SPI with STM32

Summary

Highlights

• Introduction to SPI as a high-speed, synchronous communication protocol. ⚡
• Explanation of SPI architecture, including master-slave setup. 🤝
• Detailed setup guide for SPI on STM32 using CubeMX. 🖥️
• Step-by-step programming and configuration for data transmission. 👨‍💻
• Final demonstration of SPI transmission on an oscilloscope. 📊

Key Takeaways

• SPI is an essential protocol for synchronous data transfer in STM32 series F1. ⚡
• MOSI, MISO, and SS/CS are key components to understand in SPI configurations. 🔌
• Understanding clock polarity and phase is crucial for SPI communication. ⏰
• CubeMX is a great tool for configuring STM32 projects with SPI. 🎛️
• Testing and debugging are vital steps in ensuring SPI communication is set up correctly. 🛠️

Overview

Chapters

• 00:00 - 00:30: Introduction to SPI in STM32 The chapter discusses SPI (Serial Peripheral Interface) in STM32, specifically focusing on the STM32 F1 series. The introduction hints at a prepared document that will be shown and discussed to further explain what SPI is and how it is used in the STM32 series.
• 00:30 - 01:00: Overview of SPI Protocol and Its Importance This chapter introduces the Serial Peripheral Interface (SPI) protocol and highlights its significance in communication systems. It notes that SPI is one of the most important parallel communication protocols due to its high speed compared to others. The SPI protocol is compatible with various modules such as RF and RFID card readers. It is a protocol that operates without interrupts, allowing for continuous sending and receiving of bits as desired.
• 01:00 - 01:30: SPI Protocol Details This chapter explains SPI (Serial Peripheral Interface) protocol, focusing on the aspect of message transmission without interruptions, differentiating it from code-level interrupts. The fundamental SPI communication is structured around a master-slave relationship.
• 01:30 - 02:00: Master and Slave Configuration in SPI The chapter 'Master and Slave Configuration in SPI' discusses the configuration types in the Serial Peripheral Interface (SPI), focusing on the roles of the master and slave devices. It highlights that typically there is one master device in the setup and potentially multiple slave devices, though the simplest configuration involves one master and one slave. Key terms such as MOSI (Master Out Slave In) and MISO (Master In Slave Out) are also mentioned as part of the SPI communication protocol.
• 02:00 - 02:30: MOSISO, Clock and Chip Select in SPI The chapter discusses the components of SPI (Serial Peripheral Interface), namely MOSI (Master Output, Slave Input), MISO (Master Input, Slave Output), clock, and SS (Slave Select or Chip Select). It explains the function of each component, with MOSI being responsible for sending messages from the master to the slave, and MISO handling the output from the slave to the master.
• 02:30 - 03:00: Configuring SPI with Multiple Slaves This chapter covers how to configure SPI with multiple slaves. It explains the role of the master and slave devices in SPI communication, focusing on the synchronous nature of the SPI protocol. The chapter delves into the specifics of using the SS/CS (Slave Select/Chip Select) pin to manage communication with multiple slave devices. When the CS pin is set to zero, the specific slave device will use its internal clock for communication, ensuring synchronization with the master device.
• 03:00 - 03:30: SPI Clock Polarity and Phase The chapter discusses the configuration of SPI Clock Polarity and Phase, particularly focusing on setups involving multiple slaves. It describes a scenario where there is a master device controlling two slave devices using a circuit with two chip select lines. The setup is addressed in the context of having limited output or GPIO options.
• 03:30 - 04:00: SPI Communication Modes The chapter discusses SPI Communication Modes, focusing on the usefulness of a specific configuration where one chip select is used for two slaves. The importance of CLE (Clock Polarity) and CA (Clock Phase) is emphasized, providing an example where 0 is sent.
• 04:00 - 04:30: Using CubeMX to Configure SPI This chapter discusses configuring SPI (Serial Peripheral Interface) using CubeMX. It briefly touches upon interpreting binary sequences and signals as shown on an oscilloscope. The transcript also highlights the four modes available in SPI, focusing on the rising edge mode where the base line is low, and the clock signal is sampled positively during the rising edge.
• 04:30 - 05:00: Testing SPI Configuration This chapter discusses the process and implications of configuring the SPI (Serial Peripheral Interface). It focuses on understanding the behavior of signals, particularly the rising and falling edges of clock signals, which are crucial in determining the output states. The chapter explains how a rising edge indicates a signal transition from low to high, typically resulting in an output state of one, whereas a falling edge, moving from high to low, generally results in an output state of zero. The text highlights the importance of recognizing these signal transitions to effectively manage SPI configurations.
• 05:00 - 05:30: SPI Code Implementation - Part 1 This chapter discusses the implementation of the SPI Code, focusing on how the output values change with rising edge signals. It details how the output alternates between 0 and 1 depending on the condition of the rising edge. The chapter provides specific instances of when the output is zero or one, based on the configuration of the rising edge signals in the system.
• 05:30 - 06:00: SPI Code Implementation - Part 2 In this chapter, the discussion revolves around the implementation of the SPI (Serial Peripheral Interface) code specifically focusing on handling the falling edge scenarios. The initial setup is explained where the rising age is zero and the falling gauge is introduced, likely referring to some form of signal measurement or adjustment. An oscilloscope is used to visualize these signal changes. The clock source is initially in a high state, transitioning through various stages of falling and rising edges, notably alternating between states of 0 and 1. This chapter emphasizes understanding these transitions and their visual representation on an oscilloscope, indicating the presence of Z (possibly a variable or state) in the sequence.
• 06:00 - 06:30: SPI Transmission and Reception Explained This chapter provides an explanation of SPI (Serial Peripheral Interface) transmission and reception. While the excerpt provided is unclear and seems to be a transcription error, it is implied that the chapter might discuss concepts concerning SPI signal timing or edge detection, which are common elements in understanding SPI communication. More specific details would be necessary to generate a more comprehensive summary.
• 06:30 - 07:00: Final SPI Configuration and Circuit Setup In this chapter, the process of finalizing the SPI configuration and circuit setup is discussed. The transcript suggests transitioning to 'cube mix' and creating a project, indicating that the mode for managing SPI settings within the context of a specific project is being outlined. The focus is on ensuring that the configuration aligns with the project's requirements.
• 07:00 - 07:30: Debugging and Watching SPI Data Transmission In this chapter, the focus is on debugging and monitoring SPI (Serial Peripheral Interface) data transmission. The content begins with the speaker instructing how to change an MRO (Master Reset Output) setting to 'C8'. The process involves accessing the system core, navigating to system serial debug, and finally reaching connectivity settings where the SPI1 mode is set to 'full double x'. This chapter outlines the steps necessary for setting and observing SPI data, providing a guide on how to modify and watch the transmission settings for debugging purposes.
• 07:30 - 08:00: Conclusion and Closing Remarks In the concluding chapter, the focus is on parameter settings in a technical system. Key settings include a data size adjustment and a change in pre-scaling to 2506. The clock polarity is set to low, and the clock frequency is established at 1 Hz. The speaker references a document related to these technical specifications. Additionally, there is a mention of accessing the NVIC (Nested Vectored Interrupt Controller) as part of the configuration process.

