altos: Add metro-m0 port for SAMD21G18 testing

Useful as a test target

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/metro-m0/ao_pins.h b/src/metro-m0/ao_pins.h
new file mode 100644 (file)
index 0000000..285d991
--- /dev/null
+++ b/src/metro-m0/ao_pins.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright © 2022 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#ifndef _AO_PINS_H_
+#define _AO_PINS_H_
+
+#define LED_0_PORT     (&samd21_port_a)
+#define LED_0_PIN      2
+
+#define LED_BLUE       (1 << 0)
+
+#define AO_LED_PANIC   LED_BLUE
+
+#define HAS_BEEP       0
+
+#define HAS_USB                1
+#define USE_USB_STDIO  1
+
+#define HAS_LED                1
+
+#define AO_DFLL48M             48000000
+#define AO_XOSC32K             32768
+
+#define AO_AHB_PRESCALER       1
+#define AO_APBA_PRESCALER      1
+
+#define HAS_SPI_0              1
+#define SPI_0_PA08_PA09_PA10   1
+
+#endif /* _AO_PINS_H_ */

diff --git a/src/metro-m0/flash-loader/ao_pins.h b/src/metro-m0/flash-loader/ao_pins.h
new file mode 100644 (file)
index 0000000..9a62148
--- /dev/null
+++ b/src/metro-m0/flash-loader/ao_pins.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright © 2013 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#ifndef _AO_PINS_H_
+#define _AO_PINS_H_
+
+#include <ao_flash_samd21_pins.h>
+
+/* A0 to gnd for boot loader mode */
+
+#define AO_BOOT_PIN                    1
+#define AO_BOOT_APPLICATION_GPIO       (samd21_port_a)
+#define AO_BOOT_APPLICATION_PIN                2
+#define AO_BOOT_APPLICATION_VALUE      1
+#define AO_BOOT_APPLICATION_MODE       AO_MODE_PULL_UP
+
+/* USB */
+#define HAS_USB                        1
+
+#define AO_DFLL48M             48000000
+#define AO_XOSC32K             32768
+
+#endif /* _AO_PINS_H_ */

diff --git a/src/metro-m0/metro-m0.c b/src/metro-m0/metro-m0.c
new file mode 100644 (file)
index 0000000..32b241e
--- /dev/null
+++ b/src/metro-m0/metro-m0.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <ao.h>
+#include <ao_led.h>
+#include <ao_dma_samd21.h>
+
+#define SNEK_CS_PORT   (&samd21_port_a)
+#define SNEK_CS_PIN    (11)
+#define SNEK_SPI_INDEX AO_SPI_0_PA08_PA09_PA10
+#define SNEK_SPI_SPEED ao_spi_speed(1000000)
+
+static const uint8_t spi_test[] = {
+       0xaa,
+       0xcc,
+       0xff,
+       0x00
+};
+
+static void
+ao_spi_test(void)
+{
+       ao_spi_get_bit(SNEK_CS_PORT, SNEK_CS_PIN, SNEK_SPI_INDEX, SNEK_SPI_SPEED);
+       ao_spi_send(spi_test, sizeof(spi_test), SNEK_SPI_INDEX);
+       ao_spi_put_bit(SNEK_CS_PORT, SNEK_CS_PIN, SNEK_SPI_INDEX);
+}
+
+const struct ao_cmds ao_spi_cmds[] = {
+       { ao_spi_test,  "s \0Send some bytes over spi" },
+       { 0, NULL },
+};
+
+int main(void)
+{
+       ao_led_init();
+       ao_clock_init();
+       ao_task_init();
+       ao_timer_init();
+       ao_dma_init();
+       ao_spi_init();
+       ao_usb_init();
+       ao_cmd_register(ao_spi_cmds);
+       ao_spi_init_cs(&samd21_port_a, 1 << 11); /* analog 8 for CS */
+       ao_cmd_init();
+       ao_start_scheduler();
+       return 0;
+}