1 files changed, 61 insertions, 0 deletions
diff --git a/demos/ARM7-AT91SAM7X-GCC/board.c b/demos/ARM7-AT91SAM7X-GCC/board.c
index 2ebad09e2..bc0d46189 100644
--- a/demos/ARM7-AT91SAM7X-GCC/board.c
+++ b/demos/ARM7-AT91SAM7X-GCC/board.c
@@ -21,5 +21,66 @@
 
 #include "at91lib/AT91SAM7X256.h"
 
+extern void FiqHandler(void);
+
+__attribute__((interrupt("IRQ")))
+static void SpuriousHandler(void) {
+
+  AT91C_BASE_AIC->AIC_EOICR = (AT91_REG)AT91C_BASE_AIC;
+}
+
 void hwinit(void) {
+  int i;
+  AT91PS_PMC pmcp = AT91C_BASE_PMC;
+  AT91PS_AIC aicp = AT91C_BASE_AIC;
+
+  /*
+   * Flash Memory: 1 wait state, about 50 cycles in a microsecond.
+   */
+  AT91C_BASE_MC->MC_FMR = (AT91C_MC_FMCN & (50 << 16)) | AT91C_MC_FWS_1FWS;
+
+  /*
+   * Watchdog disabled.
+   */
+  AT91C_BASE_WDTC->WDTC_WDMR = AT91C_WDTC_WDDIS;
+
+  /*
+   * Enables the main oscillator and waits 56 slow cycles as startup time.
+   */
+  pmcp->PMC_MOR = (AT91C_CKGR_OSCOUNT & (7 << 8)) | AT91C_CKGR_MOSCEN;
+  while (!(pmcp->PMC_SR & AT91C_PMC_MOSCS))
+    ;
+
+  /*
+   * PLL setup: DIV = 14, MUL = 72, PLLCOUNT = 10
+   * PLLfreq = 96109714 Hz (rounded)
+   */
+  pmcp->PMC_PLLR = (AT91C_CKGR_DIV & 14) |
+                   (AT91C_CKGR_PLLCOUNT & (10 << 8)) |
+                   (AT91C_CKGR_MUL & (72 << 16));
+  while (!(pmcp->PMC_SR & (AT91C_PMC_LOCK)))
+    ;
+
+  /*
+   * Master clock = PLLfreq / 2 = 48054858 Hz (rounded)
+   */
+  pmcp->PMC_MCKR = AT91C_PMC_CSS_PLL_CLK | AT91C_PMC_PRES_CLK_2;
+  while (!(pmcp->PMC_SR & (AT91C_PMC_MCKRDY)))
+    ;
+
+  /*
+   * Default AIC setup, the device drivers will modify it as needed.
+   */
+  aicp->AIC_SVR[0] = (AT91_REG)FiqHandler;
+  for (i = 1; i < 31; i++) {
+    aicp->AIC_SVR[i] = (AT91_REG)NULL;
+    aicp->AIC_EOICR = (AT91_REG)i;
+  }
+  aicp->AIC_SPU  = (AT91_REG)SpuriousHandler;
+
+  /*
+   * I/O setup, enable clocks, initially all pins are inputs with pullups.
+   */
+  pmcp->PMC_PCER = (1 << AT91C_ID_PIOA) | (1 << AT91C_ID_PIOB);
+  AT91C_BASE_PIOA->PIO_PER = 0xFFFFFFFF;
 }