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1. STM8 COSMIC TUTORIAL DRIVERS
2. STM8 COSMIC TUTORIAL MANUAL
3. STM8 COSMIC TUTORIAL CODE
4. STM8 COSMIC TUTORIAL SERIES
5. STM8 COSMIC TUTORIAL DOWNLOAD

Finally, we turn on receiver and transmitter in Control Register 2. One thing to keep in mind is that BRR2 register must be written before BRR1. According to the bizarre diagram above, we end up with BRR1 = 0x0D and BRR2 = 0x00. We’ll stick with the default 8 data bits, 1 stop bit and no parity. Seriously, what were they thinking? Why couldn’t ST just implement BRR_HIGH and BRR_LOW for the sake of it? All this bit-fiddling just seems unnecessarily complicated.Īnyway, let’s move on to initialization. you get a 16-bit value and you write the first nibble into BRR2, then you write bits into BRR1 and finally you write the remaining bits into BRR2. Usually, in order to initialize UART one has to calculate baud and write the resulting value into the corresponding HIGH and LOW registers. Base address for all the hardware registers is 0x5000 so we can hardcode that into our macro. Control registers CR1 and CR2 are used for configuring internal pull-ups, output speed and selecting between push-pull or pseudo open-drain.įirst, let’s define a macro that we’ll use later on for register definitions. After we configured DDR we can use ODR for writing or IDR for reading pin state. These registers are pretty much self-explanatory but just in case, here’s a brief overview: DDR is the direction register, which configures a pin as either an input or an output.

STM8 COSMIC TUTORIAL MANUAL

Let’s begin by opening the GPIO section of the reference manual and taking a closer look at PORTD registers. Everything else is present in the reference manual: peripheral operation, register description, etc. We’ll use the datasheet for the pinout and register map. These are the two most important documents: datasheet and reference manual. It’s important that you understand what’s going on here, since we’re going to use this mechanism for accessing hardware registers later on. The only difference is that in the first example we know exactly which address in memory we are going to use. bashrc file (replacing usernamewith your user name): I prefer to keep flasher with compiler for convenience. Now extract stm8flash, build it with make and copy stm8flash binary to ~/local/sdcc/bin.

STM8 COSMIC TUTORIAL DOWNLOAD

The first step is to download all the necessary tools:Įxtract SDCC under ~/local/sdcc. To program the microcontroller we’ll be using stm8flash. SDCC is being actively developed, so I suggest trying the latest snapshot build instead of the stable version. Luckily, SDCC supports STM8 and that’s what we’re going to use.

STM8 COSMIC TUTORIAL CODE

Some of these compilers have free versions with code size limit, but none of them are available for linux. There are 3 commercial compilers available for these processors: Raisonance, Cosmic and IAR. The biggest downside is that STM8 processors are not supported by GCC. Note: a 1uF capacitor on VCAP pin is required for the processor to operate. STM8S003F3 comes in a handy TSSOP20 package which is very easy to solder. All you need is an ST-Link v2, STM8S003F3 and a breakout board. Instead, I’ll opt for the minimalist approach. The easiest one is to get a Discovery board, although I wouldn’t recommend it, since STM8 Discovery boards aren’t that good and the on-board ST-Link v1 firmware just sucks. There is a number of ways to start working with STM8.

STM8 COSMIC TUTORIAL DRIVERS

Even though writing peripheral drivers from scratch might seem like reinventing the wheel, in many cases it is easier and faster to implement the functionality that you need for a specific task, instead of relying on vendor-supplied libraries that try to do everything at once (and fail). The main goal of this article is to demonstrate that ‘bare metal’ programming is not a difficult task and to give you an overview of STM8’s architecture and peripherals. Some applications just don’t require that amount of flexibility and performance. Utilizing an ARM Cortex core to switch some lights on and off seems like an overkill. Despite having various ARM Cortex-M0 devices available on the market for quite attractive prices, AVRs have one advantage – simplicity. Initially I came across this part while searching for a simple microcontroller as a replacement for AVRs. STM8 is a cheap 8-bit microcontroller aimed towards low-cost mass-market devices.

STM8 COSMIC TUTORIAL SERIES

This article will cover developing for STM8 series of microcontrolles completely from scratch, without using any vendor-supplied libraries.