STM8 MCUs

Posted on November 16, 2012 at 10:15When debugging an STM8 using the STM8S-Discovery I can't inspect global variables. When I set a break point and add a variable to the watch window in STVD, I get ''no debug info'' in the Value column. Local variables are OK I have no problems inspecting them. I am using ST Visual Develop V4.3.2 and the Raisonance STM8 C compiler/linker V2.44.12.0199. Any pointers would be appreciated.

Posted on November 14, 2012 at 14:35Hi all, I have an issue while the I2C-host writes and reads to/from the STM8-I2C-Slave. Write operation is immediately followed by a Read. 1) I2C Master writing to STM8-I2C-Slave      : s A2w a 0A a 47 a 40 a p 2) I2C Master reading from STM8-I2C-Slave : s A3r a 0A a 47 a 01 a 00 n p 3) I2C Master writing to STM8-I2C-Slave      : s A2 w a 0A a 47 n p The Master sends (1) and (2) immediately one after the other and this is working correctly. After (1) and (2) a second try to write to the Slave is failing. (1) and (3) are same commands and I am expecting the command sequence and response of (1) and (3) to be the same. But (3) is failing. Is it mandatory to stop(reset) the I2C after the Master reads from the Slave?? If yes, who should do the reset of the I2C, the Master or the Slave

Posted on October 29, 2012 at 07:25hello, please can someone one help me with a uart problem on the stm8s i use a crystal of 14.7456 Mhz , also i do the change of the clock system, see the atached program. the uart1 is initialised as, pa4 and pa5, also i use a second computer with the DOCKLIGHT program to analyze the communication. the uart is set for 9600 baud, 1 stop , 7 data even parity also the docklight program is set for that . if i send one character from the stm8s to the other computer i see that character correct. even with different characters no if i send a character from the docklight program on the other computeri also see that character correct in the stm8s data ram but if i will send a string of characters ,for example      81    82    83    84    8

Posted on October 20, 2012 at 04:10HiI looked at google  MODBUS RTU and ASCII for some source code for stm8 but i could not find any source code for stm8 series... 1. Is there any source codes for stm8 series?2. When a device is connected to stm8 uart(like PLC), is interrupt  proper way  for this? or do you suggest another way for this? Best regards... Thank you in advance #modbus-rtu-ascii

Posted on October 22, 2012 at 12:14hello, please is there a sort of stm8s assembly language available who convert a 16 bit binary  to 5 bcd  code many thanks marc debruyne

Posted on September 28, 2012 at 17:41RAM memory issue on STM8L151G6When using the RAM there are five addresses that I cannot change by software: 0x102, 0x12F, 0x237, 0x24D and 0x2A9. I am using the following test code; for (i=(unsigned char *)0x000;i<(unsigned char *)0x7ff;i++) *i= 0x11;// RAM test When running the test code I see with the ST-Link SWIM debugger that the memory for the five addresses stays unchanged.This is also valid for  memcopy or the _fctcpy('F'). I can change the contents with the SWIM without a problem (for example a fill memory). It is like these RAM addresses are blocked for writing from software. The addresses are not always the same, but mostly it is in the same memory range.  When changing the location of the RAM se

Posted on October 15, 2012 at 19:56 Hi, I'm trying generate a PWM signal whose frequency and duty cycle are controllable by 2 potentiometer on a STM8S105 Board. However, I am still unable to get the variables to update their values. Here is the code: //GPIO: GPIO_Init(GPIOB, GPIO_PIN_0, GPIO_MODE_IN_FL_NO_IT); GPIO_Init(GPIOB, GPIO_PIN_1, GPIO_MODE_IN_FL_NO_IT); //ADC_Config: ADC1_DeInit(); ADC1_Init(ADC1_CONVERSIONMODE_CONTINUOUS,ADC1_CHANNEL_1,ADC1_PRESSEL_FCPU_D2,ADC1_EXTTRIG_TIM,DISABLE,ADC1_ALIGN_LEFT, ADC1_SCHMITTRIG_ALL,DISABLE); ADC1_ScanModeCmd(ENABLE); ADC1_ITConfig(ADC1_IT_EOCIE,ENABLE); enableInterrupts(); ADC1_Cmd(ENABLE); ADC1_StartConversion(); //ADC1 ISR: Value0 = ADC1_GetBufferValue(0); Value1 = ADC1_GetBufferValue(1); TIM2_DeInit(); TIM2_TimeBaseInit(TIM2_PRESCALERR_512,Value0+1000); TIM2_OC1Init(TIM2,OCMODE_PWM2,TIM2_OUTPUTSTATE_ENABLE,Value1+500,TIM2_OCPOLARITY_LOW); TIM2_Cmd(ENABLE); ADC1_ClearFlag(ADC1_FLAG_EOC); ADC1_StartC

Posted on October 11, 2012 at 09:36To optimize the code I put nearly all the flags to bit structures. Now I came across a  bug in the CXSTM8 when writing to bits. Reading bits doesn't bring any problem.  The good news for me is that I found a workaround. Here is the example:/*----------------------------------------------------*/ typedef struct {    int    sem_on  :1;  /* bit */    int    sem_off :1;  /* bit */    int    sem_tog :1;  /* bit */ } key_;/*struct*/ key_ key_x; /*struct*/ key_* key_down = &key_x;&sharppragma section const {} /*struct*/ key_* const key_up = &key_x;

