wip

1 files changed, 26 insertions, 4 deletions

diff --git a/cmd/sbc_harness/main.c b/cmd/sbc_harness/main.c
index c6df8f5..8ecc56c 100644
--- a/cmd/sbc_harness/main.c
+++ b/cmd/sbc_harness/main.c
@@ -7,9 +7,11 @@
 #include <string.h> /* for strlen() */
 #include <stdio.h> /* for printf() */
 #include "pico/stdlib.h"
+#include "hardware/flash.h"
 
 #include <libcr/coroutine.h>
 #include <libusb/usb_common.h>
+#include <libmisc/hash.h>
 
 #include "hw/rp2040_hwspi.h"
 #include "hw/w5500.h"
@@ -32,9 +34,23 @@ COROUTINE hello_world_cr(void *_chan) {
 }
 
 int main() {
-	/* initialization */
+	/* 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,
@@ -47,18 +63,24 @@ int main() {
 	w5500_init(&dev_w5500, "W5500", &dev_spi,
 	           21, /* PIN_INTR */
 	           20, /* PIN_RESET */
-	           ((struct net_eth_addr){{0xDE,0xAD,0xBE,0xEF,0x01,0x02}}));
+	           ((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 */
+	/* 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. */
+	/* event loop *********************************************************/
 	coroutine_main();
 }