cpu/lpc2387: implement periph/i2c

boards/mcb2388/Makefile.features

@@ -3,6 +3,7 @@ CPU_MODEL = lpc2388
 
 # Put defined MCU peripherals here (in alphabetical order)
 FEATURES_PROVIDED += periph_adc
+FEATURES_PROVIDED += periph_i2c
 FEATURES_PROVIDED += periph_rtc
 FEATURES_PROVIDED += periph_spi
 FEATURES_PROVIDED += periph_timer

boards/mcb2388/include/periph_conf.h

@@ -101,6 +101,33 @@ static const adc_conf_t adc_config[] = {
 };
 
 #define ADC_NUMOF           (1)
+
+/**
+ * @name I2C configuration
+ * @{
+ */
+static const i2c_conf_t i2c_config[] = {
+    {
+        .dev        = I2C0,
+        .speed      = I2C_SPEED_NORMAL,
+        .irq_prio   = 5,
+        .pinsel_sda = 1,
+        .pinsel_scl = 1,
+        .pinsel_msk_sda = BIT22,        /* P0.27 */
+        .pinsel_msk_scl = BIT24,        /* P0.28 */
+    },
+    {
+        .dev        = I2C1,
+        .speed      = I2C_SPEED_NORMAL,
+        .irq_prio   = 5,
+        .pinsel_sda = 1,
+        .pinsel_scl = 1,
+        .pinsel_msk_sda = BIT6 | BIT7,  /* P0.19 */
+        .pinsel_msk_scl = BIT8 | BIT9,  /* P0.20 */
+    },
+};
+
+#define I2C_NUMOF           (2)
 /** @} */
 
 #ifdef __cplusplus

boards/msba2/Makefile.features

@@ -2,6 +2,7 @@ CPU = lpc2387
 
 # Put defined MCU peripherals here (in alphabetical order)
 FEATURES_PROVIDED += periph_adc
+FEATURES_PROVIDED += periph_i2c
 FEATURES_PROVIDED += periph_pwm
 FEATURES_PROVIDED += periph_rtc
 FEATURES_PROVIDED += periph_spi

boards/msba2/include/periph_conf.h

@@ -155,6 +155,25 @@ static const adc_conf_t adc_config[] = {
 #define ADC_NUMOF           ARRAY_SIZE(adc_config)
 /** @} */
 
+/**
+ * @name I2C configuration
+ * @{
+ */
+static const i2c_conf_t i2c_config[] = {
+    {   /* JP3 */
+        .dev        = I2C2,
+        .speed      = I2C_SPEED_NORMAL,
+        .irq_prio   = 5,
+        .pinsel_sda = 0,
+        .pinsel_scl = 0,
+        .pinsel_msk_sda = BIT21, /* P0.10 */
+        .pinsel_msk_scl = BIT23, /* P0.11 */
+    },
+};
+
+/* used in arithmetic preprocessor expression, so no ARRAY_SIZE() */
+#define I2C_NUMOF           (1)
+/** @} */
 
 #ifdef __cplusplus
 }

cpu/lpc2387/include/periph_cpu.h

@@ -195,7 +195,40 @@ typedef struct {
     uint32_t pinsel_msk;    /**< PINSEL Mask for ADC pin */
 } adc_conf_t;
 
+/**
+ * @brief   Override I2C clock speed values
+ * @{
+ */
+#define HAVE_I2C_SPEED_T
+typedef enum {
+    I2C_SPEED_LOW    =  10000,  /**< low speed mode:  ~10 kbit/s */
+    I2C_SPEED_NORMAL = 100000,  /**< normal mode:    ~100 kbit/s */
+    I2C_SPEED_FAST   = 400000,  /**< fast mode:      ~400 kbit/s */
+} i2c_speed_t;
 /* @} */
+
+/**
+ * @brief   I2C device configuration
+ */
+typedef struct {
+    lpc23xx_i2c_t *dev;     /**< pointer to the I2C device  */
+    i2c_speed_t speed;      /**< I2C bus speed              */
+    uint8_t irq_prio;       /**< priority of the I2C IRQ    */
+    uint8_t pinsel_sda;     /**< PINSEL# of the SDA pin     */
+    uint8_t pinsel_scl;     /**< PINSEL# of the SCL pin     */
+    uint32_t pinsel_msk_sda;/**< SDA PINSEL Mask            */
+    uint32_t pinsel_msk_scl;/**< SCL PINSEL Mask            */
+} i2c_conf_t;
+/* @} */
+
+/**
+ * @name   Use shared I2C functions
+ * @{
+ */
+#define PERIPH_I2C_NEED_READ_REG
+#define PERIPH_I2C_NEED_WRITE_REG
+/** @} */
+
 #ifdef __cplusplus
 }
 #endif

