gsm module with CC2640 UART problem

Hello Svend,

yes, UART handle returns NULL. Can you tell me how can i open UART_TX pin separately? So i can perform uart tx and rx operation.

Regards,

Rajneesh

Hi Martin,

I have not worked on sim808. Above code is according to my custom board configuration and just checking code weather gsm modem working or not by sending(AT\r) command. But you have to first read AT commands for sim808 modem and transmit AT commands through UART_write and get response from gsm modem by calling UART_read.

Remember - set correct baud-rate other wise uart read garbage value or null and please verify uart RXD and TXD pins are cross connected with gsm?

Best wish
Rajneesh

Thank You for your valuable replay Mr. Rajneesh 

I have went through all the AT commands of sim808 series ant i have even worked on terminal all of them r working properly and i tried modifying your code but its printing Error.., i have set the baud-rate of 115200 which s standard from both the controller side and SIM808 side ma modified code as fallowed 

UART_Params_init(&params);
params.readMode = UART_MODE_CALLBACK;
params.writeMode = UART_MODE_BLOCKING;
params.readCallback = uartRxCb;
params.readEcho = UART_ECHO_OFF;
params.dataLength = UART_LEN_8;
params.stopBits = UART_STOP_ONE;
params.baudRate = 115200;

hUART = UART_open(CC2650_UART0, &params);

Semaphore_Params sParams;
Semaphore_Params_init(&sParams);
sParams.mode = Semaphore_Mode_BINARY;

Semaphore_construct(&semm, 0, &sParams);
hSem = Semaphore_handle(&semm);

UART_write(hUART, txBuf, sizeof(txBuf));
delay_ms(1000);
UART_read(hUART, &rxBuf, sizeof(rxBuf));
delay_ms(1000);
// Semaphore_pend(hSem, BIOS_WAIT_FOREVER);

if((strstr(rxBuf,"OK")) || (strstr(rxBuf,"ok")))
{
System_printf("AT : OK");
// DEFAULT_SVC_DISCOVERY_DELAY;
LCD_WRITE_STRING("AT : OK", LCD_PAGE2);
}
else
{
System_printf("Error...");
// DEFAULT_SVC_DISCOVERY_DELAY;
LCD_WRITE_STRING("Error...", LCD_PAGE3);
}

this is the code and i have not used 

int main(void) {

PIN_init(BoardGpioInitTable);

Task_Params params;
Task_Params_init(&params);
params.priority = TASK_PRI;
params.stackSize = TASK_STACK_SIZE;
params.stack = taskStack;

Task_construct(&taskStruct, taskFxn, &params, NULL);

BIOS_start();
}

this loop and the power management loop that u have used is it bec of that am not getting the correct response. 

Thank You,

Hi,

Put break point on this line, if((strstr(rxBuf,"OK")) || (strstr(rxBuf,"ok"));

and check rxBuf containts in view > watch1 or you can print by System_printf(rxBuf);

Let me tell what you receive in rxBuf.

And try to set your baudrate 9600.

Regards,

Rajneesh

Hi Rajaneesh 

I tried with both the baud rate(9600/115200) and in rxBuf the value i received is this 

(x)=[0]                        0(Decimal)                                0x2000209A(Address)
(x)=[1]                        0(Decimal)

void SimpleBLECentral_createTask(void)
{
PIN_init(BoardGpioInitTable);
Task_Params taskParams;

// Configure task
Task_Params_init(&taskParams);
taskParams.stack = sbcTaskStack;
taskParams.stackSize = SBC_TASK_STACK_SIZE;
taskParams.priority = SBC_TASK_PRIORITY;

Task_construct(&sbcTask, SimpleBLECentral_taskFxn, &taskParams, NULL);
BIOS_start();
}

This is the task i have created.

Board_EN_VBUS_OFF;
Board_EN_VBUS;
Board_MODEM_PWR_EN_ON;
Board_MODEM_PWR_EN;
ModbusState;
pinHandle;
pEvent;
MODEM_PWR_PGOOD
MODEM_CONTROL
EN_VBUS

 */ Can u tell me what u have defined for all these variables. 

