Trouble in chip select in communication SPI

sanchezbjc_fi-iee

Other Parts Discussed in Thread: TM4C123GH6PZ

Hello,

I'm implementing a SPI communication with the microcontroller TM4C123GH6PZ, but the chip select signalsI am driving through GPIO independently.

So far performed correctly I am sending as shown in the picture

However, to reprogram for sending other bytes, the chip select not operate in the same way and instructions appear to be performed sequentially. That is, it goes high before the bytes are sent as shown in fig.

Does anyone have any idea what happens?

This is the frame of the code

...

GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_7 , 0x00);
SysCtlDelay(10);
SSIDataPut(SSI3_BASE, 'H');
SSIDataPut(SSI3_BASE, 'K');
SSIDataPut(SSI3_BASE, '_');
SSIDataPut(SSI3_BASE, 'P');
SSIDataPut(SSI3_BASE, 'i');
SSIDataPut(SSI3_BASE, 'x');
SSIDataPut(SSI3_BASE, 'q');
SSIDataPut(SSI3_BASE, 'u');
SSIDataPut(SSI3_BASE, 'i');

while(SSIBusy(SSI3_BASE))
{
}
SysCtlDelay(10);
GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_0 | GPIO_PIN_7, 0xFF);

over 10 years ago

0 Amit Ashara over 10 years ago

TI__Guru**** 244400 points

Hello Sanchez,

While the code seems to be functionally correct, there is something that does not seem right.

1. GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_0 | GPIO_PIN_7, 0xFF); is being called but the GPIO_PIN_0 is a locked pin and w/o unlocking it cannot be used as a GPIO
2. Where is GPIO_PIN_0 being made 0?
3. Does the transaction fail, after one attempt, i.e. it works once and then it does not work again?

Regards
Amit

0 sanchezbjc_fi-iee over 10 years ago in reply to Amit Ashara

Intellectual 560 points

Thank Amit,

Answering your questions:

1.- Excuse me, the correct line is GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_7, 0xFF); where GPIO_PIN_7 is a chip select. I'm use GPIO because I have four slaves in the SPI communication and this the way that I implemented.
2.- GPIO_PIN_0 is a chip select for other slave, but I activated with GPIOPinWrite(...) when I need communicate with other slave.
3. The program worked well, sending information performed as shown in the first image. Make a change to the characters sent by the microcontroller and the problem is present and has not returned to work properly.

Regards
Juan Carlos

0 Amit Ashara over 10 years ago in reply to sanchezbjc_fi-iee

TI__Guru**** 244400 points

Hello Juan,

Can you please send me the configuration of the SSI Master Block so that I can check it on a Test Board.

Regards
Amit

0 sanchezbjc_fi-iee over 10 years ago in reply to Amit Ashara

Intellectual 560 points

Hello Amit,

This is the lines of configuration in my code:

int main(void)
{
uint32_t pui32ADC0Value[10];
uint32_t variable[10]={0x0103, 0x0102, 0x0101, 0x0100, 0x0D, 0x0C, 0x03, 0x02, 0x01, 0x00};
float temp_mcu, termistor, MCU, Vo, RT;
uint8_t i;
//==================CONFIGURACIÓN DE RELOJ DE SISTEMA=================================================
SysCtlClockSet(SYSCTL_SYSDIV_5| SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

//==================HABILITACIÓN DE EEPROM===========================================================
SysCtlPeripheralEnable(SYSCTL_PERIPH_EEPROM0);
EEPROMInit();

//==================HABILITACIÓN DE PUERTOS==============================================================
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOH);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOJ);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOK);

//==================CONFIRGUACION COMUNICACIONES SERIALES============================================
//=====================UART's=======================================================================
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0); //GPS
GPIOPinConfigure(GPIO_PA0_U0RX); //GPS RX (26)
GPIOPinConfigure(GPIO_PA1_U0TX); //GPS TX (27)
GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), 115200,
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));

SysCtlPeripheralEnable(SYSCTL_PERIPH_UART1); //CPU
GPIOPinConfigure(GPIO_PC5_U1TX); //CPU TX (24)
GPIOPinConfigure(GPIO_PC4_U1RX); //CPU RX (25)
GPIOPinTypeUART(GPIO_PORTC_BASE, GPIO_PIN_4 | GPIO_PIN_5);

UARTConfigSetExpClk(UART1_BASE, SysCtlClockGet(), 115200,
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));

SysCtlPeripheralEnable(SYSCTL_PERIPH_UART3); //TS
GPIOPinConfigure(GPIO_PC6_U3RX); //TS RX (25)
GPIOPinConfigure(GPIO_PC7_U3TX); //TS TX (26)
GPIOPinTypeUART(GPIO_PORTC_BASE, GPIO_PIN_6 | GPIO_PIN_7);

UARTConfigSetExpClk(UART3_BASE, SysCtlClockGet(), 115200,
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));

//=====================SPI==========================================================================
SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI3);
//GPIOPinConfigure(GPIO_PA3_SSI3FSS);

