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mbed library sources. Supersedes mbed-src.
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Diff: targets/TARGET_NUVOTON/TARGET_NUC472/i2c_api.c
- Revision:
- 149:156823d33999
- Child:
- 153:fa9ff456f731
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_NUVOTON/TARGET_NUC472/i2c_api.c Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,1048 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2015-2016 Nuvoton
+ *
+ * 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"
+
+#if DEVICE_I2C
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "PeripheralPins.h"
+#include "nu_modutil.h"
+#include "nu_miscutil.h"
+#include "nu_bitutil.h"
+#include "critical.h"
+
+#define NU_I2C_DEBUG 0
+
+#if NU_I2C_DEBUG
+struct i2c_s MY_I2C;
+struct i2c_s MY_I2C_2;
+char MY_I2C_STATUS[64];
+int MY_I2C_STATUS_POS = 0;
+uint32_t MY_I2C_TIMEOUT;
+uint32_t MY_I2C_ELAPSED;
+uint32_t MY_I2C_T1;
+uint32_t MY_I2C_T2;
+#endif
+
+struct nu_i2c_var {
+ i2c_t * obj;
+ void (*vec)(void);
+};
+
+static void i2c0_vec(void);
+static void i2c1_vec(void);
+static void i2c2_vec(void);
+static void i2c3_vec(void);
+static void i2c4_vec(void);
+static void i2c_irq(i2c_t *obj);
+static void i2c_fsm_reset(i2c_t *obj, uint32_t i2c_ctl);
+
+static struct nu_i2c_var i2c0_var = {
+ .obj = NULL,
+ .vec = i2c0_vec,
+};
+static struct nu_i2c_var i2c1_var = {
+ .obj = NULL,
+ .vec = i2c1_vec,
+};
+static struct nu_i2c_var i2c2_var = {
+ .obj = NULL,
+ .vec = i2c2_vec,
+};
+static struct nu_i2c_var i2c3_var = {
+ .obj = NULL,
+ .vec = i2c3_vec,
+};
+static struct nu_i2c_var i2c4_var = {
+ .obj = NULL,
+ .vec = i2c4_vec,
+};
+
+static uint32_t i2c_modinit_mask = 0;
+
+static const struct nu_modinit_s i2c_modinit_tab[] = {
+ {I2C_0, I2C0_MODULE, 0, 0, I2C0_RST, I2C0_IRQn, &i2c0_var},
+ {I2C_1, I2C1_MODULE, 0, 0, I2C1_RST, I2C1_IRQn, &i2c1_var},
+ {I2C_2, I2C2_MODULE, 0, 0, I2C2_RST, I2C2_IRQn, &i2c2_var},
+ {I2C_3, I2C3_MODULE, 0, 0, I2C3_RST, I2C3_IRQn, &i2c3_var},
+ {I2C_4, I2C4_MODULE, 0, 0, I2C4_RST, I2C4_IRQn, &i2c4_var},
+
+ {NC, 0, 0, 0, 0, (IRQn_Type) 0, NULL}
+};
+
+static int i2c_do_tran(i2c_t *obj, char *buf, int length, int read, int naklastdata);
+static int i2c_do_write(i2c_t *obj, char data, int naklastdata);
+static int i2c_do_read(i2c_t *obj, char *data, int naklastdata);
+static int i2c_do_trsn(i2c_t *obj, uint32_t i2c_ctl, int sync);
+#define NU_I2C_TIMEOUT_STAT_INT 500000
+#define NU_I2C_TIMEOUT_STOP 500000
+static int i2c_poll_status_timeout(i2c_t *obj, int (*is_status)(i2c_t *obj), uint32_t timeout);
+static int i2c_poll_tran_heatbeat_timeout(i2c_t *obj, uint32_t timeout);
+//static int i2c_is_stat_int(i2c_t *obj);
+//static int i2c_is_stop_det(i2c_t *obj);
+static int i2c_is_trsn_done(i2c_t *obj);
+static int i2c_is_tran_started(i2c_t *obj);
+static int i2c_addr2data(int address, int read);
+#if DEVICE_I2CSLAVE
+// Convert mbed address to BSP address.