Thank You,

Doc1.docx

Hi,

You have to follow below steps:

1. Enable Vcca pin. 

2. GPIO-TX and GPIO-RX pin map with IOID in Board.h file (refer CC2640 datasheet).

 For e.x. - In my case

#define Board_MODEM_TXD       IOID_15
#define Board_MODEM_RXD       IOID_14

3. Initialize these pin in Board.c file

 For e.x. - In my case

 Board_MODEM_TXD | PIN_GPIO_OUTPUT_EN | PIN_GPIO_HIGH | PIN_PUSHPULL,
 Board_MODEM_RXD | PIN_INPUT_EN,

4. Application code

#include "Board.h"
#include <ti/sysbios/knl/Task.h>
#include <ti/sysbios/BIOS.h>
#include <ti/drivers/PIN.h>
#include <ti/drivers/PIN/PINCC26XX.h>
#include <ti/drivers/UART.h>
#include <xdc/runtime/System.h>
#include "delay.h"

#include "string.h"

static PIN_Handle pinHandle;
static PIN_State ModbusState;

#define TASK_STACK_SIZE 512
#define TASK_PRI 1

char taskStack[TASK_STACK_SIZE];
Task_Struct taskStruct;

void taskFxn(UArg a0, UArg a1);

#define BUFTYPE char
#define PBUFTYPE char*
#define BUFSIZE 15

UART_Handle hUART;

BUFTYPE txBuf[] = "AT\r";
BUFTYPE rxBuf[20];

UART_Params params;

Semaphore_Struct sem;
Semaphore_Handle hSem;

void taskFxn(UArg a0, UArg a1) {

UART_Params_init(&params);
params.readMode = UART_MODE_CALLBACK;
params.writeMode = UART_MODE_BLOCKING;

params.readEcho = UART_ECHO_OFF;
params.dataLength = UART_LEN_8;
params.stopBits = UART_STOP_ONE;
params.baudRate = 115200;

hUART = UART_open(CC2650_UART0, &params);

UART_write(hUART, txBuf, sizeof(txBuf));
delay_ms(1000); 
UART_read(hUART, &rxBuf, sizeof(rxBuf));

if((strstr(rxBuf,"OK")) || (strstr(rxBuf,"ok"))) {
System_printf("AT : OK"); 
}
else {
System_printf("Error...");
} 
}

int main(void) {

PIN_init(BoardGpioInitTable);

Task_Params params;
Task_Params_init(&params);
params.priority = TASK_PRI;
params.stackSize = TASK_STACK_SIZE;
params.stack = taskStack;

Task_construct(&taskStruct, taskFxn, &params, NULL);

BIOS_start();

return 0;
}

5. what is CC2650_UART0 ? in my case:

{ /* CC2650_MODEM */
.baseAddr = UART0_BASE,
.intNum = INT_UART0,
.powerMngrId = PERIPH_UART0,
.txPin = Board_MODEM_TXD,
.rxPin = Board_MODEM_RXD,
.ctsPin = PIN_UNASSIGNED,
.rtsPin = PIN_UNASSIGNED
},

6. After following all steps you have to check gsm modem 49 pin (status pin) If status pin high (Apprx, 3.30 V) means modem supply voltage ok.

Regards,

Rajneesh.

Hi Rajaneesh 

How to enable Vcca since its external supply and 

 Board_EN_VBUS_OFF;
 Board_EN_VBUS;
 Board_MODEM_PWR_EN_ON;
 Board_MODEM_PWR_EN;
 ModbusState;
 pinHandle;
 pEvent;
 MODEM_PWR_PGOOD
 EN_VBUS

What u have defined all these let me know bec i have not used this loop 

pinHandle = PIN_open(&ModbusState, BoardGpioInitTable);
PIN_setOutputValue(pinHandle, PIN_ID(Board_EN_VBUS), Board_EN_VBUS_OFF);

PIN_setOutputValue(pinHandle, PIN_ID(Board_MODEM_PWR_EN), Board_MODEM_PWR_EN_ON); // modem power supply
if(Board_MODEM_PWR_PGOOD)
{
PIN_setOutputValue(pinHandle, PIN_ID(Board_MODEM_CONTROL), 0);

