This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

send integer through Bluetooth from TM4C123 microcontroller

leo_Liu over 2 years ago

i want to send Temperature sensor and Co2 sensor reading form Tm4C123 vis Bluetooth to app on the phone. I have some code here, i can display CO2 and Temperature reading on the LCD screen, but i can not send these through UART. Hoping anyone can give me some points. Thanks

Fullscreen

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
#include <stdio.h>  
#include <stdint.h>
#include "tm4c123gh6pm.h"
#include "ST7735.h"
#include "PLL.h"
#include "SysTick.h"
#include <stdbool.h>
#include "CO2_Sensor.h"
#include "Temp_Header.h"
#include "Bluetooth.h"
void EnableInterrupts(void);
void WaitForInterrupt(void);
extern uint8_t rx_data[8];
extern uint8_t rx_index;
double co2_calculation;
int main(void){
    PLL_Init();                                 //Initilize PLL to 80MHz
    SysTick_Init();                         //Initilize SysTick Timer
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

#include <stdio.h>	
#include <stdint.h>
#include "tm4c123gh6pm.h"
#include "ST7735.h"
#include "PLL.h"
#include "SysTick.h"
#include <stdbool.h>
#include "CO2_Sensor.h"
#include "Temp_Header.h"
#include "Bluetooth.h"

void EnableInterrupts(void);
void WaitForInterrupt(void);
extern uint8_t rx_data[8];
extern uint8_t rx_index;
double co2_calculation;


int main(void){
	PLL_Init();									//Initilize PLL to 80MHz
	SysTick_Init();							//Initilize SysTick Timer
	ST7735_InitR(INITR_REDTAB); //Initilize LCD Screen
	EnableInterrupts();
	CO2_UART_Init (1, 0,' ', 9600); // initialize co2 uart
	tempSensor_Init();
	//Bluetooth_UART_Init(1, 0,' ', 9600);
	
	

	while(1){
		sendBytes();
		WaitForInterrupt();	
		co2_calculation = rx_data[3]*256+rx_data[4];
    
		ST7735_SetCursor(10,6);
		ST7735_DrawString(11, 6, "      ", 0xFFFF);
    ST7735_OutUDec(co2_calculation);
		ST7735_DrawString(11,8,"ppm ", 0xF69F);
			ST7735_SetCursor(11,11);                  // Set location of temp read number in lCD
    ST7735_OutUDec(GetTemp());          // Display results 
//			int8_t temp = GetTemp();
//		 int16_t co2_concentration = co2_calculation;
//		// Split the 16-bit integer into two 8-bit integers
//		int8_t co2_high_byte = (co2_concentration >> 8) & 0xFF;
//		int8_t co2_low_byte = co2_concentration & 0xFF;
//		// Send the data over Bluetooth
//		UART_Tx(temp); // Send the temperature as an 8-bit integer
//		UART_Tx(co2_high_byte); // Send the high byte of the CO2 concentration as an 8-bit integer
//		UART_Tx(co2_low_byte); // Send the low byte of the CO2 concentration as an 8-bit integer
//		
			SysTick_Wait10ms(15);
	
	
	
		
	}
	





}

this is mu Main code

Fullscreen

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
#include <stdio.h>  
#include "tm4c123gh6pm.h"
#include <stdint.h>
#include "SysTick.h"
    double Bluetooth_baudCalc = 0;
    double Bluetooth_fractionBaud = 0;
    int Bluetooth_integerBaud = 0;
    int Bluetooth_calcFractionBaud = 0;
    int Bluetooth_regBits = 0;
    int Bluetooth_Parity = 0;
void Bluetooth_UART_Init(int Bluetooth_bits,int Bluetooth_stopBits, char Bluetooth_parity, double Bluetooth_baudRate){ volatile uint32_t delay;
  SYSCTL_RCGCUART_R = 0x80;                 // UART module 7 enable and activate clock
    SYSCTL_RCGCGPIO_R |= 0x10;              // activate clock for Port E
    UART7_CTL_R = 0;                                    // Disable UART7
    GPIO_PORTE_AFSEL_R = 0x03;        // set alt funct on PE0 and 1
    GPIO_PORTE_PDR_R = 0x10;
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

