applications: sdp: mspi: Dummy clocks in rx mode

Iplemented Dummy clocks support for rx mode.

Signed-off-by: Michal Frankiewicz <[email protected]>

Author: mif1-nordic

applications/sdp/mspi/src/hrt/hrt-nrf54l15.s

@@ -487,6 +487,11 @@ hrt_read:
 	li	a2,0
 	addi	a0,s0,20
 	call	hrt_tx_rx.constprop.0
+	lbu	a1,82(s0)
+	lhu	a3,84(s0)
+	li	a2,0
+	addi	a0,s0,40
+	call	hrt_tx_rx.constprop.0
 	li	a5,0
 .L57:
 	lw	a4,64(s0)

applications/sdp/mspi/src/hrt/hrt.c

@@ -12,7 +12,7 @@
 
 #define SPI_INPUT_PIN_NUM 2
 #define CNT1_INIT_VALUE	  1
-#define MSB_MASK (0xff000000)
+#define MSB_MASK	  (0xff000000)
 
 #define INPUT_SHIFT_COUNT (BITS_IN_WORD - BITS_IN_BYTE)
 
@@ -314,6 +314,11 @@ void hrt_read(volatile hrt_xfer_t *hrt_xfer_params)
 	hrt_tx_rx(&hrt_xfer_params->xfer_data[HRT_FE_ADDRESS], hrt_xfer_params->bus_widths.address,
 		  false, hrt_xfer_params->counter_value, CNT1_INIT_VALUE);
 
+	/* Transfer dummy_cycles */
+	hrt_tx_rx(&hrt_xfer_params->xfer_data[HRT_FE_DUMMY_CYCLES],
+		  hrt_xfer_params->bus_widths.dummy_cycles, false, hrt_xfer_params->counter_value,
+		  CNT1_INIT_VALUE);
+
 	for (uint32_t i = 0; i < hrt_xfer_params->xfer_data[HRT_FE_DATA].word_count; i++) {
 		hrt_xfer_params->xfer_data[HRT_FE_DATA].data[i] =
 			nrf_vpr_csr_vio_in_buffered_reversed_byte_get() >> INPUT_SHIFT_COUNT;

applications/sdp/mspi/src/main.c

@@ -28,6 +28,8 @@
 
 #define MAX_SHIFT_COUNT 63
 
+#define DUMMY_CYCLES_DATA 0x00000000
+
 #define CE_PIN_UNUSED UINT8_MAX
 
 #define HRT_IRQ_PRIORITY    2
@@ -260,9 +262,15 @@ static void xfer_execute(nrfe_mspi_xfer_packet_msg_t *xfer_packet)
 
 void prepare_and_read_data(nrfe_mspi_xfer_packet_msg_t *xfer_packet, volatile uint8_t *buffer)
 {
+	/* TODO: rx_dummy*bus_width must be divisible by 8, remove when SHIFTCNTB changing is done.
+	 */
+	NRFX_ASSERT((nrfe_mspi_xfer_config_ptr->rx_dummy * xfer_params.bus_widths.dummy_cycles %
+		     8) == 0);
+
 	volatile nrfe_mspi_dev_config_t *device =
 		&nrfe_mspi_devices[nrfe_mspi_xfer_config_ptr->device_index];
 	nrf_vpr_csr_vio_config_t config;
+	uint32_t dummy_cycles_data = DUMMY_CYCLES_DATA;
 
 	xfer_params.counter_value = 4;
 	xfer_params.ce_vio = ce_vios[device->ce_index];
@@ -298,6 +306,13 @@ void prepare_and_read_data(nrfe_mspi_xfer_packet_msg_t *xfer_packet, volatile ui
 	xfer_params.xfer_data[HRT_FE_ADDRESS].word_count =
 		nrfe_mspi_xfer_config_ptr->address_length;
 
+	/* Configure dummy_cycles phase. */
+	xfer_params.xfer_data[HRT_FE_DUMMY_CYCLES].fun_out = HRT_FUN_OUT_WORD;
+	xfer_params.xfer_data[HRT_FE_DUMMY_CYCLES].data = (uint8_t *)&dummy_cycles_data;
+	xfer_params.xfer_data[HRT_FE_DUMMY_CYCLES].word_count =
+		nrfe_mspi_xfer_config_ptr->rx_dummy * xfer_params.bus_widths.dummy_cycles /
+		BITS_IN_BYTE;
+
 	/* Configure data phase. */
 	xfer_params.xfer_data[HRT_FE_DATA].word_count = xfer_packet->num_bytes;