+static int i2c_addr2bspaddr(int address);
+#endif // #if DEVICE_I2CSLAVE
+static void i2c_enable_int(i2c_t *obj);
+static void i2c_disable_int(i2c_t *obj);
+static int i2c_set_int(i2c_t *obj, int inten);
+
+#if DEVICE_I2C_ASYNCH
+static void i2c_buffer_set(i2c_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length);
+static void i2c_enable_vector_interrupt(i2c_t *obj, uint32_t handler, int enable);
+static void i2c_rollback_vector_interrupt(i2c_t *obj);
+#endif
+
+#define TRANCTRL_STARTED (1)
+#define TRANCTRL_NAKLASTDATA (1 << 1)
+
+uint32_t us_ticker_read(void);
+
+void i2c_init(i2c_t *obj, PinName sda, PinName scl)
+{
+ uint32_t i2c_sda = pinmap_peripheral(sda, PinMap_I2C_SDA);
+ uint32_t i2c_scl = pinmap_peripheral(scl, PinMap_I2C_SCL);
+ obj->i2c.i2c = (I2CName) pinmap_merge(i2c_sda, i2c_scl);
+ MBED_ASSERT((int)obj->i2c.i2c != NC);
+
+ const struct nu_modinit_s *modinit = get_modinit(obj->i2c.i2c, i2c_modinit_tab);
+ MBED_ASSERT(modinit != NULL);
+ MBED_ASSERT(modinit->modname == obj->i2c.i2c);
+
+ // Reset this module
+ SYS_ResetModule(modinit->rsetidx);
+
+ // Enable IP clock
+ CLK_EnableModuleClock(modinit->clkidx);
+
+ pinmap_pinout(sda, PinMap_I2C_SDA);
+ pinmap_pinout(scl, PinMap_I2C_SCL);
+
+#if DEVICE_I2C_ASYNCH
+ obj->i2c.dma_usage = DMA_USAGE_NEVER;
+ obj->i2c.event = 0;
+ obj->i2c.stop = 0;
+ obj->i2c.address = 0;
+#endif
+
+ // NOTE: Setting I2C bus clock to 100 KHz is required. See I2C::I2C in common/I2C.cpp.
+ I2C_Open((I2C_T *) NU_MODBASE(obj->i2c.i2c), 100000);
+ // NOTE: INTEN bit and FSM control bits (STA, STO, SI, AA) are packed in one register CTL. We cannot control interrupt through
+ // INTEN bit without impacting FSM control bits. Use NVIC_EnableIRQ/NVIC_DisableIRQ instead for interrupt control.
+ I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
+ i2c_base->CTL |= (I2C_CTL_INTEN_Msk | I2C_CTL_I2CEN_Msk);
+
+ // Enable sync-moce vector interrupt.
+ struct nu_i2c_var *var = (struct nu_i2c_var *) modinit->var;
+ var->obj = obj;
+ obj->i2c.tran_ctrl = 0;
+ obj->i2c.stop = 0;
+ i2c_enable_vector_interrupt(obj, (uint32_t) var->vec, 1);
+
+ // Mark this module to be inited.
+ int i = modinit - i2c_modinit_tab;
+ i2c_modinit_mask |= 1 << i;
+}
+
+int i2c_start(i2c_t *obj)
+{
+ return i2c_do_trsn(obj, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk, 1);
+}
+
+int i2c_stop(i2c_t *obj)
+{
+ return i2c_do_trsn(obj, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk, 1);
+}
+
+void i2c_frequency(i2c_t *obj, int hz)
+{
+ I2C_SetBusClockFreq((I2C_T *) NU_MODBASE(obj->i2c.i2c), hz);
+}
+
+int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
+{
+ if (i2c_start(obj)) {
+ i2c_stop(obj);
+ return I2C_ERROR_BUS_BUSY;
+ }
+
+ if (i2c_do_write(obj, i2c_addr2data(address, 1), 0)) {
+ i2c_stop(obj);
+ return I2C_ERROR_NO_SLAVE;
+ }
+
+ // Read in bytes
+ length = i2c_do_tran(obj, data, length, 1, 1);
+
+ // If not repeated start, send stop.
