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-rw-r--r--src/stm/ao_arch.h13
-rw-r--r--src/stm/ao_arch_funcs.h84
-rw-r--r--src/stm/ao_usb_stm.c16
3 files changed, 89 insertions, 24 deletions
diff --git a/src/stm/ao_arch.h b/src/stm/ao_arch.h
index 3d09af3c..5f033b66 100644
--- a/src/stm/ao_arch.h
+++ b/src/stm/ao_arch.h
@@ -85,10 +85,6 @@ extern const uint32_t ao_radio_cal;
#define ao_arch_task_members\
uint32_t *sp; /* saved stack pointer */
-#define ao_arch_block_interrupts() asm("cpsid i")
-#define ao_arch_release_interrupts() asm("cpsie i")
-
-
/*
* For now, we're running at a weird frequency
*/
@@ -124,6 +120,15 @@ extern const uint32_t ao_radio_cal;
/* The stm32l implements only 4 bits of the priority fields */
+#if AO_NONMASK_INTERRUPT
+#define AO_STM_NVIC_NONMASK_PRIORITY 0x00
+
+/* Set the basepri register to this value to mask all
+ * non-maskable priorities
+ */
+#define AO_STM_NVIC_BASEPRI_MASK 0x10
+#endif
+
#define AO_STM_NVIC_HIGH_PRIORITY 0x40
#define AO_STM_NVIC_MED_PRIORITY 0x80
#define AO_STM_NVIC_LOW_PRIORITY 0xC0
diff --git a/src/stm/ao_arch_funcs.h b/src/stm/ao_arch_funcs.h
index a9d0fa34..88097406 100644
--- a/src/stm/ao_arch_funcs.h
+++ b/src/stm/ao_arch_funcs.h
@@ -345,17 +345,43 @@ extern struct ao_stm_usart ao_stm_usart3;
typedef uint32_t ao_arch_irq_t;
+static inline void
+ao_arch_block_interrupts(void) {
+#ifdef AO_NONMASK_INTERRUPTS
+ asm("msr basepri,%0" : : "r" (AO_STM_NVIC_BASEPRI_MASK));
+#else
+ asm("cpsid i");
+#endif
+}
+
+static inline void
+ao_arch_release_interrupts(void) {
+#ifdef AO_NONMASK_INTERRUPTS
+ asm("msr basepri,%0" : : "r" (0x0));
+#else
+ asm("cpsie i");
+#endif
+}
+
static inline uint32_t
ao_arch_irqsave(void) {
- uint32_t primask;
- asm("mrs %0,primask" : "=&r" (primask));
+ uint32_t val;
+#ifdef AO_NONMASK_INTERRUPTS
+ asm("mrs %0,basepri" : "=r" (val));
+#else
+ asm("mrs %0,primask" : "=r" (val));
+#endif
ao_arch_block_interrupts();
- return primask;
+ return val;
}
static inline void
-ao_arch_irqrestore(uint32_t primask) {
- asm("msr primask,%0" : : "r" (primask));
+ao_arch_irqrestore(uint32_t basepri) {
+#ifdef AO_NONMASK_INTERRUPTS
+ asm("msr basepri,%0" : : "r" (basepri));
+#else
+ asm("msr primask,%0" : : "r" (basepri));
+#endif
}
static inline void
@@ -365,10 +391,17 @@ ao_arch_memory_barrier() {
static inline void
ao_arch_irq_check(void) {
+#ifdef AO_NONMASK_INTERRUPTS
+ uint32_t basepri;
+ asm("mrs %0,basepri" : "=r" (basepri));
+ if (basepri == 0)
+ ao_panic(AO_PANIC_IRQ);
+#else
uint32_t primask;
- asm("mrs %0,primask" : "=&r" (primask));
+ asm("mrs %0,primask" : "=r" (primask));
if ((primask & 1) == 0)
ao_panic(AO_PANIC_IRQ);
+#endif
}
#if HAS_TASK
@@ -390,7 +423,7 @@ ao_arch_init_stack(struct ao_task *task, void *start)
/* APSR */
ARM_PUSH32(sp, 0);
- /* PRIMASK with interrupts enabled */
+ /* BASEPRI with interrupts enabled */
ARM_PUSH32(sp, 0);
