From: Vladimir Burian <buriavl2@fel.cvut.cz>
Date: Sat, 12 Feb 2011 23:17:08 +0000 (+0100)
Subject: PWM test added to the software.
X-Git-Url: https://rtime.felk.cvut.cz/gitweb/fpga/virtex2/uart.git/commitdiff_plain/d90e54632ccf2cc286e1c33c802211e7f7ebdc08?ds=sidebyside

PWM test added to the software.
---

diff --git a/software/hardware.h b/software/hardware.h
index 9255487..446e40b 100644
--- a/software/hardware.h
+++ b/software/hardware.h
@@ -31,4 +31,8 @@ sfrb(USTAT, USTAT_);
 sfrb(UIE, UIE_);
 
 
+//PWM output
+#define PWM_              0x0160
+sfrw(PWM, PWM_);
+
 #endif
diff --git a/software/main.c b/software/main.c
index 4423505..586363a 100644
--- a/software/main.c
+++ b/software/main.c
@@ -1,13 +1,16 @@
 /**
 This is a sample application for openMSP430 softcore MCU with external HW UART
-peripheral <git@rtime.felk.cvut.cz:fpga/uart> and quadcount peripheral.
+periphery <git@rtime.felk.cvut.cz:fpga/uart> and quadcount and pwm periphery.
 
 First of all "Hello world" is printed and then application works like echo and
 also prints quadrature count whenever its value is changed.
 
-AB error of quadrature counter peripheral is handled by irq routine which prints
+AB error of quadrature counter periphery is handled by irq routine which prints
 message "IRQ: QCounter AB error!".
 
+In endless main loop, when nothing else is doing, triangle singnal is being 
+generated by the PWM periphery.
+
 Baudrate is set to 115200.
 */
 
@@ -85,6 +88,8 @@ int main(void) {
     uint32_t qcnt = qcount();
     uint32_t qcnt_new;
 
+    int sign = 1;
+
     //UBAUD = 0x04E1;                     //24.00MHz - 9600 baud
     UBAUD = 0x0067;                     //24.00MHz - 115200 baud
 
@@ -103,6 +108,12 @@ int main(void) {
         printf("[QCount = 0x%08lX]\n", qcnt_new);
         qcnt = qcnt_new;
       }
+      
+      if (sign) {
+        if (++PWM == 0xFFFF) sign = 0;
+      } else {
+        if (--PWM == 0x0000) sign = 1;
+      }
     }
 
 }