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authorVasil Zlatanov <v@skozl.com>2017-05-08 11:47:11 +0100
committerVasil Zlatanov <v@skozl.com>2017-05-08 11:47:11 +0100
commitada3557c0a579f89f20ee3d1da7e1cceb24685db (patch)
treedc017862997e39ad5c7157624cc7b9a67c3f7086 /src
parent3b6bce92d0ea349e744daea8f84a703feec832a5 (diff)
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Add support for square and sine waves
Diffstat (limited to 'src')
-rw-r--r--src/main.cpp35
1 files changed, 30 insertions, 5 deletions
diff --git a/src/main.cpp b/src/main.cpp
index 4ceb98e..1406b74 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -8,10 +8,12 @@
#define SW_PERIOD 20000 // 20ms
void tout(void);
-void pwm_invert_fast(void);
+void square(void);
+void triangle(void);
+void sine(void);
// Onboard LED
-DigitalOut out_wave(LED1);
+AnalogOut out_wave(p18);
PinName switch_pin[] = { SW_PINS };
Counter *switch_position[4];
@@ -25,7 +27,12 @@ volatile uint16_t last_pressed[4] = { 0, 0, 0, 0 };
uint16_t current_f[4] = { 0, 0, 0, 0 };
volatile uint16_t update = 0;
-volatile uint16_t divider = 0;
+volatile uint16_t amp = 0;
+
+const double pi = 3.141592653589793238462;
+const double offset = 65535/2;
+double rads = 0.0;
+uint16_t sample = 0;
// Initialise display
SPInit gSpi(D_MOSI_PIN, NC, D_CLK_PIN);
@@ -73,7 +80,7 @@ int main(void)
oled.printf("\nF:%u ", frequency);
if (frequency)
- pwm.attach_us(&pwm_invert_fast, 500000/frequency);
+ pwm.attach_us(&sine, 1000000/(frequency*360));
}
//Copy the display buffer to the display
@@ -103,6 +110,24 @@ void tout(void)
update = 1;
}
-void pwm_invert_fast(void){
+/*
+void square(void){
out_wave = !out_wave;
}
+*/
+void triangle(void){
+ amp++;
+ out_wave = (float) amp/256;
+ if (amp == 256)
+ amp = 0;
+}
+
+void sine(void){
+ rads = (pi * amp) / 180.0f;
+ sample = (uint16_t)(0.5f * (offset * (cos(rads + pi))) + offset);
+ out_wave.write_u16(sample);
+
+ amp++;
+ if(amp == 360)
+ amp = 0;
+}