cpu/lpc2387/include/vendor/lpc23xx.h

@@ -771,8 +771,35 @@ typedef struct {
 #define U3FDR          (*(volatile unsigned long *)(UART3_BASE_ADDR + 0x28))
 #define U3TER          (*(volatile unsigned long *)(UART3_BASE_ADDR + 0x30))
 
+/**
+ * @brief   Generic I2C register map
+ */
+typedef struct {
+    REG32   CONSET;         /**< Control Set Register       */
+    REG32   STAT;           /**< Status Register            */
+    REG32   DAT;            /**< Data Register              */
+    REG32   ADR;            /**< Slave Address Register     */
+    REG32   SCLH;           /**< Duty Cycle High Half Word  */
+    REG32   SCLL;           /**< Duty Cycle Low Half Word   */
+    REG32   CONCLR;         /**< Control Clear Register     */
+} lpc23xx_i2c_t;
+
+/* I2C Control Set Register */
+#define I2CONSET_AA             0x00000004  /**< Assert acknowledge */
+#define I2CONSET_SI             0x00000008  /**< Interrupt flag     */
+#define I2CONSET_STO            0x00000010  /**< STOP flag          */
+#define I2CONSET_STA            0x00000020  /**< START flag         */
+#define I2CONSET_I2EN           0x00000040  /**< Interface enable   */
+
+/* I2C Control clear Register */
+#define I2CONCLR_AAC            0x00000004  /**< clear Assert ACK   */
+#define I2CONCLR_SIC            0x00000008  /**< clear Interrupt    */
+#define I2CONCLR_STAC           0x00000020  /**< clear START flag   */
+#define I2CONCLR_I2ENC          0x00000040  /**< Interface disable  */
+
 /* I2C Interface 0 */
 #define I2C0_BASE_ADDR      0xE001C000
+#define I2C0           ((lpc23xx_i2c_t *)I2C0_BASE_ADDR)
 #define I20CONSET      (*(volatile unsigned long *)(I2C0_BASE_ADDR + 0x00))
 #define I20STAT        (*(volatile unsigned long *)(I2C0_BASE_ADDR + 0x04))
 #define I20DAT         (*(volatile unsigned long *)(I2C0_BASE_ADDR + 0x08))
@@ -783,6 +810,7 @@ typedef struct {
 
 /* I2C Interface 1 */
 #define I2C1_BASE_ADDR      0xE005C000
+#define I2C1           ((lpc23xx_i2c_t *)I2C1_BASE_ADDR)
 #define I21CONSET      (*(volatile unsigned long *)(I2C1_BASE_ADDR + 0x00))
 #define I21STAT        (*(volatile unsigned long *)(I2C1_BASE_ADDR + 0x04))
 #define I21DAT         (*(volatile unsigned long *)(I2C1_BASE_ADDR + 0x08))
@@ -793,6 +821,7 @@ typedef struct {
 
 /* I2C Interface 2 */
 #define I2C2_BASE_ADDR      0xE0080000
+#define I2C2           ((lpc23xx_i2c_t *)I2C2_BASE_ADDR)
 #define I22CONSET      (*(volatile unsigned long *)(I2C2_BASE_ADDR + 0x00))
 #define I22STAT        (*(volatile unsigned long *)(I2C2_BASE_ADDR + 0x04))
 #define I22DAT         (*(volatile unsigned long *)(I2C2_BASE_ADDR + 0x08))