STM8 MCUs

Posted on March 09, 2013 at 00:43Hi, It is written we can find a online help file ''stm8s_fwlib_um.chm'' in the document UM0834 for the STM8S-DISCOVERY, in chapter 3.1.2.Where can I get it exactly????Thanks in advanceS.K #help-file

Posted on March 09, 2013 at 09:28Hi , I'm using STM8L151C4 in my design. I have interfaced this with I2C EEPROM M24512FDW (ST make). Plz refer attachment for the schematic.  I had pulled the enable lines of the EEPROM ( E0, E1, E2) to high (3.3V) & set the slave address of EEPROM as 0XAF. I'm using R-Link Compiler (Raisonnance) & using its sample i2C code.   The problem is that the micro is not able to reach the slave EEPROM & the code hangs. I could not understand the reason for this behaviour. Could you help me out of this issue. Thanks Arunkumar.S

Posted on March 07, 2013 at 13:01 Hi All, I am using the STM8L152 to generate a PWM, with it's duty cycle depending on current flowing through a relay coil. I have achieved this using the ETR input, with the following code: /* Time base configuration */ TIM1_TimeBaseInit(TIM1_PRESCALER, TIM1_CounterMode_Up, TIM1_PERIOD, TIM1_REPTETION_COUNTER); /* Toggle Mode configuration: Channel1 */ TIM1_OC1Init(TIM1_OCMode_PWM2, TIM1_OutputState_Enable, TIM1_OutputNState_Disable, CCR1_Val, TIM1_OCPolarity_Low, TIM1_OCNPolarity_Low, TIM1_OCIdleState_Set, TIM1_OCNIdleState_Set); //TIM1->CCMR1 |= 0b10000000; // Turn on ETR clear TIM1_ETRClockMode1Config(TIM1_ExtTRGPSC_OFF, TIM1_ExtTRGPolarity_NonInverted, 0x00); //TIM1->SMCR |= (1 << 3); //TIM1_SelectInputTrigger(TIM1_TRGSelection_ETRF); TIM1_SelectSlaveMode(TIM1_SlaveMode_Reset); TIM1_OC1PreloadConfig(DISABLE); /* Enable TIM1 outputs */ TIM1_CtrlPWMOutputs(ENABLE); /* TIM1 enable counter */ TIM1_

Posted on October 08, 2012 at 20:33I did not expect for that !

Posted on March 04, 2013 at 21:14Was using STVD successfully for a couple of projects on two different machines.  One machine is still working fine.  I cannot create a new project targeting either the Raisonance Tool Chain, or any other tool chain (assembly only included) because in all cases, the MCU Selection List is Empty.  Have reinstalled versions 4.3.1 and 4.3.3 several times.  I can compile with Raisonance using an old project where the MCU is still selected, but cannot link because the -P option for rlstm8 is not present (the -P option is there on the machine that works, and without it, the Raisonance linker complains about the demo period being over). I have noticed that after reinstalling, all my recent lists are still present in the ide as well as several other options selected while running.  I'm guessing that the inability to load the mcu list is related to not complete

Posted on March 04, 2013 at 16:33I'm using Cosmic Eval C Compiler V 4.3.7. The code of concern is as follows: if( RST->SR & (u8)0x02 == (u8)0x02) {....} I'm simply checking bit 1 of the reset register. I checked the disassembler because the program was not working as expected and this is what I found: main.c:215  if( RST->SR & (u8)0x02 == (u8)0x02){ 0x9272 <.ckResetForIWDG+12> 0xC650B3        LD    A,0x50b3            LD    A,0x50b3 0x9275 <.ckResetForIWDG+15> 0xA501          BCP   A,#0x01             BCP   A,#0x01 0x9277 <.ckResetForIWDG+17> 0x275F     &nbsp

Posted on January 04, 2013 at 16:43 Reallystupid problem - toolchain provide info about final size of code module to be loaded in MCU flash ... Wrote a direct complain to Cosmic support, they answered: As the software is a free software, there is no direct support. Support is done via the discussion forum on /public/STe2ecommunities/mcu/default.aspx That's isnt dumb and headless ? Sorry.

