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Posted on June 22, 2018 at 08:57Hi,I have a problem with configuring priorities for DMA channels and LTDC controller.I am using a DMA channel to communicate with a DSP processor. In this channel I need a large data transfer. When I start the DMA channel, I get a FIFO Underrun error from the LTDC controller, and the screen blinks very much.How to set up the priorities of DMA channels? I think that priority for LTDC shoud be the highest, but how can i do it ?Regards Grzegorz

Posted on June 07, 2018 at 12:55Hello,I've created new STM32H753IIKx project with CubeMX(Ver4.26.0), and changed the I2C1/I2C2 setting into 'I2C' from 'Disable' in Pinout tab.And, switch to Configuration tab, open the I2C1 Configuration, move to GPIO Settings tab, I can modify the Fast Mode setting to 'Enable' from 'Disable' on each PB8/PB9.However, in the I2C2 Configuration case, I cannot modify the Fast Mode setting that shows 'n/a'.Does this mean that I2C2 cannot be used as Fast Mode ?Is there difference between I2C1 and I2C2 from functionality point of view ?Thanks.Shirane

Posted on June 20, 2018 at 13:46As i had lack of speed while using stm32f407 disco, i ordered stmf746 nucleo-144. And What suprised me was that it is slower then stmf407, despite that stm32f07 168 max mhz, and stmf756 is up to 216Mhz. I configured my code with CUBEMX. Simple test: While(1){HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12, GPIO_PIN_SET);HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12, GPIO_PIN_RESET);}gives me 150ns pulses on STM32F746when the same test gives me 100ns on STM32F407.I used HSE 8mhz external resonator. Aclually clock config were the same for both mcu, except that STM32F746 has 216 mhz max when stmf407 168.So why is that? STM32F746  should be more powerful. Also it was released later#stm32f407 #stm32f746 #external-rc

Posted on December 23, 2017 at 23:31I'm trying and failing to get printf debug to output via SWO on a H743ZI-based Nucleo board. I've added retarget_io.c for STDOUT via ITM Port 0 in my Keil MDK v5.24a based project. I have the ST-LINK/V2 debugger firmware updated to v.2.29. I have trace enabled in the project->debugger settings and have tried all sorts of core clock settings from 400 MHz through 72 MHz to 8MHz. I get no debug printf output. I've also tried the ST-LINK Utility and see nothing via that route either.I'm using the STM32Cube_FW_H7V1.1.0 firmware package and have modified the while (1) loop in main.c of the Examples->GPIO->GPIO_EXTI project to { HAL_Delay(500); printf ('i = %d\n', i++); } For sanity and to confirm the Nucleo 144 board schematic, I built an equivalent project for the F767ZI Nucleo board using the STM32Cube_FW_F7_V1.8.0. I could eventually see SWO printf output when I set the core clock to 72MHz (which is the same speed

Posted on May 29, 2018 at 23:58Dear All,We are designing a product which calculates some of the data based on input configured by user. Once it got configured, software will update the calculated parameters automatically. However to configure and transfer data to external world, we would like to use NFC in our product. Can anyone suggest best part number to do so and is NFC suitable for such information sharing application?This application doesnt require continuous monitoring, This is like once in a year and want to select cheapest technology for the same. Please suggest the same.

Posted on June 15, 2018 at 10:00Hello, I am using TIM2 peripheral and many times f(DTS) is mentioned , what is that ?also what is the purpose of clock division settings ?does it divide the internal clock ? (CLK_INT)#stm32f4 #timer

Posted on June 20, 2018 at 18:00Hi,I'm facing a strange problem due to optimization 0.Actually, my code is working well but when i set optimisation to 'None' the MCU fail in its initialization.The lines concerned are in stm32l4xx_hal_rcc.c line 839.the PLLRDY bit never set, is this a known issue?Felix.

Posted on June 20, 2018 at 01:45I'm trying to use printf to SWO viewer on ST-LINK utility for debugging purposes. I'm using a STM32L062K8, which has a Cortex M0+processor. After much research on the internet, found out that ITM trace is not available on M0+ processors. Which means I can't use any ITM functions as explained http://www.openstm32.org/forumthread2893. I can't find any solution or tutorial on this problem. Is there any work around for this situation?Thank you! 