#include <stdio.h>	
#include "tm4c123gh6pm.h"
#include <stdint.h>
#include "SysTick.h"




	double Bluetooth_baudCalc = 0;
	double Bluetooth_fractionBaud = 0;
	int Bluetooth_integerBaud = 0;
	int Bluetooth_calcFractionBaud = 0;
	int Bluetooth_regBits = 0;
	int Bluetooth_Parity = 0;

void Bluetooth_UART_Init(int Bluetooth_bits,int Bluetooth_stopBits, char Bluetooth_parity, double Bluetooth_baudRate){ volatile uint32_t delay;
  SYSCTL_RCGCUART_R = 0x80; 				// UART module 7 enable and activate clock
	SYSCTL_RCGCGPIO_R |= 0x10;  			// activate clock for Port E
	UART7_CTL_R = 0; 									// Disable UART7
	GPIO_PORTE_AFSEL_R = 0x03;        // set alt funct on PE0 and 1
	GPIO_PORTE_PDR_R = 0x10;
	GPIO_PORTE_PCTL_R = 0x00000011;
	GPIO_PORTE_DIR_R  = 0x02;				// PF0 in, PF1 output
	GPIO_PORTE_DEN_R = 0x03;          // enable digital
  GPIO_PORTE_AMSEL_R = 0x00;        // disable analog on PE
	// initialize s function of stopbits
	Bluetooth_stopBits = Bluetooth_stopBits <<3; //Shift 4 places to be in the bit 3 position.
	//initialize uart interrupt
	UART7_IM_R = 0x10; // Interrupt is sent to controller on receive
	NVIC_EN1_R  = 0x80000000; // Enable interrupt on port E Interrupt 63 UART 7
	NVIC_PRI15_R = 0xE0000000;	// Set priority setting PRI7 
	// Calculate Baud Rate
	Bluetooth_baudCalc = 80000000/(16*Bluetooth_baudRate);
	Bluetooth_integerBaud = Bluetooth_baudCalc;
	Bluetooth_fractionBaud = Bluetooth_baudCalc - Bluetooth_integerBaud;
	Bluetooth_calcFractionBaud =(Bluetooth_fractionBaud * 64 + 0.5);
	// Assign # of bits registrar values to switch case.
	switch(Bluetooth_bits)
	{
		case 1:
		{
			Bluetooth_regBits = 0x60;  //8 bits
			break;
		}
		case 2:
		{
			Bluetooth_regBits = 0x40; // 7bits
			break;
		}
		case 3:
		{
			Bluetooth_regBits = 0x20; // 6 bits
			break;
		}
		default:
		{
			Bluetooth_regBits = 0x00; //5 bits
			break;
		}
	}
	//Setting registar value for parity
	switch(Bluetooth_parity)
	{
		case '0': //Parity even
		{
			Bluetooth_Parity = 0x86;
			break;
		}
		case '1': //Parity odd
		{
			Bluetooth_Parity = 0x82;
			break;
		}
		default: //Parity off
		{
			Bluetooth_Parity = 0x00;
			break;
		}
	}
	// initialize uart
	UART7_CTL_R = 0; 	// Disable UART7
	UART7_IBRD_R = Bluetooth_integerBaud; //Assigning integer part
	UART7_FBRD_R = Bluetooth_calcFractionBaud; //Assigning fractional part
	UART7_LCRH_R  |= Bluetooth_regBits; //Oring the word length for the line control
	UART7_LCRH_R  |= Bluetooth_stopBits; //Oring 2 or 1 stop bits
	UART7_LCRH_R |= Bluetooth_Parity; //Assigning parity to registar
	UART7_IFLS_R = 0x00;  // enable FIFO
	UART7_LCRH_R |= 0x10;  // set fifo level
	UART7_CC_R = 0x00; //Want to use system clock
	UART7_CTL_R |= 0x0301; //Turning uart1 back on, transmit and recevie back on
	
	
	UART7_CC_R = 0x00; // UART runs on system clock
	UART7_CTL_R = 0x0301; 	// Enable UART, send, receive
	
	
}

void UART_Tx(int8_t Data){

   UART7_DR_R = Data;// Send the data through UART transmit pin
	
}

this is my Bluetooth library

Fullscreen

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
#include <stdio.h>
#include <stdint.h>
#include "stdint.h"
#include "PLL.h"
#include "Systick.h"
#include "tm4c123gh6pm.h"
int firstByte;  // Variable for first byte to be assigned.
int secByte;        // Varible for second byte received.
int temp;               // Variable for temp sensor data
void tempSensor_Init(void) {        // Function initializes port E pin 4 and 5 I2C to transmit and recieve from sensor.
    SYSCTL_RCGCGPIO_R |= 0x10;      // Turns on port E clock.
    SYSCTL_RCGCI2C_R |= 0x04;           // turns on PWM system
    GPIO_PORTE_AFSEL_R = 0x30;      // Select alternate function
    GPIO_PORTE_PCTL_R = 0x00330000; // Selects M0PWM6 for PE0
    GPIO_PORTE_ODR_R = 0x20;                // Sets pin 4 and 5 to open drain.
    GPIO_PORTE_DIR_R = 0x20;                // Sets PE0 as an output.
    GPIO_PORTE_AMSEL_R = 0x00;          // Disable analog mode.
    GPIO_PORTE_DEN_R = 0x30;                // Enable digital mode.
    I2C2_MCR_R = 0x10;                          // Enable master.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

