/* sbc_harness/main.c - Main entry point and event loop for sbc-harness
 *
 * Copyright (C) 2024  Luke T. Shumaker <lukeshu@lukeshu.com>
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

#include <string.h>         /* libc: for strlen() */
#include <stdio.h>          /* libc: for printf() */

#include <pico/stdlib.h>    /* pico-sdk:pico_stdlib: for stdio_uart_init() */
#include <hardware/flash.h> /* pico-sdk:hardware_flash: for flash_get_unique_id() */

#include <libcr/coroutine.h>
#include <libhw/rp2040_hwspi.h>
#include <libhw/w5500.h>
#include <libmisc/hash.h>
#include <libusb/usb_common.h>

#include "usb_keyboard.h"

COROUTINE hello_world_cr(void *_chan) {
	const char *msg = "Hello world!\n";
	usb_keyboard_rpc_t *chan = _chan;
	cr_begin();

	for (size_t i = 0;; i = (i+1) % strlen(msg)) {
		int result = usb_keyboard_rpc_send_req(chan, (uint32_t)msg[i]);
		if (result < 1) {
			printf("error!\n");
			break;
		}
	}

	cr_end();
}

int main() {
	/* initialization *****************************************************/
	stdio_uart_init();

	/* NOR flash chips have a (bog-?)standard "RUID" "Read Unique
	 * ID" instruction; use our flash chip's unique ID as the
	 * basis for our serial numbers.  */
	uint64_t flash_id64;
	static_assert(sizeof(flash_id64) == FLASH_UNIQUE_ID_SIZE_BYTES);
	flash_get_unique_id((uint8_t *)&flash_id64);
	uint32_t flash_id32 = hash(&flash_id64, sizeof(flash_id64));
	static_assert(sizeof(flash_id32) == sizeof(hash(NULL, 0)));
	uint8_t flash_id24[3] = {
		(uint8_t)((flash_id32 >> 16) & 0xFF),
		(uint8_t)((flash_id32 >>  8) & 0xFF),
		(uint8_t)((flash_id32 >>  0) & 0xFF),
	};

	struct rp2040_hwspi dev_spi;
	struct w5500 dev_w5500;
	rp2040_hwspi_init(&dev_spi, "W5500", RP2040_HWSPI_0,
	                  SPI_MODE_0, /* the W5500 supports mode 0 or mode 3 */
	                  80*1000*1000, /* run at the W5500's max rate of 80MHz */
	                  16,  /* PIN_MISO */
	                  19,  /* PIN_MOSI */
	                  18,  /* PIN_CLK */
	                  17); /* PIN_CS */
	w5500_init(&dev_w5500, "W5500", &dev_spi,
	           21, /* PIN_INTR */
	           20, /* PIN_RESET */
	           ((struct net_eth_addr){{
		           /* vendor ID: "Wiznet" */
		           0x00, 0x08, 0xDC,
		           /* serial number */
		           flash_id24[0], flash_id24[1], flash_id24[2],
	           }}));

	usb_common_earlyinit();
	usb_keyboard_init();
	usb_common_lateinit();

	/* set up coroutines **************************************************/
	coroutine_add(usb_common_cr, NULL);
	usb_keyboard_rpc_t keyboard_chan = {0};
	coroutine_add(usb_keyboard_cr, &keyboard_chan);
	//coroutine_add(hello_world_cr, &keyboard_chan);
	//coroutine_add(dhcp_client_cr, NULL);

	/* event loop *********************************************************/
	coroutine_main();
}