STM8 MCUs

Hello all. There are 9 sources of reset possible in STM8AF52xx according to the reference manual.They are :External reset through the NRST pin• Power-on reset (POR)• Brown-out Reset (BOR)• Independent watchdog reset (IWDG)• Window watchdog reset (WWDG)• Software reset• SWIM reset• Illegal opcode reset• EMC reset: generated if critical registers are corrupted or badly loadedExcept for external reset throguh NRST pin, all others are said to be internal reset.There are flags available to check the reset reason for internal resets except POR and BOR in the RST_SR register.How to distinguish between External reset, POR and BOR? Could anyone share a strategy on how this is possible?

IRET returns to nowhere from wakeup timer ISR as soon as programmable alarm interrupt is active!Here is the STVD screen where programmable alarm and wakeup timer interrupts are enabled and wakeup timer ISR is just about to end. In the memory window at the bottom centered you can see a nonsense address stored in stack (highlighted with yellow).Next is the screen of the result of IRET instruction

I am analyzing the UART data frame of an outsourced device that uses the STM8S105 MCU. The data frame specification is:* 1 start bit,* 8 data bits, * 1 parity bit,* 2 stop bits.Therefore I expect a data frame as in the below Figure 115 from the STM8 reference manual RM0016. However, both the logic analyzer and oscilloscope show an extra bit after the 2 stop bits. Then the next data frame begins. This is illustrated in the second figure below.Question: what feature creates the extra bit? This is unexpected.Is it possibly related to the break character feature?Thank you for your response.Figures 1 and 2 ...................

Code shown in details. I am guessing something is wrong with clocks - this doesn't make sense though since tx is working just fine. I see signals just fine on the scope. Both tx and rx are high during no transmit. Clocks and initialization code shown below. CLK_DeInit(); // set the CLK peripherals to reset value  CLK_SYSCLKConfig(CLK_PRESCALER_HSIDIV1); // set the master clock to HSI 16M  CLK_SYSCLKConfig(CLK_SOURCE_HSI);  CLK_SYSCLKConfig(CLK_PRESCALER_CPUDIV4); // set the cpu & window watch dog clock to 16M/4 CLK_CCOConfig(CLK_OUTPUT_CPUDIV4); // we are outputting the fCPU/4 (4MHz/4 = 1MHz) - PC4 CLK_CCO TIM6_DeInit();             // TIM1 Peripheral Configuration Clear TIM6_InternalClockConfig(); // select timer 6 to run from internal clock TIM6_TimeBaseInit(TIM6_PRESCALER_64, 250 ); // set the timer c

i had received this function from the ST Micro self test evaluation package for MCU STM8S207RB

Hello, everyone,I have a problem with ST Visual Develop, version 4.3.12 (See attachment 1)If I launch ST Visual Develop as administrator, I am not allowed to enter debug mode, but I get the message: "** Connection error (usb://usb): gdi-error [40201]: can't access configuration database".On the other hand, if I launch ST Visual Develop in normal mode, i.e. not as administrator, I get the message "Access to C\Program Files (x86J\ST Micro electronics\st_ toolset\stvd\default.wed denied" but then it runs correctly and even allows me to enter Debug mode displaying" Access to C\Program Files(x86)ISTMicroelectronics\Firmware\ST16_1_Modified_03072021_Light_MAX31865\ST14_0.wdb denied." and yet it allows me to debug, make changes and save them. This message also appears to me when I exit the Debug session and also when I exit ST Visual Develop. I have verified that the same problem exists with both Windows 7 Pro 64, Windows 7 32 and

Using the Cosmic IDE, I have the non-inverting input of COMP1 driven from PA4 by closing RI_AnalogSwitch_14 and RI_AnalogSwitch_0 and enabling RI_IOSwitch_3. I have COMP1 configured for COMP_Edge_Rising and the COMP1 interrupt is enabled. I see interrupts occurring when there are positive transitions on PA4. All good.I'd really like to measure the slope of those transitions, so I want to use the Window mode to additionally trigger COMP2 at a lower voltage. According to figure 23 in the datasheet, it would seem that all I need to do (after setting the COMP2 inverting input appropriately and enabling the interrupt) is close the WNDWE analog switch to connect the non-inverting input of COMP1 to the non-inverting input of COMP2.But this doesn't seem to work. Worse still, I now don't see COMP1 interrupts. It's as though closing the WNDWE analog switch has disconnected COMP1 from AS14 in the analog switch matrix.Figure 54 doesn't seem to clarify the situation.