Posted on February 24, 2013 at 09:08I have one strange problem. After this fragment of code program:b = a;a =/ 40;if(!a)//breakpointsthe results of two registers are: b = 50000 - good value, a=0The value of a should be about 1250 not 0!!I can't find place in my program where i change value of a, because I use it only in one place. Any suggestion how can I find solutions of this problem? #incorrect-expectations #wrong-value-register-bug #optimisation

Posted on February 28, 2013 at 09:31Good day, I configure PortB PB2, PB3 and PB4 as inputs, pull-up, no ext int. These pins work 100% no problem. I also configure PortC, PC0 and PC1 precisely the same as the above pins but the pull-ups is not connected. Can anybody tell me what to do to get the pull-ups activated. See my configuration code below. #define ADDR_GPIO_PORT     GPIOB #define ADDR1_GPIO_PIN  GPIO_Pin_2 #define ADDR2_GPIO_PIN  GPIO_Pin_3 #define ADDR3_GPIO_PIN  GPIO_Pin_4 #define ADDRn_GPIO_PORT     GPIOC #define ADDR4_GPIO_PIN  GPIO_Pin_0 #define ADDR5_GPIO_PIN  GPIO_Pin_1   GPIO_Init( ADDR_GPIO_PORT, ADDR1_GPIO_PIN, GPIO_Mode_In_PU_No_IT);   GPIO_Init( ADDR_GPIO_PORT, ADDR2_GPIO_PIN, GPIO_Mode_In_PU_No_IT);   GPIO_Init( ADDR_GPIO_PORT, ADDR3_GPIO

Posted on February 20, 2013 at 21:35We can I download the STVP and STVD software packages for STM8L MCU?  There are no links on the site? #stvd #stm8l #stvp

Posted on February 20, 2013 at 20:58hello, after long trying, i managed to write to the pcf8574 in assembly language. no i have only a problem with WRITING to the DS1307, i can read the DS1307 my question is, when you use a crystal of 14.7456Mhz, what are the correct settings in the freq ,and ccrl registers, because i have connect the DS1307 to the AARDVARK and i can write and read. are there special precautions for write to a DS1307 many thanks marc debruyne #duplicate-thread

Posted on January 30, 2013 at 11:34hello, i try to make a connection between the stm8s207 and an pcf8574. the problem is with the software, because i can control the pcf8574 with an AARDVARK analyzer. when i send a start and an adress (40) for pcf8574 then i do not see any pilses on PE1 and PE2 i use a crystal of 14.7456Mhz because of the UART. please take a look at the attached assembly file. and ,let me know what i doing wrong. many thanks marc debruyne

Posted on March 19, 2012 at 19:01I trying to develop device using STM8S105K6 MCU and found something very strange. If I press reset button (connecting NRST to GND) all if working fine. But If I just turn off/on device power, MCU is starting (timer is working, LED is flashing, and so on), but SPI is not working (to be more exact, it not clears TXE flag). This is my code for init:      SPI_CR1_bit.BR = 1;      SPI_CR1_bit.MSTR = 1;      SPI_CR1_bit.CPOL = 0;      SPI_CR1_bit.SPE = 1; This is a little bit later in main:          SPI_DR = 0x55; // test          while (!SPI_SR_bit.TXE) { // here we got infinite loop :(           &n

Posted on February 01, 2013 at 12:05Hi. I'm using the Cosmic STM8 compiler (''free'' version, v4.3.9) and it appears to generate unexpected results for the following test :- static char test(unsigned int x, unsigned int y) {    return (int)(x - y) < 0; } This function unexpectedly returns 0 when presented with the values x=0x7f80 and y=0x8080. If I modify the function thus is then returns 1 as expected :- static char test(unsigned int x, unsigned int y) {    x -= y;    return (int) x < 0; } Am I misunderstanding what the result should be ? P.

Posted on July 17, 2011 at 21:55I've pored over the user guide and various app notes but cannot seem to get the RTC wakeup timer to start running, so no WU interrupt and I get stuck in halt mode. Can someone give me a difinitive checklist of what register bits need to be set/reset to get the timer started. I need to check that what I think I should be doing from reading the user manual is right. Many thanks Jeremy

Posted on September 04, 2012 at 12:36Hello everybodyI'm trying to program 2 STM8L151 at the same time using 2 ST-Link/V2 and 2 STVP-Cmdline.exe calls, but I can't. Is there any way to get it?.Thank you in advance

Posted on January 13, 2013 at 18:58 I wanted to see how fast the gpio pins can be 'pulsed', so I created the following piece of code: /* Switch to 16Mhz Crystal Osc clock */ CLK_ClockSwitchConfig(CLK_SWITCHMODE_AUTO, CLK_SOURCE_HSE, DISABLE, DISABLE); /* Output Fcpu on CLK_CCO pin */ CLK_CCOConfig(CLK_OUTPUT_CPU); GPIO_DeInit(GPIOD); GPIO_Init(GPIOD, GPIO_PIN_3, GPIO_MODE_OUT_PP_LOW_FAST) while (1){ GPIOD->ODR |= (uint8_t)(GPIO_PIN_3); GPIOD->ODR &= (uint8_t)(~GPIO_PIN_3); } Then I connected a scope on the output of GPIO D3 and the CCO output: As you can see, about 6 cycles are needed to turn a GPIO on and off, resulting in 16Mhz/6 = 2.6667 Mhz

Posted on January 14, 2013 at 00:37Hello everybody,I'm newbie at STM8A. I'm using IAR IDE. I downloaded stm8peripheral from st web site and I'm trying to use template project in the file. Firstly, I wanted to use TIM4 and I copied all file in the examples file(in TIM4 directory). I'm using IAR in Simulator mode now, but until now it can't work.While I was searching, I saw some difference interrupt handler between mine and the others.In my file interrupt handlers are like below : INTERRUPT_HANDLER(TIM4_UPD_OVF_IRQHandler, 23){   /// code here}But the others use ''#pragma vector''. It couldn't work in my project.Can anybody tell me how can I use interrupts in IAR and if possible someone give a simple template project, it will be very useful for me.

