From cf7c06297d04bade9cd04c056f9ed510e64dd7bd Mon Sep 17 00:00:00 2001
From: Uros Majstorovic <majstor@majstor.org>
Date: Wed, 5 Aug 2020 03:39:22 +0200
Subject: code -> fw

---
 fw/fe310/bsp/gloss/sys_read.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 fw/fe310/bsp/gloss/sys_read.c

(limited to 'fw/fe310/bsp/gloss/sys_read.c')

diff --git a/fw/fe310/bsp/gloss/sys_read.c b/fw/fe310/bsp/gloss/sys_read.c
new file mode 100644
index 0000000..1857fc6
--- /dev/null
+++ b/fw/fe310/bsp/gloss/sys_read.c
@@ -0,0 +1,23 @@
+#include <sys/types.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include "platform.h"
+
+/* Read from a file.  */
+ssize_t
+_read(int fd, void *ptr, size_t len)
+{
+  if (fd != STDIN_FILENO) {
+    errno = ENOSYS;
+    return -1;
+  }
+
+  char *current = ptr;
+  for (size_t i = 0; i < len; i++) {
+    volatile uint32_t r;
+    while ((r = UART0_REG(UART_REG_RXFIFO)) & 0x80000000);
+    current[i] = r & 0xFF;
+  }
+  return len;
+}
-- 
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