#include <stdio.h>
#include <stdint.h>
#include "stdint.h"
#include "PLL.h"
#include "Systick.h"
#include "tm4c123gh6pm.h"

int firstByte;  // Variable for first byte to be assigned.
int secByte;		// Varible for second byte received.
int temp;				// Variable for temp sensor data

void tempSensor_Init(void) {		// Function initializes port E pin 4 and 5 I2C to transmit and recieve from sensor.
	SYSCTL_RCGCGPIO_R |= 0x10;		// Turns on port E clock.
	SYSCTL_RCGCI2C_R |= 0x04;			// turns on PWM system
	GPIO_PORTE_AFSEL_R = 0x30;		// Select alternate function
	GPIO_PORTE_PCTL_R = 0x00330000;	// Selects M0PWM6 for PE0
	GPIO_PORTE_ODR_R = 0x20;				// Sets pin 4 and 5 to open drain.
	GPIO_PORTE_DIR_R = 0x20;				// Sets PE0 as an output.
	GPIO_PORTE_AMSEL_R = 0x00;			// Disable analog mode.
	GPIO_PORTE_DEN_R = 0x30;				// Enable digital mode.
	I2C2_MCR_R = 0x10;							// Enable master.
	I2C2_MTPR_R = 0x27;							// Sets desired clock speed.
	
	do{
	//	do{
			I2C2_MSA_R = 0x90;					// Master transmit slave address 
			I2C2_MDR_R = 0x01;					// Master transmits pointer and memory function
			I2C2_MCS_R = 0x03;					// Start and run
			I2C2_MDR_R = 0x60;					// Check for busy
			I2C2_MCS_R = 0x01;					// Data run
			I2C2_MDR_R = 0x00;					// configure second byte of sensor.
			I2C2_MCS_R = 0x05;					// Data run/stop
		 while (I2C2_MCS_R & (1<<6));	// Wait if busy
	} while (I2C2_MCS_R & (1<<1));		// Check for error and repeat if error found.
}



int GetTemp(void){				// Function enables controller to communicate with sensor and set result to variable.
	do{

	I2C2_MSA_R = 0x90;			// Master transmit slave address and 0 bit set 0 write.
	I2C2_MDR_R = 0x00;			// Pointer/memory location
	I2C2_MCS_R = 0x03;		// Data start and run.

while (I2C2_MCS_R & (1 << 6));	// Check busy and wait if busy.
}
while (I2C2_MCS_R & (1 << 1));	// Check error status, repeat if error.

 
	I2C2_MSA_R = 0x91;						// Receive from slave and 0 bit set to 1.
	I2C2_MCS_R = 0x0B;						// Data start, run, acknowledge
	while (I2C2_MCS_R & (1 << 6));
	
	
	firstByte = I2C2_MDR_R;				// Assign data to FirstByte variable
	I2C2_MCS_R = 0x09;						// Run data and ack
	while (I2C2_MCS_R & (1 << 6)); // Check bus busy, if busy wait.


	secByte = I2C2_MDR_R;					// Assigns data for secByte variable
	

firstByte = (firstByte << 4);		// Shifts firstByte 4 to the left.
secByte = (secByte >> 4);				// Shifts secByte 4 to the right.
temp = (firstByte + secByte);		// Adds data from both bytes and assigns to temp variable.
I2C2_MCS_R = 0x05; 						// Run data, stop.
	

if (temp & (1 << 12)) {				// If signed bit is 1, if 1 convert from 2s complement.
	temp = ~temp + 1;						// Convert to negative temp
	temp = temp * 0.0625;
	temp = temp * -1;
	return temp;
}
// Convert to positive temp.
else {
	temp = temp * 0.0625;			
	return temp;							
}
}

this is my temperature code

Fullscreen

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
#include <stdio.h>  
#include <stdint.h>
#include "tm4c123gh6pm.h"
#include "ST7735.h"
#include "PLL.h"
#include "SysTick.h"
#include <stdbool.h>
volatile uint8_t rx_data[8];
volatile uint8_t rx_index = 0;
double baudCalc = 0;
    double fractionBaud = 0;
    int integerBaud = 0;
    int calcFractionBaud = 0;
    int regBits = 0;
    int Parity = 0;
void CO2_UART_Init(int bits,int stopBits, char parity, double baudRate){ volatile uint32_t delay;
  SYSCTL_RCGCUART_R = 0x02;                 // UART module 1 enable and activate clock
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

