shao ziyang
mbed library sources
Dependents: frdm_kl05z_gpio_test
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Diff: targets/hal/TARGET_STM/TARGET_DISCO_F303VC/i2c_api.c
- Revision:
- 157:90e3acc479a2
- Child:
- 227:7bd0639b8911
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_STM/TARGET_DISCO_F303VC/i2c_api.c Fri Apr 11 17:15:06 2014 +0100
@@ -0,0 +1,357 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2014, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *******************************************************************************
+ */
+#include "i2c_api.h"
+
+#if DEVICE_I2C
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "error.h"
+
+/* Timeout values for flags and events waiting loops. These timeouts are
+ not based on accurate values, they just guarantee that the application will
+ not remain stuck if the I2C communication is corrupted. */
+#define FLAG_TIMEOUT ((int)0x1000)
+#define LONG_TIMEOUT ((int)0x8000)
+
+static const PinMap PinMap_I2C_SDA[] = {
+ {PA_10, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
+ {PA_14, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
+ {PB_5, I2C_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_8)},
+ {PB_7, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
+ {PB_9, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
+ {PC_9, I2C_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_3)},
+ {PF_0, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
+ {NC, NC, 0}
+};
+
+static const PinMap PinMap_I2C_SCL[] = {
+ {PA_8, I2C_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_3)},
+ {PA_9, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
+ {PA_15, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
+ {PB_6, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
+ {PB_8, I2C_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
+ {PF_1, I2C_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_OD, GPIO_PuPd_UP, GPIO_AF_4)},
+ {NC, NC, 0}
+};
+
+void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
+ // Determine the I2C to use
+ I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
+ I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
+
+ obj->i2c = (I2CName)pinmap_merge(i2c_sda, i2c_scl);
+
+ if (obj->i2c == (I2CName)NC) {
+ error("I2C pin mapping failed");
+ }
+
+ // Enable I2C clock
+ if (obj->i2c == I2C_1) {
+ RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
+ }
+ if (obj->i2c == I2C_2) {
+ RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
+ }
+ if (obj->i2c == I2C_3) {
+ RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C3, ENABLE);
+ }
+
+ // Configure I2C pins
+ pinmap_pinout(scl, PinMap_I2C_SCL);
+ pin_mode(scl, OpenDrain);
+ pinmap_pinout(sda, PinMap_I2C_SDA);
+ pin_mode(sda, OpenDrain);
+
+ // Reset to clear pending flags if any
+ i2c_reset(obj);
+
+ // I2C configuration
+ i2c_frequency(obj, 100000); // 100 kHz per default
+}
+
+void i2c_frequency(i2c_t *obj, int hz) {
+ I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+ I2C_InitTypeDef I2C_InitStructure;
+ uint32_t tim;
+
+ // Disable the Fast Mode Plus capability
+ RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // Enable SYSCFG clock
+ SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, DISABLE);
+ SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, DISABLE);
+
+ /*
+ Values calculated with I2C_Timing_Configuration_V1.0.1.xls file (see AN4235)
+ * Standard mode (up to 100 kHz)
+ * Fast Mode (up to 400 kHz)
+ * Fast Mode Plus (up to 1 MHz)
+ Below values obtained with:
+ - I2C clock source = 8 MHz (HSI clock per default)
+ - Analog filter delay = ON
+ - Digital filter coefficient = 0
+ - Rise time = 100 ns
+ - Fall time = 10ns
+ */
+ switch (hz) {
+ case 100000:
+ tim = 0x00201D2B; // Standard mode
+ break;
+ case 200000:
+ tim = 0x0010021E; // Fast Mode
+ break;
+ case 400000:
+ tim = 0x0010020A; // Fast Mode
+ break;
+ case 1000000:
+ tim = 0x00100001; // Fast Mode Plus
+ // Enable the Fast Mode Plus capability
+ if (obj->i2c == I2C_1) {
+ SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C1, ENABLE);
+ }
+ if (obj->i2c == I2C_2) {
+ SYSCFG_I2CFastModePlusConfig(SYSCFG_I2CFastModePlus_I2C2, ENABLE);
+ }
+ break;
+ default:
+ error("Only 100kHz, 200kHz, 400kHz and 1MHz I2C frequencies are supported.");
+ break;
+ }
+
+ // I2C configuration
+ I2C_DeInit(i2c);
+ I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
+ I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
+ I2C_InitStructure.I2C_DigitalFilter = 0x00;
+ I2C_InitStructure.I2C_OwnAddress1 = 0x00;
+ I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
+ I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
+ I2C_InitStructure.I2C_Timing = tim;
+ I2C_Init(i2c, &I2C_InitStructure);
+
+ I2C_Cmd(i2c, ENABLE);
+}
+
+inline int i2c_start(i2c_t *obj) {
+ I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+ int timeout;
+
+ // Test BUSY Flag
+ timeout = LONG_TIMEOUT;
+ while (I2C_GetFlagStatus(i2c, I2C_ISR_BUSY) != RESET) {
+ timeout--;
+ if (timeout == 0) {
+ return 0;
+ }
+ }
+
+ I2C_GenerateSTART(i2c, ENABLE);
+
+ return 0;
+}
+
+inline int i2c_stop(i2c_t *obj) {
+ I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+
+ I2C_GenerateSTOP(i2c, ENABLE);
+
+ return 0;
+}
+
+int i2c_read(i2c_t *obj, int address, char *data, int length, int stop) {
+ I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+ int count;
+ int value;
+
+ if (length == 0) return 0;
+
+ // Configure slave address, nbytes, reload, end mode and start or stop generation
+ I2C_TransferHandling(i2c, address, length, I2C_AutoEnd_Mode, I2C_Generate_Start_Read);
+
+ // Read all bytes
+ for (count = 0; count < length; count++) {
+ value = i2c_byte_read(obj, 0);
+ data[count] = (char)value;
+ }
+
+ return length;
+}
+
+int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) {
+ I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+ //int timeout;
+ int count;
+
+ if (length == 0) return 0;
+
+ // [TODO] The stop is always sent even with I2C_SoftEnd_Mode. To be corrected.