SPI with STM32 Transcription

• 00:00 - 00:30 hello I am as and in this video I want to talk about SBI as pre for all in stm32 series F1 okay I prepare a document for I want to show that what is SBI and how we use them in stm32 okay go to document and talk about that SP in SD M 32 series F1 one of the
• 00:30 - 01:00 most important parallel communicational is SPI and the speed of that is more than other protocol like your sp sp work with a lot of module like RF RFID card reader and so on if you want to definition of SBI it is a protocol without interrupt and uh we can send and receive any bit we want on constantly
• 01:00 - 01:30 this interrupt is not uh the interupt we have in uh writing code this means uh common I mean we don't have uh something cut is the parallel uh same as send beit as the same time it means without interrupt okay go to next paragraph base of this communication is on master and a slave
• 01:30 - 02:00 we have one always we have one a slave and we have a lot of uh one master and we have a lot of a slave for example Two Three or one it's not important in the simplest stat we have one master and one slave we have m o s i is called it uh Moi uh we have m i s o
• 02:00 - 02:30 misoa is related to clock and SS or CS is related to chip select I write that m o s i or Moi Master output you can see that masteries output and send message for a slave a slave input miso Master input a slave output and you can see that in here
• 02:30 - 03:00 a slave is output and send something for master then Master is input that there SC related to clock because this partical is synchronous SS or CS chip select and in SPI it work when this spin is Select zero this peripheral I mean SP use internal clock and disp synchronous this is for
• 03:00 - 03:30 emphasize and the next uh when we have two or more a slave we can configure uh this master and a slave uh one way is this uh we have one master and two a slave you can see that uh this is the circuit and we have two chips select uh in somehow uh when we don't have uh out or gpio this is really
• 03:30 - 04:00 useful this part or this second configuration is really useful because we have one chip select for two a slave and you can see the thec okay uh next two things in Spa is really important CLE or clock polarity and CA or clock f for example example I send 0
• 04:00 - 04:30 cross 19 the binary is 1 0 0 1 and 0 0 0 0 with SP and see what happened on oscilloscope okay at first uh we have four mode inpi we can use that uh one of them is rising gauge uh I mean that the base is this we have the rising gauge in here and clock sourcing is
• 04:30 - 05:00 zero okay after that when we have a rising gauge this is the output is one and another is uh this is the rising age this is the zero and in this case is falling and this is the rising age we have zero this is the falling gate uh Rising gate you can see that we have one and and in
• 05:00 - 05:30 output I have one 0 0 and one and four Z you can see that when I have Rising gauge the output is one the other Rising gauge output is zero the other Rising aged output is zero the other Rising aged output is one and other Rising gauge is here zero other Rising gauge is zero other Rising age is zero
• 05:30 - 06:00 the other Rising age is zero and we have this part uh the moood two is falling guge uh at first we have falling gauge and you can see that in osilloscope uh the clock Source at first is high uh the following age we have one after that the following age zero after that the following age zero the following age is one and so on we have for Z in
• 06:00 - 06:30 here and in the Cub mix you can see that uh Second following age it means uh the age is set as two age in this case and uh second following is is the one is not and the second is second falling one is not that and two and we have the same
• 06:30 - 07:00 idea and the second riseing gaug you can see that this mode okay go to cube mix and make the project
• 07:00 - 07:30 okay choose your mro I change my mro to C8 and this is it go to system core system serial deug go to connectivity spi1 is mood is uh full double x
• 07:30 - 08:00 Master Okay go to paramet setting and uh data size is this and pre scale change to 2506 and as I talk about clock polar uh polarity is low and clock f is 1 H as I saying my document is about that okay go to to nvic and take
