From fa3d5c345893e19b0c1eaf73ebd8a880b9c847b4 Mon Sep 17 00:00:00 2001
From: Rahix <rahix@rahix.de>
Date: Sat, 8 Jun 2019 18:45:41 +0200
Subject: [PATCH] feat(dual-core): Use {sev,wfe} to synchronize cores
Signed-off-by: Rahix <rahix@rahix.de>
---
hw-tests/dual-core/core1.c | 6 ++++--
hw-tests/dual-core/main.c | 7 +++++++
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/hw-tests/dual-core/core1.c b/hw-tests/dual-core/core1.c
index 605bf0e9a..989c611a0 100644
--- a/hw-tests/dual-core/core1.c
+++ b/hw-tests/dual-core/core1.c
@@ -6,14 +6,16 @@ static const gpio_cfg_t motor_pin = {PORT_0, PIN_8, GPIO_FUNC_OUT, GPIO_PAD_NONE
int main(void)
{
+ // Enable rxev on core1
+ MXC_GCR->evten |= 0x20;
for (int i = 0; 1; i++) {
- printf("Hello from core 1! %d\n", i);
+ __asm volatile("wfe");
+ printf("core1: Hello! %d\n", i);
#if 0
GPIO_OutSet(&motor_pin);
mxc_delay(30000);
GPIO_OutClr(&motor_pin);
#endif
- mxc_delay(970000);
}
}
diff --git a/hw-tests/dual-core/main.c b/hw-tests/dual-core/main.c
index 8a8de068f..d8e94276f 100644
--- a/hw-tests/dual-core/main.c
+++ b/hw-tests/dual-core/main.c
@@ -56,5 +56,12 @@ int main(void)
leds_update();
TMR_Delay(MXC_TMR0, MSEC(10), 0);
h++;
+
+ // Send a txev using `sev` every once in a while to wake up core1
+ // and let it do something
+ if (h % 100 == 0) {
+ printf("core0: Triggering core1 using SEV ...\n");
+ __asm volatile("sev");
+ }
}
}
--
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