I use STVD with the cosmic compiler, SPL library and STVD to flash. I am able to control the STM8S208RB Nucelo board with this setup, and verify the board is functioning correctly.I then lay out a PCB with a STM8S003F in a TSSOP-20 package. The layout is bare bones: just the control pins to talk to the chipset (Vcc, GND, SWIM, NRST) and the stability cap. I update the code to turn on pin 11 [GPIO PortB-5], I update the MCU in the project settings of STVD, I update the MCU selection in stm8s.h, and I update the MCU in STVP as well. I'm able to compile and flash the program with the USB st-link v2 mini available from Amazon.When I go to execute a file in ram from STVP, nothing happens. I verify the Vcap capacitor voltage is proper (1.8V). The voltage to the chip (pin9 VCC) is 3.3V. I monitor the voltage on pin11 [PB5] and see 0V. I want to turn it on and off to get me started, but after several hours of trying to figure this out I'm stuck.

Hi all.I tried to use GPIOB4 as output but failed.But it works as I2C ​SCL so I guess the chip ok.I cant find alternate function for it.Someone please help me.​

Good morning. I've been trying for a while to put the MCU in low power with the wfe() instruction and wake it up with TIME2 but the MCU gets stuck in wfe() and doesn't wake up. With the debugger active it seems to work even if it doesn't respect the times of the TIM2 counter.Does anyone have an example or a template to study to understand what I'm doing wrong?Thanks from now to anyone who can help me.

Hello,Problem opening the Programmer, I can't click on the Integrated Circuit icon.The error occurs almost always, eventually when reinstalling, once or twice the programmer window opens correctly. After giving this error, it does not open again and only presents an error.The problem occurs even in a newly installed system, 32 or 64 bits.Tested with Windows 7 and Windows XP, which System should work?Since 2017 there are no updates. Any possibility of making a plugin for Eclipse?The SDCC compiler already supports STM8S, and it works on Linux as well.

Just changing over to the STM8 using STVD and Cosmic.I have converted an existing project over to the new chip and compiler and have a clean compile of all the modules. The Linker is complaining that #error clnk Debug\5971.lkf:1 @svlreg missing for function f_CAN_RX_IRQHandlerI have updated the vector table in stm8_interrupt_vector.c to identify I have a Tim2 and a CAN Rx interrupts(see below). The Tim 2 interrupt handler is in a file called 5791.c and the CANRx interrupt is in the stm8s_it.c inserted in the list of interrupt handlers as shown below://****************************************************************************// CAN_RX_IRQHandler// Stores data into extern variables// Calls CAN_RX() to parse data//****************************************************************************   INTERRUPT_HANDLER(CAN_RX_IRQHandler, 8)   {    &

Hello,​W1209 W1219 W3230 boards and several others of Chinese origin are usually equipped with STM8S003. But I got a board with ES7P003FGTF.​It looks like a PIC inside the body of an STM8. Programming system uses Data and Clock, and no capacitor pin for filter.Is there any advantage of STM8S003 over ES7P003?​​

Hello, I am new to ITC. I use a the TIM4 interrupt as a 10ms time base, using a callback function for the SPL interrupt handler INTERRUPT_HANDLER(TIM4_UPD_OVF_IRQHandler, 23).The callback transmits a UART2 packet to an external device and then waits for a UART2 response packet. The response is received using the UART2_IT_RXNE_OR interrupt and the callback for the SPL interrupt handler INTERRUPT_HANDLER(UART2_RX_IRQHandler, 21).The default interrupt priorities are used for all interrupts: Level 3 (lowest).The dev. environment is STVD and STM8 Cosmic compiler. See the below pseudo code.Problem:The while() loop in the TIM4 interrupt routine blocks the UART2_RX interrupt. Question:Is it good practice to wait for the UART2 IRQ in the TIM4 interrupt routine? Is a nested interrupt setup a good solution, and how to implement this on the STM8S MCU? Section 6.5.2 in the reference manual is brief. Thank you!

