WIP 1wire

bsp/rp2040/board.h

@@ -28,6 +28,8 @@
 #ifndef BOARD_H_MOD
 #define BOARD_H_MOD
 
+#include <pico/bootrom.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -48,6 +50,9 @@ extern "C" {
 #define UART_RX_PIN PICO_DEFAULT_UART_RX_PIN
 #endif
 
+// Reset to bootloader
+#define bsp_reset_bootloader() reset_usb_boot(0, 0)
+
 #ifdef __cplusplus
 }
 #endif

bsp/rp2040/m_default/1wire.c

@@ -0,0 +1,3 @@
+#include <stdio.h>
+
+#include "m_default/1wire.h"

src/m_default/1wire.h

@@ -0,0 +1,54 @@
+#ifndef _1WIRE_H
+#define _1WIRE_H  // we're too cool for #pragma once over here?
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+enum onewire_cmd {
+    // select controller or peripheral, and enable or disable overdrive mode
+    OW_SET_MODE = 0x00,
+
+    // controller
+    OW_WRITE_READ = 0x01,
+    OW_READ_ROM   = 0x02,
+    OW_MATCH_ROM  = 0x03,
+    OW_SEARCH_ROM = 0x04,
+
+    // peripheral
+    OW_SET_EMULATION_TYPE = 0x81,
+    OW_SET_EMULATION_DATA = 0x82,
+    OW_REPORT_TIMING      = 0x83,  // 🕵️📈
+};
+
+enum onewire_mode {
+    OWM_CONTROLLER    = 0x00,
+    OWM_CONTROLLER_OD = 0x10,
+    OWM_PERIPHERAL    = 0x01,
+    OWM_PERIPHERAL_OD = 0x11
+};
+
+enum ow_emulation_type {
+    DS2401 = 0x2401
+    // TODO: more
+};
+
+// low level init (eg, load and configure PIO program on rp2040)
+bool ow_bsp_init();
+// low level deinit (eg, unload PIO program on rp2040)
+bool ow_bsp_deinit();
+
+// write some bytes then read some bytes
+bool ow_write_read(bool od, uint8_t* out, size_t out_len, uint8_t* in, size_t in_len);
+// read rom (eg for 1w serial numbers / eeproms)
+bool ow_read_rom(bool od, uint8_t* in, size_t in_len);
+// TODO: match rom
+// bool ow_match_rom(...);
+// identify all connected devices
+bool ow_search_rom(bool od, uint64_t* discovered_devices, size_t max_devices);
+
+// execute an emulation of a 1w peripheral
+void ow_run_peripheral_emulation(
+        bool od, enum ow_emulation_type typ, uint8_t* data, size_t data_len);
+
+#endif

src/m_sump/_sump.c

@@ -5,6 +5,7 @@
 #include "mode.h"
 #include "thread.h"
 #include "vnd_cfg.h"
+#include "../usbstdio.h"
 
 #include "m_sump/bsp-feature.h"
 

src/vnd_cfg.c

@@ -5,10 +5,10 @@
 #include <string.h>
 #include <tusb.h>
 
+#include "board.h"
 #include "info.h"
 #include "mode.h"
 #include "vnd_cfg.h"
-
 #include "thread.h"
 
 #if CFG_TUD_VENDOR > 0
@@ -175,7 +175,10 @@ void vnd_cfg_task(void) {
             break;
         case cfg_cmd_set_cur_mode:
             verbuf[0] = vnd_cfg_read_byte();
-            if (verbuf[0] == 0 || verbuf[0] >= 0x10 || mode_list[verbuf[0]] == NULL) {
+            if (verbuf[0] == 0) {
+                // reset
+                bsp_reset_bootloader();
+            } else if (verbuf[0] >= 0x10 || mode_list[verbuf[0]] == NULL) {
                 vnd_cfg_write_resp(cfg_resp_nosuchmode, 0, NULL);
             } else {
                 // will be handled later so the USB stack won't break, whcih might happen if reconfig would happen now