SPI interrupt and auto SSEL configuration

Am-Dev — Thu, 27 Jul 2023 15:57:51 GMT

Hello everyone,

I need your support with my project using the LPC55S06-EVK.

I'm currently working on SPI communication with the FRDM-STBC-AGM01 sensor and i'm struggling on using it in interrupt mode. I state that I've been able to communicate with the sensor in polling mode and the hardware setup isn't changed since that condition.

The main problem is that i can't get the interrupt to be fired again when i finish to send my data to the SPI, regardless which kind of watermark i choose.

Code below:

#include <stdio.h>

#include "board.h"

#include "peripherals.h"

#include "pin_mux.h"

#include "clock_config.h"

#include "LPC55S06.h"

#include "fsl_debug_console.h"

#define BUFFER_SIZE 32

#define SPI_MASTER_IRQ FLEXCOMM8_IRQn

#define SPI_MASTER SPI8

#define LED_GREEN_PIN BOARD_INITLEDSPINS_LED_GREEN_PIN

#define LED_GREEN_PORT BOARD_INITLEDSPINS_LED_GREEN_PORT

spi_master_config_t masterConfig;

spi_transfer_t xfer;

static volatile bool masterFinished = false;

static volatile bool slaveFinished = false;

volatile bool isTransferCompleted = false;

volatile bool isMasterOnTransmit = false;

volatile bool isMasterOnReceive = false;

volatile bool isFinished = false;

volatile bool machine_state = false;

volatile uint32_t g_systickCounter;

uint8_t sendData[BUFFER_SIZE] = {};

uint8_t receiveBuff[BUFFER_SIZE];

uint8_t receivedValue = 0;

//DELAY FUNCTIONS

void SysTick_Handler(void)

{

if (g_systickCounter != 0U)

{

g_systickCounter--;

}

void SysTick_DelayTicks(uint32_t n)

{

g_systickCounter = n;

while (g_systickCounter != 0U)

{

}

void led_pin_toggle() {

GPIO_PinWrite(GPIO, LED_GREEN_PORT, LED_GREEN_PIN, 1);

SysTick_DelayTicks(100);

GPIO_PinWrite(GPIO, LED_GREEN_PORT, LED_GREEN_PIN, 0);

SysTick_DelayTicks(100);

}

int main(void) {

spi_master_handle_t spiHandle;

BOARD_InitBootPins();

BOARD_InitPins();

BOARD_InitLEDsPins();

BOARD_InitBootClocks();

BOARD_InitBootPeripherals();

GPIO_PinWrite(GPIO, LED_GREEN_PORT, LED_GREEN_PIN, 0);

#ifndef BOARD_INIT_DEBUG_CONSOLE_PERIPHERAL

/* Init FSL debug console. */

BOARD_InitDebugConsole();

#endif

SysTick_Config(SystemCoreClock / 250);

SPI_MasterTransferCreateHandle(FLEXCOMM8_PERIPHERAL, &spiHandle, NULL, NULL);

//configure each 1ms

EnableIRQ(FLEXCOMM8_FLEXCOMM_IRQN);

SPI_EnableInterrupts(FLEXCOMM8_PERIPHERAL, (kSPI_TxLvlIrq));

while (1){

if (machine_state) {

sendData[0] = (uint8_t)(0b00001101);

sendData[1] = (uint8_t)(0b00000000);

sendData[2] = (uint8_t)(0b00000000);

// Prepare to send.

xfer.txData = sendData;

xfer.rxData = receiveBuff;

xfer.dataSize = 3;

xfer.configFlags = kSPI_FrameAssert;

GPIO_PinWrite(GPIO, BOARD_INITPINS_CS_MANUAL_PORT, BOARD_INITPINS_CS_MANUAL_PIN, 0);

SysTick_DelayTicks(1);

for (uint8_t i = 0; i < BUFFER_SIZE; i++) {

SPI_WriteData(SPI_MASTER, (uint16_t)sendData[i], kSPI_FrameAssert);

machine_state = false;

led_pin_toggle();

}

SysTick_DelayTicks(1);

GPIO_PinWrite(GPIO, BOARD_INITPINS_CS_MANUAL_PORT, BOARD_INITPINS_CS_MANUAL_PIN, 1);

//SPI_MasterTransferNonBlocking(FLEXCOMM8_PERIPHERAL, &spiHandle, &xfer);

SPI_EnableInterrupts(FLEXCOMM8_PERIPHERAL, (kSPI_TxLvlIrq));

led_pin_toggle();

}

return 0 ;

}//MAIN

/* FLEXCOMM8_IRQn interrupt handler */

void FLEXCOMM8_FLEXCOMM_IRQHANDLER(void) {

SPI_DisableInterrupts(FLEXCOMM8_PERIPHERAL, (kSPI_RxLvlIrq | kSPI_TxLvlIrq));

uint32_t intStatus;

intStatus = SPI_GetStatusFlags(FLEXCOMM8_PERIPHERAL);

//when ready to send data

machine_state = true;

#if defined __CORTEX_M && (__CORTEX_M == 4U)

__DSB();

#endif

}

When in debug mode, i can see the code jumping from the main to the FLEXCOMM8_FLEXCOMM_IRQHANDLER just after the SPI_EnableInterrupts(FLEXCOMM8...) and than moving again into the if (machine_state) but at the GPIO_PinWrite(GPIO, BOARD_INITPINS_CS_MANUAL_PORT, BOARD_INITPINS_CS_MANUAL_PIN, 0);
it goes and get stuck into the callback function.

There is also a function to clear the interrupt registers?

And the secondary issue that i'm facing is that i can't get the "auto SSL" working even if routed using the configurator. It would be great to have the code managing the CS itself.

Thanks in advance for your support, have a great day.

Re: SPI interrupt and auto SSEL configuration

Alice_Yang — Fri, 28 Jul 2023 10:28:12 GMT

Hello @Am-Dev

1) About SPI interrupt, how about firstly test the spi_interrupt demo under SDK? Whether it can work well on your side.

2)" It would be great to have the code managing the CS itself. "

->>If you want to use code control slave select, You can use a simple GPIO to control.

Alice

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SPI interrupt and auto SSEL configuration

Re: SPI interrupt and auto SSEL configuration