watch library: implement SPI

3 files changed, 116 insertions, 0 deletions

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);
 }
diff --git a/watch-library/hardware/hw/driver_init.h b/watch-library/hardware/hw/driver_init.h
index 6b5abaf3..90cb8867 100644
--- a/watch-library/hardware/hw/driver_init.h
+++ b/watch-library/hardware/hw/driver_init.h
@@ -43,12 +43,18 @@ extern struct i2c_m_sync_desc I2C_0;
 
 extern struct usart_sync_descriptor USART_0;
 
+extern struct spi_m_sync_descriptor SPI_0;
+
 extern struct slcd_sync_descriptor SEGMENT_LCD_0;
 
 void I2C_0_CLOCK_init(void);
 void I2C_0_init(void);
 void I2C_0_PORT_init(void);
 
+void SPI_0_PORT_init(void);
+void SPI_0_CLOCK_init(void);
+void SPI_0_init(void);
+
 void delay_driver_init(void);
 
 void EXTERNAL_IRQ_0_init(void);
diff --git a/watch-library/hardware/watch/watch_spi.c b/watch-library/hardware/watch/watch_spi.c
new file mode 100644
index 00000000..df68bbaa
--- /dev/null
+++ b/watch-library/hardware/watch/watch_spi.c
@@ -0,0 +1,46 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Joey Castillo
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "watch_spi.h"
+
+struct io_descriptor *spi_io;
+
+void watch_enable_spi(void) {
+    SPI_0_init();
+    spi_m_sync_get_io_descriptor(&SPI_0, &spi_io);
+    spi_m_sync_enable(&SPI_0);
+}
+
+void watch_disable_spi(void) {
+    spi_m_sync_disable(&SPI_0);
+    spi_io = NULL;
+}
+
+void watch_spi_send(uint8_t *buf, uint16_t length) {
+	io_write(spi_io, buf, length);
+}
+
+void watch_spi_receive(uint8_t *buf, uint16_t length) {
+	io_read(spi_io, buf, length);
+}