#include "bsp_key_nonblock.h"

U32 timeout = 0x3FFFFF;

U8 bsp_key_nonblock_init(void)
{
	//初始化为高电平
	KR1 = KR2 = KR3 = KR4 = 1;
	//初始化为高电平
	KC1 = KC2 = KC3 = KC4 = 1;

	return 0;
}

void bsp_key_nonblock_scan_row(U8 r)
{
	KR1 = 1;
	KR2 = 1;
	KR3 = 1;
	KR4 = 1;
	switch(r){
		case 1:
			KR1 = 0;break;
		case 2:
			KR2 = 0;break;
		case 3:
			KR3 = 0;break;
		case 4:
			KR4 = 0;break;
		default:
			break;
	}
}

U8 bsp_key_nonblock_scan_col(U8 c)
{
	if(c == 1)
	{
		return (KC1 == 0);
	}
	else if(c == 2)
	{
		return (KC2 == 0);
	}
	else if(c == 3)
	{
		return (KC3 == 0);
	}
	else if(c == 4)
	{
		return (KC4 == 0);
	}
	return 0;
}

U8 bsp_key_nonblock_scan(U8 *row, U8 *col)
{
	//扫描第1行
	bsp_key_nonblock_scan_row(1);
	*row = 1;
	if(bsp_key_nonblock_scan_col(1) > 0){
		*col = 1;
		return 0;
	}
	if(bsp_key_nonblock_scan_col(2) > 0){
		*col = 2;
		return 1;
	}
	if(bsp_key_nonblock_scan_col(3) > 0){
		*col = 3;
		return 2;
	}
	if(bsp_key_nonblock_scan_col(4) > 0){
		*col = 4;
		return 3;
	}

	//扫描第2行
	bsp_key_nonblock_scan_row(2);
	*row = 2;
	if(bsp_key_nonblock_scan_col(1) > 0){
		*col = 1;
		return 4;
	}
	if(bsp_key_nonblock_scan_col(2) > 0){
		*col = 2;
		return 5;
	}
	if(bsp_key_nonblock_scan_col(3) > 0){
		*col = 3;
		return 6;
	}
	if(bsp_key_nonblock_scan_col(4) > 0){
		*col = 4;
		return 7;
	}

	//扫描第3行
	bsp_key_nonblock_scan_row(3);
	*row = 3;
	if(bsp_key_nonblock_scan_col(1) > 0){
		*col = 1;
		return 8;
	}
	if(bsp_key_nonblock_scan_col(2) > 0){
		*col = 2;
		return 9;
	}
	if(bsp_key_nonblock_scan_col(3) > 0){
		*col = 3;
		return 10;
	}
	if(bsp_key_nonblock_scan_col(4) > 0){
		*col = 4;
		return 11;
	}

	//扫描第4行
	bsp_key_nonblock_scan_row(4);
	*row = 4;
	if(bsp_key_nonblock_scan_col(1) > 0){
		*col = 1;
		return 12;
	}
	if(bsp_key_nonblock_scan_col(2) > 0){
		*col = 2;
		return 13;
	}
	// if(bsp_key_nonblock_scan_col(KC3) > 0){
	// 	return 14;
	// }
	// if(bsp_key_nonblock_scan_col(KC4) > 0){
	// 	return 15;
	// }

	return BSP_KEY_NUM_MAX;
}