AnsweredAssumed Answered

eSCI not working in MPC5777c, need some application note

Question asked by yogesh sharma on Dec 18, 2017
Latest reply on Dec 19, 2017 by yogesh sharma

Hello Friends,

 

i am using MPC5777c with Lauterbach, trace32, EVB board. I am writing bootloader code, in that, i want to update my firmware using eSCI in Internal Flash mode. 

My current problem is eSCI is not working correctly, it is just sending 00 and stops working, while i am sending more bytes.

I had gone through the example is given "Example_MPC5777C-PinToggleStationery_v0_4-GHS714", even i had ported same code to my workspace. few of the main code i used is here below.

 


#define APC 0x2000
#define OBE 0x0200
#define IBE 0x0100
#define ODE 0x0020
#define SRC 0x0004
#define WPE 0x0002
#define WPS 0x0001
#define ALT0 0x0000
#define ALT1 0x0400
#define ALT2 0x0800
#define ALT3 0x0C00

#define ETPUA30_pin 144 // PCR number
#define ETPUA31_pin 145

#define LED1_pin ETPUA30_pin
#define LED2_pin ETPUA31_pin

#define PRC_SEL_CPU0 0x00
#define PRC_SEL_both 0x40
#define PRC_SEL_CPU1 0xC0

#define PRC_PRI(x) ((x)&0x0F)


volatile T_U32 GlobalCounter;
T_U8 T1_running = 0;
T_U16 background_running = 0;

int UART_initialized = 0;

void hw_init(void) {
#if defined(TURN_ON_CPU1)
#if defined(START_FROM_FLASH)
SIU.RSTVEC1.R = (unsigned long) 0xc00400 | 0x00000001;
#else
SIU.RSTVEC1.R = (unsigned long)0x40040000 | 0x00000001;
#endif /* defined(START_FROM_FLASH) */
#endif
}


void Init_eSCI_A (void)
{

SIU.PCR[89].R = 0x400; // Configure pad for primary func: TxDA
SIU.PCR[90].R = 0x400; // Configure pad for primary func: RxDA

/* note: SBR = fsys/(16 * desired baudrate) < 8191 */

eSCI_A.CR2.R = 0x2000; // module is enabled (default setting)

/* per_clk = 96MHz */
eSCI_A.BRR.B.SBR = 313; // 19200 baud, 8 bits, no parity
eSCI_A.CR1.B.TE = 1; // Tx enabled
eSCI_A.CR1.B.RE = 1; // Rx enabled

}

void TransmitData(const char * const pBuf, T_U32 cnt)
{
T_U8 j = 0; /* Dummy variable */
for (j=0; j< cnt; j++)
{ /* Loop for character string */

/* Wait for transmit data reg empty = 1 */
while (eSCI_A.IFSR1.B.TDRE == 0) {}
eSCI_A.IFSR1.R = 0x8000; /* Clear TDRE flag */
eSCI_A.SDR.B.RDTD = *(pBuf+j); /* Transmit 8 bits Data */
}
}

void ReceiveData(char *pBuf)
{
while (eSCI_A.IFSR1.B.RDRF == 0) {} /* Wait for receive data reg full = 1 */
eSCI_A.IFSR1.R = 0x2000; /* Clear RDRF flag */
*pBuf = (char)eSCI_A.SDR.B.RDTD; /* Read byte of Data*/
}

int read (int fno, void *buf, int size)
{
int count;

if (UART_initialized == 0)
{
Init_eSCI_A();
UART_initialized = 1;
}

for (count = 0; count < size; count++)
{
ReceiveData( (char *)buf + count );
}

return size;
}


int write (const void *buf, int size)
{
if (UART_initialized == 0)
{
Init_eSCI_A();
UART_initialized = 1;
}

TransmitData ((const char *)buf,size);
return size;
}

static void SIU_Init(void)
{
SIU.PCR[LED1_pin].R = ALT0 | OBE; // general purpose output
SIU.PCR[LED2_pin].R = ALT0 | OBE; // general purpose output
}

static void PIT0_Init(void)
{
/* 30: MDIS = 0 to enable clock for PITs. */
/* 31: FRZ = 1 for Timers stopped in debug mode */
PIT.MCR.R = 0x00000001;
PIT.TIMER[0].LDVAL.R = 18000000 - 1;

/* clear the TIF flag */
PIT.TIMER[0].TFLG.R = 0x00000001;

/* 30: TIE = 1 for interrupt request enabled */
/* 31: TEN = 1 for timer active */
PIT.TIMER[0].TCTRL.R = 0x00000003;
}

void PIT0_ISR(void)
{
SIU.GPDO[LED1_pin].R ^= 1;

PIT.TIMER[0].TFLG.R = 0x00000001;
}

void printff(char *buf, int size){

write ((const void *)buf,size);


}

static void Terminal_ECHO(void)
{
char ch;

if (eSCI_A.IFSR1.B.RDRF == 0)
return;
else
{
eSCI_A.IFSR1.R = 0x2000; // clear RDRF flag
ch =(unsigned char) eSCI_A.SDR.B.RDTD; // read byte of Data
switch(ch)
{
// enter
case '\n':
case '\r':
printff("\r\n",2);
break;

// other symbols
default:
printff("%c",1);
//fflush(stdout);
}
}
}


static void HW_init(void)
{
/* set round robin for all slaves */
XBAR.PORT[0].CRS.B.ARB = 1;
XBAR.PORT[1].CRS.B.ARB = 1;
XBAR.PORT[2].CRS.B.ARB = 1;
XBAR.PORT[3].CRS.B.ARB = 1;
XBAR.PORT[4].CRS.B.ARB = 1;
XBAR.PORT[6].CRS.B.ARB = 1;
XBAR.PORT[7].CRS.B.ARB = 1;

/* initialize GPIOs */
SIU_Init();
}

void Interrupts_enable_Core0(void)
{
/* lower current INTC priority to start INTC interrupts */
INTC.CPR_PRC[0].B.PRI = 0;

/* enable interrupts */
asm(" wrteei 1");
}

void Interrupts_init(void)
{
/* Initialize INTC for software vector mode */
INTC.MCR.R = 0x00000000;

/* configure IVPR and IVORx offsets, also includes a trap for all core
exceptions, excluding IVOR4 exceptions which have seperate handler */
// e200zX_Interrupt_Setup();

/* Set INTC ISR vector table base address */
// INTC.IACKR_PRC[0].R = (T_U32) &IntcIsrVectorTable[0];
// INTC.IACKR_PRC[1].R = (T_U32) &IntcIsrVectorTable[0];

/* assing required peripheral priorities */
INTC.PSR[301].R = PRC_SEL_CPU0 | PRC_PRI(1); // PIT0
// INTC.PSR[303].R = PRC_SEL_CPU1 | PRC_PRI(2); // PIT2
}

int main(void) {

T_U16 counter = 0;

/* MCAL Initialization */

HW_init();

/* 1 sec periodical interrupt */
PIT0_Init();

Interrupts_init();
Interrupts_enable_Core0();

printff("This is Pi\r\n",12);
------------------------

had i made any mistak? or can i get some application note which will discribe how to use eSCI in MPC5777c.

 

thanks 

yogesh

Outcomes