Diff: targets/TARGET_TOSHIBA/TARGET_TMPM066/i2c_api.c

Revision:

172:7d866c31b3c5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_TOSHIBA/TARGET_TMPM066/i2c_api.c	Thu Aug 31 17:27:04 2017 +0100
@@ -0,0 +1,343 @@
+/* mbed Microcontroller Library
+ * (C)Copyright TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION 2017 All rights reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "i2c_api.h"
+#include "mbed_error.h"
+#include "PeripheralNames.h"
+#include "pinmap.h"
+
+#define I2C_NACK                (0)
+#define I2C_ACK                 (1)
+#define I2C_NO_DATA             (0)
+#define I2C_READ_ADDRESSED      (1)
+#define I2C_WRITE_GENERAL       (2)
+#define I2C_WRITE_ADDRESSED     (3)
+#define SELF_ADDR               (0xE0)
+#define I2C_TIMEOUT             (100000)
+
+static const PinMap PinMap_I2C_SDA[] = {
+    {PC1, I2C_0, PIN_DATA(1, 2)},
+    {PG1, I2C_1, PIN_DATA(1, 2)},
+    {NC,  NC,    0}
+};
+
+static const PinMap PinMap_I2C_SCL[] = {
+    {PC0, I2C_0, PIN_DATA(1, 2)},
+    {PG0, I2C_1, PIN_DATA(1, 2)},
+    {NC,  NC,    0}
+};
+
+void I2C_ClearINTOutput(TSB_I2C_TypeDef * I2Cx);
+// Clock setting structure definition
+typedef struct {
+    uint32_t sck;
+    uint32_t prsck;
+} I2C_clock_setting_t;
+
+static const uint32_t I2C_SCK_DIVIDER_TBL[8] = {20, 24, 32, 48, 80, 144, 272, 528};  // SCK Divider value table
+static uint32_t start_flag = 0;
+I2C_clock_setting_t clk;
+I2C_State status;
+
+static int32_t wait_status(i2c_t *obj)
+{
+    volatile int32_t timeout = I2C_TIMEOUT;
+
+    while (I2C_GetINTI2CStatus(obj->i2c) == DISABLE) {
+        if ((timeout--) == 0) {
+            return (-1);
+        }
+    }
+    return (0);
+}
+
+// Initialize the I2C peripheral. It sets the default parameters for I2C
+void i2c_init(i2c_t *obj, PinName sda, PinName scl)
+{
+    MBED_ASSERT(obj != NULL);
+    I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
+    I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
+    I2CName i2c_name = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
+    MBED_ASSERT((int)i2c_name != NC);
+
+    switch (i2c_name) {
+        case I2C_0:
+            CG_SetFcPeriphA(CG_FC_PERIPH_I2C0, ENABLE);
+            obj->i2c = TSB_I2C0;
+            obj->IRQn = INTI2C0_IRQn;
+            break;
+        case I2C_1:
+            CG_SetFcPeriphB(CG_FC_PERIPH_I2C1, ENABLE);
+            obj->i2c = TSB_I2C1;
+            obj->IRQn = INTI2C1_IRQn;
+            break;
+        default:
+            error("I2C is not available");
+            break;
+    }
+
+    pinmap_pinout(sda, PinMap_I2C_SDA);
+    pin_mode(sda, OpenDrain);
+    pin_mode(sda, PullUp);
+
+    pinmap_pinout(scl, PinMap_I2C_SCL);
+    pin_mode(scl, OpenDrain);
+    pin_mode(scl, PullUp);
+
+    NVIC_DisableIRQ(obj->IRQn);
+
+    i2c_reset(obj);
+    i2c_frequency(obj, 100000);
+}
+
+// Configure the I2C frequency
+void i2c_frequency(i2c_t *obj, int hz)
+{
+    uint64_t sck, tmp_sck;
+    uint64_t prsck, tmp_prsck;
+    uint64_t fscl, tmp_fscl;
+    uint64_t fx;
+
+    SystemCoreClockUpdate();
+
+    if (hz <= 1000000) {
+        sck   = tmp_sck   = 0;
+        prsck = tmp_prsck = 1;
+        fscl  = tmp_fscl  = 0;
+        for (prsck = 1; prsck <= 32; prsck++) {
+            fx = ((uint64_t)SystemCoreClock / prsck);
+            if ((fx < 40000000U) && (fx > 6666666U)) {
+                for (sck = 0; sck <= 7; sck++) {
+                    fscl = (fx / (uint64_t)I2C_SCK_DIVIDER_TBL[sck]);
+                    if ((fscl <= (uint64_t)hz) && (fscl > tmp_fscl)) {
+                        tmp_fscl = fscl;
+                        tmp_sck = sck;
+                        tmp_prsck = (prsck < 32)? prsck: 0;
+                    }
+                }
+            }
+        }
+        clk.sck = (uint32_t)tmp_sck;
+        clk.prsck = (tmp_prsck < 32) ? (uint32_t)(tmp_prsck) : 0;
+    }
+    obj->myi2c.I2CSelfAddr = SELF_ADDR;
+    obj->myi2c.I2CDataLen = I2C_DATA_LEN_8;
+    obj->myi2c.I2CACKState = ENABLE;
+    obj->myi2c.I2CClkDiv = clk.sck;
+    obj->myi2c.PrescalerClkDiv = clk.prsck;
+
+    I2C_Init(obj->i2c, &obj->myi2c);
+    NVIC_DisableIRQ(obj->IRQn);
+}
+
+int i2c_start(i2c_t *obj)
+{
+    start_flag = 1;
+    return 0;
+}
+
+int i2c_stop(i2c_t *obj)
+{
+    I2C_GenerateStop(obj->i2c);
+    return 0;
+}
+
+void i2c_reset(i2c_t *obj)
+{
+    I2C_SWReset(obj->i2c);
+}
+
+int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
