STM8 MCUs

Posted on August 07, 2012 at 22:02 I have an embedded system built around a STM8S105 which, among other things, must measure the frequency of a pulsed input. The pulses are coming in on pin 29 (PD4/TIM2 CH1) anywhere from 0 to about 1200 pulses per second. What follows is my initialization of the timer and the interrupt function. I know the interrupts are happening at the input rate because I checked with an oscilloscope and a test output in the interrupt function. But when I read the counter register in the interrupt function, it is always different, almost random. It looks like the counter never resets but I don't know why. I know it is counting input pulses because when I stop the input, the interrupts stop. Please take a look at my init and interrupt functions and tell me what I am doing wrong. Thanks My initialize function: TIM2->CCER1 = TIM2_CCER1_CC1E; TIM2->IER = TIM2_IER_CC1IE; TIM2->CR1 = TIM2_CR1_CEN; i = (u16)(CLK_GetClockF

Posted on July 23, 2012 at 10:38Hi All,I'm using STM8L and trying to compensate the RTC in terms of the temperature changes. But the calibration value doesnt effect as the written on the Application Notes and Reference Manual. For example, when I simply change the calibration value as to +488,5 ppm (the max in 32 sec window), I cant see the expected difference in time. The difference I see is much more less than expected. I hope to get solution or at least any suggestions to fix it from you..Thanks in advance,Best Regards,Kadir #rtc-calibration

Posted on July 27, 2012 at 14:00HelloI'm trying place constants at fixed memory address according to this link http://www.cosmic-software.com/faq/faq3.phpMy code is:#pragma section const {sver}const uint8_t SV_HIGH=1; const uint8_t SV_MID=2; const uint8_t SV_LOW=3; #pragma section const{}I added new segment into linker file:+seg .sver -b 0x9f10And linker returns:#error clnk oprawa_v1.lkf:1 bad address (0x9f11) for zero page symbol _SV_MID#error clnk oprawa_v1.lkf:1 bad address (0x9f12) for zero page symbol _SV_LOW#error clnk oprawa_v1.lkf:1 bad address (0x9f10) for zero page symbol _SV_HIGHCan Any One help?

Posted on July 25, 2012 at 16:49I used pe1 and pe2 pin for i2c but this pins not work normally now. i make high pe1 and pe2 but this pins always low but pe0 and pe3 can be high. how do i connect this pins for i2c? 

Posted on August 01, 2012 at 16:21I am trying to use assert () to check amd make sure that my input is an integer.  I assign char choice[15]; u32 a; u8 n;  then I write n=Str2Int (*choice, *a); and it don't work, error bad argument type.   If I change my declarations so that I get no error on Str2Int I then get an error on assert (a>=1 && a<=9); I have changed my config file to allow assert and added a prototype and included assert.h. I am using Raisonance tools charles arnett carnett1@instrulab.com

Posted on June 25, 2012 at 21:33I have a project with STM8L151 and I have a dozen of quality issues with EWSTM8. Since a few days ago, after the upgrade to Win7, I have been facing consantly crashes. It seems to me as it happens because of  LiveView. When it is open with many variables inside, it crashes within a few minutes. Has anybody here been facing a similar problem ? Maybe other problems ? I'm asking because I've been checking these issues with IAR, and want to know if these problems are unique for me. I can share here some of the problems I found out: 1.Breakpoints- if programm stops on it,  I can't step out or run, until this breakpoint is removed. Very annoying bug. 2. If any of  low power modes is being used, in that time it's impossible to break the debugging. I'm not sure if this IAR issue or STM8L limitation. Probably the latter is the correct, since during the low power mode, ev

Posted on July 24, 2012 at 15:13Hi, I'm using stm8s library 1.1.1.Cosmic C 4.2.10 Compiler.the mcu is stm8s207rbt6 I'm experiencing an issue writing a byte in the data eeprom while I'm receiving data on the uart3 (tried also on the uart1 and it's the same) The issue is that I get an unexpected reset of the mcu. I checked all the reset sources flags. and no one is set.. it seems just a reset without a precise reason. I found a workaround but is not ok for the my application. I have to disable the usart3 rx interrupt using (UART3_IT_RXNE_OR,DISABLE) after every reception and during the intervall I can write inside of the data eeprom without problems.. All the gpio are configured correctly ,Is really strange.. Do you have any suggestion ? thanks Spectre

Posted on March 23, 2009 at 03:35STM8_firmware_library #can-init #stm8s-can-example

