STM8 MCUs

Posted on February 03, 2014 at 12:57Hello,I am having issues writing data into EEPROM of Stm8s003K3. I am using Stm8s Discovery development board and IAR IDE.I know the algorithm of unlocking the eeprom.I have attached the code I am using. The problem is that eeprom is behaving in unpredictable way. Sometimes the data is written and sometimes it isn't.Please provide me a reasonable answer on this issue. #stm8s-discovery #eeprom

Posted on January 25, 2014 at 20:48I am reading it in help files, variables declared as u16/u8 etc. What is this? Does it meanu16=unsigned int typeu8=unsigned char type ?

Posted on January 30, 2014 at 01:05Can STM8S be used with an low cost RF receiver, like the ones available on ebay for $1-$2? If yes then can someone help me identifying library/functions to execute this task. Thanks #interfacing-anything-to-anything

Posted on January 27, 2014 at 19:32I am new to programming in C after years of using Basic on PICs. I would like to know where should I look for functions associated with a peripherals like GPIO ADC etc and what parameters they can accept. I am using Cosmic compiler and trying to program STM8S discovery board.Thanks in advance.

Posted on November 16, 2011 at 05:48I just received my stm8s-discovery and I'm trying to follow this: http://benryves.com/journal/3567231 I keep on getting the following error even though I see this function defined in stm8s_conf.h:#error clnk Debug\project.lkf:1 symbol _assert_failed not defined (Debug\stm8s_gpio.o ) I'm clueless on why _assert_failed() isn't being defined in the object file... EDIT: If I don't #include ''stm8s.h'' it compiles just fine.

Posted on January 23, 2014 at 21:38Hello, this is my first post here and my first attempt in programming an ST MCU. I today bought STM8S discovery board and it should arrive shortly.I was looking for some pointers as to where to get the firmware library I read about at most online websites, which can help me get started. I have downloaded Cosmic compiler and will use STVD IDE to get started.I will appreciate any help and also if someone can recommend any book to learn by looking at simple projects done in STM8S using cosmic and stvd.Thanks

Posted on January 20, 2014 at 13:00STM8L152K6T6My application has one ADC input for external device connection with output volatge range in 0..2V. It works fine for a while, but once,  when external device was unplugged and plugged again, ADC channel returns invalid values and MCU become very hot. After replacing MCU, application works for a long time, but after external device was unplugged and plugged again, that problem returns. ADC do not works properly and MCU temperature too high.ADC input pin is in ''open air''. May be some static electricity killed ADC channel? Should I place resistor between ADC input pin and ground? #adc-damage

Posted on August 06, 2013 at 11:54I finally found the I/O port hardware register map in the hardware manual but there is no description of how to confingure the registers!Any one know where ST have hidden this vital information?The old ST7 manual gave a concise description of what each bit did.I don't want to do it in 'C' in the same way as I don't want to drive my car from the back seat using a broomstick to reach the pedals and steering wheel!Every time I find a document, it answers some questions but never all.I'm making progress but it is frustratingly slow... two steps forward one step back. #stm8l-register-config

Posted on July 03, 2012 at 19:59i want to transmit using the stm8l152 on the stm8l discovery board. For that i have used sys config registers to remap the clk and the tx pin to the Port A. I use stvd and raisonance compiler. i cannot understand why i cannot write to any usart register even though i can write in the other registers. eg.   if i write into the CR1 register of the USART of the stm8 USART1->CR1 = 0x10 ;After this when i check the value of the peripheral register CR1 of the usart using stvd the value is always 0x00Even when using any other functions like usart init , usart clock init etc. the value of the usart registers does not change. Is there something files or initializations i should specifically do. ? should the gpio pins be initialized to a certain state or should some remapping of registers be done? any help will be appreciated. thanks 

Posted on January 09, 2014 at 13:32There's an error which occurs quite commonly:  proj_name.lkfsymbol_f_NonHandled_Interrupt multiply defined in stm8l15x_it.o  While searching for the above string, there ain't any multiple definition for the same, as well the header file incluing NonHandledInterrupt is just included once in the main file (#include ''stm8l15x_it.h'').    Can any one help resolving this?

