STM8 MCUs

Posted on January 15, 2018 at 19:53 Hi folks, I'm having an issue with the TIM2 interrupt firing as soon as I start the timer rather than when the timer overflows -- was hoping someone could help me. I've set up TIM2 to interrupt once every 860 milliseconds or so, but am finding that the timer immediately interrupts about 75 microseconds after I activate it. I'm using the ST peripheral driver library for the STM8S on the STM8s Value Line Discovery board with IAR as the compiler. Initialization code (slightly modified for clarity): Note, timer_period = 836 void timebase_init(uint16_t timer_period) { /* Set the step time TIM2 Clock = 16 Mhz TIM2 Prescaler = 16384 TIM2 Counter Clock = 16 MHz / 16384 = 967 Hz TIM2 Period range = 0.001 sec - 1 sec */ GPIO_WriteLow(GPIOD, GPIO_PIN_2); // For testing with logic analyzer

Posted on October 18, 2017 at 15:06Hello.  I'm trying to develop for STM8 one simple but correct program. But I can not find an answer to one important question. Please explain the behavior of the interrupt system in the following situation. In the errata sheet (DocID17140 Rev 5, Section 2.1.3), a workaround for the abnormal behavior of the interrupt system was suggested. However, this requires that at least one interrupt handler instruction be guaranteed executed. Otherwise, the process of nested interrupt will start, which can lead to program crash. I would also like to clarify what is meant by the phrase ' interrupt is cleared or masked when the context saving has already started'? Means this the interruption of the interrupt request logic signal and the arrival of a new request with a different interrupt  level, or something else?  I ask you to explain, in the same way, the behavior of the interrupt s

Posted on January 13, 2018 at 17:34Hello, I would like to ask about difference between update and overflow interrupt on STM8.For Example, on Timer2://F_CPU 1Mhz//Timer2 - 16bit, max value = 65535TIM2_TimeBaseInit(TIM2_PRESCALER_1, 999);As I understand:1. Overflow interrupt will occur after counting to max value of timer = 655362. Update interrupt will occur after counting to value 999 Is it right?

Posted on December 23, 2017 at 21:41Hello Friends. When i copy my stm8 project that made by STVD and COSMIC Compiler to another place the goto definition and search doesn't work. please help me.

Posted on January 12, 2018 at 09:23Hello everyone,I need help from all the MCU expert out there.I want to download the bootloader code and the firmware code of the STM8s207CBT6 microcontroller. My target (the microcontroller)'s Data-EEPROM, Bootloader, and Flash firmware program have already been programmed. I want to re-program the Bootloader and the firmware code only. The Data in the Data-EEPROM should remain as it is. I am using the commandline stmflashloader to 'download' the bootloader and the firmware code. The following are the commands I am using:stmflashloader.exe -c --pn 1 --br 115200 --db 8 --pr EVEN --sb 1 --ec OFF --to 2000 -i STM8_128K -d --fn 'Bootloader.s19' --v -r --a 8000stmflashloader.exe -c --pn 1 --br 115200 --db 8 --pr EVEN --sb 1 --ec OFF --to 2000 -i STM8_128K(user-bootloader) -d --fn 'firmware.s19' --vThey works.My concern is,1. do I need to use the -e (to erase the memory) in the

Posted on January 10, 2018 at 07:18Hello  i am beginner , i do not know how to write interrupt function in IAR for stm8s003f3  please help me

Posted on February 15, 2017 at 09:56Hi,for my project I use external port interrupt. When it come, I have to do an ADC conversion. The interrupt come every 5 us....is it possible to have an ADC conversion after interrupt every 5us?I'm using discovery kit with STM8S003K3 MCU for test my software. Can I use the stm8s library? Because from my last test I see that  interrupt can not pass 15us....do you have some advice?Thank you.Paolo#stm8-discovery #stm8 #adc #interrupt

Posted on January 09, 2018 at 14:063rd Feb talk on The free toolchain for the STM8 at FOSDEM in Brussels At FOSDEM 2018, there will be a talk on 'The free toolchain for the STM8' in the 'Embedded, mobile and automotive devroom'.The talk in the will be 2018-02-03 11:00 in room UD2.218A at the Universit� libre de Bruxelles.There has been a lot of recent progress, from the speed optimizations in SDCC to the on-target-debugging support via OpenOCD and GDB.I will also be around for discussions during that weekend.More details on the talk can be found at:https://community.st.com/external-link.jspa?url=https%3A%2F%2Ffosdem.org%2F2018%2Fschedule%2Fevent%2Fthe_free_toolchain_for_the_stm8%2FPhilipp#sdcc #open-source #openocd