Posted on February 20, 2012 at 12:46I was trying to get the ADC working on an STM8S discovery, but left and right alignment setting of the ADC gives different results. In the file stm8s_adc1.c of the standard firmware library there is:/* Left alignment */     {         /* Read MSB firts*/         temph = ADC1->DRH;         /* Then read LSB */         templ = ADC1->DRL;         temph = (u16)((u16)(templ << (u8)6) | (u16)(temph << (u8)8)); } I suppose that last line should betemph = (u16)((u16)(templ >> (u8)6) | (u16)(temph << (u8)8)); (shifting the lower byte in the other direction)

Posted on July 19, 2012 at 20:18Hello, I have question about parameter of MCU STM8S 103F2: ''NRW - Erase/write cycles - (program memory)'' I read document:  ''Specification: STM8S103K3 STM8S103F3 STM8S103F2'' (DocID15441 Rev 9/ CD00226640.pdf ) on page 70, Table 37: ''Flash program memory/data EEPROM memory'' And I found that min NRW parameter for program memory is 100 000 cycles. Is it mistake? Is it really 100k cycles? It seems to be quite strange for me. I read some other documentations for othes MCUs and this parameter has value usually 10k. Thank you in advance for answer. Regards, Jane #erase-cycles-program-memory-100k

Posted on July 07, 2012 at 20:24I found something very funny/weird when using TIM1 to measure the frequency of a signal: Set TIM2 and TIM1 to use the same prescaler (e.g. 8). TIM2 is configured to generate PWM with period 10000, in this case resulting in 2Mhz/(8*10000)=25Hz signal. Then, TIM1 is configured in Input CapCom mode, and its trigger controller resets the timer on every rising edge on input channel1. Now connect pins TIM2_Chan1 with TIM1_Chan1. In theory, the values obtained in CapCompareReg1 of TIM1 should equal the period of TIM2 perfectly. In this example, the CCR1 contains 8880 instead of 9999. The values deviate even more worse when taking smaller prescalers for TIM1.  -------------------  Main code:    TIM1_DeInit();     /*

Posted on June 28, 2012 at 02:29Hi all,I'm moving a design from STM8S105 to STM8S207.I'm thinking of raising the clock speed from originally 16MHz to 24 MHz in order to get more MIPS from the core.However, for clocks > 16 MHz, the flash memory requires 1 waitsate. I suppose that the instructions are fetched by the core from within the flash (i.e. there's no cache).If the above is true, then the core would run slower with the 24 Mhz clock. The only benefit of a faster clock would be faster peripherals.Is that correct? (Hm now I'm thinking that I should test that with a scope)ThanksNico

Posted on May 22, 2012 at 17:59I'm starting to work with STM8. I'm not finding a way to configure the ports as pull-down.

Posted on June 13, 2012 at 21:02The original post was too long to process during our migration. Please click on the attachment to read the original post.

Posted on June 27, 2012 at 05:08I am using STM8S103 to measure three channels of voltage signals named vs12, vs5 and vs3 respectively. Timer 4 is enabled to generate interrupt every 10ms and three voltage signals are measured alternately. That is, in the 1st 10ms interrupt, vs12 is measured. In the 2nd 10ms interrupt, vs5 is measured. In the 3rd 10ms interrupt, vs3 is measured, and so on. During each measurement, mcu makes 16 captures for further average processing. The measurement result will be displayed in HyperTerminal via UART.The problem is that when only 1 channel (vs12, vs5, or vs3) is enabled, the measurement is correct. But when two channels are enabled, both channels' measurements are wrong. Could anyone have a look at the following code and give me some suggestions?The C code is described as follows.main(){      ADC1->CR1 |= (ADC1_CR1_SPSEL & (0x02<<4));&nbs

Posted on May 30, 2012 at 10:35I'm coding my 3rd testing project on stm8, to be exact in 2 different mcus, 103 and I'm using cosmic compiler, and i didnt have any problem with the previous 2 projects (because i didnt verify the size).The problem is that binary files generated by cosmic linker are oversized,... I expain it.Until now ( I have more than 25 years programming and 13 years in MCU's world) when you included functions and you didnt use them, the linker was able to remove them from final binary since they are not being used..., I say until now because cosmic compiler is not doing that. In my 3rd testing project i wanted to create the bigger array in flash (with const char noname[***];, where *** is the size). What was my surprise when with a small code (about 10 lines my code, basically initializing ports and timers) the bigger table size that I was able to create in a 8kb flash stm8s103 was just 3.. I though then that i did something wrong so i

Posted on May 23, 2012 at 13:00I am using STVD 4.3.1 with ST-LINK and windows 7 32bit.Most times I try to enter debug mode I get COMM TIMEOUT ERROR.  Clicking STOP and trying again just results in the same error over and over again.The only way to clear the error is to unplug the ST_LINK form the USB, restart STVD and power cycle the target ( not sure if this is necessary ).I have seen other posts reporting the same problem but with no solution.I have upgraded my ST-LINK to the latest firmware and upgraded the windows driver but the problem persists.  I think it started when I upgraded STVD.Anyone seen this problem / solved it ?