Posted on June 20, 2018 at 05:50I am using a STM32F303v with 2 ADC regular channels in cotinuous mode with a DMA and would like continuous conversion to take place in order to enable a stream of data.Base on the setup of my DMA and ADC below, I am unable to perform continuous conversion. On further debugging, I found that the very first conversion is successful and then the ADSTART bit is set back to 0. If I manually set ADSTART=1, the conversion starts, DMA does the transfer when it finishes and then ADSTART goes back to 0. Please help.    DMAy_x = DMA1_Channel1;    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)dest;    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;    DMA_InitStructure.DMA_Priority = DMA_Priority_High;    DMA_InitStructure.D

Posted on June 20, 2018 at 10:08Hi, i have uart comm. task. Its priority is osPriorityRealtime(+3)  in task i send datas with interrupt method and in txcallback i change the flag. in data_send im waiting for flag with while. But my program hanging on while. In debug it enteres HAL_UART_TxCpltCallback function and sets flag to TRUE but data_send function still wait in while. When i changed while(flag_u8== FALSE); with osDelay(10); it works. Is it about rtos , task priorty or something like that? UINT8 flag_u8= FALSE;void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart){       if(huart == &huart1)       {             flag_u8= TRUE;       }}void data_send(uint8_t* main_buffer, test_t* test, uint16_t size){      flag_u8= FALSE;       MX_USART1_UAR

Posted on June 19, 2018 at 11:55Hi all,I'm quite new to the embedded stm32 environment so if I'm asking something stupid please forgive me.First of all, my setup. I'm using a NUCLEO-32bit with STM32L432KC, and we need to test some performances on encoders because we have some problems. One of these tests is the one in which I'm stuck. Basically I want to use one of the available TIMx  (TIM2) in Encoder Mode with interrupts, and I've successfully managed to do let's say 80% of the work. The only part that I'm stuck with is the interrupt part: I want to fire an interrupt each time the CNT value changes, and also know the direction of the change (i.e. if my encoder rotates CW, increase a variable, if it rotates ACW i want the variable to decrement).Actually the interrupt fires regularly also when the CNT value of encoder does not changes, so I do not know what I'm doing wrong. And I also experience a strange behaviour of the encoder: also when it is not moved, sometim

Posted on June 19, 2018 at 11:04Our new products have the ST25DV04K on board to identify them. We can read the NFC chip with our android phones. But the ACR122 from ACS doesn't detect the NFC. I tested the ACR122 with the X-NUCLEO-NFC01A1 and the X-NUCLEO-NFC04A1. The first one works fine, but the second one with the ST25 is also not detected by the ACR122.Can you help us with this problem? Thanks#st25dv04k #st25 #acr #acr122 #nfc

Posted on March 09, 2018 at 18:47Dear all,I'm using the Nucelo-144 board with a STM32H743ZI, with the GCC+Makefile toolchain, and am trying to get the RAM in the D2 domain to work.I generated a Makefile-project with CubeMX and added the following to the linker file:/* used by the startup to initialize data */ _siRAM_D2 = LOADADDR(.RAM_D2.data);/* Initialized data sections goes into RAM_D2, load LMA copy after code */ .RAM_D2.data : {    . = ALIGN(4);    _sRAM_D2 = .; /* create a global symbol at data start */    *(.RAM_D2.data) /* .data sections */    *(.RAM_D2.data*) /* .data* sections */   . = ALIGN(4);    _eRAM_D2 = .; /* define a global symbol at data end */ } >RAM_D2 AT> FLASH/* Uninitialized data section */ . = ALIGN(4); .RAM_D2.bss (NOLOAD) : {    /* This is used by the startup in order to initialize the .bss secion */    _sbss_RAM_D2 = .; /* defin

Posted on June 11, 2018 at 12:44Hello everyone?I have an issue with bootLoader development?I have debug the bootLoader successfully with SPC560P44, but I am not quite sure about how to jump to bootloader from the application program?our conventional method is putting the boot function at  the absolute address?and we can jump to bootloader by call the function pointer?but in the SPC5Studio we don't know how to put the function at the absolute address?Can anyone know this ?Appreciate to receive your reply?#bootloader

