sam4e8e: Move gpio_set_peripheral() definition from gpio.h to internal.h

Use internal.h in a similar way to the internal.h in sam3x8e.  Also,
move the twi pin definitions from internal.h to i2c.c (as they are only
used there).

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/sam4e8e/gpio.c

@@ -4,22 +4,23 @@
 //
 // This file may be distributed under the terms of the GNU GPLv3 license.
 
-#include "gpio.h"
-#include "sam4e.h"
-
 #include "autoconf.h" // CONFIG_CLOCK_FREQ
 #include "board/irq.h" // irq_save
 #include "command.h" // shutdown
+#include "gpio.h" // gpio_out_setup
+#include "internal.h" // gpio_set_peripheral
+#include "sam4e.h" // Pio
 #include "sched.h" // sched_shutdown
 
-#define GPIO(PORT, NUM) (((PORT)-'A') * 32 + (NUM))
-#define GPIO2PORT(PIN) ((PIN) / 32)
-#define GPIO2BIT(PIN) (1<<((PIN) % 32))
-
 static Pio * const digital_regs[] = {
     PIOA, PIOB, PIOC, PIOD, PIOE
 };
 
+
+/****************************************************************
+ * Pin multiplexing
+ ****************************************************************/
+
 void
 gpio_set_peripheral(char bank, const uint32_t bit, char ptype, uint32_t pull_up) {
 
@@ -67,6 +68,11 @@ gpio_set_peripheral(char bank, const uint32_t bit, char ptype, uint32_t pull_up)
     }
 }
 
+
+/****************************************************************
+ * General Purpose Input Output (GPIO) pins
+ ****************************************************************/
+
 struct gpio_out
 gpio_out_setup(uint8_t pin, uint8_t val)
 {

src/sam4e8e/gpio.h

@@ -9,7 +9,6 @@ struct gpio_out {
     uint32_t bit;
 };
 
-void gpio_set_peripheral(char bank, uint32_t bit, char ptype, uint32_t pull_up);
 struct gpio_out gpio_out_setup(uint8_t pin, uint8_t val);
 void gpio_out_reset(struct gpio_out g, uint8_t val);
 void gpio_out_toggle_noirq(struct gpio_out g);

src/sam4e8e/i2c.c

@@ -5,12 +5,30 @@
 //
 // This file may be distributed under the terms of the GNU GPLv3 license.
 
-#include "gpio.h"
-#include "internal.h"
-#include "command.h" // shutdown
-#include "sched.h" // sched_shutdown
 #include "autoconf.h" // CONFIG_CLOCK_FREQ
-#include "board/misc.h" //timer_from_us
+#include "board/misc.h" // timer_from_us
+#include "command.h" // shutdown
+#include "gpio.h" // i2c_setup
+#include "internal.h" // gpio_peripheral
+#include "sam4e.h" // TWI0
+#include "sched.h" // sched_shutdown
+
+// I2C pin definitions
+#define TWI0_SCL_BANK 'A'
+#define TWI0_SCL_PIN PIO_PA4A_TWCK0
+#define TWI0_SCL_PERIPH 'A'
+
+#define TWI0_SDA_BANK 'A'
+#define TWI0_SDA_PIN PIO_PA3A_TWD0
+#define TWI0_SDA_PERIPH 'A'
+
+#define TWI1_SCL_BANK 'B'
+#define TWI1_SCL_PIN PIO_PB5A_TWCK1
+#define TWI1_SCL_PERIPH 'A'
+
+#define TWI1_SDA_BANK 'B'
+#define TWI1_SDA_PIN PIO_PB4A_TWD1
+#define TWI1_SDA_PERIPH 'A'
 
 void
 i2c_init(Twi *p_twi, uint32_t rate)

src/sam4e8e/internal.h

@@ -1,18 +1,13 @@
-#include "sam4e.h"
+#ifndef __SAM4_INTERNAL_H
+#define __SAM4_INTERNAL_H
+// Local definitions for sam4 code
 
-// I2C pin definitions
-#define TWI0_SCL_BANK 'A'
-#define TWI0_SCL_PIN PIO_PA4A_TWCK0
-#define TWI0_SCL_PERIPH 'A'
+#include <stdint.h> // uint32_t
 
-#define TWI0_SDA_BANK 'A'
-#define TWI0_SDA_PIN PIO_PA3A_TWD0
-#define TWI0_SDA_PERIPH 'A'
+#define GPIO(PORT, NUM) (((PORT)-'A') * 32 + (NUM))
+#define GPIO2PORT(PIN) ((PIN) / 32)
+#define GPIO2BIT(PIN) (1<<((PIN) % 32))
 
-#define TWI1_SCL_BANK 'B'
-#define TWI1_SCL_PIN PIO_PB5A_TWCK1
-#define TWI1_SCL_PERIPH 'A'
+void gpio_set_peripheral(char bank, uint32_t bit, char ptype, uint32_t pull_up);
 
-#define TWI1_SDA_BANK 'B'
-#define TWI1_SDA_PIN PIO_PB4A_TWD1
-#define TWI1_SDA_PERIPH 'A'
+#endif // internal.h

src/sam4e8e/serial.c

@@ -4,13 +4,10 @@
 //
 // This file may be distributed under the terms of the GNU GPLv3 license.
 
-// CMSIS
-#include "sam4e.h" // UART
-
-// Klipper
 #include "autoconf.h" // CONFIG_SERIAL_BAUD
-#include "board/gpio.h" // gpio_peripheral
 #include "board/serial_irq.h" // serial_rx_data
+#include "internal.h" // gpio_peripheral
+#include "sam4e.h" // UART0
 #include "sched.h" // DECL_INIT
 
 void

src/sam4e8e/spi.c

@@ -4,14 +4,12 @@
 //
 // This file may be distributed under the terms of the GNU GPLv3 license.
 
-// Klipper
-#include "command.h" // shutdown
-#include "sched.h"
 #include "autoconf.h" // CONFIG_CLOCK_FREQ
-
-// SAM4E port
-#include "sam4e.h"
-#include "gpio.h"
+#include "command.h" // shutdown
+#include "gpio.h" // spi_setup
+#include "internal.h" // gpio_set_peripheral
+#include "sam4e.h" // USART0
+#include "sched.h" // sched_shutdown
 
 #define SSPI_USART0 0
 #define SSPI_USART1 1