Posted on January 09, 2018 at 08:25Hello community,i got a problem when i want to create on my stm8 eval board a pwm signal with 350khz and variable duty cycle from 0-100.i calculate the the values for the registers as follows:PWM Frequency = Clock of the Timer without Prescaler (16Mhz) / ARR +1 --> i choosed for arr 44 so i get apprx. 355kHzBut know i can not achieve the desired pwm resolution of 100, now i have 45 steps instead of 100.Did you guys know how to solve this problem?Thanks a lot

Posted on September 09, 2015 at 14:35hello, what are the places where we can buy STM8 micro controllers in india? i dont see them available in retail shops. one place where i can get is from element14 through online, but it is costly. please share if you know any place.thanksPS: sorry, if i had put this post in the wrong place. #stm8 #india

Posted on January 05, 2018 at 20:00Measuring three phase using ADC Hello everyone, I have a problem with measuring ADC.I am building a  device with the ESP8266 + STM8S003F3P6 module which will have 3x230V network voltage measurement and transmission results + device control.Generally, I managed to start everything, but I have a problem with the measurement of 230V mains voltage.On the attached diagram I presented three input circuits - on each of them I can not correctly measure voltages - during debugging the adc reading jumps all the time from 0 to 1023 (max), and in general I can not get anything meaningful. I do read the adc by scanning all inputs (Scan mode), and it's probably ok here, because the signal from the potentiometer reads perfectly.The best effects I had using the system 1 - but the voltage ratio is not linear - is it possible for a diode? Perhaps the problem is the power supply? Perha

Posted on January 03, 2018 at 23:20stm8s103f2 is not able to program hex my product's board is based on stm8s003f3 mcu(TSSOP 20pin), but there was some problem in providing the chipset,so I bought stm8s103f2 TSSOP20pin instead of buying stm8s003f3.The problem was started in that point, I can not program our product hex(firmware) to stm8s103f2, I know it has 4kbytes flash comparing stm8s003f2 has 8kbytes, but our hex file size is under 4kbytes,When programming it by using STVP and ST-Link/v2 SWIM, always come up the pop-up message 'The device is protected'. I used option byte to solve it but nothing is effect.(the board always works good on stm8s003f3)How to solve this problem?, is it not compatible stm8s103f2 and stm8s003f3?My capture image and schematic, mcu picture is attached. please help me.#stm8s103f2 #stm8s003f3 #stvp #swim

Posted on January 04, 2018 at 13:40Hello community,i try to programm an code for my experimentation and i have a problem .. my code should change the duty cycle ie. the value of CCR2_V if the value of Convertion_Value_Current exceeds or is below a specific value .. as a result i want to see on the oscilloscope a changing pwm but it is still with the same duty cycle as defined in the main (CCR2_V=27)the idea was to increment or decrement the value of the register, but it does not working. Have you any ideas where the problem can be?ThanksBG&sharpinclude <stm8s.h>&sharpinclude <stm8s_eval_lcd.h>&sharpinclude <stdio.h>uint8_t StrName[16]={0};uint16_t Conversion_Value = 0;float Stufe = 0.00488;float Nominal_Min = 3.500;float Nominal_Max = 4.500;float Conversion_Value_Current  = 0;uint16_t CCR2_Val = 27 ;u

Posted on December 20, 2017 at 09:58HelloI have developed a timer cum frequency meter using STM8S003F3P6 microcontroller. Interfacing a LCD to show the frequency and time. And also reading a remote switch (PLC realy switch), accordingly controlling(switching) an external driver board of a generator.But the source code inside the micro controller is corrupting after several cycles of switching and the system becomes dead.   After reprogramming the micro controller the system works normally.Please guide me.... what could be the issue here?programmer level fault or hardware level fault or any other ?what I have to do to resolve this issue?

Posted on January 02, 2018 at 10:04The original post was too long to process during our migration. Please click on the attachment to read the original post.

