diff --git a/.DS_Store b/.DS_Store
deleted file mode 100644
index f9a77a043abb1846f71d351797f025023bc78fe0..0000000000000000000000000000000000000000
Binary files a/.DS_Store and /dev/null differ
diff --git a/gpio/atsams70/atsams70_main.c b/gpio/atsams70/atsams70_main.c
new file mode 100644
index 0000000000000000000000000000000000000000..24c054db706b3d8cd6de717f676030451783c6cb
--- /dev/null
+++ b/gpio/atsams70/atsams70_main.c
@@ -0,0 +1,30 @@
+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;
+ }
+ }
+}
diff --git a/gpio/atsams70/index.html b/gpio/atsams70/index.html
new file mode 100644
index 0000000000000000000000000000000000000000..4dbc39645dea668a255395b95bb71ee0aed76197
--- /dev/null
+++ b/gpio/atsams70/index.html
@@ -0,0 +1,68 @@
+<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
diff --git a/gpio/atsams70/ring.png b/gpio/atsams70/ring.png
new file mode 100644
index 0000000000000000000000000000000000000000..4b097c8bda193d7b7e4f512f6466732c57c527e7
Binary files /dev/null and b/gpio/atsams70/ring.png differ
diff --git a/rf/.DS_Store b/rf/.DS_Store
deleted file mode 100644
index a4bfe30f496628d9c8e3c4aa8725d75ddbfa8270..0000000000000000000000000000000000000000
Binary files a/rf/.DS_Store and /dev/null differ
diff --git a/rf/m0_rfm95_lora/.DS_Store b/rf/m0_rfm95_lora/.DS_Store
deleted file mode 100644
index 30e5fa8514eaff6a5ab69a93bf29dbb546942626..0000000000000000000000000000000000000000
Binary files a/rf/m0_rfm95_lora/.DS_Store and /dev/null differ
diff --git a/ring.json b/ring.json
index 1eeb3856fb75852f44527a84cbe733c245d2bf8b..ff6c7415644184e201a0b8d4db4f00d807c9faa5 100644
--- 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":"",