UART transmit problem after Deep Software Standby wakeup

Hello,

I'm using RA6M2 MCU and SCI as UART transceiver. After the power up, everything works fine.

Then the MCU goes to Deep Software Standby mode. After the wakeup, there is no UART data transmitting, but receiving works.

I simplifed the firmware as much as possible, but the problem is still there. Below is the code.

Best regards, Alexey

dtc_instance_ctrl_t g_transfer1_ctrl;

transfer_info_t g_transfer1_info =
{ .dest_addr_mode = TRANSFER_ADDR_MODE_FIXED,
  .repeat_area = TRANSFER_REPEAT_AREA_SOURCE,
  .irq = TRANSFER_IRQ_END,
  .chain_mode = TRANSFER_CHAIN_MODE_DISABLED,
  .src_addr_mode = TRANSFER_ADDR_MODE_INCREMENTED,
  .size = TRANSFER_SIZE_1_BYTE,
  .mode = TRANSFER_MODE_NORMAL,
  .p_dest = (void*) NULL,
  .p_src = (void const*) NULL,
  .num_blocks = 0,
  .length = 0, };
const dtc_extended_cfg_t g_transfer1_cfg_extend =
{ .activation_source = VECTOR_NUMBER_SCI8_TXI, };
const transfer_cfg_t g_transfer1_cfg =
{ .p_info = &g_transfer1_info, .p_extend = &g_transfer1_cfg_extend, };

/* Instance structure to use this module. */
const transfer_instance_t g_transfer1 =
{ .p_ctrl = &g_transfer1_ctrl, .p_cfg = &g_transfer1_cfg, .p_api = &g_transfer_on_dtc };
sci_uart_instance_ctrl_t g_uart_cm_ctrl;

baud_setting_t g_uart_cm_baud_setting =
{
/* Baud rate calculated with 0.160% error. */.abcse = 0,
  .abcs = 0, .bgdm = 1, .cks = 0, .brr = 64, .mddr = (uint8_t) 256, .brme = false };

/** UART extended configuration for UARTonSCI HAL driver */
const sci_uart_extended_cfg_t g_uart_cm_cfg_extend =
{ .clock = SCI_UART_CLOCK_INT, .rx_edge_start = SCI_UART_START_BIT_FALLING_EDGE, .noise_cancel =
          SCI_UART_NOISE_CANCELLATION_DISABLE,
  .rx_fifo_trigger = SCI_UART_RX_FIFO_TRIGGER_MAX, .p_baud_setting = &g_uart_cm_baud_setting, .flow_control =
          SCI_UART_FLOW_CONTROL_RTS,
#if 0xFF != 0xFF
                .flow_control_pin       = BSP_IO_PORT_FF_PIN_0xFF,
                #else
  .flow_control_pin = (bsp_io_port_pin_t) UINT16_MAX,
#endif
        };

/** UART interface configuration */
const uart_cfg_t g_uart_cm_cfg =
{ .channel = 8, .data_bits = UART_DATA_BITS_8, .parity = UART_PARITY_OFF, .stop_bits = UART_STOP_BITS_1, .p_callback =
          user_uart_callback,
  .p_context = NULL, .p_extend = &g_uart_cm_cfg_extend,
#define RA_NOT_DEFINED (1)
#if (RA_NOT_DEFINED == g_transfer1)
                .p_transfer_tx       = NULL,
#else
  .p_transfer_tx = &g_transfer1,
#endif
#if (RA_NOT_DEFINED == RA_NOT_DEFINED)
  .p_transfer_rx = NULL,
#else
                .p_transfer_rx       = &RA_NOT_DEFINED,
#endif
#undef RA_NOT_DEFINED
  .rxi_ipl = (12),
  .txi_ipl = (12), .tei_ipl = (12), .eri_ipl = (12),
#if defined(VECTOR_NUMBER_SCI8_RXI)
                .rxi_irq             = VECTOR_NUMBER_SCI8_RXI,
#else
  .rxi_irq = FSP_INVALID_VECTOR,
#endif
#if defined(VECTOR_NUMBER_SCI8_TXI)
                .txi_irq             = VECTOR_NUMBER_SCI8_TXI,
#else
  .txi_irq = FSP_INVALID_VECTOR,
#endif
#if defined(VECTOR_NUMBER_SCI8_TEI)
                .tei_irq             = VECTOR_NUMBER_SCI8_TEI,
#else
  .tei_irq = FSP_INVALID_VECTOR,
#endif
#if defined(VECTOR_NUMBER_SCI8_ERI)
                .eri_irq             = VECTOR_NUMBER_SCI8_ERI,
#else
  .eri_irq = FSP_INVALID_VECTOR,
#endif
        };

