Initial experiments with SPI.

1 files changed, 24 insertions, 0 deletions

diff --git a/firmware/src/dac.c b/firmware/src/dac.c
new file mode 100644
index 0000000..2773f00
--- /dev/null
+++ b/firmware/src/dac.c
@@ -0,0 +1,24 @@
+#include "dac.h"
+
+//#include "api.h"
+#include <LPC17xx.h>
+
+void dac_init()
+{
+  // setup the related pin to DAC output 
+  LPC_PINCON->PINSEL1 = 0x00200000;	// set p0.26 to DAC output   
+	
+	// Clock tick pr. sample delay (DAC clock)
+  LPC_DAC->DACCNTVAL = 2267; // 44111Hz
+  LPC_DAC->DACCTRL = (0x1<<1)|(0x1<<2);
+	LPC_SC->PCLKSEL0 |= (0x1 << 22); // Use full 100MHz clock 
+}
+
+#define VOL 1
+void dac_play_samples(const short int *samples, int size)
+{
+  for(int i = 0; i < size; i++) {
+		LPC_DAC->DACR = ((unsigned short)(samples[i] * VOL)<< 6);// | DAC_BIAS;
+		for(int j = 0; j < 100; j++) { if(!LPC_DAC->DACR) LPC_DAC->DACR = 0; }
+  }
+}