146 lines
3.4 KiB
C
146 lines
3.4 KiB
C
#include <rtthread.h>
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#include "board.h"
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#define LED_DEVICE_CTRL 0x81 /*LED control command*/
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#define LED_NUM 4
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struct led_ctrl
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{
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uint32_t num;
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LPC_GPIO_TypeDef *port;
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};
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struct lpc_led
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{
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/* inherit from rt_device */
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struct rt_device parent;
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struct led_ctrl ctrl[LED_NUM];
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};
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static struct lpc_led led;
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static rt_err_t rt_led_init(rt_device_t dev)
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{
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/* led0 : P4.27,led1:P4.15 ,led2:P4.16 ,led3:P4.17*/
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/* set P4.14,P4.15,P4.16,P4.17 as GPIO. */
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LPC_IOCON->P4_27 = 0x00;
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LPC_IOCON->P4_15 = 0x00;
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LPC_IOCON->P4_16 = 0x00;
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LPC_IOCON->P4_17 = 0x00;
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/* set P4.27,P4.15,P4.16,P4.17 output. */
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LPC_GPIO4->DIR |= (0x07 << 15) | (0x01 << 27);
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/* turn off all the led */
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LPC_GPIO4->SET = (0x07 << 15) | (0x01 << 27);
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led.ctrl[3].num = 27;
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led.ctrl[3].port = LPC_GPIO4;
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led.ctrl[2].num = 15;
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led.ctrl[2].port = LPC_GPIO4;
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led.ctrl[1].num = 16;
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led.ctrl[1].port = LPC_GPIO4;
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led.ctrl[0].num = 17;
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led.ctrl[0].port = LPC_GPIO4;
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return RT_EOK;
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}
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static rt_err_t rt_led_open(rt_device_t dev, rt_uint16_t oflag)
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{
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return RT_EOK;
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}
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static rt_err_t rt_led_close(rt_device_t dev)
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{
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return RT_EOK;
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}
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static rt_size_t rt_led_read(rt_device_t dev, rt_off_t pos, void *buffer,
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rt_size_t size)
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{
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rt_ubase_t index = 0;
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rt_ubase_t nr = size;
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rt_uint8_t *value = buffer;
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RT_ASSERT(dev == &led.parent);
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RT_ASSERT((pos + size) <= LED_NUM);
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for (index = 0; index < nr; index++)
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{
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if ((led.ctrl[pos + index].port->PIN) & 1 << led.ctrl[pos + index].num)
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{
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*value = 0;
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}
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else
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{
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*value = 1;
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}
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value++;
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}
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return index;
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}
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static rt_size_t rt_led_write(rt_device_t dev, rt_off_t pos,
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const void *buffer, rt_size_t size)
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{
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rt_ubase_t index = 0;
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rt_ubase_t nw = size;
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const rt_uint8_t *value = buffer;
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RT_ASSERT(dev == &led.parent);
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RT_ASSERT((pos + size) <= LED_NUM);
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for (index = 0; index < nw; index++)
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{
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if (*value++)
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{
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led.ctrl[pos + index].port->CLR |= (1 << led.ctrl[pos + index].num);
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}
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else
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{
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led.ctrl[pos + index].port->SET |= (1 << led.ctrl[pos + index].num);
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}
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}
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return index;
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}
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static rt_err_t rt_led_control(rt_device_t dev, int cmd, void *args)
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{
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RT_ASSERT(dev == &led.parent);
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if (cmd == LED_DEVICE_CTRL)
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{
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rt_uint32_t *led_num = args;
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*led_num = LED_NUM;
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}
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return RT_EOK;
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}
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int rt_led_hw_init(void)
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{
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led.parent.type = RT_Device_Class_Char;
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led.parent.rx_indicate = RT_NULL;
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led.parent.tx_complete = RT_NULL;
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led.parent.init = rt_led_init;
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led.parent.open = rt_led_open;
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led.parent.close = rt_led_close;
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led.parent.read = rt_led_read;
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led.parent.write = rt_led_write;
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led.parent.control = rt_led_control;
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led.parent.user_data = RT_NULL;
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/* register a character device */
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rt_device_register(&led.parent, "led", RT_DEVICE_FLAG_RDWR);
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/* init led device */
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rt_led_init(&led.parent);
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return 0;
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}
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INIT_DEVICE_EXPORT(rt_led_hw_init);
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#ifdef RT_USING_FINSH
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#include <finsh.h>
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void led_test(rt_uint32_t led_num, rt_uint32_t value)
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{
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rt_uint8_t led_value = value;
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rt_led_write(&led.parent, led_num, &led_value, 1);
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}
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FINSH_FUNCTION_EXPORT(led_test, e.g: led_test(0, 100).)
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#endif
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