From a11275d84c4ca04645eec72b1d1612d0781e0486 Mon Sep 17 00:00:00 2001
From: Joey Castillo <joeycastillo@utexas.edu>
Date: Wed, 26 Jan 2022 21:32:55 -0500
Subject: watch library: implement SPI

---
 watch-library/hardware/hw/driver_init.c | 64 +++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

(limited to 'watch-library/hardware/hw/driver_init.c')

diff --git a/watch-library/hardware/hw/driver_init.c b/watch-library/hardware/hw/driver_init.c
index 09723bec..3e097a8e 100644
--- a/watch-library/hardware/hw/driver_init.c
+++ b/watch-library/hardware/hw/driver_init.c
@@ -15,6 +15,8 @@ struct slcd_sync_descriptor SEGMENT_LCD_0;
 
 struct i2c_m_sync_desc I2C_0;
 
+struct spi_m_sync_descriptor SPI_0;
+
 void I2C_0_PORT_init(void) {
 
 	gpio_set_pin_pull_mode(SDA,
@@ -50,6 +52,68 @@ void I2C_0_init(void) {
 	I2C_0_PORT_init();
 }
 
+void SPI_0_PORT_init(void) {
+
+	gpio_set_pin_level(A2,
+	                   // <y> Initial level
+	                   // <id> pad_initial_level
+	                   // <false"> Low
+	                   // <true"> High
+	                   false);
+
+	// Set pin direction to output
+	gpio_set_pin_direction(A2, GPIO_DIRECTION_OUT);
+
+	gpio_set_pin_function(A2, PINMUX_PB02C_SERCOM3_PAD0);
+
+	// Set pin direction to input
+	gpio_set_pin_direction(A4, GPIO_DIRECTION_IN);
+
+	gpio_set_pin_pull_mode(A4,
+	                       // <y> Pull configuration
+	                       // <id> pad_pull_config
+	                       // <GPIO_PULL_OFF"> Off
+	                       // <GPIO_PULL_UP"> Pull-up
+	                       // <GPIO_PULL_DOWN"> Pull-down
+	                       GPIO_PULL_OFF);
+
+	gpio_set_pin_function(A4, PINMUX_PB00C_SERCOM3_PAD2);
+
+	gpio_set_pin_level(A1,
+	                   // <y> Initial level
+	                   // <id> pad_initial_level
+	                   // <false"> Low
+	                   // <true"> High
+	                   false);
+
+	// Set pin direction to output
+	gpio_set_pin_direction(A1, GPIO_DIRECTION_OUT);
+
+	gpio_set_pin_function(A1, PINMUX_PB01C_SERCOM3_PAD3);
+
+	gpio_set_pin_level(A3,
+	                   // <y> Initial level
+	                   // <id> pad_initial_level
+	                   // <false"> Low
+	                   // <true"> High
+	                   true);
+
+	// Set pin direction to output
+	gpio_set_pin_direction(A3, GPIO_DIRECTION_OUT);
+}
+
+void SPI_0_CLOCK_init(void) {
+	hri_gclk_write_PCHCTRL_reg(GCLK, SERCOM3_GCLK_ID_CORE, CONF_GCLK_SERCOM3_CORE_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));
+	hri_gclk_write_PCHCTRL_reg(GCLK, SERCOM3_GCLK_ID_SLOW, CONF_GCLK_SERCOM3_SLOW_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));
+	hri_mclk_set_APBCMASK_SERCOM3_bit(MCLK);
+}
+
+void SPI_0_init(void) {
+	SPI_0_CLOCK_init();
+	spi_m_sync_init(&SPI_0, SERCOM3);
+	SPI_0_PORT_init();
+}
+
 void delay_driver_init(void) {
 	delay_init(SysTick);
 }
-- 
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