STM8 MCUs

Posted on December 05, 2013 at 10:28Hi folks Couple of questions about the _checksum16() function. I've kind of got it working, but: I have to put in an ''extern int _checksum16(void);'' declaration of my own - I can't for the life of me find a header file which declares thisIt appears that it fails if there's a breakpoint set, presumably because setting a breakpoint modifies the code memory that's being checksummed. Is that expected, and does anyone have a tip for a reasonably safe workaround? Best regards Jonathan

Posted on December 04, 2013 at 08:49Hello. We are developing a low power product that uses STM8L151 MCU. The product is in low power run mode when on idle stage and program is executed from RAM. I was wondering that how reliable is this functionality when device is powered on for years. We use IAR compiler that copies RAM function from flash to RAM only at startup. This worries me a bit... how big is the possibility of RAM corruption? We use IWD but Im not sure if that catches some RAM corruptions that does not affect to IWD refreshing.

Posted on April 16, 2012 at 15:14Has anybody information about the STLux 385 ? This is assumed to be a STM8 based controller, especially targeted to lighting applications. Even ST as producer seems to obliviate any knowledge ... #ride #digital-power-control #stlux #stlux #stm8 #stm8 #raisonance #stlux

Posted on December 03, 2013 at 14:36For Raisonance STM8 compiler, RLink and EvoPrimer users... New release of Raisonance software tool set for STM8 available supporting new STM8AL ultra-low-power series for automotive applications including: . STM8AL3136xxSSS . STM8AL3138xxSSS . STM8AL314x . STM8AL316x . STM8AL3L4x . STM8AL3L6x Software can be downloaded on the Raisonance tool support site:http://support-raisonance.com/extranet/tools/index.php?param=tool__id__11&sharpstm8-download Cheers, #stm8 #st7 #raisonance #ride

Posted on April 27, 2013 at 08:19Just received a letter from Raisonance(aka KEOLAB). They changed their license policy. Their 32kb-limited compiler isn't free anymore. It costs (TADAAAM!!) 700 euro per computer. The only alternative is cosmic compiler, which is 32kb-limited too, and has 1 year time limit. All that crap means there will be NO open-source projects, NO hobbyists(like me) who use STM8 chips. Looks like these guys pushed us back to 80th, dark world without any open software, to astronomical prices for MCU tools. It's pity, I liked these processors, I liked discovery boards, but I'm forced to migrate all my projects to AVR or ARM chips. I'll spent all my stm8 chips and I'm not going to buy them anymore. Good bye, sweet prince. #compilers #open-source #stm8

Posted on November 26, 2013 at 15:43I have uncommend all the Periph_Drive, but the compiler still do not compile their source file. Why there are some source file are gray? I want to use TIM1, but the compiler keeps tell me the function inside it have being defined. I have been tortured by this for almost all day? Can anyone help me? Thank you. #stm8l-discovery #iar #stm8l

Posted on November 25, 2013 at 14:58Hello everyone, I can't find the relative pin to the internal temperature sensor. Does anyone know which pin is it? Or should i only configure the TSON bit in the ADC_TRIGR1 register to wake up the temperature sensor? In fact the problem rises also when i want to select the right channel on the adc.. Can anyone help please? thanks a lot, best, Gilberto #stm8l152c6t6-temperature-sensor

Posted on November 17, 2013 at 22:48I suddenly find that we need a couple of stand alone programmers for our STM8L052 board. By ''stand alone'' I mean the application code will have to be loaded into the programmer and it will flash the production units via SWIM. The operation will just plug it in and press the button; no connection to a PC allowed. Anybody know of such a thing?

Posted on November 21, 2013 at 20:05I plan to use the STM8S003K3 in my product.  However the flash has a life of only 100 cycles.This makes it impractical to use during development.  The STM8S103K3 looks like an exact substitute - is it?Is there any subtle difference I need to look out for? #stm8s

Posted on November 18, 2013 at 14:47I'm looking to build a small application which wakes up the uC each 500ms to handle some software loops, and then go back in active halt mode with RTC (alarm and wake up function enabled) and LCD running with LSE. The firmware is working, but the measured power consumption is way too high (near 35uA).I've checked that the clock is only distributed on RTC and LCD and that each module are off. There is no interrupt pending and the halt() seems to be correctly executed. The GPIO are configured with a fixed reference.The problem I see is that RTC_ISR1->RECALPF is always 1, don't understand why this one never goes to 0, and how to modify the code so this flag works.How should I go further to discover what is drawing current?