Posted on October 08, 2012 at 08:40 OK, title sounds really weird, but I'm really curious about the low pawer state switch speed of the STM8L micro. I'm doing some tests about switching to LSE and back to HSI, waiting for stablization etc. It looks like the core is acting really slow, or I'm doing something really wrong. Let me share my findings with you, and then please share your ideas with me. Note: I'm switching ON and OFF a GPIO to measure the passed time via scope. Therefore it could be good to keep in mind the switching time. I'm trying to simulate low power entrance and exit therefore you'll see opposite commands in same blocks. Here is a block of code. It runs in 630 us. CLK_SYSCLKSourceConfig(CLK_SYSCLKSource_LSE); CLK_SYSCLKSourceConfig(CLK_SYSCLKSource_HSI); I'm widening the test and cover switch command. Runs in 1,09 ms. CLK_SYSCLKSourceConfig(CLK_SYSCLKSource_LSE); CLK_SYSCLKSourceSwitchCmd(

Posted on September 28, 2012 at 09:52Hi Guys,Do we have a stopwatch feature within STVD? I'd like to measure passed time between two breakpoints as time (us, ms) and cycles.I know there are simulators with MPLAB and IAR IDE with this function but couldn't see anything like that on STVD. Toolchain:IDE: STVD 4.3.2Compiler: Cosmic CXSTM8 4.3.7 #stm8-debug-stopwatch-simulator

Posted on September 25, 2012 at 05:48Hi all,Does everybody have examples chibios base on IAR of stm8? Now cosmic limited 8k, so I want to change to IAR Thanks and best regards Thinh

Posted on September 21, 2012 at 10:33Dear,In the past I published here in the forum a question about EWSTM8 problems.I have been in touch with IAR on that and now I have their Beta version. This beta version has solved a problem with crashes as result of Live Watch activation and yet some improvements.One of the annoying issues with EWSTM8 is breakpoints. When breakpoint breaks the program, I can't run or go step-by-step, until the breakpoint is removed, so it is not so convenient. As well, sometimes I see some communication timeout errors. The 1st problem occurs in the most places in my program, but there are some places where it works properly.We have 3 EWSTM8 seats and the problem is visible in everyone of them. Nevertheless, at IAR site the problem is not reproducible, so they're stuck.I'm kindly asking here, if somebody has been facing the same problem  or have some other issues, to

Posted on September 12, 2012 at 12:40I am working on a low density STM8S with 8Kbyte flash memory. I need to accomodate a main software and a recovery software. I do not need any special bootloader as I am planning to make the software update as part of the application itself. I am newbie in this. Can someone tell me if the following strategy sounds good or if it has any issues: Divide the Flash memory into (Program memory + UBC region[user bootcode]) Program memory shall contain the main software. UBC area shall contain the recovery software. Recovery software shall be used in case a software update fails. Any insights/comments will surely help me. Thank you.

Posted on September 18, 2012 at 17:21 Hi, Is it possible to program only part of the flash memory using ICP? I have STM8 programmed with bootloader using ICP where UBC is protected from 0x8000 to 0x8fff. Now when I try to program the flash with application firmware separately using ICP with CODE settings 0x9000 to 0x9fff, I am encountering an error that UBC is enabled. Why does the programmer care about UBC, when code settings are outside the UBC enabled region? Just to try, I disabled the UBC. But everything in the flash is reprogrammed i.e the UBC region is erased. The MAP file as shown below, however has no code segments in the UBC region. LINK MAP OF MODULE: DEBUG\STM8_SOFTWARE.AOF (MAIN) TYPE BASE LENGTH RELOCATION SEGMENT NAME ---- ---- ------ ---------- ------------ * * * * * * * * C O D E M E M O R Y * * * * * * * * 009000H 000080H *** GAP *** CODE 009080H 000006H AT ?PR??APPLICATION_MAIN?MAIN 009086H 00037AH *** GAP *** COD

Posted on September 04, 2012 at 17:14I need to generate a 20 ms interrupt into my firmware. HSE is 16 Mhz with STM8S208. I put this initialization code into my firmware to accomplish that through the use of TIM3: #define PRESC TIM3_PRESCALER_32      uint16_t counter = 10000;      //counter = counter / 4 * 3; //correction to run closer to a 20 ms period      TIM3_UpdateRequestConfig(TIM3_UPDATESOURCE_GLOBAL);      TIM3_TimeBaseInit(TIM3_PRESCALER_32, counter);      TIM3_UpdateDisableConfig(DISABLE);      TIM3_PrescalerConfig (PRESCALER_32, TIM3_PSCRELOADMODE_UPDATE);      TIM3_ARRPreloadConfig(ENABLE);      TIM3_

Posted on February 09, 2012 at 12:26Hi, I'm running windows 7 64 bit, my target is STM8S103F2U. STVD gives me this error when trying to debug: ''failed to download application: error: swim error [30103]: rlink communication error''.    Rlink does not have problems because works fine with STVP on the same PC and can read and write micros. So at the moment I can't debug. Does anyone know how to solve this problem? Thanks in advance #stvd-rlink

Posted on August 09, 2011 at 18:31Anyone know how to use the @eeprom on the cosmic compiler Does it suppot @eeprom vu32 EE_Total; The above passed the complier but if I try to use it I get errors I've also tried char and int but none seem to work. I want to read and write u23 u16 and u8 to EEPROM without having to worry about pointer etc there also seems to be a 4 byte structure.

