Add option to use BASEPRI instead of PRIMASK to disable interrupts in all ARMv7-M architectures

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5546 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 14 insertions, 0 deletions

diff --git a/nuttx/arch/arm/include/lpc17xx/chip.h b/nuttx/arch/arm/include/lpc17xx/chip.h
index d2c436d35..c22c6aa60 100644
--- a/nuttx/arch/arm/include/lpc17xx/chip.h
+++ b/nuttx/arch/arm/include/lpc17xx/chip.h
@@ -362,6 +362,20 @@
 #  error "Unsupported LPC17xx chip"
 #endif
 
+/* NVIC priority levels *************************************************************/
+/* Each priority field holds a priority value, 0-31. The lower the value, the greater
+ * the priority of the corresponding interrupt. The processor implements only
+ * bits[7:3] of each field, bits[2:0] read as zero and ignore writes.
+ */
+
+#define NVIC_SYSH_PRIORITY_MIN     0xf8 /* All bits[7:3] set is minimum priority */
+#define NVIC_SYSH_PRIORITY_DEFAULT 0x80 /* Midpoint is the default */
+#define NVIC_SYSH_PRIORITY_MAX     0x00 /* Zero is maximum priority */
+#define NVIC_SYSH_PRIORITY_STEP    0x08 /* Five bits of interrupt priority used */
+
+#define NVIC_SYSH_DISABLE_PRIORITY (NVIC_SYSH_PRIORITY_MAX + NVIC_SYSH_PRIORITY_STEP)
+#define NVIC_SYSH_SVCALL_PRIORITY  NVIC_SYSH_PRIORITY_MAX
+
 /************************************************************************************
  * Public Types
  ************************************************************************************/