/* Instance structure to use this module. */
const uart_instance_t g_uart_cm =
{ .p_ctrl = &g_uart_cm_ctrl, .p_cfg = &g_uart_cm_cfg, .p_api = &g_uart_on_sci };
dtc_instance_ctrl_t g_transfer0_ctrl;

transfer_info_t g_transfer0_info =
{ .dest_addr_mode = TRANSFER_ADDR_MODE_FIXED,
  .repeat_area = TRANSFER_REPEAT_AREA_SOURCE,
  .irq = TRANSFER_IRQ_END,
  .chain_mode = TRANSFER_CHAIN_MODE_DISABLED,
  .src_addr_mode = TRANSFER_ADDR_MODE_INCREMENTED,
  .size = TRANSFER_SIZE_1_BYTE,
  .mode = TRANSFER_MODE_NORMAL,
  .p_dest = (void*) NULL,
  .p_src = (void const*) NULL,
  .num_blocks = 0,
  .length = 0, };
const dtc_extended_cfg_t g_transfer0_cfg_extend =
{ .activation_source = VECTOR_NUMBER_SCI0_TXI, };
const transfer_cfg_t g_transfer0_cfg =
{ .p_info = &g_transfer0_info, .p_extend = &g_transfer0_cfg_extend, };

/* Instance structure to use this module. */
const transfer_instance_t g_transfer0 =
{ .p_ctrl = &g_transfer0_ctrl, .p_cfg = &g_transfer0_cfg, .p_api = &g_transfer_on_dtc };
sci_uart_instance_ctrl_t g_uart_usb_ctrl;

baud_setting_t g_uart_usb_baud_setting =
{
/* Baud rate calculated with 0.160% error. */.abcse = 0,
  .abcs = 0, .bgdm = 1, .cks = 0, .brr = 64, .mddr = (uint8_t) 256, .brme = false };

/** UART extended configuration for UARTonSCI HAL driver */
const sci_uart_extended_cfg_t g_uart_usb_cfg_extend =
{ .clock = SCI_UART_CLOCK_INT, .rx_edge_start = SCI_UART_START_BIT_FALLING_EDGE, .noise_cancel =
          SCI_UART_NOISE_CANCELLATION_DISABLE,
  .rx_fifo_trigger = SCI_UART_RX_FIFO_TRIGGER_MAX, .p_baud_setting = &g_uart_usb_baud_setting, .flow_control =
          SCI_UART_FLOW_CONTROL_RTS,
#if 0xFF != 0xFF
                .flow_control_pin       = BSP_IO_PORT_FF_PIN_0xFF,
                #else
  .flow_control_pin = (bsp_io_port_pin_t) UINT16_MAX,
#endif
        };

/** UART interface configuration */
const uart_cfg_t g_uart_usb_cfg =
{ .channel = 0, .data_bits = UART_DATA_BITS_8, .parity = UART_PARITY_OFF, .stop_bits = UART_STOP_BITS_1, .p_callback =
          user_uart_callback,
  .p_context = NULL, .p_extend = &g_uart_usb_cfg_extend,
#define RA_NOT_DEFINED (1)
#if (RA_NOT_DEFINED == g_transfer0)
                .p_transfer_tx       = NULL,
#else
  .p_transfer_tx = &g_transfer0,
#endif
#if (RA_NOT_DEFINED == RA_NOT_DEFINED)
  .p_transfer_rx = NULL,
#else
                .p_transfer_rx       = &RA_NOT_DEFINED,
#endif
#undef RA_NOT_DEFINED
  .rxi_ipl = (12),
  .txi_ipl = (12), .tei_ipl = (12), .eri_ipl = (12),
#if defined(VECTOR_NUMBER_SCI0_RXI)
                .rxi_irq             = VECTOR_NUMBER_SCI0_RXI,
#else
  .rxi_irq = FSP_INVALID_VECTOR,
#endif
#if defined(VECTOR_NUMBER_SCI0_TXI)
                .txi_irq             = VECTOR_NUMBER_SCI0_TXI,
#else
  .txi_irq = FSP_INVALID_VECTOR,
#endif
#if defined(VECTOR_NUMBER_SCI0_TEI)
                .tei_irq             = VECTOR_NUMBER_SCI0_TEI,
#else
  .tei_irq = FSP_INVALID_VECTOR,
#endif
#if defined(VECTOR_NUMBER_SCI0_ERI)
                .eri_irq             = VECTOR_NUMBER_SCI0_ERI,
#else
  .eri_irq = FSP_INVALID_VECTOR,
#endif
        };

