Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [tm4c123g]

27 questions
12
votes
6 answers

What is the purpose of PLL in a general microcontroller

An ARM Cortex-M4 based microcontroller like TM4C123GH6PM is designed with multiple clock sources with a processor core clocked at 80MHz provided by the PLL, which, from what've read in NI-What is a PLL? and All About Circuit - What exactly is a…
KMC
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4
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2 answers

shift by 1 bit error in SPI

I am trying to implement the SPI communication on TM4C123. I have 1 board and try to send data from SSI1(master) to SSI0(slave), but I observe that the received value is always shifted to the left by 1 bit!! for example, I send 0x01 on the master…
SH90
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2
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1 answer

Keil debugger exits automatically

I am using Keil uVision5 for programming TI launchpad TM4C123GXL. Keil work perfectly fine for building and flashing the programs (examples projects of Tiva Ware,) but when I start the debug session, at first debugging mode seems to open perfectly…
Masood Salik
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1
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1 answer

How can I write and read consistently in the W5500's registers using the EK-TM4C123GXL with SPI communication?

I used a modified code from an example for SPI communication "spiloopback" from Texas Instruments, where I tried to write data in the registers of W5500 and then read those data. uint8_t masterRxBuffer1[SPI_MSG_LENGTH]; uint8_t…
George P.
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1
vote
1 answer

I2C SCL goes low if using MCU GPIOs as pull-ups

I have an MCU (tm4c123gh6pm) in which I have configured an I2C slave device. At the moment I don't have resistors to wire the required pull-ups, so I want to use two of the MCU's GPIOs for this purpose. I have configured two GPIOs as inputs with…
Martel
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1
vote
2 answers

Experiences with AD9826 serial communication

I try to establish a communication with the TM4C123GXL and the AD9826. For the communication I use the SPI interface of the TM4C123GXL. The SSI Rx and Tx are connected via a 3 kOhm resistor. The AD9826 requires the following timings. With the SPI…
Johannes
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1
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3 answers

Problems reading a signal with a MCU (TM4C123GXL) input pin

I'm tring to read a signal generated by an op. amp. with a microcontroller through an input digital pin. All signals I'm working with are DC. The op. amp. is connected to a light sensor so that it outputs 0V when the sensor is shaded and between 4.8…
Martel
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1
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2 answers

Problem I2C reading RA8875 using TM4C123

I have been working with I2C protocol to create some code for the RA8875 (see for I2C from page 67) using a Tiva board (TM4C123, I2C chapter from page 997), and I was able to paint in the display or writing text, but I am struggling when I want to…
Javier
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1
vote
1 answer

Timers in TM4C123G not working

I wanted to use timers in TM4C123GH6PM (in TIVA C series TM4C123G Launchpad evaluation kit). So I decided to use GPTM TimerA0 in periodic timer mode. I defined the address of the registers of GPTM and followed the steps given in the section 11.4.1…
user3219492
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1 answer

What does "Ethernet PHY Layer 0 Present" mean in TM4C123's datasheet?

I was looking for MCUs that have Ethernet capabilities (ethernet controller) built in. I came across the datasheet of TM4C123GH6PM MCU, which talks about the "EPHY0" bit in one of its registers, which indicates whether the "Ethernet PHY layer 0 is…
Christianidis Vasileios
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1 answer

TM4C123GXL Tiva launchpad: Hardware Fault when debugging in Keil Microvision

I got a weird problem last night. Here is a simple program that uses pin PA7 to drive a LED: #include #include #include "driverlib/sysctl.h" #include "inc/tm4c123gh6pm.h" void PortA_Init(void){ volatile unsigned long…
Nicholas Humphrey
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0
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0 answers

SPI Bit bang to enable/read/write EEPROM from TM4C123GXL

I have checked a few bit bang posts here but still couldn't figure it out. The datasheet of the EEPROM is at: Datasheet of FT93C66A I tried to interface with SPI but to no avail, so I decided to use bit bang instead. The MCU runs at 50MHz so I also…
Nicholas Humphrey
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0
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0 answers

Tiva C microcontroller to DYNAMIXEL servo (UART to RS485)

I am really struggling to establish communication between Tiva C TM4C123GH6PM microcontroller to use Dynamixel servo. Here is the circuit where MAX485 converts UART TTL signal to RS485. This servo has a protocol structure for communication. link for…
Raj Bhatt XP
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0
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2 answers

I2C slave pulls down SCL while doing nothing

I have an MCU (Texas Instruments tm4c123gh6pm) in which I have configured an I2C slave device. I have taken 3.3V from the MCU pin that provides them and connect them to two 4.7 kOhm resistors (to make the pull-ups). I have tried with 2 1.5V…
Martel
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How to read BMP280 "chip_id" using the Tiva TM4C123G SPI communication interface?

Am trying to read the chip_id of the BMP280 Pressure/Tempeture sensor using the Tiva TM4C123G Launchpad thought the SPI communication protocol. To begin with let me provide some back ground info and technical details. Inventory: Tiva TM4C123G…
Alex Roman
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