I am trying to connect my TM4C123GH6PM Microcontroller from Texas Instruments with my Smartphone and use it to control an alarm clock and LED Lights. (the LEDs are controlled over a Transistor, which is controlled over an GPIO Pin). I have some experience with coding in C++ and the TM4C123GH6PM, but I am still learning a lot. So please excuse some foolish mistakes I might have made.
I want to connect the ESP8266 with the Microcontroller using UART and the TivaWare Framework. I have written some code and my UART works correctly (I tested it by sending chars from UART 4 to 3).
According to the AT commands of ESP8266 It should respond to "AT" with "OK". But whenever I send something to the ESP it responds with exactly what I sent to it. I checked the wiring, and that's not The Issue. Or at least I think so. Please correct me, if the wiring is wrong.
ESP -> TM4C123GH6PM:
GND -> GND
VCC -> 3.3V
Tx -> Rx (UART3 / PC6)
Rx -> Tx (UART4 / PC5)
CH_PD -> 3.3V
I also checked for the power consumption of the ESP. Everything is powered by the USB-port of my laptop, since that helps keep the cable mess down. I monitor the power consumption with (https://www.amazon.de/gp/product/B07C8CM5TG/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1). The ESP is drawing about 150mA from the computer, but the port can provide a lot more. I checked with some LEDs and 400mA is not a problem.
Can anyone help me? I am working on this now for over two days and can't find a Solution. What is the Problem with the ESP not responding correctly to the AT command? The blue light is one, when the code is running.
PS: The attached code contains also code for the alarm clock control and LEDs. I attached it, since it could be part of the problem, but some of it is commented out and most of it is not used.
#include<stdint.h>
#include<stdbool.h>
#include"inc/hw_ints.h"
#include"inc/hw_memmap.h"
#include"inc/hw_types.h"
#include"driverlib/gpio.h"
#include"driverlib/sysctl.h"
#include"driverlib/timer.h"
#include"driverlib/interrupt.h"
#include"driverlib/uart.h"
#include"driverlib/pin_map.h"
#include "driverlib/rom.h"
// stores the time since system start in ms
uint32_t systemTime_ms;
//bools or controling the alarm clock and LEDS
bool an_aus = false;
bool alarm_clock = false;
void InterruptHandlerTimer0A (void)
{
// Clear the timer interrupt flag to avoid calling it up again directly
TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
// increase the ms counter by 1 ms
systemTime_ms++;
}
void clockSetup(void)
{
uint32_t timerPeriod;
//configure clock
SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ| SYSCTL_OSC_MAIN);
//activate peripherals for the timer
SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
// configure timers as 32 bit timers in periodic mode
TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
// set the variable timerPeriod to the number of periods to generate a timeout every ms
timerPeriod = (SysCtlClockGet()/1000);
// pass the variable timerPeriod to the TIMER-0-A
TimerLoadSet(TIMER0_BASE, TIMER_A, timerPeriod-1);
// register the InterruptHandlerTimer0A function as an interrupt service routine
TimerIntRegister(TIMER0_BASE, TIMER_A, &(InterruptHandlerTimer0A));
// activate the interrupt on TIMER-0-A
IntEnable(INT_TIMER0A);
// generate an interrupt when TIMER-0-A generates a timeout
TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
// all interrupts are activated
