDE target options panel (Target tab, ...
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1answer
146 views
STM32 I2S Interupt Usage
I was trying out a sound experiment, starting off with sample code which sent data to the Discovery F4's audio codec using I2S. The sample code used polling in the main loop and sent data when the ...
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0answers
183 views
STM32 Virtual COM Port example seeing AT+GCAP
I'm running the STM32 Virtual COM Port example from the USB device library on a STM32F103 and connecting to the device using Ubunutu. Looking at the USART port I keep seeing "AT+GCAP" over and over. ...
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0answers
54 views
stm32f2xx HSI configuration does not work correctly
I'm using below settings (in SystemInit function) to configure a STM32F215RG MCU to work at maximum speed (120MHZ) with USB support:
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0answers
80 views
IAR EWARM project doesn't run with STM32 startup file
I'm attempting to test out some basic programs on an STM32L151RD (Cortex-M3) using IAR's Embedded Workbench. I'm using an ST-LINK/V2 programmer. I've downloaded the Standard Peripherals Library and ...
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1answer
145 views
How to realise bidirectional ports in FSMC function of STM32?
I am using FSMC(Flexible static memory controller) function of STM32:reference manual.On page 494 of referencec manual, the data bus should be bidirectional. It is reasonable but i have no idea how to ...
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1answer
69 views
Still struggling with the STM32F051C8T6 bootloader
I've been reading the information available in ST.com about creating a bootloader for a STM32F0xxx microcontroller, and it says the following:
"The bootloader is automatically activated by ...
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0answers
68 views
Burst mode data errors on I2C
I'm using burst mode to read 14 bytes from a sensor via I2C running at 400KHz. The problem is that there are periodic errors on the last byte of the packet, that come in roughly every 8 reads. The ...
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1answer
82 views
Creating a bootloader for STM32F051C8
I need to design the hardware to load my custom programs into a STM32F051C8T6 microcontroller and I'm not sure of which pins should be connected to what and I wouldn't like to do things wrong.
I've ...
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3answers
286 views
How to cut interrupt code to minimum?
I have some interrupt let's say from UART to make a real example:
...
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2answers
207 views
Sending ADC measurements with UART
I want to measure signal with ADC and send measurements to PC to generate plots.
My code:
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1answer
84 views
To get rid of useless redundancy--do I realy need a voltage supervisor?
I am using a voltage supervisor from MAXIAM(MAX7634A). It monitors VCC_3V3 and VCC_-3V3(I use LM358 to make it a positive one).Power supply distribution is shown below:
VCC_3V3:
stm32f103
EMP570T144
...
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1answer
85 views
what is logic contention when using a voltage supervisor?
I am using a voltage supervisor from MAXIAM (MAX6734A).I am confused about design notes in page 11.
so,what is logic contention? the uP that I want to monitor is STM32F103ZET6.I read its ...
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1answer
432 views
Problems with UART on STMF4 Discovery Board
I have some problems with UART comunication. My platform is STM32f4 Discovery Board with STM32f407VG.
First my system setup:
...
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0answers
50 views
Using TLP280-4 with STM32F1xx MCU
This is a continuation of my previous question.
Olin Lathrop explicitly explained me the previous question, but also set thinking on the exact way of connection the optocoupler to a MCU input.
I ...
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1answer
124 views
Clocking scheme for LAN8720A - Cortex M4
This is regarding a design choice involving LAN8720, specific to clocking schemes.
We are interfacing an ARM cortex M4 (with inbuilt MAC) to the 8720 PHY via RMII in the REFCLKO configuration. In the ...
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105 views
Problem running C++ function from STM32's SRAM in Keil microVision
I'm using Keil uVision 4.6 to write a C++ program for SMT32F103RE.
I need to run one of my program functions directly from SRAM, so I devided my SRAM into two separate regions:
...
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3answers
176 views
Using array as global variables in IAR (STM32) [closed]
I have defined a global array in main.c:
__IO uint8_t data[3]={0,0,0};
then, I extern and assign vlues to this array in another c file:
...
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1answer
101 views
IAR errors about extern and global vriables
I want to get values of a global array in a c file. the print screen of code is shown below:
'data' is the global array and 'slave_buffer_rx' is another global array defined in this file to get ...
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1answer
279 views
TLP280-4 Optocoupler on 12/24V inputs
There is a STM32 device which has to detect several signals from other devices. The voltage of these signals can be 12V or 24V. Also these signals can be positive (i.e. 12/24V) or negative (connected ...
1
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1answer
61 views
Difference between Max Interface Clock and Max Timer Clock?
I am trying to use a timer from STM32F4 with ARM Cortex-M4 chip. I need to get the maximum frequency out of that timer for my ...
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0answers
117 views
JLNINK(SWD)+IAR can not debug stm32: communication error
guys. I am using J-link with SWD interface to debug my STM32F103VCT6 in IAR. I can enter download and debug mode but I can not use "step over" or "stop" function. Once I use one of them I will get ...
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2answers
447 views
how can a GPIO of stm32 have many alternative functions?
I am working on the assignments of pins of STM32F103ZET1.
On page 31 of datasheet, it says that PA0 has many alternative functions: ...
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0answers
269 views
stm32f2xx external clock source for timer
I trying to use a timer with an external clock source on a stm32f207ZE microcontroller.
But it isn't working. Here is my code:
...
4
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1answer
210 views
Problem with I2C EEPROM communication
I have a STM32L MCU connected to M24LR64E, an I2C EEPROM. Previously i had this setup working but then i changed some things (layout, firmware) and somehow i screwed the I2C and it is not working now.
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7answers
781 views
I2C slave address not acknowledged (sometimes)
I'm trying to communicate with a remotely connected FRAM (FM24C04 from Ramtron) by using I2C. This memory is embedded on a board that can be inserted and removed at any time to/from the system ...
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1answer
225 views
STM32 program not executing
I am currently trying to make my own stm32 development board. i have stm32f100c4t6 microcontroller mounted on pcb.
I am using Atollic True studio free edition. i had made small blink led program ...
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1answer
171 views
Some general NAND flash questions
I have some questions about nand memories.
Do we need to erase whole block to rewrite only one page?
If true, what is the algorithm? Cache whole block > edit one page > erase whole block > write ...
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1answer
109 views
STM32 and GDB - Watchpoint
I'm reading the book http://www.cs.indiana.edu/~geobrown/book.pdf and I have a question regarding the Exercise 3.1.2 on page 50.
It ask to set a watchpoint on i. I set a watchpoint but it never break ...
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0answers
177 views
How it's possible to determine the output frequency of STM32 without oscilloscope?
I am implementing a frequency meter on my STM32F4, but to do that I need to know exact frequency of the timer fed on GPIO pin.
Is it somehow possible to determine that without using external ...
