PlatformIO I2C Proof of Concept for VSDSquadron Mini

  • VSDSquadron Mini
  • I2C compatible devices or another VSDSquadron Mini set as the counterpart (Master/Slave)
  • USB to UART converter for programming and power
  • Jumper wires for connections
  • PC1 (SDA) to SDA
  • PC2 (SCL) to SCL
  • GND to Ground
  • 3.3V to 3.3V
  1. Install PlatformIO Core : Begin by installing PlatformIO Core on your system according to the official PlatformIO documentation.
  2. Project Commands :
    • Build the project: $ pio run
    • Upload the firmware: $ pio run –target upload
    • Clean build files: $ pio run –target clean
  • USART_Printf_Init() : Initializes the USART peripheral for debugging.
  • Delay_Ms() : Creates a delay for a specified number of milliseconds.
  • USART_SendData() : Sends data through the USART peripheral.
  • USART_ReceiveData() : Retrieves the most recent data received by the USART peripheral.
  • USART_GetFlagStatus() : Checks the status of specified USART flags.
#include "debug.h"

/* I2C Mode Definition */

#define HOST_MODE 0

#define SLAVE_MODE 1

/* I2C Communication Mode Selection */

#define I2C_MODE HOST_MODE

/* Global define */

#define Size 6

#define RXAdderss 0x02

#define TxAdderss 0x02

/* Global Variable */

u8 TxData[Size] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06};

u8 RxData[5][Size];

void IIC_Init(u32 bound, u16 address) {

GPIO_InitTypeDef GPIO_InitStructure;

I2C_InitTypeDef I2C_InitTSturcture;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

// SCL Pin Configuration

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOC, &GPIO_InitStructure);

// SDA Pin Configuration

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;

GPIO_Init(GPIOC, &GPIO_InitStructure);

// I2C Peripheral Configuration

I2C_InitTSturcture.I2C_ClockSpeed = bound;

I2C_InitTSturcture.I2C_Mode = I2C_Mode_I2C;

I2C_InitTSturcture.I2C_DutyCycle = I2C_DutyCycle_2;

I2C_InitTSturcture.I2C_OwnAddress1 = address;

I2C_InitTSturcture.I2C_Ack = I2C_Ack_Enable;

I2C_InitTSturcture.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

I2C_Init(I2C1, &I2C_InitTSturcture);

I2C_Cmd(I2C1, ENABLE);

}

int main(void) {

SystemCoreClockUpdate();

Delay_Init();

USART_Printf_Init(460800);

printf("SystemClk:%d\r\n", SystemCoreClock);

printf("IIC Host mode\r\n");

IIC_Init(80000, TxAdderss);

#if (I2C_MODE == HOST_MODE)

// Host Mode Operations: Master sends data to Slave

for (int j = 0; j < 5; j++) {

// I2C Master Transmit Sequence

}

#elif (I2C_MODE == SLAVE_MODE)

// Slave Mode Operations: Slave receives data from Master

for (int p = 0; p < 5; p++) {

// I2C Slave Receive Sequence

}

#endif

while (1);

}
  • IIC_Init Function : Initializes the I2C peripheral, including setting up the GPIO pins for I2C functions (SCL and SDA) and configuring I2C parameters such as clock speed, addressing mode, and duty cycle.
  • Main Function :
    • System Initialization: Updates the system core clock and initializes delay functions and USART for debugging.
    • I2C Mode Selection: The code can operate in either HOST_MODE or SLAVE_MODE, determined by the I2C_MODE macro. This allows for flexible testing of both master and slave operations.
    • Host Mode Operations: If in HOST_MODE, the device is configured as an I2C master, initiating communication with a slave device to transmit a series of data packets.
    • Slave Mode Operations: If in SLAVE_MODE, the device acts as an I2C slave, ready to receive data packets from an I2C master.

https://github.com/davidbroughsmyth/vsdsquadron-mini-research/tree/main/I2C_poc

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