Posted on November 19, 2013 at 18:21I have encountered an issue with STVD which is persistent also in the latest version (4.3.4). The issue seems to be pre-compilation (my guess would be generation of the project.lkf file), but I'll get to it in a moment. I am using Windows 7 (64-bits) and am using the COSMIC compiler. The version report from COSMIC is: ------------------------------------- COSMIC STM8 C Compiler Evaluation Kit Version: 4.3.7 Date: 29 Nov 2011 ------------------------------------- COSMIC Software STM8 C Cross Compiler (LIMITED) V4.3.7 - 29 Nov 2011 - Win32 COSMIC Software STM8 C Parser (LIMITED) V4.10.2 - 02 Nov 2011 - Win32 COSMIC Software STM8 Code Generator (LIMITED) V4.3.7 - 29 Nov 2011 - Win32 COSMIC Software STM8 Optimizer V4.3.6 - 29 Nov 2011 - Win32 COSMIC Software STM8 Macro-Assembler (LIMITED) V4.6.22 - 04 Aug 2011 - Win32 COSMIC Soft

Posted on November 11, 2013 at 18:46Hello all, SDCC seems now to be able to support STM8 (see here for example : http://comments.gmane.org/gmane.comp.compilers.sdcc.user/4461). didn't look more right now, but will in the next days. maybe ST could support the SDCC community, so we get a completely free compiler for the STM8..! so why not add SDCC support in STVD..?? ffred

Posted on November 08, 2013 at 10:45Hello,I don't understand well how the STM8L works, when enabling a module we have to enable the clock sourcing the module and then enable the module itself, that's OK.For module configuration (register access) it seems that the module has to be disabled and the clock enabled.If I want to disable a module for a while without loosing the configuration, how do I proceed?For example I enable the LCD to display a message, after some time I want to disable it to spare power. Should I: - Stop the clock (PCKEN23=0) but let the module enabled (LCD_CR3_LCDEN=1)?- Stop the clock (PCKEN23=0) and disable (LCD_CR3_LCDEN=0)? - Or let the clock (PCKEN23=1) and disable (LCD_CR3_LCDEN=0)?This is the same question for all module, which is the global principle for the STM8L?Hoping someone will help me;)

Posted on November 11, 2013 at 16:19I've read the AN2867, and calculated that for having a gain margin of 5, the recommended crystal should have a max ESR of 50K and 6pF load for a minimal 3uA/V transconductance. This will not allow to use any tiny smd crystal, for example the Microcrystal CM7V-T1A.Is there any advice about this?

Posted on November 07, 2013 at 15:42Hi everyone,I'm new to the STM community and those microcontrollers too, I'm learning to use them;)I've configured a communication based on SPI through DMA, everything is working excepting the SCK. I've configured it to be low while inactive, this is the case when the SPI module is active and the clock signal toggling, but outside this period the SCK is high.How is it possible to force the SCK to be low?  #spi

Posted on November 07, 2013 at 12:40We use the STM8S003 MCU in one of our products and specifically we use the LINbus communications in slave mode. In the 003 datasheet it says the UART (UART type 1) can actually only support LINbus master mode. When we program a MCU with the software however it does indeed seem to be able to communicate as a LINbus slave. Can you explain this? Is there any danger in us using the 003 MCU in LINbus slave mode? i.e. are there any plans to remove the LINbus slave capability of the 003 MCU. We have to use the 003 MCU because our product requires the small package size (UFQFPN20 3x3). I also have a question regarding the STice emulator. When we try and configure the emulator as an STM8S003 (actually select 103 on emulator) and toggle pin 20 (PD6) with the software setting up this line as an input I/O it does not toggle and the emulator thinks the line is permanently low. We have

Posted on November 03, 2013 at 00:51Hello. I've a 24C32 on the good pin of my stm8s, I use the stm8 eval library but i've a sEE_TIMEOUT_UserCallback all the time. Is there a better library ? Thank you

