About CK.3

CK.3 · 2022-01-05

I am using about 13 (PCA9554A & PCA9554AD) I/O expander IC to connect sensors to STM32 F103 micro-controller through I2C. Upto 3 PCA9554 IC works fine, but the moment I connect 4th IC, it starts to dump 255 from all the i/O Expander ICs.The data is l...

CK.3 · 2021-10-18

I am porting the code from ATMega128 to STM32F103 for faster throughput to WIZNET W5500 using the WebServer.C for ATMega128. I am using the HAL coding as I am new to STM32. While the throughput is faster than the ATMega128 but I need more speed. Cha...

CK.3 · 2021-10-03

I am new to STM32. I am porting my code from ATMega128 to STM32 for faster thru put . I have to connect W5500 to STM32F103 on SPI2. To test my understanding of SPI on STM32 after compiling , a small test code in while loop. SPI_Write(S0_CR,CR_CLOSE)...

CK.3 · 2022-01-07

Tried out all as suggested by TDK & Neil. The problem was finally solved. Checked 3.3Volts on the nearest I2C board and the far away board to be 2.98V. Did not take it seriously. After having tried out all possibility, ran two wires (3.3V and ground)...

CK.3 · 2022-01-05

HAL_I2C_Master_Transmit(&hi2c2,0x44,0, 1,1); err = HAL_I2C_Master_Receive(&hi2c2,0x44,&data, 1,1); if ( err != HAL_OK ) { defect_PCB = 3; } else PU_Array3 = data; This how each I2C slave is addressed with Error handling but...

CK.3 · 2021-10-31

Tried all as suggested and monitored on scope. With timer interrupts operating atleast 4000 times a second, tacho interrupt for speed and 2 PWM operating in back ground in addition to I2C to scan the 32 sensors at least 150 times a second.Finally ac...

CK.3 · 2021-10-21

As suggested tried concatenating strings to send as large packets but resulted in the continuous flow of data (repeat of data) without any end.sprintf(temp_buffer,"%d/%d/%d %d:%d:%d Dt:%d/%d/%d %d %u Ar: %d/%d %d/%d %d/%d %d/%d %d/%d %d/%d %d/%d %d/...

CK.3 · 2021-10-20

The I2C is operating at 400KHz, may be this is the reason that is delaying/ missing the packet transmission, while SPI operates at 16MHz. As TDK suggested may have to consider concatenating the packets. But concatenating the packets which I have n...

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I2C dumping 255 as data instead of actual Values

Need for Speed Using STM32 SPI with DMA to W5500.

Problem connecting SPI to

Re: I2C dumping 255 as data instead of actual Values

Re: I2C dumping 255 as data instead of actual Values

Re: Need for Speed Using STM32 SPI with DMA to W5500.

Re: Need for Speed Using STM32 SPI with DMA to W5500.

Re: Need for Speed Using STM32 SPI with DMA to W5500.