+{
+    int32_t result = 0;
+    int32_t count = 0;
+
+    if (length > 0) {
+        start_flag = 1;  // Start Condition
+        if (i2c_byte_write(obj, (int32_t)((uint32_t)address | 1U)) == I2C_ACK) {
+            while (count < length) {
+                int32_t pdata = i2c_byte_read(obj, ((count < (length - 1)) ? 0 : 1));
+                if (pdata < 0) {
+                    break;
+                }
+                data[count++] = (uint8_t)pdata;
+            }
+            result = count;
+        } else {
+            stop = 1;
+            result = I2C_ERROR_NO_SLAVE;
+        }
+
+        if (stop) {  // Stop Condition
+            i2c_stop(obj);
+        }
+    }
+    return (result);
+}
+
+int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)  // Blocking sending data
+{
+    int32_t result = 0;
+    int32_t count = 0;
+
+    start_flag = 1; // Start Condition
+    if (i2c_byte_write(obj, address) == I2C_ACK) {
+        while (count < length) {
+            if (i2c_byte_write(obj, (int32_t)data[count++]) < I2C_ACK) {
+                break;
+            }
+        }
+        result = count;
+    } else {
+        stop = 1;
+        result = I2C_ERROR_NO_SLAVE;
+    }
+
+    if (stop) {  // Stop Condition
+        i2c_stop(obj);
+    }
+    return (result);
+}
+
+int i2c_byte_read(i2c_t *obj, int last)
+{
+    int32_t result;
+
+    I2C_ClearINTOutput(obj->i2c);
+
+    if (last) {
+        I2C_SelectACKoutput(obj->i2c, ENABLE);
+    } else {
+        I2C_SelectACKoutput(obj->i2c, DISABLE);
+    }
+    I2C_SetSendData(obj->i2c, 0x00);
+
+    if (wait_status(obj) < 0) {
+        result = -1;
+    } else {
+        result = (int32_t)I2C_GetReceiveData(obj->i2c);
+    }
+    return (result);
+}
+
+void I2C_Start_Condition(i2c_t *p_obj, uint32_t data)
+{
+    status = I2C_GetState(p_obj->i2c);
+    if (status.Bit.BusState) {
+        I2C_SetRepeatStart(p_obj->i2c, ENABLE);
+    }
+    I2C_SetSendData(p_obj->i2c, (uint32_t)data);
+    I2C_GenerateStart(p_obj->i2c);
+}
+
+int i2c_byte_write(i2c_t *obj, int data)
+{
+    int32_t result;
+
+    I2C_ClearINTOutput(obj->i2c);
+
+    if (start_flag == 1) {
+        I2C_Start_Condition(obj, (uint32_t)data);
+        start_flag = 0;
+    } else {
+        I2C_SetSendData(obj->i2c, (uint32_t)data);
+    }
+
+    if (wait_status(obj) < 0) {
+        return (-1);
+    }
+
+    status = I2C_GetState(obj->i2c);
+    if (!status.Bit.LastRxBit) {
+        result = 1;
+    } else {
+        result = 0;
+    }
+    return (result);
+}
+
+void i2c_slave_mode(i2c_t *obj, int enable_slave)
+{
+    i2c_reset(obj);
+
+    obj->myi2c.I2CDataLen = I2C_DATA_LEN_8;
+    obj->myi2c.I2CACKState = ENABLE;
+    obj->myi2c.I2CClkDiv = clk.sck;
+    obj->myi2c.PrescalerClkDiv = clk.prsck;
+
+    if (enable_slave) {
+        obj->myi2c.I2CSelfAddr = obj->address;
+        I2C_SetINTI2CReq(obj->i2c, ENABLE);
+    } else {
+        obj->myi2c.I2CSelfAddr = SELF_ADDR;
+        NVIC_DisableIRQ(obj->IRQn);
+        I2C_ClearINTOutput(obj->i2c);
+    }
+    I2C_Init(obj->i2c, &obj->myi2c);
+}
+
+int i2c_slave_receive(i2c_t *obj)
+{
+    int32_t result = I2C_NO_DATA;
+
+    if  ((I2C_GetINTI2CStatus(obj->i2c)) && (I2C_GetSlaveAddrMatchState(obj->i2c))) {
+        status = I2C_GetState(obj->i2c);
+        if (!status.Bit.TRx) {
+            result = I2C_WRITE_ADDRESSED;
+        } else {
+            result = I2C_READ_ADDRESSED;
+        }
+    }
+    return (result);
+}
+
+int i2c_slave_read(i2c_t *obj, char *data, int length)
+{
+    int32_t count = 0;
+
+    while (count < length) {
+        int32_t pdata = i2c_byte_read(obj, ((count < (length - 1))? 0: 1));
+        status = I2C_GetState(obj->i2c);
+        if (status.Bit.TRx) {
+            return (count);
+        } else {
+            if (pdata < 0) {
+                break;
+            }
+            data[count++] = (uint8_t)pdata;
+        }
+    }
+    i2c_slave_mode(obj, 1);
+    return (count);
+}
+
+int i2c_slave_write(i2c_t *obj, const char *data, int length)
+{
+    int32_t count = 0;
+
+    while (count < length) {
+        if (i2c_byte_write(obj, (int32_t)data[count++]) < I2C_ACK) {
+            break;
+        }
+    }
+    i2c_slave_mode(obj, 1);
+    return (count);
+}
+
+void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
+{
+    obj->address = address & 0xFE;
+    i2c_slave_mode(obj, 1);
+}