SPI slave code in interrupt handler for S9S12GA240 controller

punithb — Tue, 27 Oct 2015 11:56:13 GMT

Hi All,

I am facing one more issue in gpio interrupt.

I am sending SPI data from my KEAZN64 controller(act as MASTER) to S9S12GA240 controller.

i am sending 0x06,0xBC,0xAB data from KEAZN64 to S9S12GA240

(before sending data i am making one gpio(PP0) high to low which is connected between both )

I am receiving data in gpio interrupt handler.

1. but if i received data in main handler there is no loss of data.

1. but if i received data in interrupt handler there is loss of data.

Here will be interrupt and spi init code.

/* Initialise the SPI */

SPI1CR2 = 0x10; //8bit //0x10; /* 8-Bit transfer width; SS pin is used by the SPI */

SPI1BR = 0x28;//0x28; //0x77;//0x77; //0x41; //0x77; /* SPI clock = Bus Clock divided by 2048 = 15.625kHz */

SPI1CR1 = 0x40; //pol,pha =0; slave mode, MSB first //0x56; /* SPI enabled; Master mode; Active high clocks; Slave Select output enabled*/

/* Enable Interrupt on Port P, P7 */

//PERP = 0x03;

//PIEP_PIEP1 = 1;

DDRP_DDRP0=0; // make as input

PERP_PERP0=1; // pull up enable

PPSP_PPSP0=0;

PIEP_PIEP0=1;

EnableInterrupts;

Once i used the fallowing code in main loop , there is no loss of data.

DisplayString("IN intertttput handler ");

LF;

while(rx_data[rx_cnt]!=0xAB)

{

while(SPI1SR_SPIF == 0);

rx_data[rx_cnt] = SPI1DRL;

DisplayByte(rx_data[rx_cnt]);

LF;

//rx_cnt++;

//while(SPI1SR_SPTEF==0);

//SPI1DRL = 0xBA;

}

rx_data[rx_cnt]=0x00;

DisplayString("End intertttput handler ");

LF;

i am getting all 3 data (0x06,0xBC,0xAB)

but if i used same thing in interrupt handler, i am getting only 0x06,0xAB.

means 0xBC is missing.

Here will be my interrupt handler.

#pragma CODE_SEG NON_BANKED

#pragma TRAP_PROC

void interrupt VectorNumber_Vportp PORTPP_ISR(void)

{

unsigned char rx_data[12]={0},rx_cnt=0;

interrupt_Flag = 1;

DisplayString("IN intertttput handler ");

LF;

while(rx_data[rx_cnt]!=0xAB)

{

while(SPI1SR_SPIF == 0);

rx_data[rx_cnt] = SPI1DRL;

DisplayByte(rx_data[rx_cnt]);

LF;

//rx_cnt++;

//while(SPI1SR_SPTEF==0);

//SPI1DRL = 0xBA;

}

rx_data[rx_cnt]=0x00;

DisplayString("End intertttput handler ");

LF;

PIFP=0x01;

}

#pragma CODE_SEG DEFAULT

Could you please let me know what may the the problem?.

Thanks & Regards,
Punith B

Kinetis MicrocontrollersのトピックSPI slave code in interrupt handler for S9S12GA240 controller

SPI slave code in interrupt handler for S9S12GA240 controller