Posted on July 12, 2012 at 20:08Device: ST-LINK/V2 with firmware V2.J15.S4MCU: STM8L101K3T6i'm trying to connect MCU through the SWIM  in ST visual programmer but always getting ''Check the SWIM cable connection and check all the needed pin connections on the SWIM connector.'' ,on first plug stlink light red, after trying to read mcu memory and getting error message the stlink light-up green led with red and they never switching off.ive conencted pins: 1-reset,7-gnd,8-vdd,32-data from MCU to the ST-LINK connector, i've tryed to connect reset pin of the MCU to ground directly and then tryed through the 0.1uF to the ground.i've checked VÑ�Ñ� on ST-LINK( between pin 1 and 3 of the STM8 connector) and can't see any... can someone enlighten me what can i do in this situation? i thought that i must see 3.3 or maybe 5 volts, but there are always zero. on connector i see 1, indicating pin1 so there i

Posted on January 10, 2014 at 11:01Hello,I want to disable the pull down of the internal SPI module, as I use the external slave pull down, is there a way to do it?EDIT:The MISO is driven only when NSS is released, handling NSS through software disable the pull-down, at least it seems to works this way;)

Posted on May 29, 2013 at 13:40Hi all, Just a little question about ST VD and STM8. Is it possible to use the ''printf'' or ''putchar'' functions in debug mode to display a message in a console or something like that ? (I mean without using USART) I use ST VD and COSMIC compiler. Thks.

Posted on September 06, 2013 at 12:39I am trying to load program using STVD (ST-Link/V2) but getting the error ''can't communicate with the device''. I am only applying Vcc and Gnd to controller + 4 wires of SWIM cable. What should I do? Do I need to use external Pull up resistor on reset pin? #st-link/v2-programming-issue

Posted on June 30, 2010 at 16:41STM8A/128-EVAL Evaluation Board UART1 issue

Posted on December 17, 2013 at 01:26Hi everyone,I need to generate a square wave and I've written some code but it doesn't work as i want. Can anyone help me with my doubts please?first of all: I'm not sure that the following registers are in hexadecimal.. any ideas?second: I didn't undestand what are the complementary output states PRACTICALLY.third: any advices on this code? Thanks a lot for every help,Gilbertouint16_t TIM1_Prescaler=4;uint16_t TIM1_Period=320; uint8_t TIM1_RepetitionCounter = 0;uint16_t TIM1_Pulse = 190; CLK_PeripheralClockConfig(CLK_Peripheral_TIM1, ENABLE); TIM1_DeInit(); TIM1_TimeBaseInit(TIM1_Prescaler,TIM1_CounterMode_Up,TIM1_Period,TIM1_RepetitionCounter); TIM1_OC1Init( TIM1_OCMode_PWM1,                  TIM1_Out

Posted on December 16, 2013 at 00:23Hi everyone,I'm working on a frequency counter and I'd like to use the internal timers of the mcu. Do some application notes exist related to this topic? I couldn't find any link. Otherwise, do anyone of you have some example code and/or advices to give me ? Thanks a lot for helping,Regards,Gilberto #stm8l-stm8-frequency-counter

Posted on November 15, 2013 at 18:36Hi, I'm looking for the proper (standard?) way for cold rebooting an STM8. I see that the first interrupt handler in the interrupt vector is what is called on startup. With my COSMIC compiler, the name of that function is _stext. My thought was that the _stext function would initialize the stack pointer and various other registers, so calling it as a function from inside the program would result in a cold reboot, but testing it, apparently this is not true. In the very least, it seems like it doesn't reset the peripherals. I saw another post that suggested a hack where the watchdog was enabled and then the program waited until it expired and reset the microcontroller. I'm looking for a more appropriate solution though. Does the micro support any way for being reset by software? Shahbaz #reset

