STM32 HAL I2C EXAMPLE CODE 1 AREA

Follow the following animation, open to watch. Install software pack for platform, for example STM32F030xxx. Install MDK-ARM lastest version. MDK-ARM Setup by STM32CubeMx.

Stm32 Hal I2C Example Code 1 Area

See more stm32f4 i2c interrupt example stm32f4 i2c hal example stm32 i2c interrupt.In this post, I talk mostly about displaying to graphics devices. In an application where the STM32 is slave transmitter receiver the. Code add this two lines for blinking IO in user code 1 area: HALGPIOTogglePin (LEDGPIO.

As always, working code can be found in my github. And we’ll get a closer look at the STM32 I2C hardware module and its internal functionalities, modes. Starting with an introduction to the Inter-Integrated Circuit (I2C) communication. In this tutorial, we’ll be discussing the I2C hardware in STM32 microcontrollers. Temperature sensors, memories,… anything.STM32 I2C Tutorial HAL Code Examples Slave & Master DMA Interrupt.

SPI OLED display ($2.50). STM32 I2C Scanner HAL Code Example DeepBlue. I2C OLED display based on SSD1306 (~$2.50)The I2C Scanner example is a very common Arduino sketch example to scan the I2C bus for available devices. We can call the STM32 HAL functions (e.See more: stm32f4 i2c interrupt example, stm32f4 i2c hal example, stm32 i2c interrupt example, stm32f103 i2c example, stm32 i2c dma, stm32f4 i2c slave example, stm32 i2c example code, stm32f4 i2c master tutorial, Four Simple Page Layout Designs using only 5 dif, http 172.27 2.5 internal nid index php, python read write simple database. What parts will I be using?This example describes how to perform I2C data buffer sequential transmission/reception between two boards using. The interesting stuff I wrote to put it together is in main.c.

Bigger display, not as bright, lower resolution, but still very nice. Nokia 5110 display ($2). They put SPI in the title, since the underlying hardware supports SPI. If you see only 4, it’s the I2C variant.

When I do this, things work, more detail below. The I2C clock has to be enabled before GPIOB is enabled. There are two steps for solving the problem: (see section 2.13.7 of the link). I used this in my previous post.The biggest gotcha, which I haven’t entirely overcome, is a bug in STM’s i2c hardware. A logic analyzer module is helpful for getting things to work (~$5).

In I2C1 section, enable to I2C (PB6 and PB7 will become your clk and data pins connecting to the modules SCK and SDA pins respectively) Actual code can be found here. It would have been nice if ST had given more than pseudo code. Do the workaround mentioned in the eratta.

2Since I’m basing this project off of my last post (part 3), UART is still on. I2C address space is only 7 bits wide, so only 128 addresses to look at. Scanning I2C to see what respondsThe code below does a roll call through all I2C addresses to see who’s alive. Otherwise, the settings are the same as in my previous post.After clicking on the generate source code button, you’ll want to move these lines ( see my github code if this isn’t clear enough)Otherwise, the I2C busy flag will be stuck high and the I2C transmits will not work.

In a nutshell, once you have it configured, you can use code like this:U8g2_SetFont(u8g2, u8g2_font_ncenB14_tr) This is actually the spi version, but it’s the same hardware otherwise.What are the pages that are being looped through? In order to save memory/RAM space, you can tell setup to only save 128 or 256 bytes at a time. You should start with this doc page. These are the things I’ll focus on here. Luckily, someone else has already done this and much more in the U8G2 library.Setting up U8G2 is actually pretty easy once I figured out a couple things that aren’t in the doc. According to the SSD1306 datasheet, section 8.1.5, this makes sense 3 So how do you convince the display to display something?Looking through the datasheet, I can’t really make heads or tails of how to configure this thing and tell it to display stuff.

The setup function is basically a class constructor. The u8g2 variable is basically a class object. I’m using the c api there’s also a cpp variant. You can find my actual code on github, (look for u8x8_byte_my_hw_i2c, u8x8_byte_my_hw_spi, and u8x8_gpio_and_delay_mine).U8g2_t u8g2 // a structure which will contain all the data for one displayU8g2_Setup_ssd1306_i2c_128x64_noname_2(&u8g2, U8G2_R0, u8x8_byte_sw_i2c, u8x8_gpio_and_delay_lpc11u3x) // init u8g2 structureU8g2_InitDisplay(&u8g2) // send init sequence to the display, display is in sleep mode after this,U8g2_SetPowerSave(&u8g2, 0) // wake up display

The first two arguments are easy, the class object and an enum value telling the library whether display is rotated in your application. This is why you have to redraw everything for each “page”. _1 means use 128 bytes for display, _2 means use 256, _f means store all pixels. The number that the function name ends with (_2, in this case, right after the noname) controls how much memory/RAM you want to use for graphics. The I2C version has I2C in the name, the SPI version omits this 4 SSD1306 is only one of many that are supported.

It’s the easiest of the two… because it doesn’t need to do anything. They’re easy.I’ll start with the second of the two function pointers. At First, I was a little confused about what should go into these, but I figured it out with the help of gdb and stlink.

So it begins with this buffer of bytes to send: My function also has the oled’s i2c address hardcoded 7. So my function carries a bit of state from call to call to collect the bytes. Initialize the necessary pins, start/end transfer…Because this first example uses i2c and because this interface may be software implemented, (ie bit swizzling, which mine is not), the messages are broken into: here’s the device address, here’s a byte, here are some more bytes, ok go ahead and send. As another example implementation, you might look at the u8x8_byte_4wire_sw_spi function in u8g2.Which translates into a function like this:And again msg is basically an enum 6, telling the function what to do.

The number of bytes is in the arg_int argument. U8X8_MSG_BYTE_SEND: this one gives me bytes. I just set my buffer length/index to 0 U8X8_MSG_BYTE_START_TRANSFER: ok, it’s about to send the function some bytes. This is not relevant for I2c but will be important in the SPI version.

For the full implementation, see my github. Now it’s time to actually send the data.While(HAL_I2C_GetState (&hi2c1) != HAL_I2C_STATE_READY) HAL_I2C_Master_Transmit(&hi2c1, addr, vals, length, 10) I’m only including the interesting code here. U8X8_MSG_BYTE_END_TRANSFER.

Here’s an example I lifted from jandelgado’s github. Hello worldThere are a bunch of graphics primitives. So what are the things you can display?The basic template for display with u8g2 is:Now we need to populate the “what you want to draw” part.