3 files changed, 13 insertions, 5 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_qencoder.c b/nuttx/arch/arm/src/stm32/stm32_qencoder.c
index f9fbdd49d..66d96dfd4 100644
--- a/nuttx/arch/arm/src/stm32/stm32_qencoder.c
+++ b/nuttx/arch/arm/src/stm32/stm32_qencoder.c
@@ -666,7 +666,7 @@ static int stm32_setup(FAR struct qe_lowerhalf_s *lower)
    * configured CLKOUT value (minus one)
    */
 
-  stm32_putreg16(priv, STM32_GTIM_PSC_OFFSET, (uint16_t)priv->psc);
+  stm32_putreg16(priv, STM32_GTIM_PSC_OFFSET, (uint16_t)priv->config->psc);
 
 #if defined(CONFIG_STM32_TIM1_QE) || defined(CONFIG_STM32_TIM8_QE)
   if (priv->config->timid == 1 || priv->config->timid == 8) 
diff --git a/nuttx/configs/stm32f4discovery/README.txt b/nuttx/configs/stm32f4discovery/README.txt
index 5ea25c0c8..70075220a 100755
--- a/nuttx/configs/stm32f4discovery/README.txt
+++ b/nuttx/configs/stm32f4discovery/README.txt
@@ -736,8 +736,10 @@ Where <subdir> is one of the following:
        but this must be manually enabled by selecting:
 
        CONFIG_QENCODER=y         : Enable the generic Quadrature Encoder infrastructure
-       CONFIG_STM32_TIM2=y       : Enable TIM2
-       CONFIG_STM32_TIM2_QE=y    : Use TIM2 as the quadrature encoder
+       CONFIG_STM32_TIM8=y       : Enable TIM8
+       CONFIG_STM32_TIM2=n       : (Or optionally TIM2)
+       CONFIG_STM32_TIM8_QE=y    : Use TIM8 as the quadrature encoder
+       CONFIG_STM32_TIM2_QE=y    : (Or optionally TIM2)
 
        See also apps/examples/README.txt
 
diff --git a/nuttx/configs/stm32f4discovery/nsh/defconfig b/nuttx/configs/stm32f4discovery/nsh/defconfig
index fead7980d..5bc628323 100755
--- a/nuttx/configs/stm32f4discovery/nsh/defconfig
+++ b/nuttx/configs/stm32f4discovery/nsh/defconfig
@@ -327,12 +327,18 @@ CONFIG_STM32_TIM4_CHANNEL=2
 #
 # Quadrature Encoder configuration.
 #
-# Uses TIM2 or TIM8.  TIM2 also needs CONFIG_STM32_TIM2=y; TIM8 needs CONFIG_STM_TIM8 above.
-# 
+# CONFIG_QENCODER - Enables the upper-half quadrature encoder driver
+# CONFIG_STM32_TIMn - Enables TIMn
+# CONFIG_STM32_TIMn_QE - Configures TIMn as a quadrature encoder
+# CONFIG_STM32_TIMn_QECLKOUT - Used to configure the TIMn prescaler value
+#
+# Uses TIM2 or TIM8.  TIM2 also needs CONFIG_STM32_TIM2=y; TIM8 needs CONFIG_STM_TIM8=y above.
 #
 CONFIG_QENCODER=n
 CONFIG_STM32_TIM2_QE=n
+CONFIG_STM32_TIM2_QECLKOUT=28000000
 CONFIG_STM32_TIM8_QE=y
+CONFIG_STM32_TIM8_QECLKOUT=28000000
 
 #
 # General build options