GPIOPinConfigure(GPIO_PK0_SSI3CLK);
GPIOPinConfigure(GPIO_PK3_SSI3TX);
GPIOPinConfigure(GPIO_PK2_SSI3RX);
GPIOPinTypeSSI(GPIO_PORTK_BASE,GPIO_PIN_0|GPIO_PIN_2|GPIO_PIN_3);
SSIConfigSetExpClk(SSI3_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_0, SSI_MODE_MASTER, 400000, 8);
SSIEnable(SSI3_BASE);

//==CONFIGURACION DE TERMINALES CHIP SELECT==
GPIOPinTypeGPIOOutput(GPIO_PORTG_BASE, GPIO_PIN_2 | GPIO_PIN_3); //PA6---->SPI CS4
GPIOPinWrite(GPIO_PORTG_BASE, GPIO_PIN_2 | GPIO_PIN_3, 0xFF); //PA7---->SPI CS5

GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_7 | GPIO_PIN_0); //PA0---->SPI CS0 PA1---->SPI CS1
GPIOPinWrite(GPIO_PORTK_BASE, GPIO_PIN_7 | GPIO_PIN_0, 0xFF); //PA2---->SPI CS2 PA3---->SPI CS3

//=======================I2C==================================================================
SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C0);
SysCtlPeripheralReset(SYSCTL_PERIPH_I2C0);

GPIOPinConfigure(GPIO_PB2_I2C0SCL);
GPIOPinConfigure(GPIO_PB3_I2C0SDA);

GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_3); //SDA
GPIOPinTypeI2CSCL(GPIO_PORTB_BASE, GPIO_PIN_2); //SCL
I2CMasterInitExpClk(I2C0_BASE, SysCtlClockGet(), false);
HWREG(I2C0_BASE + I2C_O_FIFOCTL) = 80008000;

//==========================CONFIGURACION DE ADC=================================================
SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC1);
// CONFIGURACION DE CANALES DE CONVERSION ANALOGICA DIGITAL======
GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_3); //PE3-> AIN0
GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_2); //PE2-> AIN1
GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_1); //PE1-> AIN2
GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_0); //PE0-> AIN3

GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_7); //PD7-> AIN4
GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_6); //PD6-> AIN5
GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_5); //PD5-> AIN6
GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_4); //PD4-> AIN7

GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_5); //PE5-> AIN8
GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_4); //PE4-> AIN9

GPIOPinTypeADC(GPIO_PORTB_BASE, GPIO_PIN_4); //PB4-> AIN10
GPIOPinTypeADC(GPIO_PORTB_BASE, GPIO_PIN_5); //PB5-> AIN11

GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_3); //PD3-> AIN12
GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_2); //PD2-> AIN13
GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_1); //PD1-> AIN14
GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_0); //PD0-> AIN15

GPIOPinTypeADC(GPIO_PORTH_BASE, GPIO_PIN_0); //PH0-> AIN16
GPIOPinTypeADC(GPIO_PORTH_BASE, GPIO_PIN_1); //PH1-> AIN17
GPIOPinTypeADC(GPIO_PORTH_BASE, GPIO_PIN_2); //PH2-> AIN18
GPIOPinTypeADC(GPIO_PORTH_BASE, GPIO_PIN_3); //PH3-> AIN19

GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_7); //PE7-> AIN20
GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_6); //PE6-> AIN21

//===============================CONFIGURACION DE TERMINALES DE SALIDA=======================
GPIOPinTypeGPIOOutput(GPIO_PORTJ_BASE, GPIO_PIN_2); //EN DIF B
GPIOPinWrite(GPIO_PORTJ_BASE, GPIO_PIN_2, 0x00);

GPIOPinTypeGPIOOutput(GPIO_PORTH_BASE, GPIO_PIN_5 | GPIO_PIN_6); //PJ0--->EN MUX A PJ1--->EN MUX B
GPIOPinWrite(GPIO_PORTH_BASE,GPIO_PIN_5 | GPIO_PIN_6, 0x00); //PJ2---> SELF TEST

GPIOPinTypeGPIOOutput(GPIO_PORTG_BASE, GPIO_PIN_7); //EN DIF A
GPIOPinWrite(GPIO_PORTG_BASE,GPIO_PIN_7, 0x00);

//================================CONFIGURACION DE TERMINALES DE ENTRADA=======================
GPIOPinTypeGPIOInput(GPIO_PORTG_BASE, GPIO_PIN_1); //INT I2C
GPIOPinTypeGPIOInput(GPIO_PORTJ_BASE, GPIO_PIN_1);
GPIOPinTypeGPIOInput(GPIO_PORTB_BASE, GPIO_PIN_0 | GPIO_PIN_1);

//================================CONFIGURACION DE INTERRUPCIONES==========================================
IntEnable(INT_UART3);
UARTIntEnable(UART3_BASE, UART_INT_RX | UART_INT_RT);
IntMasterEnable();
//========================================================

Regards

Juan Carlos

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Trouble in chip select in communication SPI