add atsams70

c2860238 · Jake Read · 4c56e155 · 4c56e155 · c2860238 · c2860238
Commit c2860238 authored 7 years ago by Jake Read
--- a/.DS_Store
+++ b/.DS_Store
--- a/gpio/atsams70/atsams70_main.c
+++ b/gpio/atsams70/atsams70_main.c
+int main (void)
+{
+  /* Insert system clock initialization code here (sysclk_init()). */
+
+  board_init();
+  sysclk_init();
+
+  /* Insert application code here, after the board has been initialized. */
+  // startup the PIOA peripheral clock - only necessary for Inputs and Interrupts
+  PMC->PMC_PCER0 = 1 << ID_PIOA;
+
+  // Peripheral Enable Register
+  // Set PER to 1 at the pin to enable the PIO peripheral,
+  // set PDR (peripheral disable register) to 1 to clear that, opening the pin up for other peripherals (uart, etc)
+  PIOA->PIO_PER |= PIO_PER_P28 | PIO_PER_P15;
+  // Output Enable Register
+  PIOA->PIO_OER = PIO_PER_P28;
+  // Output Disable Register
+  PIOA->PIO_ODR = PIO_PER_P15;
+  // B1 pulls PA15 to GND
+
+  while (1) {
+    // Clear Output Data Register (open drain)
+    if(PIOA->PIO_PDSR & PIO_PER_P15){
+      PIOA->PIO_CODR = PIO_PER_P28;
+    } else {
+      PIOA->PIO_SODR = PIO_PER_P28;
+    }
+  }
+}
--- a/gpio/atsams70/index.html
+++ b/gpio/atsams70/index.html
+<html>
+<head>
+<style>
+pre code {
+  background-color: #eee;
+  border: 1px solid #999;
+  display: block;
+  padding: 20px;
+}
+</style>
+
+
+</head>
+<body>
+
+<h1>ATSAM4S</h1>
+
+<figure>
+<img src='ring.png' height=50%>
+<figcaption>Ring oscillator with ATSAMS70</figcaption>
+</figure>
+
+<p>This ring oscillator runs on the ATSAMS70 MCU using a homebrew dev-board documented <a href='https://gitlab.cba.mit.edu/jakeread/tinynets/tree/master/embedded'>here</a>. The ATSAMS70 has an ARM Cortex-M7 running with a max speed of 300 MHz.  C code for the oscillator is available <a href='atsams70_main.c'>here</a>, or visible below.</p>
+
+<pre>
+<code>#include <asf.h>
+
+int main (void)
+{
+  /* Insert system clock initialization code here (sysclk_init()). */
+
+  board_init();
+  sysclk_init();
+
+  /* Insert application code here, after the board has been initialized. */
+  // startup the PIOA peripheral clock - only necessary for Inputs and Interrupts
+  PMC->PMC_PCER0 = 1 << ID_PIOA;
+
+  // Peripheral Enable Register
+  // Set PER to 1 at the pin to enable the PIO peripheral,
+  // set PDR (peripheral disable register) to 1 to clear that, opening the pin up for other peripherals (uart, etc)
+  PIOA->PIO_PER |= PIO_PER_P28 | PIO_PER_P15;
+  // Output Enable Register
+  PIOA->PIO_OER = PIO_PER_P28;
+  // Output Disable Register
+  PIOA->PIO_ODR = PIO_PER_P15;
+  // B1 pulls PA15 to GND
+
+  while (1) {
+    // Clear Output Data Register (open drain)
+    if(PIOA->PIO_PDSR & PIO_PER_P15){
+      PIOA->PIO_CODR = PIO_PER_P28;
+    } else {
+      PIOA->PIO_SODR = PIO_PER_P28;
+    }
+  }
+}
+
+</code>
+</pre>
+
+<p>Oddly, the ring would bounce between 5.7MHz and 3.7MHz - I'm guessing that this is due to the GPIO peripheral occasionally sampling on a 'close' edge of it's 150MHz peripheral clock or on 'the next edge' ... if that makes any sense.</p>
+
+<p><a href='../../index.html'>Back</a></p>
+
+</body>
+
+</html>
\ No newline at end of file
--- a/gpio/atsams70/ring.png
+++ b/gpio/atsams70/ring.png
--- a/rf/.DS_Store
+++ b/rf/.DS_Store
--- a/rf/m0_rfm95_lora/.DS_Store
+++ b/rf/m0_rfm95_lora/.DS_Store
--- a/ring.json
+++ b/ring.json
@@ -63,6 +63,16 @@
 		}
 	],
 	"gpio":[
+		{
+			"name":"ATSAMS70",
+			"serial_number":"",
+			"subdirectory_path":"gpio/atsams70",
+			"dev_board_price":15.00,
+			"dev_board_sales link":"",
+			"ic_price":9.55,
+			"ic_sales_link":"",
+			"ring_period":0.17
+		},
 		{
 			"name":"ATSAM4S",
 			"serial_number":"",