Removed STM32 flash code, replaced with barebones hacks for now.

At this point, there shouldn't be any STM code being compiled and linked
against. There are still a bunch of STM header includes, though.

1 files changed, 29 insertions, 0 deletions

diff --git a/libmaple/flash.c b/libmaple/flash.c
new file mode 100644
index 0000000..a3ee26b
--- /dev/null
+++ b/libmaple/flash.c
@@ -0,0 +1,29 @@
+#include "libmaple.h"
+#include "flash.h"
+
+#define ACR_PRFTBE                ((uint32)0xFFFFFFEF)
+#define ACR_PRFTBE_ENABLE ((uint32)0x00000010)  /* FLASH Prefetch Buffer Enable */
+#define ACR_PRFTBE_DISABLE ((uint32)0x00000000)  /* FLASH Prefetch Buffer Disable */
+
+#define ACR_LATENCY               ((uint32)0x00000038)
+#define ACR_LATENCY_0                ((uint32)0x00000000)  /* FLASH Zero Latency cycle */
+#define ACR_LATENCY_1                ((uint32)0x00000001)  /* FLASH One Latency cycle */
+#define ACR_LATENCY_2                ((uint32)0x00000002)  /* FLASH Two Latency cycles */
+
+void flash_enable_prefetch(void) {
+   uint32 acr = __read(FLASH_ACR);
+
+   acr &= ACR_PRFTBE;
+   acr |= ACR_PRFTBE_ENABLE;
+
+   __write(FLASH_ACR, acr);
+}
+
+void flash_set_latency(void) {
+   uint32 acr = __read(FLASH_ACR);
+
+   acr &= ACR_LATENCY;
+   acr |= ACR_LATENCY_2;
+
+   __write(FLASH_ACR, acr);
+}