I have STM8LDiscovery (with STM8L152C6T6 CPU). I need to continuously read 2 ADC channels with writing the data to the memory.I'm doing my project in IAR EW for STM8 v. 3.11.4.I run into the problem: channels data (ADC_DATA) continuously exchanging their places, so ADC_IN0 can be writen to either ADC_DATA[0] or to ADC_DATA[1] and vice versa for ADC_IN1. Moreover: ADC overrun error (ADC1_SR.OVER) is apearing right after the start of the application and never go away.Looks like ADC and DMA works not in the sync. As there is overrun error in the ADC status register I assume that DMA works slower than ADC producing the conversion data.DMA writes exactly 2 words of memory. I already have tested it by increasing the ADC_DATA array size.My ADC and DMA configuration looks like this: unsigned int ADC_DATA[10]; // ADC1 clock enable CLK_PCKENR2_bit.PCKEN20 = 1; // DMA1 clock enable CLK_PCKENR2_bit.PCKEN24 = 1;

I am attempting to configure the UART2 peripheral of the STM8S105C4 MCU with an even parity control using this development environment: ST Visual Develop, ST Visual Programmer, STM8 Cosmic compiler, Library: STM8 Standard Peripheral Library (SPL).Problem: No parity bit generated, as shown by the Logic8 logic analyzer. See the below screenshot: the parity bit is configured but is missing in the signal. Question: why is the Parity Control not working? The following SPL function UART_Config() should configure one even parity bit per byte.Thank you!static void UART_Config(void) { /* UART2 configured as follow: - BaudRate = 38400 - Word Length = 8 Bits - Two Stop

I need an active high UART signal. Yes, the STM8S UART2_TX signal is active, but for hardware reasons I must invert the active low PCB output (UART2_TX). An easy solution would be a programmable STM8S feature to invert the signal. The reference manual does not list that option. Is that correct? Thank you for your response.

The following features require in the microcontroller Flash memory size 4k maxData RAM size 256 bytesEEPROM size 64 bytesTwo 16-bits timersI2C protocol supported External clock supported20 GPIOIf third timer can operate on 32 768 KHz External crystal then it is more preferablewhich have this featureno issue with SOP OR TSSOP 28 etc

I need some help with getting started with the ST motor control system. I have the STEVAL-SPIN3204 evaluation board. I have gone through the instruction manual and getting-started guides but these are not helping.I installed the ST X-CUBE-MCSDK as instructed (tried both version 5 and 6) but the motor profiler does not list this evaluation board as an option or any board with STSPIN32F0B.Is there and SDK or tool set that does support the board ?RegardsShane

I need to configure stm8 with nrf24 and iButton. So basically when the iButton is scanned , the address of it send to master node via nrf24 . Any suggestions how I can proceed ? Thanks

I'd like to know if this e-mail address is active

I'm trying to figure out how to program the STM8L Discovery kit, and the manual (UM1014 User manual) states that I have to download the file STM8L-Discovery_Dev.zip, but it is nowhere to be found on the site: www.st.com/stm8l-discovery .I found a topic here fom 2011 explaining this, but the firmware section described does not exists (any more?)

I'm seeing a lot of conflicting information on STM8S longevity and I'm trying to find some confirmed information. On the STM8S series page, it states that the STM8S series is in the 10-year product longevity program: https://www.st.com/en/microcontrollers-microprocessors/stm8s-series.html. However, the current list of 10-year longevity parts does not include any STM8 parts: https://www.st.com/content/st_com/en/about/quality-and-reliability/product-longevity.html#10-year-longevity.Could someone from ST clarify the situation? I know the entire STM8 series has really long lead times right now, but I'm just trying to find out what the start date was for the 10-year longevity co

The STVD Debugger is missing the ST-LINK and STice support package. Where can I find it? Thank you!Error: When starting the Debugger the following sequence of error messages must be cancelled exactly for times, then the Debugger starts.