#include <stdint.h>
// #include "uart.h"
// #include "gpio.h"
// #include "timer.h"

volatile uint32_t *cdr_tx_status = (uint32_t*)( 0x40000000 + 0x0 ); //read
volatile uint32_t *cdr_tx_txLen  = (uint32_t*)( 0x40000000 + 0x4 ); //write
volatile uint32_t *cdr_tx_txFifo = (uint32_t*)( 0x40000000 + 0x8 ); //write
volatile uint32_t *cdr_TransDir  = (uint32_t*)( 0x40000000 + 0xc ); //write

volatile uint32_t *cdr_rx_softReset = (uint32_t*)( 0x40000000 + 0x10 ); //write
volatile uint32_t *cdr_rx_status    = (uint32_t*)( 0x40000000 + 0x14 ); //read
volatile uint32_t *cdr_rx_rxLen     = (uint32_t*)( 0x40000000 + 0x18 ); //read
volatile uint32_t *cdr_rx_rxFifo    = (uint32_t*)( 0x40000000 + 0x1c ); //read


volatile uint32_t *WriteGpio        = (uint32_t*) ( 0x60000000);
volatile uint32_t *ReadGpio         = (uint32_t*) ( 0x60000000);
volatile uint32_t *ReadIsLast       = (uint32_t*) ( 0x60000008);


static inline void error() {
    while(1);
}




void main()
{
	uint32_t readDat;
	uint32_t operator;
	uint32_t downRecvLen;
	uint32_t upRecvLen;

	uint32_t slvNum;
	uint32_t totNum;

	uint32_t isLast;

	while(1){

		isLast = *ReadIsLast;

		asm volatile (
			"1:\n"
			"andi ra, sp, 0x04\n"
			"beqz ra, 1b\n"
			"andi sp, sp, 0xFB\n"
		);

		readDat = *cdr_0_rx_rxFifo;
		operator = (readDat >> 16) & 0xf;
		downRecvLen = readDat >> 20;

		readDat = *cdr_0_rx_rxFifo;

		if( operator == 0 ){
			slvNum = 64 - ( downRecvLen >> 3 );

			uint32_t localLen = 8;
			uint32_t downSendLen = downRecvLen - 8;

			//接收本地包
			for( uint32_t i = 0; i < 8/4; i++ ){
				asm volatile (
					"andi ra, sp, 0x08\n"
					"1:\n"
					"bnez ra, 1b\n" //error
				);
				readDat = *cdr_0_rx_rxFifo;
			}

			if(!isLast){
				// 下行转发新建包头
				*cdr_0_tx_txLen = downRecvLen; //downSendLen + 8
				*cdr_0_tx_txFifo = (downSendLen << 20) |( 0 << 16) | 0;
				*cdr_0_tx_txFifo = 0;

				//下行转发负载
				asm volatile (
					"lui t0, %hi(0x40000000)\n"
				);		
				for( uint32_t i = 0; i < (downSendLen >> 2); i++ ){ //一次传4byte
					asm volatile (
						// "andi ra, sp, 0x08\n"
						// "1:\n"
						// "bnez ra, 1b\n" //error 速度不够，不再检查接收
						// "lui t0, %hi(0x40000000)\n"
						"lw t1, 0x1c(t0)\n"
						"sw t1, 0x08(t0)\n"

						// : : : "a0", "a1"
					);
					//*cdr_0_tx_txFifo = *cdr_0_rx_rxFifo; //接收即发送			
				}
			} else{ //isLast

				//空转掉剩余负载
				asm volatile (
					"lui t0, %hi(0x40000000)\n"
				);		
				for( uint32_t i = 0; i < (downSendLen >> 2); i++ ){ //一次传4byte
					asm volatile (
						// "andi ra, sp, 0x08\n"
						// "1:\n"
						// "bnez ra, 1b\n" //error 速度不够，不再检查接收
						// "lui t0, %hi(0x40000000)\n"
						"lw t1, 0x1c(t0)\n"
					);		
				}
			}
				//CRC
				asm volatile (
					"andi ra, sp, 0x08\n"
					"1:\n"
					"bnez ra, 1b\n" //error
				);
				uint32_t crc = *cdr_0_rx_rxFifo; //CRC			

			//等待接收完成标志
			asm volatile (
				"1:\n"
				"andi ra, sp, 0x08\n"
				"beqz ra, 1b\n"
				"andi sp, sp, 0xF7\n"
			);


			if(!isLast){
				//上行转发

				//接收第一个包
				asm volatile (
					"1:\n"
					"andi ra, sp, 0x40\n"
					"beqz ra, 1b\n"
					"andi sp, sp, 0xBF\n"
				);

				readDat = *cdr_1_rx_rxFifo;
				operator = (readDat >> 16) & 0xf;
				upRecvLen = readDat >> 20;
				totNum = slvNum + (upRecvLen >> 3) - 1;

				//接收第二个包
				asm volatile (
					"andi ra, sp, 0x80\n"
						"1:\n"
						"bnez ra, 1b\n" //error
				);
				readDat = *cdr_1_rx_rxFifo;	

				//发送上行包头
				*cdr_1_tx_txLen = upRecvLen + 16; //upSendLen + 8
				*cdr_1_tx_txFifo = ((upRecvLen + 8) << 20) |( 0 << 16) | 0;
				*cdr_1_tx_txFifo = 0;

				for( uint8_t i = 0; i < 8/4; i ++ ){
					*cdr_1_tx_txFifo = 0;
				}

				//上行转发负载
				asm volatile (
					"lui t0, %hi(0x40000000)\n"
				);
				for( uint16_t i = 0; i < upRecvLen >> 2; i ++ ){ //一次传4byte
					asm volatile (
						// "andi ra, sp, 0x80\n"
						// "1:\n"
						// "bnez ra, 1b\n" //error 速度不够，不再检查接收
						"lw t1, 0x9c(t0)\n"
						"sw t1, 0x88(t0)\n"
					);

					// *cdr_1_tx_txFifo = *cdr_1_rx_rxFifo; //接收即发送
				}

				//CRC
				asm volatile (
					"andi ra, sp, 0x80\n"
					"1:\n"
					"bnez ra, 1b\n" //error
				);
				crc = *cdr_1_rx_rxFifo; //CRC

				//等待接收完成标志
				asm volatile (
					"1:\n"
					"andi ra, sp, 0x80\n"
					"beqz ra, 1b\n"
					"andi sp, sp, 0x7F\n"
				);


			} else { //islast
				//发送上行包头
				*cdr_1_tx_txLen = 16; //upSendLen + 8
				*cdr_1_tx_txFifo = (8 << 20) |( 0 << 16) | 0;
				*cdr_1_tx_txFifo = 0;

				for( uint8_t i = 0; i < 8/4; i ++ ){
					*cdr_1_tx_txFifo = 0;
				}
			}





		} else if ( operator == 1 ){
			error();
		} else if ( operator == 2 ){
			error();
		} else {
			error();
		}		
	}



}