The SCT cannot get the input event

Tony2k20 — Thu, 12 Nov 2020 03:41:20 GMT

I purchased a development board(845MAX) to evaluate the SCT module
1. Output a 100KHz signal from CLKOUT to P0_21 (which can be measured by the oscilloscope)
2. Route P0_20 as SCT_PIN0 and route to SCT_INMUX 0
3. Short-circuit P0.20 and P0.21
4. Set SCT_OUT0 as the test output 0 (The output waveform can be measured using an oscilloscope by simply matching two values)
5. Set SCT_OUT1 as the test output 1 (set 0 to capture the falling edge of IN0 and set 1 to capture the rising edge of IN0)
(the oscilloscope cannot get any waveform , it is OK after the event was changed to match)
6. SCT_IN0 as a clock doesn't work (either in sampling or asynchronous mode), and SCT doesn't work at all when set( When I use async mode, the debug probe cannot detect the target chip, I erase the flash via ISP and set others clock mode, the IDE can work normally)

I have read the AN11538, INSYNC should be set to 1, so I do.

Plz help me!

Thanks

const sctimer_config_t SCT0_initConfig = {
.enableCounterUnify = true,
.clockMode = kSCTIMER_System_ClockMode,
.clockSelect = kSCTIMER_Clock_On_Rise_Input_0,
.enableBidirection_l = false,
.enableBidirection_h = false,
.prescale_l = 0U,
.prescale_h = 0U,
.outInitState = (uint8_t)(0),
.inputsync = (1 << 0U)|
};
uint32_t SCT0_event[5];

static void SCT0_init(void)
{
SCTIMER_Init(SCT0, &SCT0_initConfig);
/* Initialization of state 0 */
SCTIMER_CreateAndScheduleEvent(SCT0, kSCTIMER_MatchEventOnly, 1, kSCTIMER_Out_0, kSCTIMER_Counter_U, &SCT0_event[0]);
SCTIMER_SetupOutputClearAction(SCT0, kSCTIMER_Out_0, SCT0_event[0]);

SCTIMER_CreateAndScheduleEvent(SCT0, kSCTIMER_MatchEventOnly, 6, kSCTIMER_Out_0, kSCTIMER_Counter_U, &SCT0_event[1]);
SCTIMER_SetupOutputSetAction(SCT0, kSCTIMER_Out_0, SCT0_event[1]);

SCTIMER_CreateAndScheduleEvent(SCT0, kSCTIMER_MatchEventOnly, 16, kSCTIMER_Out_0, kSCTIMER_Counter_U, &SCT0_event[2]);
SCTIMER_SetupCounterLimitAction(SCT0, kSCTIMER_Counter_U, SCT0_event[2]);

SCTIMER_CreateAndScheduleEvent(SCT0, kSCTIMER_InputFallEvent, 0, kSCTIMER_Input_1, kSCTIMER_Counter_U, &SCT0_event[3]);
SCTIMER_SetupOutputClearAction(SCT0, kSCTIMER_Out_1, SCT0_event[3]);

SCTIMER_CreateAndScheduleEvent(SCT0, kSCTIMER_InputRiseEvent, 0, kSCTIMER_Input_1, kSCTIMER_Counter_U, &SCT0_event[4]);
SCTIMER_SetupOutputSetAction(SCT0, kSCTIMER_Out_1, SCT0_event[4]);

SCTIMER_StartTimer(SCT0, kSCTIMER_Counter_U);
}

void BOARD_InitPins(void)
{
/* Enables clock for IOCON.: enable */
CLOCK_EnableClock(kCLOCK_Iocon);
/* Enables clock for switch matrix.: enable */
CLOCK_EnableClock(kCLOCK_Swm);
/* SCT_PIN0. Assign to pin using the switch matrix 0 */
INPUTMUX_AttachSignal(INPUTMUX, 0U, kINPUTMUX_SctPin0ToSct0);