IntMasterEnable();
// start the timer
TimerEnable(TIMER0_BASE, TIMER_A);
}
void UART (void)
{
//configure UART 4:
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART4);
while(!SysCtlPeripheralReady(SYSCTL_PERIPH_UART4));
//GPIO pins for transmitting and receiving
GPIOPinConfigure(GPIO_PC4_U4RX);
GPIOPinConfigure(GPIO_PC5_U4TX);
GPIOPinTypeUART(GPIO_PORTC_BASE, GPIO_PIN_4 | GPIO_PIN_5);
//configure UART 8Bit, no parity, baudrat 38400
UARTConfigSetExpClk(UART4_BASE, SysCtlClockGet(), 38400, (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));
//configure UART 3:
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART3);
while(!SysCtlPeripheralReady(SYSCTL_PERIPH_UART3));
GPIOPinConfigure(GPIO_PC6_U3RX);
GPIOPinConfigure(GPIO_PC7_U3TX);
GPIOPinTypeUART(GPIO_PORTC_BASE, GPIO_PIN_6 | GPIO_PIN_7);
UARTConfigSetExpClk(UART3_BASE, SysCtlClockGet(), 38400, (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));
}
void delay_ms(uint32_t waitTime)
{
// Saves the current system time in ms
uint32_t aktuell = systemTime_ms;
// Wait until the current system time corresponds to the sum of the time at the start of the delay and the waiting time
while(aktuell + waitTime > systemTime_ms);
}
void ex_int_handler(void)
{
// press the button to start timer for alarm clock
alarm_clock = true;
GPIOIntClear(GPIO_PORTF_BASE,GPIO_PIN_4);
}
int main(void)
{
//Peripherals for LED and GPIO
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
//UART
UART();
//Timer
clockSetup();
// button
GPIOPinTypeGPIOInput(GPIO_PORTF_BASE,GPIO_PIN_4);
GPIOPadConfigSet(GPIO_PORTF_BASE,GPIO_PIN_4,GPIO_STRENGTH_2MA,GPIO_PIN_TYPE_STD_WPU);
//OnboardLED
GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE,GPIO_PIN_1);
GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE,GPIO_PIN_3);
//Interrupt Timer
GPIOIntDisable(GPIO_PORTF_BASE,GPIO_PIN_4);
GPIOIntClear(GPIO_PORTF_BASE,GPIO_PIN_4);
GPIOIntTypeSet(GPIO_PORTF_BASE,GPIO_PIN_4,GPIO_FALLING_EDGE);
GPIOIntRegister(GPIO_PORTF_BASE,ex_int_handler);
GPIOIntEnable(GPIO_PORTF_BASE,GPIO_PIN_4);
//Transistor Gate
GPIOPinTypeGPIOOutput(GPIO_PORTB_BASE,GPIO_PIN_0);
//GPIOPadConfigSet(GPIO_PORTB_BASE,GPIO_PIN_0,GPIO_STRENGTH_6MA,GPIO_PIN_TYPE_STD_WPU);
//debugging only: save all the received data from the ESP in an array to look at while debugging
int32_t data[20] = {0};
int32_t j = 0;
//Code for debugging the UART and ESP8266
while(1){
//Checks for Data in the FIFO
while(!UARTCharsAvail(UART4_BASE));
//send AT-command to ESP8266
UARTCharPut(UART4_BASE, 'A');
while(UARTBusy(UART4_BASE));
UARTCharPut(UART4_BASE, 'T');
while(UARTBusy(UART4_BASE));
if(UARTCharsAvail(UART3_BASE))
{
while(UARTCharsAvail(UART3_BASE))
{
//Read data from the FIFO in UART3 -> received from ESP8266
data[j] = UARTCharGet(UART3_BASE);
j++;
}
}
//clear array when its full
if (j >= 20)
{
j = 0;
for(int32_t a = 0; a <21; a++)
{
data[a] = 0;
}
}
}
//code to run the alarm clock and leds
/*
while(1)
{
if (alarm_clock)
{
GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_3,GPIO_PIN_3);
//Wait
delay_ms(30600000);
GPIOPinWrite(GPIO_PORTB_BASE,GPIO_PIN_0,GPIO_PIN_0);
alarm_clock = false;
GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_3,0x00);
//Start Red LED blinking when it is finished
while(1)
{
GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_1,GPIO_PIN_1);
delay_ms(1000);
GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_1,0x00);
delay_ms(1000);
}
}
}
*/
}