/* Instance structure to use this module. */
const uart_instance_t g_uart_usb =
{ .p_ctrl = &g_uart_usb_ctrl, .p_cfg = &g_uart_usb_cfg, .p_api = &g_uart_on_sci };
lpm_instance_ctrl_t g_lpm0_ctrl;

const lpm_cfg_t g_lpm0_cfg =
        { .low_power_mode = LPM_MODE_DEEP,
          .snooze_cancel_sources = LPM_SNOOZE_CANCEL_SOURCE_NONE,
          .standby_wake_sources = (lpm_standby_wake_source_t) 0,
          .snooze_request_source = LPM_SNOOZE_REQUEST_RXD0_FALLING,
          .snooze_end_sources = (lpm_snooze_end_t) 0,
          .dtc_state_in_snooze = LPM_SNOOZE_DTC_DISABLE,
#if BSP_FEATURE_LPM_HAS_SBYCR_OPE
    .output_port_enable         = LPM_OUTPUT_PORT_ENABLE_RETAIN,
#endif
#if BSP_FEATURE_LPM_HAS_DEEP_STANDBY
    .io_port_state              = LPM_IO_PORT_NO_CHANGE,
    .power_supply_state         = LPM_POWER_SUPPLY_DEEPCUT0,
    .deep_standby_cancel_source = LPM_DEEP_STANDBY_CANCEL_SOURCE_IRQ6 | LPM_DEEP_STANDBY_CANCEL_SOURCE_IRQ9 | LPM_DEEP_STANDBY_CANCEL_SOURCE_IRQ11 | LPM_DEEP_STANDBY_CANCEL_SOURCE_RTC_ALARM |  (lpm_deep_standby_cancel_source_t) 0,
    .deep_standby_cancel_edge   =  (lpm_deep_standby_cancel_edge_t) 0,
#endif
          .p_extend = NULL, };

const lpm_instance_t g_lpm0 =
{ .p_api = &g_lpm_on_lpm, .p_ctrl = &g_lpm0_ctrl, .p_cfg = &g_lpm0_cfg };




void hal_entry(void)
{
    /* TODO: add your own code here */

    fsp_err_t err;

    static const uint8_t hello[] = "AT+Hello\rOK\r";

    err = R_SCI_UART_Open(&g_uart_usb_ctrl, &g_uart_usb_cfg);
    err = R_SCI_UART_Write(&g_uart_usb_ctrl, hello, sizeof(hello));

    err = R_SCI_UART_Open(&g_uart_cm_ctrl, &g_uart_cm_cfg);
    err = R_SCI_UART_Write(&g_uart_cm_ctrl, hello, sizeof(hello));

    R_BSP_SoftwareDelay(30, BSP_DELAY_UNITS_SECONDS);

    err = R_LPM_Open(&g_lpm0_ctrl, &g_lpm0_cfg);

    R_LPM_LowPowerModeEnter(&g_lpm0_ctrl);

    for (;;)
    {
        R_BSP_SoftwareDelay(1, BSP_DELAY_UNITS_SECONDS);
    }

#if BSP_TZ_SECURE_BUILD
    /* Enter non-secure code */
    R_BSP_NonSecureEnter();
#endif
}

0 AZ_Renesas over 1 year ago

Hi AKarelin,

Thanks for reaching out to Engineering Community.

Before software standby mode is entered, serial transmission must be disabled. The easiest way to do this is to close SCI_UART before entering low power mode and open it again after it has exited.

Alternatively, you can set bit 5 of Serial Control Register(SCR) to 0 before entering low power mode and to 1 again when it has ended.

Please let us know if you solved your issue.

Regards,

AZ_Renesas
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0 AKarelin over 1 year ago in reply to AZ_Renesas

Hi AZ_Renesas,

Unfortunately this didn't work: I tried closing the SCI, adding a delay after sending the data, also I tried abort then close. Nothing worked.
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0 AZ_Renesas over 1 year ago in reply to AKarelin

Hi AKarelin,

I have some notes on your issue:

1) Can you confirm with a breakpoint that R_SCI_UART_Write() is actually executed even with no data transmitted? That will narrow down to a hardware level problem.

2) As it seems an I/O pin state issue to me, could you try clearing IOKEEP bit to allow I/O port use and then setting it to 1 just before you enter Deep Software Standby mode? When deep software standby mode is canceled, an internal reset occurs and this way the I/O ports will keep their state as during the deep software standby mode. You can consult the example in FSP documentation starting at page 2119.

Let us know if you solved the issue.

Regards,

AZ_Renesas
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0 AZ_Renesas over 1 year ago in reply to AKarelin

Hi AKarelin,

Were you able to solve your issue ?

Best regards,

AZ
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