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Diffstat (limited to 'code/fe310/bsp/gloss/sys_read.c')
-rw-r--r--code/fe310/bsp/gloss/sys_read.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/code/fe310/bsp/gloss/sys_read.c b/code/fe310/bsp/gloss/sys_read.c
new file mode 100644
index 0000000..1857fc6
--- /dev/null
+++ b/code/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;
+}