PSoC™ 6 Forum Discussions

Dear PSOC-community,

i'm just beginning embedded development so bear with me. I'm trying to connect a I2C Ambient light sensor(ALS) (https://cdn-learn.adafruit.com/downloads/pdf/adafruit-veml7700.pdf, https://www.vishay.com/docs/84286/veml7700.pdf) to a PSOC6 (CY8CPROTO-063-BLE) via the I2C Bus.

The code is based on "PSoC 6 101: Lesson 2-1a Basic UART Implementation"(https://www.youtube.com/watch?v=ZJOF2f423nI&t=148s). And i got an UART component running and printf-printing to a terminal(via the KitProg UART). Lovely tutorial! 🙂

I then attempt to use the high level I2C master interface to an I2C-block .(https://infineon.github.io/psoc6pdl/pdl_api_reference_manual/html/group__group__scb__i2c__master__high__level__functions.html)

Main code reads as follows:

#include "project.h"
#include <stdio.h>
#include "cy_scb_i2c.h"

#define ALS_slave_addr 0x10 // I2C address for 

uint8 wbuf[1] = {0x04}; // i2c write buffer with read ALS command
cy_stc_scb_i2c_master_xfer_config_t i2c_write = {
    .slaveAddress = ALS_slave_addr,
    .buffer = wbuf,
    .bufferSize = 1,
    .xferPending=true // after write do not generate stop condition
};

uint8 rbuf[2] = {0x12, 0x34}; // i2c receive buffer with dummies
cy_stc_scb_i2c_master_xfer_config_t i2c_read = {
    .slaveAddress = ALS_slave_addr,
    .buffer = rbuf,
    .bufferSize = 2,
    .xferPending=false
};

int main(void)
{
    __enable_irq(); /* Enable global interrupts. */

    /* Place your initialization/startup code here (e.g. MyInst_Start()) */
    /* UART and printf to UART */
    UART_Start();
    UART_PutString("\r\nUART of PSOC6 has started!\r\n");
    setvbuf(stdin, NULL, _IONBF, 0); // unbuffered stdio(printf)
    
    /* I2C init */
    I2C_Enable();
    I2C_Start();
    printf("I2C_MasterGetStatus: %lX\r\n", I2C_MasterGetStatus());
    
    cy_en_scb_i2c_status_t i2c_status;

    for(;;)
    {
        /* Place your application code here. */
        Cy_SysLib_Delay(1000);
        UART_PutString("Hello from UART\r\n");
        printf("Hello from printf!\r\n");
        
        i2c_status = I2C_MasterWrite(&i2c_write);
        printf("I2C status upon write: %lX\r\n", i2c_status);
        while(0u == (I2C_MasterGetStatus() & CY_SCB_I2C_MASTER_WR_CMPLT_EVENT)) {
            ;;
        }
        printf("I2C write complete.\r\n");
        
        I2C_MasterRead(&i2c_read);
        while(0u == (I2C_MasterGetStatus() & CY_SCB_I2C_MASTER_RD_CMPLT_EVENT)) {
            ;;
        }
        // look into read buffer to get ambient light
        uint16 val = *((uint16*)i2c_read.buffer);
        printf("Ambient light = %X\r\n",val);
    }
}

Output in terminal is:

"UART of PSOC6 has started!
I2C_MasterGetStatus: 0
Hello from UART
Hello from printf!
I2C status upon write: 0" (then hangs at: CY_SCB_I2C_MASTER_WR_CMPLT_EVENT(?))

I tried to put a scope to the I2C clock line, but cannot see any activity (remains high). I have quadruple checked the wiring (note, the Adafruit breakout board for the sensor comes with I2C pullup resistors!), and believe that i must miss something in the code (?)... Can anyone see if i am using the I2C API Correctly?

Kind regards, Erik

Dear team,

I am trying the UART code but I am modifying the code by sending a string again and again that time he is only one time asking to user.

so I want to again and again ask to the user. I also put a while (1) loop but still itis not working. so please any uart example for sending new strings again and again.

Hola comunidad, quiero hacer funcionar mi sensor ultrasonico HC - SR04 en mi CY8CPROTO-062-4343W , pero no encontre ningun proyecto que trabaje en Mouds Toolbox, me podrian ayudar?

Hi

I am exploring how to change the configuration of GPIO between input and output in run time.

I could not figure out the effect of the buffer: What is the difference between CY_GPIO_DM_PULLUP_IN_OFF and CY_GPIO_DM_PULLUP?

Also, if you want to switch the GPIO between input and output within the program, what is the proper hardware connection and setting to sue ?

thanks