156 lines
6.0 KiB
C
156 lines
6.0 KiB
C
/*****************************************************************************
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*
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* Copyright(C) 2011, Embedded Artists AB
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* All rights reserved.
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*
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******************************************************************************
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* products. This software is supplied "AS IS" without any warranties.
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* Embedded Artists AB assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. Embedded Artists AB
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* reserves the right to make changes in the software without
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* notification. Embedded Artists AB also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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*****************************************************************************/
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/******************************************************************************
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* Includes
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*****************************************************************************/
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#include "lpc_types.h"
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#include "lpc43xx_gpio.h"
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#include "lpc43xx_scu.h"
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#include "joystick.h"
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/******************************************************************************
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* Defines and typedefs
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*****************************************************************************/
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#define GPIO_PIN_LEFT (1<<9)
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#define GPIO_PIN_RIGHT (1<<12)
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#define GPIO_PIN_UP (1<<10)
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#define GPIO_PIN_DOWN (1<<13)
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#define GPIO_PIN_CENTER (1<<8)
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#define GPIO_PORT 4
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/******************************************************************************
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* External global variables
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*****************************************************************************/
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// TODO move later
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/* Pin mode defines, more in line with the definitions in the LPC1800/4300 user manual */
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/* Defines for SFSPx_y pin configuration registers */
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#define PDN_ENABLE (1 << 3) // Pull-down enable
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#define PDN_DISABLE (0 << 3) // Pull-down disable
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#define PUP_ENABLE (0 << 4) // Pull-up enable
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#define PUP_DISABLE (1 << 4) // Pull-up disable
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#define SLEWRATE_SLOW (0 << 5) // Slew rate for low noise with medium speed
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#define SLEWRATE_FAST (1 << 5) // Slew rate for medium noise with fast speed
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#define INBUF_ENABLE (1 << 6) // Input buffer
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#define INBUF_DISABLE (0 << 6) // Input buffer
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#define FILTER_ENABLE (0 << 7) // Glitch filter (for signals below 30MHz)
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#define FILTER_DISABLE (1 << 7) // No glitch filter (for signals above 30MHz)
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#define DRIVE_8MA (1 << 8) // Drive strength of 8mA
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#define DRIVE_14MA (1 << 9) // Drive strength of 14mA
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#define DRIVE_20MA (3 << 8) // Drive strength of 20mA
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/* Configuration examples for various I/O pins */
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#define EMC_IO (PUP_ENABLE | PDN_ENABLE | SLEWRATE_FAST | INBUF_ENABLE | FILTER_DISABLE)
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#define LCD_PINCONFIG (PUP_DISABLE | PDN_DISABLE | SLEWRATE_FAST | INBUF_ENABLE | FILTER_DISABLE)
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#define CLK_IN (PUP_ENABLE | PDN_ENABLE | SLEWRATE_FAST | INBUF_ENABLE | FILTER_DISABLE)
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#define CLK_OUT (PUP_ENABLE | PDN_ENABLE | SLEWRATE_FAST | INBUF_ENABLE | FILTER_DISABLE)
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#define GPIO_PUP (PUP_ENABLE | PDN_DISABLE | SLEWRATE_SLOW | INBUF_ENABLE | FILTER_ENABLE )
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#define GPIO_PDN (PUP_DISABLE | PDN_ENABLE | SLEWRATE_SLOW | INBUF_ENABLE | FILTER_ENABLE )
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#define GPIO_NOPULL (PUP_DISABLE | PDN_DISABLE | SLEWRATE_SLOW | INBUF_ENABLE | FILTER_ENABLE )
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#define UART_RX_TX (PUP_DISABLE | PDN_ENABLE | SLEWRATE_SLOW | INBUF_ENABLE | FILTER_ENABLE )
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#define SSP_IO (PUP_ENABLE | PDN_ENABLE | SLEWRATE_FAST | INBUF_ENABLE | FILTER_DISABLE)
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/******************************************************************************
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* Local variables
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*****************************************************************************/
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/******************************************************************************
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* Local Functions
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*****************************************************************************/
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/******************************************************************************
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* Public Functions
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*****************************************************************************/
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/******************************************************************************
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*
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* Description:
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* Initialize the Joystick Driver
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*
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*****************************************************************************/
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void joystick_init (void)
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{
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/* set to GPIO function for the 5 pins used with the joystick */
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scu_pinmux( 0xa , 1 , GPIO_NOPULL , FUNC0 );//GPIO4[8]
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scu_pinmux( 0xa , 2 , GPIO_NOPULL , FUNC0 );//GPIO4[9]
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scu_pinmux( 0xa , 3 , GPIO_NOPULL , FUNC0 );//GPIO4[10]
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scu_pinmux( 0x9 , 0 , GPIO_NOPULL , FUNC0 );//GPIO4[12]
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scu_pinmux( 0x9 , 1 , GPIO_NOPULL , FUNC0 );//GPIO4[13]
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/* set the pins as inputs */
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GPIO_SetDir(GPIO_PORT, GPIO_PIN_LEFT, 0);
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GPIO_SetDir(GPIO_PORT, GPIO_PIN_RIGHT, 0);
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GPIO_SetDir(GPIO_PORT, GPIO_PIN_UP, 0);
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GPIO_SetDir(GPIO_PORT, GPIO_PIN_DOWN, 0);
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GPIO_SetDir(GPIO_PORT, GPIO_PIN_CENTER, 0);
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}
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/******************************************************************************
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*
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* Description:
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* Read the joystick status
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*
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* Returns:
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* The joystick status. The returned value is a bit mask. More than one
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* direction may be active at any given time (e.g. UP and RIGHT)
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*
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*****************************************************************************/
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uint8_t joystick_read(void)
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{
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uint8_t status = 0;
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uint32_t pinVal = 0;
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pinVal = GPIO_ReadValue(GPIO_PORT);
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pinVal = pinVal;
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if ((pinVal & GPIO_PIN_DOWN) == 0) {
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status |= JOYSTICK_DOWN;
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}
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if ((pinVal & GPIO_PIN_RIGHT) == 0) {
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status |= JOYSTICK_RIGHT;
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}
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if ((pinVal & GPIO_PIN_UP) == 0) {
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status |= JOYSTICK_UP;
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}
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if ((pinVal & GPIO_PIN_LEFT) == 0) {
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status |= JOYSTICK_LEFT;
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}
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if ((pinVal & GPIO_PIN_CENTER) == 0) {
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status |= JOYSTICK_CENTER;
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}
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return status;
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}
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