• 08:00 - 08:30 this everything is okay go to SBI to and change mod to full DX slave and choose Hardware NSS input signal for uh chip select uh this part is for chip select and change to this Parts go to nvic and take there
• 08:30 - 09:00 okay then go to the pin configuration and want to see about SPI this is the SPI 1 and this is SPI 2 and you must connect it to m o or uh musy to that musy uh I mean pb15 to p7 and P6 to p14 and P5 to P 13
• 09:00 - 09:30 and one pin is output for chip select or SS uh as I say this pin at first uh select or reset to zero because we want to send something uh change to Output okay everything is okay and change change the project name
• 09:30 - 10:00 to test for example I use the kale copy only necessary Library F and this is the place I want to save it this project um okay everything is all right generate the code
• 10:00 - 10:30 open the project okay this is the SPI go to main that see and you can see that uh type handle the SPI 1 and SPI 2 uh add discod to this project I write it before a notepad
• 10:30 - 11:00 because not enough time to explain what happened but I explain what happened to there okay add to TV and then this is for there I
• 11:00 - 11:30 explain what happened here and then this part to initialize user being two and after that add this part on while to run the code okay that's it go to option for Target debar
• 11:30 - 12:00 setting flash down theti [Music] here and compile the code
• 12:00 - 12:30 okay zero error and zero warming uh at first let's explain what happened uh in private variable B PV I Define data underline Ts for transmit something uh to slave with master master send something to a slave for example I send 1 2 3 4 5 6 7 8 n 10 in 10 bikes or
• 12:30 - 13:00 10 by and Define data underline ARX to receive s slave received this number after that uh I use the inrupt yeah SP interrupt and you can see that this is the structure of that and this line is about uh active again uh receive it a
• 13:00 - 13:30 slave this is it uh and because in RX this number is two because SPI 1 is a slave it transmit something and SPI 2 is uh SBI 1 is Master send something and SBI 2 is a slave receive something this is it we have a right to and and the other thing is for
• 13:30 - 14:00 initialize uh for receive it at we have one two three permit in here perit one is about which SPI we can use for receive SPI 2 as I say and Par two is about data uh we want to receive that and the last one is about size you can see that uh in meanwhile I use Hall online spba
• 14:00 - 14:30 transmit one 2 3 4 we have four Prim in here first is about SPI because uh spi1 is the master and transmit something and you can see that and the two is the pointer is uh point to something we want to transmit something that and the third one is about the size of the uh data and
• 14:30 - 15:00 the last one is about timeout you can set as 100 or 200 you want that and this line I mean white uh is waiting for a transmit and you can see that get state for sp1 and wait for uh transmits prepaid and okay this is wait for uh get State you
• 15:00 - 15:30 can see that uh H underline SBI State ready it's on wait to uh master or transmit again uh prepared to uh send something else this is it and comp okay I forgot something this is my circuit
• 15:30 - 16:00 yeah this is my circuit pb15 connected to pr7 pb14 connected to P6 pb13 connected to P5 and pb12 connected to p uh four this is it and uh let's compile this code and see what happened here okay let's see the what happening to debugger go to
• 16:00 - 16:30 debug and uh go to P where is it Okay click here to T and add to watch one click here to RX and add to again watch one and uh right click here and unit this sck right click here again and unit this sck and you can
• 16:30 - 17:00 see in data TX we have 1 2 3 4 5 until 10 um in RX uh transmit this data to RX okay uh at first reset the program and then compile that again uh sometimes it's happen again reset the program and again compile that you can see that what
• 17:00 - 17:30 happened in here 1 2 3 4 5 6 7 8 9 to transmit for RX is we have this data again this means uh Master transmit and a slave receive that data for example I change uh one of this data for example 10 to 12 okay you can see that the 9 is the change 10 to change to 12
• 17:30 - 18:00 for example 9 change to uh 13 in eight box and you can in uh TS and you can see that what happened eight is changed to 13 okay uh this is the SPI and how to use it in stm32 thanks for watching me please subscribe me bye