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-rw-r--r--libmaple/gpio.c31
-rw-r--r--libmaple/gpio.h61
2 files changed, 55 insertions, 37 deletions
diff --git a/libmaple/gpio.c b/libmaple/gpio.c
index be9db6e..9759df8 100644
--- a/libmaple/gpio.c
+++ b/libmaple/gpio.c
@@ -40,19 +40,28 @@ void gpio_init(void) {
rcc_enable_clk_afio();
}
-void gpio_set_mode(GPIO_Port* port, uint8 gpio_pin, uint8 mode) {
- uint32 tmp;
- uint32 shift = POS(gpio_pin % 8);
- GPIOReg CR;
+void gpio_set_mode(GPIO_Port* port, uint8 gpio_pin, GPIOPinMode mode) {
+ uint32 tmp;
+ uint32 shift = POS(gpio_pin % 8);
+ GPIOReg CR;
+ uint32 pullup = 0;
- ASSERT(port);
- ASSERT(gpio_pin < 16);
+ ASSERT(port);
+ ASSERT(gpio_pin < 16);
- CR = (gpio_pin < 8) ? &(port->CRL) : &(port->CRH);
+ if (mode == GPIO_MODE_INPUT_PU) {
+ pullup = 1;
+ mode = CNF_INPUT_PD;
+ }
- tmp = *CR;
- tmp &= POS_MASK(shift);
- tmp |= mode << shift;
+ CR = (gpio_pin < 8) ? &(port->CRL) : &(port->CRH);
- *CR = tmp;
+ tmp = *CR;
+ tmp &= POS_MASK(shift);
+ tmp |= mode << shift;
+
+ *CR = tmp;
+
+ if (pullup)
+ port->ODR = BIT(gpio_pin);
}
diff --git a/libmaple/gpio.h b/libmaple/gpio.h
index a44047e..74320e6 100644
--- a/libmaple/gpio.h
+++ b/libmaple/gpio.h
@@ -49,28 +49,37 @@
#define GPIOC_BASE (GPIO_Port*)0x40011000
#define GPIOD_BASE (GPIO_Port*)0x40011400
-/* Pin modes are set by [CNFx[1:0] : MODEx[1:0]] */
-#define GPIO_SPEED_50MHZ (0x3) // Max output speed 50 MHz
-#define GPIO_MODE_OUTPUT_PP ((0x00 << 2) | GPIO_SPEED_50MHZ)
-#define GPIO_MODE_OUTPUT_OD ((0x01 << 2) | GPIO_SPEED_50MHZ)
-
-#define GPIO_MODE_AF_OUTPUT_PP ((0x02 << 2) | GPIO_SPEED_50MHZ)
-#define GPIO_MODE_AF_OUTPUT_OD ((0x03 << 2) | GPIO_SPEED_50MHZ)
-
-/* Note: mode bits must be set to zero for input mode */
-#define GPIO_MODE_INPUT_ANALOG (0x00 << 2)
-#define GPIO_MODE_INPUT_FLOATING (0x01 << 2)
-#define GPIO_MODE_INPUT_PD (0x02 << 2)
-#define GPIO_MODE_INPUT_PU (0x02 << 2)
+#define GPIO_SPEED_50MHZ (0x3)
+
+#define MODE_OUTPUT_PP ((0x00 << 2) | GPIO_SPEED_50MHZ)
+#define MODE_OUTPUT_OD ((0x01 << 2) | GPIO_SPEED_50MHZ)
+#define MODE_AF_OUTPUT_PP ((0x02 << 2) | GPIO_SPEED_50MHZ)
+#define MODE_AF_OUTPUT_OD ((0x03 << 2) | GPIO_SPEED_50MHZ)
+
+#define CNF_INPUT_ANALOG (0x00 << 2)
+#define CNF_INPUT_FLOATING (0x01 << 2)
+#define CNF_INPUT_PD (0x02 << 2)
+#define CNF_INPUT_PU (0x02 << 2)
+
+typedef enum GPIOPinMode {
+ GPIO_MODE_OUTPUT_PP = MODE_OUTPUT_PP,
+ GPIO_MODE_OUTPUT_OD = MODE_OUTPUT_OD,
+ GPIO_MODE_AF_OUTPUT_PP = MODE_AF_OUTPUT_PP,
+ GPIO_MODE_AF_OUTPUT_OD = MODE_AF_OUTPUT_OD,
+ GPIO_MODE_INPUT_ANALOG = CNF_INPUT_ANALOG,
+ GPIO_MODE_INPUT_FLOATING = CNF_INPUT_FLOATING,
+ GPIO_MODE_INPUT_PD = CNF_INPUT_PD,
+ GPIO_MODE_INPUT_PU,
+} GPIOPinMode;
typedef struct {
- volatile uint32 CRL; // Port configuration register low
- volatile uint32 CRH; // Port configuration register high
- volatile uint32 IDR; // Port input data register
- volatile uint32 ODR; // Port output data register
- volatile uint32 BSRR; // Port bit set/reset register
- volatile uint32 BRR; // Port bit reset register
- volatile uint32 LCKR; // Port configuration lock register
+ volatile uint32 CRL; // Port configuration register low
+ volatile uint32 CRH; // Port configuration register high
+ volatile uint32 IDR; // Port input data register
+ volatile uint32 ODR; // Port output data register
+ volatile uint32 BSRR; // Port bit set/reset register
+ volatile uint32 BRR; // Port bit reset register
+ volatile uint32 LCKR; // Port configuration lock register
} GPIO_Port;
typedef volatile uint32* GPIOReg;
@@ -83,14 +92,14 @@ extern "C"{
#endif
void gpio_init(void);
-void gpio_set_mode(GPIO_Port* port, uint8 gpio_pin, uint8 mode);
+void gpio_set_mode(GPIO_Port* port, uint8 gpio_pin, GPIOPinMode mode);
static inline void gpio_write_bit(GPIO_Port *port, uint8 gpio_pin, uint8 val) {
- if (val){
- port->BSRR = BIT(gpio_pin);
- } else {
- port->BRR = BIT(gpio_pin);
- }
+ if (val){
+ port->BSRR = BIT(gpio_pin);
+ } else {
+ port->BRR = BIT(gpio_pin);
+ }
}
static inline uint32 gpio_read_bit(GPIO_Port *port, uint8 gpio_pin) {