1 files changed, 65 insertions, 0 deletions
diff --git a/util/switch.c b/util/switch.c
new file mode 100644
index 0000000..2fc0eb6
--- /dev/null
+++ b/util/switch.c
@@ -0,0 +1,65 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <ftdi.h>
+
+#define DEV_FE310   1
+#define DEV_ESP32   2
+
+void usage(char *p) {
+    fprintf(stderr, "Usage: %s fe310|esp32\n", p);
+    exit(1);
+}
+
+int main(int argc, char *argv[]) {
+    int dev;
+    int ret;
+    struct ftdi_context *ftdi;
+
+    if (argc != 2) {
+        usage(argv[0]);
+    }
+    if (strcmp(argv[1], "fe310") == 0) {
+        dev = DEV_FE310;
+    } else if (strcmp(argv[1], "esp32") == 0) {
+        dev = DEV_ESP32;
+    } else {
+        usage(argv[0]);
+    }
+
+    if ((ftdi = ftdi_new()) == 0) {
+        fprintf(stderr, "ftdi_new failed\n");
+        return EXIT_FAILURE;
+    }
+
+    if ((ret = ftdi_usb_open(ftdi, 0x0403, 0x6015)) < 0) {
+        fprintf(stderr, "unable to open ftdi device: %d (%s)\n", ret, ftdi_get_error_string(ftdi));
+        ftdi_free(ftdi);
+        return EXIT_FAILURE;
+    }
+
+    switch (dev) {
+        case DEV_FE310: {
+            printf("Switch to fe310\n");
+            ret = ftdi_set_bitmode(ftdi, 0x20, BITMODE_CBUS);
+            break;
+        }
+
+        case DEV_ESP32: {
+            printf("Switch to esp32\n");
+            ret = ftdi_set_bitmode(ftdi, 0x00, BITMODE_CBUS);
+            break;
+        }
+    }
+    if (ret < 0) goto ftdi_fin;
+
+    ret = ftdi_usb_close(ftdi);
+
+ftdi_fin:
+    if (ret < 0) {
+        fprintf(stderr, "ERR: %d (%s)\n", ret, ftdi_get_error_string(ftdi));
+    }
+    ftdi_free(ftdi);
+
+    return ret < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}