hi plz give me help
i want to communicate s32k144evb with uja1169(LPSPI example code), but only received 0xff..
why?? It is example code!!
do i need to connect to external power 12v???
i only connect to usb!!
plz give me help
/*
* main.c (c) NXP 2016
* Description: Simple LPSPI transfer. A frame is transmitted and results read.
* May 31 2016 S. Mihalik - Initial version.
* Sep 23 2016 S. Mihalik - Added SBC commands for SPI transfer
* Oct 31 2016 SM - Clocks adjusted for SPLL at 160 MHz,
* tx, rx variables made global
* Jul 03 2017 SM - removed code for MC33903 on obsolete EVB
*/
#include "S32K144.h" /* include peripheral declarations S32K144 */
#include "LPSPI.h"
#include "clocks_and_modes.h"
#define RAMA_READ2 0XFD00//
uint16_t tx_16bits = RAMA_READ2;//RAMA_READ2; /* SBC UJA1169: read Dev ID Reg @ 0x7E (expect non-zero)*/
/* Note: Obsolete EVB with MC33903 example used 0c2580 */
/* to read SAFE reg flags (expect nonzero result).*/
uint16_t LPSPI1_16bits_read; /* Returned data in to SPI */
void WDOG_disable (void){
WDOG->CNT=0xD928C520; /*Unlock watchdog*/
WDOG->TOVAL=0x0000FFFF; /*Maximum timeout value*/
WDOG->CS = 0x00002100; /*Disable watchdog*/
}
void PORT_init (void) {
PCC->PCCn[PCC_PORTB_INDEX ]|=PCC_PCCn_CGC_MASK; /* Enable clock for PORTB */
PORTB->PCR[14]|=PORT_PCR_MUX(3); /* Port B14: MUX = ALT3, LPSPI1_SCK */
PORTB->PCR[15]|=PORT_PCR_MUX(3); /* Port B15: MUX = ALT3, LPSPI1_SIN */
PORTB->PCR[16]|=PORT_PCR_MUX(3); /* Port B16: MUX = ALT3, LPSPI1_SOUT */
PORTB->PCR[17]|=PORT_PCR_MUX(3); /* Port B17: MUX = ALT3, LPSPI1_PCS3 */
}
int main(void) {
uint32_t counter = 0;
WDOG_disable();
SOSC_init_8MHz(); /* Initialize system oscillator for 8 MHz xtal */
SPLL_init_160MHz(); /* Initialize SPLL to 160 MHz with 8 MHz SOSC */
NormalRUNmode_80MHz(); /* Init clocks: 80 MHz sysclk & core, 40 MHz bus, 20 MHz flash */
LPSPI1_init_master(); /* Initialize LPSPI 1 as master */
PORT_init(); /* Configure ports */
for(;;) {
LPSPI1_transmit_16bits(tx_16bits); /* Transmit half word (16 bits) on LPSPI1 */
LPSPI1_16bits_read = LPSPI1_receive_16bits(); /* Receive half word on LSPI1 */
counter++;
}
}
