Add CDC stdio driver and logging + panic handlers

1 files changed, 84 insertions, 0 deletions

diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..5a6cf2d
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,84 @@
+#include "util.h"
+#include "board.h"
+#include "neopix.h"
+
+#include "tusb.h"
+#include "bsp/board.h"
+#include "tusb_config.h"
+
+#include <stdio.h>
+
+int loglevel = LOG_WARN;
+
+static void
+__attribute__((format(printf, 1, 0)))
+panic_task(const char *fmtstr, va_list ap)
+{
+	va_list cpy;
+	char c;	
+
+	if (!tud_cdc_available())
+		return;
+
+	if (!tud_cdc_read(&c, 1))
+		return;
+
+	va_copy(cpy, ap);
+	vprintf(fmtstr, cpy);
+	printf("\n\r");
+}
+
+static void
+blink_task(struct neopix *pix, uint32_t blink_ms)
+{
+	static uint32_t start_ms = 0;
+	static bool led_state = false;
+
+	if (!start_ms) start_ms = board_millis();
+
+	if (board_millis() - start_ms < blink_ms)
+		return;
+
+	neopix_put(pix, neopix_u32rgb(255 * led_state, 0, 0));
+
+	led_state ^= true;
+	start_ms += blink_ms;
+}
+
+void
+__attribute__ ((format (printf, 2, 3)))
+stdio_log(int level, const char *fmtstr, ...)
+{
+	va_list ap;
+
+	if (!tud_cdc_available())
+		return;
+
+	if (level > loglevel)
+		return;
+
+	va_start(ap, fmtstr);
+	vprintf(fmtstr, ap);
+	va_end(ap);
+	printf("\n\r");
+}
+
+void
+__attribute__((format(printf, 1, 2)))
+blink_panic(const char *fmtstr, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmtstr);
+
+	if (!onboard_led.init)
+		neopix_init(&onboard_led, pio0, 0, ONBOARD_LED_PIN);
+
+	while (1) {
+		tud_task();
+		panic_task(fmtstr, ap);
+		blink_task(&onboard_led, 200);
+	}
+
+	va_end(ap);
+}