#include <stdio.h>	
#include <stdint.h>
#include "tm4c123gh6pm.h"
#include "ST7735.h"
#include "PLL.h"
#include "SysTick.h"
#include <stdbool.h>



volatile uint8_t rx_data[8];
volatile uint8_t rx_index = 0;
double baudCalc = 0;
	double fractionBaud = 0;
	int integerBaud = 0;
	int calcFractionBaud = 0;
	int regBits = 0;
	int Parity = 0;

void CO2_UART_Init(int bits,int stopBits, char parity, double baudRate){ volatile uint32_t delay;
  SYSCTL_RCGCUART_R = 0x02; 				// UART module 1 enable and activate clock
	SYSCTL_RCGCGPIO_R |= 0x00000002;          // 1) activate clock for Port B
	UART1_CTL_R = 0; 									// Disable UART1
	GPIO_PORTB_AFSEL_R = 0x03;        // set alt funct on PB0 and 1
	GPIO_PORTB_PDR_R = 0x10;
	GPIO_PORTB_PCTL_R = 0x00000011;
	GPIO_PORTB_DIR_R  = 0x02;				// PB0 in, PB1 output
	GPIO_PORTB_DEN_R = 0x03;          // enable digital
  GPIO_PORTB_AMSEL_R = 0x00;        // disable analog on PB
	// initialize s function of stopbits
	stopBits = stopBits <<3; //Shift 4 places to be in the bit 3 position.
	//initialize uart interrupt
	UART1_IM_R = 0x10; // Interrupt is sent to controller on receive
	NVIC_EN0_R  = 0x40; // Enable interrupt UART 1
	NVIC_PRI15_R = 0xE0000000;	// Set priority setting PRI7 
	// Calculate Baud Rate
	baudCalc = 80000000/(16*baudRate);
	integerBaud = baudCalc;
	fractionBaud = baudCalc - integerBaud;
	calcFractionBaud =(fractionBaud * 64 + 0.5);
	// Assign # of bits registrar values to switch case.
	switch(bits)
	{
		case 1:
		{
			regBits = 0x60;
			break;
		}
		case 2:
		{
			regBits = 0x40;
			break;
		}
		case 3:
		{
			regBits = 0x20;
			break;
		}
		default:
		{
			regBits = 0x00;
			break;
		}
	}
	//Setting registar value for parity
	switch(parity)
	{
		case '0': //Parity even
		{
			Parity = 0x86;
			break;
		}
		case '1': //Parity odd
		{
			Parity = 0x82;
			break;
		}
		default: //Parity off
		{
			Parity = 0x00;
			break;
		}
	}
	// initialize uart
	UART1_CTL_R = 0; 	// Disable UART1
	UART1_IBRD_R = integerBaud; //Assigning integer part
	UART1_FBRD_R = calcFractionBaud; //Assigning fractional part
	UART1_LCRH_R  |= regBits; //Oring the word length for the line control
	UART1_LCRH_R  |= stopBits; //Oring 2 or 1 stop bits
	UART1_LCRH_R |= Parity; //Assigning parity to registar
	UART1_IFLS_R = 0x40;  // set fifo level
	UART1_LCRH_R |= 0x10;  // enable fifo
	UART1_CC_R = 0x00; //Want to use system clock
	UART1_CTL_R |= 0x0301; //Turning uart1 back on, transmit and recevie back on
	
	
	UART1_CC_R = 0x00; // UART runs on system clock
	UART1_CTL_R = 0x0301; 	// Enable UART, send, receive
	
}



void sendBytes(void) {
    // Write four bytes to UART1 TX FIFO
    UART1_DR_R = 0x10;
	  UART1_DR_R = 0x01;
		UART1_DR_R = 0x03;
	  UART1_DR_R = 0xEC;
}

void UART1_Handler(void) {
    // Read received data from UART1 RX FIFO
    while ((UART1_FR_R & 0x10) == 0) {
        rx_data[rx_index++] = UART1_DR_R;
			UART1_ICR_R = 0x10; // clear interrupt 

			
        }
		return;
			
    }

this is mu CO2 sensor code

Top replies

Zhifei Yang over 2 years ago +1 suggested

For this kind of problems, it is better for you to connect the debugger with JTAG probe to check what is the root cause. For Cortex-M processors, you can use J-Link proble with Keil or similar debuggers...