From 5e1cb6080fcd214676bceba1681d94ae1054513d Mon Sep 17 00:00:00 2001
From: Yilin Sun <imi415@imi.moe>
Date: Sun, 4 Jun 2023 00:40:19 +0800
Subject: [PATCH] Implemented DAC.

Signed-off-by: Yilin Sun <imi415@imi.moe>
---
 CMakeLists.txt    |  1 +
 include/app_dac.h |  8 ++++
 src/app_dac.c     | 93 +++++++++++++++++++++++++++++++++++++++++++++++
 src/app_reg_if.c  | 11 +++++-
 src/main.c        |  5 ++-
 5 files changed, 115 insertions(+), 3 deletions(-)
 create mode 100644 include/app_dac.h
 create mode 100644 src/app_dac.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8d1a8fc..87ed163 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,6 +44,7 @@ set(TARGET_SOURCES
     "board/peripherals.c"
     "board/pin_mux.c"
     "src/app_adc.c"
+    "src/app_dac.c"
     "src/app_i2c_if.c"
     "src/app_gpio.c"
     "src/app_reg_if.c"
diff --git a/include/app_dac.h b/include/app_dac.h
new file mode 100644
index 0000000..9ded8b6
--- /dev/null
+++ b/include/app_dac.h
@@ -0,0 +1,8 @@
+#ifndef APP_DAC_H
+#define APP_DAC_H
+
+void     app_dac_init(void);
+uint16_t app_dac_module_reg_read(uint8_t addr);
+void     app_dac_module_reg_write(uint8_t addr, uint16_t data);
+
+#endif  // APP_DAC_H
diff --git a/src/app_dac.c b/src/app_dac.c
new file mode 100644
index 0000000..109159e
--- /dev/null
+++ b/src/app_dac.c
@@ -0,0 +1,93 @@
+/* Board */
+#include "clock_config.h"
+#include "pin_mux.h"
+
+/* SDK drivers */
+#include "fsl_clock.h"
+#include "fsl_dac.h"
+#include "fsl_power.h"
+
+/* Private */
+#include "app_dac.h"
+
+#define APP_DAC_REG_OFFSET_CTRL (0x00U)
+#define APP_DAC_REG_OFFSET_DATA (0x01U)
+
+#define APP_DAC_CTRL_BIAS_Pos (8U)
+#define APP_DAC_CTRL_BIAS_Msk (1U << APP_DAC_CTRL_BIAS_Pos)
+
+static inline uint16_t app_dac_read_reg_ctrl(void);
+static inline uint16_t app_dac_read_reg_data(void);
+static inline void     app_dac_write_reg_ctrl(uint16_t data);
+static inline void     app_dac_write_reg_data(uint16_t data);
+
+void app_dac_init(void) {
+    POWER_DisablePD(kPDRUNCFG_PD_DAC0);
+    CLOCK_EnableClock(kCLOCK_Dac);
+
+    RESET_PeripheralReset(kDAC0_RST_N_SHIFT_RSTn);
+
+    DAC0->CR   = 0UL;
+    DAC0->CTRL = 0UL;
+}
+
+uint16_t app_dac_module_reg_read(uint8_t addr) {
+    uint16_t ret = 0x5555;
+
+    switch (addr) {
+        case APP_DAC_REG_OFFSET_CTRL:
+            ret = app_dac_read_reg_ctrl();
+            break;
+        case APP_DAC_REG_OFFSET_DATA:
+            ret = app_dac_read_reg_data();
+            break;
+        default:
+            break;
+    }
+
+    return ret;
+}
+
+void app_dac_module_reg_write(uint8_t addr, uint16_t data) {
+    switch (addr) {
+        case APP_DAC_REG_OFFSET_CTRL:
+            app_dac_write_reg_ctrl(data);
+            break;
+        case APP_DAC_REG_OFFSET_DATA:
+            app_dac_write_reg_data(data);
+            break;
+        default:
+            break;
+    }
+}
+
+static inline uint16_t app_dac_read_reg_ctrl(void) {
+    uint16_t ret = 0x0000U;
+
+    if (DAC0->CR & DAC_CR_BIAS_MASK) {
+        ret |= APP_DAC_CTRL_BIAS_Msk;
+    }
+
+    return ret;
+}
+
+static inline uint16_t app_dac_read_reg_data(void) {
+    return ((DAC0->CR & DAC_CR_VALUE_MASK) >> DAC_CR_VALUE_SHIFT);
+}
+
+static inline void app_dac_write_reg_ctrl(uint16_t data) {
+    if (data & APP_DAC_CTRL_BIAS_Msk) {
+        DAC0->CR |= DAC_CR_BIAS_MASK;
+    } else {
+        DAC0->CR &= ~DAC_CR_BIAS_MASK;
+    }
+}
+
+static inline void app_dac_write_reg_data(uint16_t data) {
+    uint32_t cr = DAC0->CR;
+
+    cr &= ~DAC_CR_VALUE_MASK;
+    cr |= DAC_CR_VALUE(data);
+
+    DAC0->CR = cr;
+}
\ No newline at end of file
diff --git a/src/app_reg_if.c b/src/app_reg_if.c
index 182a6d0..a2b3655 100644
--- a/src/app_reg_if.c
+++ b/src/app_reg_if.c
@@ -1,5 +1,6 @@
 /* App */
 #include "app_adc.h"
+#include "app_dac.h"
 #include "app_gpio.h"
 #include "app_sys_utils.h"
 
@@ -9,7 +10,8 @@
 #define MODULE_ID_SYS_UTILS 0
 #define MODULE_ID_GPIO      1
 #define MODULE_ID_ADC       2
-#define MODULE_ID_END       3
+#define MODULE_ID_DAC       3
+#define MODULE_ID_END       4
 
 typedef uint16_t (*module_reg_read_t)(uint8_t offset);
 typedef void (*module_reg_write_t)(uint8_t offset, uint16_t data);
@@ -19,7 +21,7 @@ typedef struct {
     module_reg_write_t write;
 } module_reg_t;
 
-static const module_reg_t s_module_regs[] = {
+static const module_reg_t s_module_regs[MODULE_ID_END] = {
     [MODULE_ID_SYS_UTILS] =
         {
             .read  = app_sys_utils_module_reg_read,
@@ -35,6 +37,11 @@ static const module_reg_t s_module_regs[] = {
             .read  = app_adc_module_reg_read,
             .write = app_adc_module_reg_write,
         },
+    [MODULE_ID_DAC] =
+        {
+            .read  = app_dac_module_reg_read,
+            .write = app_dac_module_reg_write,
+        },
 };
 
 uint16_t app_reg_if_read(uint8_t reg) {
diff --git a/src/main.c b/src/main.c
index 4541e9c..500c7a0 100644
--- a/src/main.c
+++ b/src/main.c
@@ -5,16 +5,19 @@
 
 /* App */
 #include "app_adc.h"
+#include "app_dac.h"
 #include "app_gpio.h"
 #include "app_i2c_if.h"
-#include "app_led.h"
+#include "app_sys_utils.h"
 
 int main(void) {
     BOARD_InitBootPins();
     BOARD_InitBootClocks();
 
+    app_sys_utils_init();
     app_gpio_init();
     app_adc_init();
+    app_dac_init();
     app_i2c_if_init();
 
     for (;;) {