Posted on June 21, 2012 at 13:54 Hi all, I'm trying to write an update routine for an STM8S003F3, so that it can be updated over SPI. I'm pulling 128byte chunks of data from a routine in ram, then attempting to write them to the main program flash. I've tried to follow the programming guide http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/PROGRAMMING_MANUAL/CD00191pdf, but it seems that when I try to write a block, nothing is happening. Here's my code: FLASH->PUKR = FLASH_RASS_KEY1; FLASH->PUKR = FLASH_RASS_KEY2; FLASH->CR2 |= (u8)0x01; FLASH->NCR2 &= (u8)~0x01; flashPtr = (u8*)(PROGRAM_FLASH_START_ADDRESS + (numBlocksWritten * 128)); for (i = 0; i < 64 ; i++) { //write the block directly to memory offset by the number of 128 sized

Posted on June 18, 2012 at 17:23Hi everyone,I have serious problem about TIMx_SR1 register. This register is  0x07 at the normal time. I finished my code and i am using timer3 everything is ok. Sometimes my timer3 working wrong and i found problem.The problem is SR1 register changing automatically and new value is 0x06. So that update interrupt flag(UIF) is set to zero and after this time TIMER3 always working wrong and not changing this stuation unless upload hex code again to MCU.Can anybody help me? Thanks alot. Datasheet says to me(RM0013 page:182/266): UIF: Update Interrupt Flag This bit is set by hardware on an update event. It is cleared by software. 0: No update occurred. 1: Update interrupt pending. This bit is set by hardware when the r

Posted on June 13, 2012 at 14:47I'm relatively new to Raisonance/RIDE 7 for STM8 , and wondering that it seems not to support the ST-Link debug adapter, only it's own RLink. Is this correct ? Sorry to say so, but I consider this either poor performance, ideosyncratic - or both.

Posted on June 03, 2012 at 07:04I am using the STM8S as an SPI slave device.  The protocol I am using has a fixed sized buffer and I was thinking about using this interrupt to reset the buffer pointers.  The data sheet suggests that this interrupt can be used to wake up the STM8 from wake or halt mode.  Does this mean that it only works in these modes or does it happen every time SPI comms is initiated by the master.I have tried experimenting with this and it appears to be the case but I'm looking for confirmation before I start to reply on this.Thanks in advance,Mark #spi-wkie

Posted on June 11, 2012 at 16:36Hello, Wondering if anyone has been able to use IAR to put a table in ROM memory instead of the default RAM with init table.  I would like something like: code int a[] = {1,2,3,4,5,6} or int a[] @ ''abc'' = {1,2,3,4,5}, where abc could be defined in the linker. Thanks, AlphaWolfXV #iar #define #table #stm8

Posted on May 10, 2012 at 13:01Dear all,I have some strange roundings with float values: for example when I write 0.05 in eeprom (calibration parameters) it becomes 0.049999997 when I read It.0.2 becomes  0,199999988.I use Cosmic compiler, I tried to change FLT_DIG in float.h but nothing changes.If someone has a clue please help me.Many thanks in advance #floating-point---just-say-no #stm8-stm8l-float-rounding-cosmic

Posted on May 25, 2012 at 23:25Hello, VREFINT is specified as 1.224V +/-20mV with VDD = 3.0V. Is there any information available on the accuracy when VDD = 1.8V? Any guidance welcome!! Kentxu. #stm8l

Posted on May 01, 2012 at 07:34hello guysI am new to this forum and I want to ask the solution for one of the problem which I encountered during the testing of my STM 8 microcontroller board.Actually I was testing the board and than during the testing I encountered this problem:Check the SWIM cable connection and check all the needed pin connections on the SWIM connector.I have attached the snapshot of error too for analysis of exact problem.Now I want to know why I am getting this error and what is the solution to it.Thank you