+
+ // Configure slave address, nbytes, reload, end mode and start or stop generation
+ //if (stop) {
+ I2C_TransferHandling(i2c, address, length, I2C_AutoEnd_Mode, I2C_Generate_Start_Write);
+ //}
+ //else {
+ // I2C_TransferHandling(i2c, address, length, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
+ //}
+
+ // Write all bytes
+ for (count = 0; count < length; count++) {
+ if (i2c_byte_write(obj, data[count]) != 1) {
+ i2c_stop(obj);
+ return 0;
+ }
+ }
+
+ /*
+ if (stop) {
+ // Wait until STOPF flag is set
+ timeout = LONG_TIMEOUT;
+ while (I2C_GetFlagStatus(i2c, I2C_ISR_STOPF) == RESET) {
+ timeout--;
+ if (timeout == 0) {
+ return 0;
+ }
+ }
+ // Clear STOPF flag
+ I2C_ClearFlag(i2c, I2C_ICR_STOPCF);
+ }
+ */
+
+ return count;
+}
+
+int i2c_byte_read(i2c_t *obj, int last) {
+ I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+ uint8_t data;
+ int timeout;
+
+ // Wait until the byte is received
+ timeout = FLAG_TIMEOUT;
+ while (I2C_GetFlagStatus(i2c, I2C_ISR_RXNE) == RESET) {
+ timeout--;
+ if (timeout == 0) {
+ return 0;
+ }
+ }
+
+ data = I2C_ReceiveData(i2c);
+
+ return (int)data;
+}
+
+int i2c_byte_write(i2c_t *obj, int data) {
+ I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+ int timeout;
+
+ // Wait until the previous byte is transmitted
+ timeout = FLAG_TIMEOUT;
+ while (I2C_GetFlagStatus(i2c, I2C_ISR_TXIS) == RESET) {
+ timeout--;
+ if (timeout == 0) {
+ return 0;
+ }
+ }
+
+ I2C_SendData(i2c, (uint8_t)data);
+
+ return 1;
+}
+
+void i2c_reset(i2c_t *obj) {
+ if (obj->i2c == I2C_1) {
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
+ }
+ if (obj->i2c == I2C_2) {
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
+ }
+ if (obj->i2c == I2C_3) {
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C3, DISABLE);
+ }
+}
+
+#if DEVICE_I2CSLAVE
+
+void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask) {
+ I2C_TypeDef *i2c = (I2C_TypeDef *)(obj->i2c);
+ uint16_t tmpreg;
+
+ // Get the old register value
+ tmpreg = i2c->OAR1;
+ // Reset address bits
+ tmpreg &= 0xFC00;
+ // Set new address
+ tmpreg |= (uint16_t)((uint16_t)address & (uint16_t)0x00FE); // 7-bits
+ // Store the new register value
+ i2c->OAR1 = tmpreg;
+}
+
+void i2c_slave_mode(i2c_t *obj, int enable_slave) {
+ // Nothing to do
+}
+
+// See I2CSlave.h
+#define NoData 0 // the slave has not been addressed
+#define ReadAddressed 1 // the master has requested a read from this slave (slave = transmitter)
+#define WriteGeneral 2 // the master is writing to all slave
+#define WriteAddressed 3 // the master is writing to this slave (slave = receiver)
+
+int i2c_slave_receive(i2c_t *obj) {
+ // TO BE DONE
+ return (0);
+}
+
+int i2c_slave_read(i2c_t *obj, char *data, int length) {
+ int count = 0;
+
+ // Read all bytes
+ for (count = 0; count < length; count++) {
+ data[count] = i2c_byte_read(obj, 0);
+ }
+
+ return count;
+}
+
+int i2c_slave_write(i2c_t *obj, const char *data, int length) {
+ int count = 0;
+
+ // Write all bytes
+ for (count = 0; count < length; count++) {
+ i2c_byte_write(obj, data[count]);
+ }
+
+ return count;
+}
+
+
+#endif // DEVICE_I2CSLAVE
+
+#endif // DEVICE_I2C