From b1fe8b25f8ae00398280d8ec1c371254852eaa01 Mon Sep 17 00:00:00 2001
From: Jannis Konrad <kabel42@gmail.com>
Date: Mon, 22 May 2023 11:54:49 +0200
Subject: [PATCH] expand example with all more options
---
examples/struct_gpio/struct_gpio.c | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)
diff --git a/examples/struct_gpio/struct_gpio.c b/examples/struct_gpio/struct_gpio.c
index 3c5643d..5e46581 100644
--- a/examples/struct_gpio/struct_gpio.c
+++ b/examples/struct_gpio/struct_gpio.c
@@ -1,4 +1,4 @@
-/* Small example showing how to use the structs for controling GPIO pins */
+/* Small example showing how to use structs for controling GPIO pins */
#define SYSTEM_CORE_CLOCK 48000000
@@ -32,7 +32,7 @@ int main()
.CNF4 = GPIO_CFGLR_CNF_OUT_PP,
};
- // all unconfigured pins are not 0b0000, aka analog inputs with TTL Schmitttrigger disabled
+ // all unconfigured pins are now 0b0000, aka analog inputs with TTL Schmitttrigger disabled
printf("CFGLR: %lX\n", GPIOD->CFGLR); // -> CFGLR: 10041
// GPIO C0 Push-Pull with 2 volatile writes
@@ -51,8 +51,13 @@ int main()
GPIOD->BSHR_bits = (struct BSHR_t) {
.BS0 = 1,
.BR4 = 1,
- }; // one store
- GPIOC->BSHR_bits.BS0 = 1; // implicit read->modify->write
+ };
+ // GCC sometimes wants to be dumb and turns this into: write zero, read back, or your value, write
+ // this is more consistent
+ GPIOsetReset(GPIOD, GPIO_Pin_1, GPIO_Pin_4);
+
+ // implicit read->modify->write
+ GPIOC->OUTDR_bits.ODR0 = 1;
Delay_Ms( 100 );
// Turn D0 off and D4 on at the same time
@@ -60,8 +65,15 @@ int main()
.BR0 = 1,
.BS4 = 1,
};
- // clear C0 in BCR
- GPIOC->BCR_bits.BR0 = 1;
+
+ // implicit read->modify->write
+ GPIOC->OUTDR_bits.ODR0 = 0;
+ Delay_Ms( 100 );
+
+ // to only set/reset use
+ GPIOset(GPIOD, GPIO_Pin_0);
+ Delay_Ms( 100 );
+ GPIOreset(GPIOD, GPIO_Pin_0);
Delay_Ms( 100 );
}
}
--
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