Posted on June 11, 2018 at 14:55Hello,we've been using the LIS3DH on a development board and have switched to the LIS3DE for the prototype. We're using the HW fifo feature to batch-read values from the sensor. The LIS3DE is only 8-bit and thus I was expecting the HW fifo to only provide 8-bit values, but it seems like it is still sending 2 bytes per axis, is this correct?The reason I'm asking is simply due to the fact that the _L and _H distinction does not exist on the LIS3DE, I'm always reading from register 0x29 (instead of 0x28) and read using auto-increment. In the received data every second value is zero and thus the values are actually signed 16 bit values?What is the correct way to interpret the values? Attached: Buffer as read from LIS using HW fifo feature#fifo-buffer #lis3dh #lis3de

Posted on June 18, 2018 at 11:17In section 10.1 of the datasheet for the LPS22HB the square on top of the package is labelled as 'Sensing area (exposed silicon)', which makes it sound quite fragile.  However I noticed in a recent press release: http://www.st.com/content/st_com/en/about/media-center/press-item.html/t4028.html the LPS22HB is listed as 'Dust-free and water-resistant by design'.  Is this square of silicon the sensing element or a protective cap (how fragile is it?), and is that the same of the LPS25HB?Many thanks.

Posted on June 19, 2018 at 16:39 Dear Sir/Madam: I am using STM32F4x nucleo HAL lib, and try to set timer interrupt. It does not work. Here are the settings for timer interrupt: ..... // Timer is configured to be triggered every .05 secs. __TIM4_CLK_ENABLE(); Tim4Handle.Init.Prescaler = 16400; Tim4Handle.Init.CounterMode = TIM_COUNTERMODE_UP; Tim4Handle.Init.Period = 20; Tim4Handle.Instance = TIM4; Tim4Handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; if ( HAL_TIM_Base_Init(&Tim4Handle) != HAL_OK ) { Error_Handler(); } TIM_SlaveConfigTypeDef sSlaveConfig; TIM_MasterConfigTypeDef sMasterConfig; sSlaveConfig.SlaveMode = TIM_SLAVEMODE_RESET; sSlaveConfig.InputTrigger = TIM_TS_ITR0; if (HAL_TIM_SlaveConfigSynchronization(&Tim4Handle, &sSlaveConfig) != HAL_OK) { Error_Handler(); } sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET; sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE; if (HAL_TIMEx_MasterConfigSynchronizat

Posted on June 19, 2018 at 16:09Hi, i use STM32Cube USB device library ver. V2.2.0. My PC driver send to device vendor cpecifiq request bmRequestType = 0xC0. In UM1734 says: 'The library passes all the non-standard requests to the class-specific code with the callback pdev->pClass->Setup (pdev, req) function.' (5.1.1 -> Non-standard requests -> SETUP stage, p. 18). But realy it is not true. In file usbd_core.c this request is passed to USBD_StdDevReq and handle there as invalid.Tell me please, this is an error in library?#stm32cube-usb-device-library-vendor-request

Posted on June 19, 2018 at 12:26 I am using STM32F103RCT6 to blink a LED which is connected to PA15 - JTDI in PU. My GPIO Configuration is like this GPIOA->CRH |= GPIO_CRH_MODE15; //Output mode, max speed 50 MHz. GPIOA->CRH &= ~GPIO_CRH_CNF15; //General purpose output push-pull\ And I am trying to Blink Like this #define LED_HIGH() (GPIOA->BSRR |= GPIO_BSRR_BR15) //LED High #define LED_LOW() (GPIOA->BSRR |= GPIO_BSRR_BS15) //LED LOW In datasheet it says To free the Pin for GPIO we need to configure SWJ_CFG[2:0] either with 010 or So for that i am configuring AFIO->MAPR |= AFIO_MAPR_SWJ_CFG_1; //((uint32_t)0x02000000) as 010 Datasheet also says we need to do something with ODR/IDR registers but i am not getting correcty how to configure PA15 (or any JTAG pins) as GPIO. The SWJ_CFG in AFIO_MAPR is given as Any suggestion will be helpful. Thank You in advance #blink #stm32 #jtag