Posted on December 11, 2013 at 14:16Hi,I have downloaded an opensource RTOS for STM8 from the below locationhttp://cloud.github.com/downloads/kelvinlawson/atomthreads/atomthreads-1.3.tar.gzFollowed the instructions to build the project, I got the below error during compilationError[Lc036]: no block or place matches the pattern ''ro code section .text in atomport-asm-iar.o'' Please help me in resolving this issue. #stm8-iar-atomthreads-asm-lc036

Posted on December 11, 2013 at 12:16Hi,I am using STM8L152C6. It is required to configure the SPI in the Master mode bi-direction communication.I used the following library functions to perform that:CLK_PeripheralClockConfig(CLK_Peripheral_SPI1, ENABLE);SPI_Init(SPI1,SPI_FirstBit_MSB, SPI_BaudRatePrescaler_256, SPI_Mode_Master, SPI_CPOL_High, SPI_CPHA_2Edge, SPI_Direction_1Line_Tx, SPI_NSS_Hard,0); GPIO_Init(SPI_SCS_PORT, SPI_SCS_PIN, GPIO_Mode_Out_PP_High_Fast);//SCS pin of the meter ICSPI_Cmd(SPI1, ENABLE);The problem is that, although the SPI enabled by calling the SPI_Cmd library function, I read SPI_CR1 control register and found the SPE bit is reset to '0'!! and hence the SPI is not working?Any help :(Thanks

Posted on December 10, 2013 at 23:55Hi guys, I have posted a doubt in stm8-discovery...but due to none response, I am trying to post it here...   this is the problem[DEAD LINK /public/STe2ecommunities/mcu/Lists/STM8Discovery/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/STM8Discovery/Dubts%2c%20how%20to%20reset%20stm8s&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580004008F0975979A844820611B699DF2ED1&TopicsView=https://my.st.com/public/STe2ecommunities/mcu/Lists/STM8Discovery/AllItems.aspx&currentviews=14]stm8 doubt I cant start the program, because the PC doesn  start at 0x8080 :S, it only works in stvd in debug mode afther setting by hand the PC :S Any one knows why? thanks in advance tux

Posted on December 11, 2013 at 08:38Dear Sir,I want to use stm8s003f3p6 Ic in my new design. I am giving 3.3v to its Vdd. I want to know whether I/O pins are 5v tolerent?. I want to interface with ADC which work on 5v and rs485 IC which works on 3.3v. Regards,Somnath Barge

Posted on December 10, 2013 at 13:05Hi everyone, I need to interface my ST with an external chip and I need to provide clock to this chip as well. Can someone tell me how to do it? I mean: is it necessary to use a GPIO or is there another way? Thanks a lot, Gilberto #stm8l-stm8

Posted on December 06, 2013 at 21:36I have a STM8S207 board and I'm using STVD version 4.3.3 with the Cosmic compiler.  I am trying to use the @eeprom directive for writing/reading the data EEPROM and my system hangs when I try to write the data.  Here's what I've been trying so far. #include <string.h> #include ''stm8s.h'' #include ''stm8s_flash.h'' @eeprom s16 eeData; s16 localData; /* Read the data */ localData = eeData; // Works /* Write the data, scenario 1 */ eeData = localData; /* Write the data, scenario 2 */ eecpy(&eeData, &localData, 2); In both cases, the system hangs on the instruction in which I attempt to write to eeData.  When stopping with the debugger I see that it is stopped inside function c_eewrw (library function?) at the following instruction: BTJF 0x505f, #2, 0x

Posted on December 02, 2013 at 14:10Hi there I'm currently using the 32k Special EditionCosmic compiler for STM8, version 4.3.11. There seems to be partial support for C99 features, but there doesn't seem to be support for ''designated initialisers'' (see http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html for example). I've found these really useful in the past  to ensure that my structures are correctly initialised even if I decide to add or re-order members. Positional initialisation is a bit of a maintenance nightmare, by comparison. Does anyone know if (a) these are supported in the paid-for version, or (b) might be implemented soon? Best regards Jonathan