Posted on December 15, 2017 at 08:22HiI would like to use open-drain mode for PB5 pin of STM8S001J3.GPIO_DeInit(GPIOA);GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_OD_LOW_FAST);I do not know why the voltage goes down even if I set it like the code above.Input voltage : 6V PB5 output voltage: 4V is output.#stm8

Posted on July 20, 2010 at 07:08Here is a FORTH interpreter-compiler for Discovery Board.  It is in the form of an assembly file stm8ef.asm.  You can assemble it on STVD and download it to Discovery.  You need a UART connection to Hyperterminal on PC to interact with STM8S microcontroller. If you are lucky enough, or persist enough to get it going, the whole Hyperterminal project will be reduced to 6 lines of FORTH code:  1 500F C! ; turn off LED  0 500F C! ; turn on LED  3E 50F3 C! ; turn on 1 KHz beep  7E 50F3 C! ; turn on 2 KHz beep FE 50F3 C! ; turn on 4 KHz beep 1E 50F3 C! ; turn off beep This is how microcontrollers are to be used. Good luck, Ting. 

Posted on December 29, 2017 at 10:16I got a Nucleo F302R8 on hand, but now a STM8S003F3 is used on my project, i'm wondering if the STLINK on the Nucleo board can be used to debug the STM8S processor? and how should they be connected?Any comments are appreciated!Many thanks!

Posted on December 27, 2017 at 13:32HelloI bought stm8s003f2 mcu instead of stm8s003f3.The seller told me that it is same as stm8s003f3, after getting it, i tested stm8s003f2 on my custom board by using stlink/v2, but it is not works and there is no way to program my firmware. it always pop up the “ the device is protected� message.So I found stm8s003f2 is not exist on datasheet, there is no stm8s003f2 as part number. is it exist? i want get official reply from ST, is it possible?

Posted on December 30, 2017 at 02:08Hi,Please, could someone help me to setup TIM1 to count pulses at rising edges? I try this code, but doesn't works.TIM1_DeInit();TIM1_TimeBaseInit(0, TIM1_COUNTERMODE_UP, 581, 0); TIM1_ICInit(TIM1_CHANNEL_1, TIM1_ICPOLARITY_RISING, TIM1_ICSELECTION_DIRECTTI,  TIM1_ICPSC_DIV1, 0x00);TIM1_TIxExternalClockConfig (TIM1_TIXEXTERNALCLK1SOURCE_TI1ED, TIM1_ICPOLARITY_RISING, 0);TIM1_ClearFlag(TIM1_FLAG_CC1 | TIM1_FLAG_UPDATE);TIM1_Cmd(ENABLE);

Posted on October 31, 2017 at 04:04HiI am using STM8S001J3 controller on my project and I'm have some problem about it,5,6 pin GPIOB It doesn't work.I don't know how to solve it. Please help me..// my source codeGPIO_DeInit(GPIOB);GPIO_Init(GOIOB, GPIO_PIN_ALL, GPIO_MODE_OUT_OD_HIZ_SLOW)while(1){     GPIO_Write(GPIOB, 0x30);}I am using STVD and IAR for program development. Thanks in advance.#stm8 #gpio

Posted on December 20, 2017 at 13:45Hello,We are using sample code for Flash program with 16MHz clock.while testing we found that, for 1byte writing or 1byte erasing time consumed is 5.391ms,which is huge for our application.we are providing snap which we observed in scope.Please guide us to reduce time consumption for 1byte write, and 1byte erase as well as for 1byte read.We are looking forward for your response.Thanks in advance. Siva Sankar Chandika.

Posted on December 20, 2017 at 13:30Hello,we are using the sample code provided by ST for Flash EEPROM programming.We are using 16MHz clock as output

Posted on December 20, 2017 at 11:17I am working on STM8L051F3 and measuring 10K pot output voltage but ADC readings are fluctuating. Pot output is 0 volt but ADC readings is 1 to 4. How to get stable readings?I was measuring temperature using PT100. I am getting 2.6mv change for every �c. I want to detect this change. So i decided to go for 12bit ADC but ADC readings are fluctuating a lot. I tried Averaging but still same result.#stm8l051f3-adc-readings-fluctuation

Posted on December 17, 2017 at 21:26I want to use stm8 mcu for electrical relay such as trip relay and must pass the esd and emc test . Which one is better to use for this subject ?I thought stm8a should be better because it will be used in automotive systems , but after reading datasheet of stm8s003f3p6 and stm8af6223It seems esd maximum rating of stm8s003f3p6 is better than stm8af6223 , so what is advantage of  stm8a  with respect to stm8s ?Thanks a lot AO