Posted on June 10, 2013 at 16:48Hello everybody,I'm programming a STM8L152C6 on the STM8L-discovery. Wanting to improve the consomption I tri to power down the HSI. For that I use the instruction  // Clock source   CLK_LSICmd(ENABLE);   CLK_SYSCLKSourceConfig(CLK_SYSCLKSource_LSI);   while(((CLK->ICKCR) && CLK_ICKCR_LSIRDY)==0);   CLK_SYSCLKSourceSwitchCmd(ENABLE);   CLK_HSICmd(DISABLE);   CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1);What seems to work for some people according to the topics I read on this site. I'm switching the clock source perfectly and the HSION bit in the CLK_ICKCR is 0. But the HSIRDY in the CLK_ICKCR is steel to 1 and the HSIPD in the CLK_REGCSR is to 0. I'm not using any peripheral for the moment.Am I doing something wrong? What could avoid the HSI to turn down?I hope someone can

Posted on June 13, 2013 at 13:27I want to use stm8L watch dog in halt/halt-active mode. my system wakes up by RTC.1. when I choice Independent watchdog, a watchdog reset happens when system is in halt/halt-active mode. As you know, the option byte(0x4808) default setting is IWDG still runing in halt/halt active, if you do not feed watchdog, a watchdog reset happens. I do not want to feed watch dog in interrupt routine, So I choice Window watchdog.2. WWDG stop runing in halt/halt-active mode according to option byte configuration. it is difficult to feed watch dog in allowed watchdog window. stm8l runs at 16MHz, It means WWDG must be refreshed in about 50ms. but in my task scheduler, it maybe take more than 50ms when task processing so that the refresh allowed missed. I do not want to use timer interrupt to feed watchdog. I don't have good idea to handle WWDG.3. I choice IWDG again. after powers up, check

Posted on October 09, 2013 at 23:02I'm using Cosmic 4.3.6 compiler & have a project with greater then 32k code.  I need to checksum the flash at startup and periodically during runtime to satisfy UL60730.  My first project (about 12k code size) went well & everything was as I expected.With this one however, the checksumming blows up completely.  The descriptor table at __ckdesc__ is built using NEAR pointers, and the actual function f__checksum16 in cksum161.s fails miserably as it is expecting the descriptor to be in near memory.  Even if it was, all the pointers are truncated.  Of course the start address of 0x8080 is OK but the end address of 0x0651 instead of 0x10651 is completely wrong. Hopefully I've done something wrong!  I'm not holding out much hope though.  Any ideas? Thanks jdf

Posted on October 25, 2013 at 00:18I have an STM8L application that needs to scan several ADC channels on a fixed time basis, so I used the ADC_DMA code from the STM8L standard peripheral examples as a starting point. The timer is set to a 1KHz trigger rate, and processing of ADC samples is done in the DMA Transfer Complete ISR. All works as expected (application is a resistive touch panel). So far, so good. Now I need to shut off the chain and put the CPU in a low power Wait state until some external interrupt occurs. I need to turn off the TIM1/ADC/DMA chain so that the TC interrupt does not wake the processor, but all attempts to do so either fail to stop the TC interrupt, causes channel data written to the DMA circular buffer to get out of sequence, or succeed but eventually causes the system to hang. How should I disable the chain before sleeping, and how do I insure that the data written to the DMA circular buffer re

Posted on October 10, 2013 at 08:52Hello, I have a simple question: uint32_t temp; temp |=  ((uint32_t)1 << 16); without retyping it does not work (although if I add the expression to Watch, it shows expected 1 on 16th bit of temp). Why? I use Cosmic compiler and STM8S207... Thank You #shift

Posted on September 11, 2013 at 14:17Hello,I am currently working on STM8L15C6. For my application I need to read the value stored at location VREFINT_FACTORY_CONV. The value at this memory location is 0xFF. We were assuming the value to be somewhere around 0x80. Any explanation on this would be very helpful.Many Thanks,Megha

Posted on March 17, 2011 at 04:09How to programming ROP option byte via swim? #programmer #stm8

Posted on September 26, 2013 at 05:36Hi.  Trying to find out what, if anything, the STM8 compiler does with the @stack function qualifier.  The STM8 LIN Driver uses @stack quite a lot, however it is not documented in the Cosmic STM8 User Manual. Thanks Colin #cosmic-lin-driver