task->sp = sp;
@@ -404,8 +437,13 @@ static inline void ao_arch_save_regs(void) {
asm("mrs r0,apsr");
asm("push {r0}");
+#ifdef AO_NONMASK_INTERRUPTS
+ /* Save BASEPRI */
+ asm("mrs r0,basepri");
+#else
/* Save PRIMASK */
asm("mrs r0,primask");
+#endif
asm("push {r0}");
}
@@ -419,9 +457,15 @@ static inline void ao_arch_restore_stack(void) {
/* Switch stacks */
asm("mov sp, %0" : : "r" (ao_cur_task->sp) );
+#ifdef AO_NONMASK_INTERRUPTS
+ /* Restore BASEPRI */
+ asm("pop {r0}");
+ asm("msr basepri,r0");
+#else
/* Restore PRIMASK */
asm("pop {r0}");
asm("msr primask,r0");
+#endif
/* Restore APSR */
asm("pop {r0}");
@@ -463,7 +507,7 @@ static inline void ao_arch_start_scheduler(void) {
asm("mrs %0,msp" : "=&r" (sp));
asm("msr psp,%0" : : "r" (sp));
- asm("mrs %0,control" : "=&r" (control));
+ asm("mrs %0,control" : "=r" (control));
control |= (1 << 1);
asm("msr control,%0" : : "r" (control));
asm("isb");
@@ -474,12 +518,24 @@ static inline void ao_arch_start_scheduler(void) {
#endif
-#define ao_arch_wait_interrupt() do { \
- asm("\twfi\n"); \
- ao_arch_release_interrupts(); \
- asm(".global ao_idle_loc\nao_idle_loc:"); \
- ao_arch_block_interrupts(); \
- } while (0)
+static inline void
+ao_arch_wait_interrupt(void) {
+#ifdef AO_NONMASK_INTERRUPTS
+ asm(
+ "dsb\n" /* Serialize data */
+ "isb\n" /* Serialize instructions */
+ "cpsid i\n" /* Block all interrupts */
+ "msr basepri,%0\n" /* Allow all interrupts through basepri */
+ "wfi\n" /* Wait for an interrupt */
+ "cpsie i\n" /* Allow all interrupts */
+ "msr basepri,%1\n" /* Block interrupts through basepri */
+ : : "r" (0), "r" (AO_STM_NVIC_BASEPRI_MASK));
+#else
+ asm("\twfi\n");
+ ao_arch_release_interrupts();
+ ao_arch_block_interrupts();
+#endif
+}
#define ao_arch_critical(b) do { \
uint32_t __mask = ao_arch_irqsave(); \
diff --git a/src/stm/ao_usb_stm.c b/src/stm/ao_usb_stm.c
index 2abaf10f..33e0617c 100644
--- a/src/stm/ao_usb_stm.c
+++ b/src/stm/ao_usb_stm.c
@@ -1109,7 +1109,7 @@ struct ao_usb_dbg {
int line;
char *msg;
uint32_t value;
- uint32_t primask;
+ uint32_t prival;
#if TX_DBG
uint16_t in_count;
uint32_t in_epr;
@@ -1125,19 +1125,23 @@ struct ao_usb_dbg {
#endif
};
-#define NUM_USB_DBG 128
+#define NUM_USB_DBG 16
-static struct ao_usb_dbg dbg[128];
+static struct ao_usb_dbg dbg[NUM_USB_DBG];
static int dbg_i;
static void _dbg(int line, char *msg, uint32_t value)
{
- uint32_t primask;
+ uint32_t prival;
dbg[dbg_i].line = line;
dbg[dbg_i].msg = msg;
dbg[dbg_i].value = value;
- asm("mrs %0,primask" : "=&r" (primask));
- dbg[dbg_i].primask = primask;
+#if AO_NONMASK_INTERRUPT
+ asm("mrs %0,basepri" : "=&r" (prival));
+#else
+ asm("mrs %0,primask" : "=&r" (prival));
+#endif
+ dbg[dbg_i].prival = prival;
#if TX_DBG
dbg[dbg_i].in_count = in_count;
dbg[dbg_i].in_epr = stm_usb.epr[AO_USB_IN_EPR];
generated by cgit v1.2.3 (git 2.39.1) at 2025-10-15 23:38:09 +0000