[nuttx] branch master updated: arch/nrf52: add an option to configure QSPI sampling delay for RX data

[xiaoxiang]

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xiaoxiang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx.git


The following commit(s) were added to refs/heads/master by this push:
     new 8943d528fd arch/nrf52: add an option to configure QSPI sampling delay 
for RX data
8943d528fd is described below

commit 8943d528fd36f40f17b7a05234ebdfe86aabf760
Author: raiden00pl <raide...@railab.me>
AuthorDate: Thu May 25 12:59:02 2023 +0200

    arch/nrf52: add an option to configure QSPI sampling delay for RX data
    
    The default RX delay value may not be suitable for high QSPI frequencies
---
 arch/arm/src/nrf52/Kconfig      | 15 +++++++++++++++
 arch/arm/src/nrf52/nrf52_qspi.c |  5 +++++
 2 files changed, 20 insertions(+)

diff --git a/arch/arm/src/nrf52/Kconfig b/arch/arm/src/nrf52/Kconfig
index 500e714c20..1fc661c883 100644
--- a/arch/arm/src/nrf52/Kconfig
+++ b/arch/arm/src/nrf52/Kconfig
@@ -661,6 +661,21 @@ config NRF52_I2C_MASTER_COPY_BUF_SIZE
 
 endmenu
 
+menu "QSPI Configuration"
+
+if NRF52_QSPI
+
+config NRF52_QSPI_RXDELAY
+       int "QSPI RX delay"
+       default 2
+       range 0 7
+       ---help---
+               The input serial data sampling delay.
+
+endif # NRF52_QSPI
+
+endmenu # QSPI Configuration
+
 menu "USBDEV Configuration"
 
 endmenu # USBDEV Configuration
diff --git a/arch/arm/src/nrf52/nrf52_qspi.c b/arch/arm/src/nrf52/nrf52_qspi.c
index 4b52e24902..c95df57e26 100644
--- a/arch/arm/src/nrf52/nrf52_qspi.c
+++ b/arch/arm/src/nrf52/nrf52_qspi.c
@@ -835,6 +835,11 @@ static int nrf52_qspi_hw_initialize(struct nrf52_qspidev_s 
*priv)
   regval |= QSPI_IFCONFIG0_PPSIZE_512;
   nrf52_qspi_putreg(priv, NRF52_QSPI_IFCONFIG0_OFFSET, regval);
 
+  /* Configure RX delay */
+
+  nrf52_qspi_putreg(priv, NRF52_QSPI_IFTIMING_OFFSET,
+                    QSPI_IFTIMING_RXDELAY(CONFIG_NRF52_QSPI_RXDELAY));
+
   /* Enable READY interrupt */
 
   nrf52_qspi_putreg(priv, NRF52_QSPI_INTENSET_OFFSET, QSPI_INT_READY);