PIN_setOutputValue(pinHandle, PIN_ID(Board_MODEM_CONTROL), 1);

PIN_setOutputValue(pinHandle, PIN_ID(Board_MODEM_CONTROL), 0); // Enable GSM power on

}
else
{
System_printf("Power not Good\n");
PIN_setOutputValue(pinHandle, PIN_ID(Board_MODEM_PWR_EN), Board_MODEM_PWR_EN_ON);

because i could not define all those variables i guess bec am not using this loop am not getting data transferred please let me know what u have defined 

Thank You,

HI,

Please verify Vcca pin directly connected to Vcc Power supply (+3.3V) then no need to enable this pin.

Otherwise you have to enable this pin. You can enable pin by using 

PIN_Handle pinHandle;

PIN_setOutputValue(pinHandle, PIN_Id(pinId), 1);

Where, pinId indicate IOID no. in your case Vcca pin

Best wishes,

Rajneesh

Hi Rajneesh 

I have connected that Vcca to the VDD of the SmartRF06 i can enable that but the thing is i have not declared all these variables so could u pls tell me what u have declared for these variables 

Board_MODEM_CONTROL
Board_MODEM_PWR_EN
Board_MODEM_PWR_EN_ON
Board_EN_VBUS_OFF
Board_MODEM_PWR_PGOOD
Board_EN_VBUS

pinHandle = PIN_open(&ModbusState, BoardGpioInitTable);
PIN_setOutputValue(pinHandle, PIN_ID(Board_EN_VBUS), Board_EN_VBUS_OFF);

PIN_setOutputValue(pinHandle, PIN_ID(Board_MODEM_PWR_EN), Board_MODEM_PWR_EN_ON); // modem power supply
if(Board_MODEM_PWR_PGOOD)
{
PIN_setOutputValue(pinHandle, PIN_ID(Board_MODEM_CONTROL), 0);

PIN_setOutputValue(pinHandle, PIN_ID(Board_MODEM_CONTROL), 1);

PIN_setOutputValue(pinHandle, PIN_ID(Board_MODEM_CONTROL), 0); // Enable GSM power on

}
else
{
System_printf("Power not Good\n");
PIN_setOutputValue(pinHandle, PIN_ID(Board_MODEM_PWR_EN), Board_MODEM_PWR_EN_ON);

I have commented these function since i am not understanding what u have defined 

Hi Rajaneesh, 

I have done the changes in my code as u suggested i have enabled VCCA and now the problem is the code is not running its stopped in main.c it didnt not entered BLEpheripheral.c  application only howw to solve this prob 

Thank You,

Hi Rajaneesh 

I am using SmartRF06 EVB to interface with sim900 EVB board since both r working on the same voltage i doesnt require any voltage matching circuit in between so i am directly connecting UART TX and RX and GND i have uploaded the program that u have written but its not giving any response could u please send me the code (working) if u have worked on it pls '

Thank You

Hi Martin,

Yes, I got. In your Application file include header file.

#include <ti/drivers/PIN.h>
#include <ti/drivers/PIN/PINCC26XX.h>

// Initialise PIN table

static PIN_Config BoardPowerInitTable[] = {
Board_MODEM_PWR_EN | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL,
Board_MODEM_PWR_PGOOD | PIN_INPUT_EN,
Board_MODEM_CONTROL | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL,
Board_EN_VBUS | PIN_GPIO_OUTPUT_EN | PIN_GPIO_HIGH,

PIN_TERMINATE
};

static PIN_Handle pinHandle;
static PIN_State pinState;

// Open pins separately 

 pinHandle = PIN_open(&pinState, BoardPowerInitTable);

Regards,

Rajneesh

Hi Rajneesh 

Thanks for your replay i want to clarify one thing with u. I am using smart RF 06 EVB with sim900EVB board and since its EVB i need not to configure any of this i have asked simcom people they have told to switch on Download button that is sufficient I have attached PIC of the board jus have a look 

Thank You,