const uint32_t DEBUG_UART_RX = (/* Selects pull-up function */
IOCON_PIO_MODE_PULLUP |
/* Enable hysteresis */
IOCON_PIO_HYS_EN |
/* Input not invert */
IOCON_PIO_INV_DI |
/* Disables Open-drain function */
IOCON_PIO_OD_DI |
/* Bypass input filter */
IOCON_PIO_SMODE_BYPASS |
/* IOCONCLKDIV0 */
IOCON_PIO_CLKDIV0);
/* PIO1 PIN16 (coords: 36) is configured as USART0, RXD. */
IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO1_16, DEBUG_UART_RX);

const uint32_t DEBUG_UART_TX = (/* Selects pull-up function */
IOCON_PIO_MODE_PULLUP |
/* Enable hysteresis */
IOCON_PIO_HYS_EN |
/* Input not invert */
IOCON_PIO_INV_DI |
/* Disables Open-drain function */
IOCON_PIO_OD_DI |
/* Bypass input filter */
IOCON_PIO_SMODE_BYPASS |
/* IOCONCLKDIV0 */
IOCON_PIO_CLKDIV0);
/* PIO1 PIN17 (coords: 37) is configured as USART0, TXD. */
IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO1_17, DEBUG_UART_TX);

/* USART0_TXD connect to P1_17 */
SWM_SetMovablePinSelect(SWM0, kSWM_USART0_TXD, kSWM_PortPin_P1_17);

/* USART0_RXD connect to P1_16 */
SWM_SetMovablePinSelect(SWM0, kSWM_USART0_RXD, kSWM_PortPin_P1_16);

/* CLKOUT connect to P0_21 */
SWM_SetMovablePinSelect(SWM0, kSWM_CLKOUT, kSWM_PortPin_P0_21);

/* SCT_PIN0 connect to P0_20 */
SWM_SetMovablePinSelect(SWM0, kSWM_SCT_PIN0, kSWM_PortPin_P0_20);

/* SCT_OUT0 connect to P1_21 */
SWM_SetMovablePinSelect(SWM0, kSWM_SCT_OUT0, kSWM_PortPin_P1_21);

/* SCT_OUT1 connect to P1_20 */
SWM_SetMovablePinSelect(SWM0, kSWM_SCT_OUT1, kSWM_PortPin_P1_20);

/* Disable clock for switch matrix. */
CLOCK_DisableClock(kCLOCK_Swm);

}

Re: The SCT cannot get the input event

Alice_Yang — Thu, 12 Nov 2020 07:39:53 GMT

Hello

5. Set SCT_OUT1 as the test output 1 (set 0 to capture the falling edge of IN0 and set 1 to capture the rising edge of IN0)(the oscilloscope cannot get any waveform

>>It seems you use config tool to generate code, so how about create a new project, that just test this function, give a signal to IN0 not from SCT, for example just a high to low to high, check whether the SCT_OUT1 can work well.

Regards,

Alice

Re: The SCT cannot get the input event

Tony2k20 — Thu, 12 Nov 2020 08:01:28 GMT

I have set SCT_IN4( SCT_CLK == 200kHz ) as the SCT input, the input event can work normally.

The problem may lie in the input Settings for the SCT.

Could you show me an example of SCT input Settings?

Re: The SCT cannot get the input event

Tony2k20 — Thu, 12 Nov 2020 09:02:35 GMT

The pin configuration is as follows

If there is any problem, could you please point it out

Re: The SCT cannot get the input event

Alice_Yang — Fri, 13 Nov 2020 06:22:32 GMT

Hello,

You can share your project, I help to check my side, thanks!

Regards,

Alice

Re: The SCT cannot get the input event

Tony2k20 — Fri, 13 Nov 2020 06:57:24 GMT

Thank you

I think I've found the problem! It is OK now.

INPUTMUX_Init(INPUTMUX) should be executed before the INPUTMUX setting.

CLOCK_EnableClock(kCLOCK_Sct);
CLOCK_EnableClock(kCLOCK_Dma);

In this function: The inputmux clock of sct is enabled.

The SCT INMUX clock is drived by xxx? CLOCK_SCT or CLOCK_SWM ?

Re: The SCT cannot get the input event

Alice_Yang — Tue, 17 Nov 2020 07:35:12 GMT

Hello ,

I think is CLOCK_SCT, there is no mentioned clearly, while need enable SCT clock then can

control the INPUTMUX register.

Regards,

Alice

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