Posted on August 30, 2012 at 12:11Hi, After developping and testing with stm8s-discovery connected to various evalboards, i just received my prototype. As written in STM8SVLDISCOVERY's usermanual, i unsoldered the two 0 Ohms of swim connector from the STLINK (i don't want to break the discovery board yet). Now, i disconnected everything on my board (thru jumpers), except external power-supply to the micro, and i connected SWIM port and GND. The Chip i use is the STM8S105S4, and i already changed the device target. Using STVD/Cosmic, i try to enter debug mode and i receive this message :   Starting debug session...   -> Emulator reset (usb://usb)...    ** Connection error (usb://usb): swim error [30006]: comm init error: chip does not answer   

Posted on August 20, 2012 at 10:30I've got an STM8L-Discovery and am having loads of fun with it.  I would like to go beyond flashing two LEDs and writing stuff to the LCD display, however, which means I'd like to breadboard.  The problem is that the STM8L-Discovery resists breadboarding.  Aside from the board being just wide enough to be annoying on a breadboard, the pins PD2,3 and PB0-7 across the bottom absolutely defy plugging this into any breadboard I've been able to find. Are there any breadboards out there friendly to the STM8L-Discovery board or will I have to mutilate my little friend here and saw off the offending pins? #stm8l-discovery #discovery-breadboard #breadboard #discovery-breadboard

Posted on August 15, 2012 at 04:33Hi all! I'm working with STM8S003F3 chip on my project and I'm have some problem about it, i wana help of ST technician. on my project,i using pin4 and pin5 of port B to control normal IO applications,I have already used sample code of ST's library about GPIO in stm8s_gpio.c file, i have already written code following: int main(void){ GPIO_DeInit(GPIOB);  GPIO_Init(GPIOB,GPIO_PIN_4,GPIO_MODE_OUT_PP_LOW_FAST);   while(1){   GPIO_WriteHigh(GPIOB,GPIO_PIN_4);   }; } but it not run. the voltage of this pin ~1.85V when it high and = 0.00V when it low I have already used this code to control all of other pin of other port,it run fine. I have already used this code too to control pin4 and pin5 of portB of STM8S105C6T6 chip on stm8s-discovery board,it run fine. May be it have some special thing about these pins??

Posted on July 26, 2012 at 09:57Hi Guys,I'd like to work on multiple projects at the same time using STVD. But it does not permit to open a second instance. I dug in to the options and help, but couldn't find any clue about this subject. Is there a way to enable multiple instances of STVD?Thanks in advance.Related Tools:ST Visual Develop (v4.3.1)

Posted on August 13, 2012 at 16:15Hi. I'm trying to use Input Capture mode on Timer2 (channel 3) on an STM8S105 (discovery board). It won't work, and when i m watching peripheral registers with appropriated breakpoints, the registers aren't changing from default value. I m using STVD with cosmic compiler. I'm using firmware libraries. (i already checked out, that every macros was pointing to the right register.) Here's everything relevant in my code :    CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER2, ENABLE);   GPIO_Init(GPIOD, GPIO_PIN_2, GPIO_MODE_IN_PU_NO_IT);      //!\ modify option bytes : select TIMR2-CH3 for AFR1        TM2_DISABLE;  //macro resetting CEN bit in TMR2->CR1 register   

Posted on August 08, 2012 at 17:37Can someone direct me, a newbe to hardwire interrupts, to a pdf file telling me how to use an interrupt on the stm8s207? I want to run the stm8s continuously and retrieve information by command from and master controller. charles arnett

Posted on July 25, 2012 at 11:59Hi, I am new here, and new with STM8. I wrote some code and it works fine :). For final production I want use smaller STM8. Where can I find how big is code? I want use a STM with flash memory as small as posible (or as cheapest as posible) Now I am using stm8-dicovery, STVD and cosmic compiler. #stm8s #stm8-discovery

Posted on August 09, 2012 at 01:13Hi all,I am a total Newbie in STM8s. I recently purchased a STM8SVL Discovery Board and it worked fine. After that I had to develop an Application for my project so I broke the Controller Board, prepare a Hardware according to the schematic given and tried programming using SWIM and gave an External Supply. I double checked all the connections. However, I have not used Vcap with a Capacitor and directly Grounded it. Also I have connected GND to all the GND Supplies ( Analog / Digital / IO VSS) and Vcc (= 5 V) to all the VDD in the circuit.The error I get is : Connection error (usb://usb): swim error [30200]: st-link connection errorPlease help. Do I connect the Hardware as given in the schematic ?? #stm8s #discovery-board