Posted on June 19, 2018 at 09:07Hi all,I've started playing around with the NUCLEO-H743ZI to try out the H7 series and I've noticed that toggling GPIO output with BSRR is very slow. I've used CUBE to configure the board for a 400MHz SYSCLK and my main loop just continuously toggles PE0 with BSRR as below:while (1) {    TOGGLE_GPIO_Port->BSRRH = TOGGLE_Pin;    TOGGLE_GPIO_Port->BSRRL = TOGGLE_Pin;    TOGGLE_GPIO_Port->BSRRH = TOGGLE_Pin;    TOGGLE_GPIO_Port->BSRRL = TOGGLE_Pin;}Resulting scope trace attached - the output toggles at 17MHz (blue), which seems extremely slow. For comparison MCO2 set to SYSCLK/10 (yellow) is 40MHz, and TIM1 set to PWM (purple) can output 100MHz. I've checked my GPIO speeds (GPIO_SPEED_FREQ_VERY_HIGH) and my peripheral clocks.Has anyone else observed slow GPIO on the H7? Is there a setting I've missed? Or is there a spec I've missed?For comparison, the same test on my NUC

Posted on June 18, 2018 at 10:20hello ST community,I have a little problem with STM32CubeMX.The problem is, when i generate new code with cubeMX to my existing programm, some of my existing work is not working as intended anymore (here it is my I2C that only returns 255 all the time after the modification). But if i make the modification without CubeMX (copy and past the exact same code) i don't have any problem. I even checked, all the files are the same.Does someone have an idea why this is happening and how to solve this issue ?Thanks for your time.#stmcubemx #st-cube

Posted on June 07, 2018 at 01:45I have a large data buffer stored in external sdram. I'd like to send data to a serial peripheral (uart, spi or iis) directly on a dma transfer. Is it possible to do so?. Every FMC sdram example available move data from sdram to internal ram.Thanks in advance.Tony 

Posted on June 15, 2018 at 17:25I have a M24LR-DISCOVERY development board and installed STSW-95HF001 Ver 2.2.0After installation on Win 7 Pro and running the status bar says 'CR95HF demonstration board not connected, please check it'I have checked that the USB device does not have a driver associated with it, as per device manager etc.en.DM00238010.pdf says 'Driver included through a specific Dll' but this knowledge really doesn't help.What am I missing?#m24lr-discovery

Posted on June 16, 2018 at 22:25Hi friends,The while loop does not work in the following function. Why could it be?For STM32F407VG;void US_BEKLE(uint16_t us){ uint16_t baslangic = (uint16_t)__HAL_TIM_GET_COUNTER(&htim1);while(((uint16_t)__HAL_TIM_GET_COUNTER(&htim1)) - baslangic < us);}htim1.Instance = TIM1; htim1.Init.Prescaler = 167; htim1.Init.CounterMode = TIM_COUNTERMODE_UP; htim1.Init.Period = 65000; htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1; htim1.Init.RepetitionCounter = 0;#microsecond-timer #while-loop

Posted on June 16, 2018 at 16:35 I've been trying to connect USART_1 with bluetooth hc-05 for the past few days, andI am unable to do so. The Microcontroller I am using is nucleo STM32F103RB. Here's the code (I am not using any library) #define APB2_FREQ 72000000 void USART1_Send(char* data) { unsigned int length = 0; while(data[length] != '\0') ++length; int i = 0; while(i < length) { USART1_DR = data[i]; while((USART1_SR & 0x00000080) == 0); // wait if transmit data register is not empty ++i; } } char USART1_Receive() { while((USART1_SR & 0x00000020) == 0); //wait for data to arrive return USART1_DR; } void USART1_Init(int baudrate, short parity, short stop) { RCC_APB2ENR |= 0x00004004; // enable Port A, enable usart1 clock GPIOA_CRH &= 0xFFFFF00F; GPIOA_CRH |= 0x000004A0; // pin 9 = alternate function push-pull, pin 10 = Floating Input USART1_CR1 &= 0x00000000; // clear CR1 register and 'M bit' to 0(which is 8 bit data) if(parity == 1) // even parity