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stm32: exti: exti_select_source: rework and use EXTI_EXTICR.

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EXTICR on stm32g0 is in exti registers range. Previous chips used to have that
gpio port exti mux configuration accessible via AFIO_EXTICR or SYSCFG_EXTICR.

Also, the new chip now use 8 bits coded value instead of previously 4 for the
extcr mux selection value (see AFIO/SYSCFG/EXTI_EXTICR_FIELDSIZE)

Let's define two helpers:  EXTICR_SELECTION_REG (to get proper AFIO/SYSCFG/
EXTI_EXTICR register) and EXTICR_SELECTION_FIELDSIZE (to get proper AFIO/SYSCFG/
EXTI_EXTICR_FIELDSIZE value), and use it them exti_select_source to determine
exticr mux selection bits shift and mask.
This commit is contained in:
Guillaume Revaillot
2019-01-11 18:34:46 +01:00
committed by Karl Palsson
parent 553c876fa5
commit b98dd8eee0
1 changed files with 15 additions and 11 deletions
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26
lib/stm32/common/exti_common_all.c
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@@ -25,8 +25,17 @@
#include <libopencm3/stm32/exti.h>
#include <libopencm3/stm32/gpio.h>
#if !defined(AFIO_BASE)
# include <libopencm3/stm32/syscfg.h>
#if defined(EXTI_EXTICR)
#define EXTICR_SELECTION_FIELDSIZE EXTI_EXTICR_FIELDSIZE
#define EXTICR_SELECTION_REG(x) EXTI_EXTICR(x)
#elif defined(AFIO_EXTICR)
#define EXTICR_SELECTION_FIELDSIZE AFIO_EXTICR_FIELDSIZE
#define EXTICR_SELECTION_REG(x) AFIO_EXTICR(x)
#else
#include <libopencm3/stm32/syscfg.h>
#define EXTICR_SELECTION_FIELDSIZE SYSCFG_EXTICR_FIELDSIZE
#define EXTICR_SELECTION_REG(x) SYSCFG_EXTICR(x)
#endif
void exti_set_trigger(uint32_t extis, enum exti_trigger_type trig)
@@ -96,7 +105,7 @@ void exti_select_source(uint32_t exti, uint32_t gpioport)
continue;
}
uint32_t bits = 0, mask = 0x0F;
uint32_t bits = 0;
switch (gpioport) {
case GPIOA:
@@ -148,16 +157,11 @@ void exti_select_source(uint32_t exti, uint32_t gpioport)
#endif
}
uint8_t shift = (uint8_t)(4 * (line % 4));
uint8_t shift = (uint8_t)(EXTICR_SELECTION_FIELDSIZE * (line % 4));
uint32_t mask = ((1 << EXTICR_SELECTION_FIELDSIZE) - 1) << shift;
uint32_t reg = line / 4;
bits <<= shift;
mask <<= shift;
#if defined(AFIO_BASE)
AFIO_EXTICR(reg) = (AFIO_EXTICR(reg) & ~mask) | bits;
#else
SYSCFG_EXTICR(reg) = (SYSCFG_EXTICR(reg) & ~mask) | bits;
#endif
EXTICR_SELECTION_REG(reg) = (EXTICR_SELECTION_REG(reg) & ~mask) | (bits << shift);
};
}
/**@}*/