Posted on December 28, 2012 at 12:18hello, following is the short details about the objective of the program..and their after the problem what i am facing... I am using stm8s005c6t6 controller and  we are using capacitive based power supply (lm7805) regulator is connected at the unregulated dc to get the 5v supply. I have connected PORTA pin 1 to drive the relay. Since relay takes 30mA of current....so when ever relay has to be switched i send the controller to active halt mode with master frequecy set to LSI 128khz and AWU with delay of 0.5S...and in the interrupt routine of AWU i will first switch off the relay and then switch the frequency to again HSI-16mhz. Problem:- when i set PA1 and goes into active halt mode, PA1 automatically goes to zero...and after AWU wakeup interrupt...PA1 come back to high state...if i use any other port instead of PA1 it works fine...but the issue is only with PA1.....i am not able to

Posted on December 19, 2012 at 16:45Respected All:           I new for STM8s003k3 and i compile the peripheral coding like GPIO,USART ..But i did not not got Hex file.And i use the STVD compiler.Can any one tell me how create a hex file.i Read the Pdf of STVD but i did not got clear idea about the pdf.So,any one tell me the step to be followed to create the HEX file.......   Thanks in Advance.. #stm8-compilers

Posted on October 23, 2012 at 13:02hello, i'm trying to play raw pcm (22050 Hz, 8 bit unsigned, mono) from sd card to DAC through DMA, with ring buffer. everything works perfectly when i'm using TIM2 as interrupt source (at 22050 Hz) and DAC's software trigger. but i really need to use DMA because of resource-critical timer's interrupt. so, i used stm8l-discovery's wavegenerator example - initialization code copypasted almost unchanged, except of using DAC's circular mode - i don't use it because of playing data stream, not periodic waveform.http://pastebin.com/RnHaUqLr i'm filling ring buffer in eternal cycle in main() when the half_buf flag equals ''1''. i reset the flag after reading sd sector (512 bytes) and setting the flag in DMA channel 2-3 interrupt when counter i==3 and half transfer interr

Posted on July 07, 2012 at 14:41hello, i have done other MCUs like 8051, PIC, AVR. now i want to use this MCU.  i want to start with STM8Sxxxx series..please suggest me how to start.thanks in advance.

Posted on December 17, 2012 at 22:07I'm willing to init UART in asm and not sure is it required to configure specific IO port pin as  output pin with Px_DDR and only then then I can use UART_TX  or the pin configures in output type automatically when UART is enabled in UART register? Example: There is shared UART1_TX/PA5 pin. After reset it is ''input'' - PA_DDR = $00 I want to use UART1 - prior that do I need this code or not?:        ld     A,♯%00100000 ; makes PA.5 - output      ld      PA_DDR,A   #stm8s-uart-asm

Posted on December 11, 2012 at 16:08Hello, attached is a picture of the power input of my circuit and the protection diodes I have implemented. This is an automotive device with a 12V nominal input, that will get voltage spikes of up to 60V during engine ignition. I am using STM8AF52A8.Looking at the schematic I attached, the input voltage from the car battery is on the left side of the fuse. On the right side of the fuse is the 12V input to the voltage regulator (not shown on schematic).To protect the regulator, I have implemented a series of 2 TVS diodes. The bottom diode is rated for 3.3V reverse standoff, and the top diode is 18V reverse standoff. In between these diodes is a 250 Ohm resistor input to the STM8A mcu (port pin PE1). The purpose of this circuit is to detect the high voltage caused by engine ignition on Port Pin PE1 of the mcu.From the STM8A datashe

Posted on November 29, 2012 at 14:24Hello! Now I'm in search of design of my project and I really going to use STM8s208 MCS's. Im'm new to STM8 at all.I need a wired controller network, with about of 20 devices. Every device should be able at any time to send a short message adressed to another controller or a broadcast message. Also, I should me able to program any controller using only this network (no programmers/devices, only via bootloader).So, main needs need addressing, broadcasting and bootloader.I have some questions about STM8 MCUs CAN features.1. Do I need to write a low-level code to form CAN frames, Or I only give and get 8-bytes data arrays in my program?2. Does beCAN support adressed mesages or I would need to use a special high-level protocol?3. What about programming only one of twenty devices connected with network? Again, adressing needed. Should I write my own bootloader for