+ if (stop) {
+ i2c_stop(obj);
+ }
+
+ return length;
+}
+
+int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
+{
+ if (i2c_start(obj)) {
+ i2c_stop(obj);
+ return I2C_ERROR_BUS_BUSY;
+ }
+
+ if (i2c_do_write(obj, i2c_addr2data(address, 0), 0)) {
+ i2c_stop(obj);
+ return I2C_ERROR_NO_SLAVE;
+ }
+
+ // Write out bytes
+ length = i2c_do_tran(obj, (char *) data, length, 0, 1);
+
+ if (stop) {
+ i2c_stop(obj);
+ }
+
+ return length;
+}
+
+void i2c_reset(i2c_t *obj)
+{
+ i2c_stop(obj);
+}
+
+int i2c_byte_read(i2c_t *obj, int last)
+{
+ char data = 0;
+
+ i2c_do_read(obj, &data, last);
+ return data;
+}
+
+int i2c_byte_write(i2c_t *obj, int data)
+{
+ return i2c_do_write(obj, (data & 0xFF), 0);
+}
+
+#if DEVICE_I2CSLAVE
+
+// 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)
+
+void i2c_slave_mode(i2c_t *obj, int enable_slave)
+{
+ I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
+
+ i2c_disable_int(obj);
+
+ obj->i2c.slaveaddr_state = NoData;
+
+ // Switch to not addressed mode
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
+
+ i2c_enable_int(obj);
+}
+
+int i2c_slave_receive(i2c_t *obj)
+{
+ int slaveaddr_state;
+
+ i2c_disable_int(obj);
+ slaveaddr_state = obj->i2c.slaveaddr_state;
+ i2c_enable_int(obj);
+
+ return slaveaddr_state;
+}
+
+int i2c_slave_read(i2c_t *obj, char *data, int length)
+{
+ return i2c_do_tran(obj, data, length, 1, 1);
+}
+
+int i2c_slave_write(i2c_t *obj, const char *data, int length)
+{
+ return i2c_do_tran(obj, (char *) data, length, 0, 1);
+}
+
+void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask)
+{
+ I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
+
+ i2c_disable_int(obj);
+
+ I2C_SetSlaveAddr(i2c_base, 0, i2c_addr2bspaddr(address), I2C_GCMODE_ENABLE);
+
+ i2c_enable_int(obj);
+}
+
+static int i2c_addr2bspaddr(int address)
+{
+ return (address >> 1);
+}
+
+#endif // #if DEVICE_I2CSLAVE
+
+static void i2c_enable_int(i2c_t *obj)
+{
+ const struct nu_modinit_s *modinit = get_modinit(obj->i2c.i2c, i2c_modinit_tab);
+
+ core_util_critical_section_enter();
+
+ // Enable I2C interrupt
+ NVIC_EnableIRQ(modinit->irq_n);
+ obj->i2c.inten = 1;
+
+ core_util_critical_section_exit();
+}
+
+static void i2c_disable_int(i2c_t *obj)
+{
+ const struct nu_modinit_s *modinit = get_modinit(obj->i2c.i2c, i2c_modinit_tab);
+
+ core_util_critical_section_enter();
+
+ // Disable I2C interrupt
+ NVIC_DisableIRQ(modinit->irq_n);
+ obj->i2c.inten = 0;
+
+ core_util_critical_section_exit();
+}
+
+static int i2c_set_int(i2c_t *obj, int inten)
+{
+ int inten_back;
+
+ core_util_critical_section_enter();
+
+ inten_back = obj->i2c.inten;
+
+ core_util_critical_section_exit();
+
+ if (inten) {
+ i2c_enable_int(obj);
+ }
+ else {
+ i2c_disable_int(obj);
+ }
+
+ return inten_back;
+}
+
+int i2c_allow_powerdown(void)
+{
+ uint32_t modinit_mask = i2c_modinit_mask;
+ while (modinit_mask) {
+ int i2c_idx = nu_ctz(modinit_mask);
+ const struct nu_modinit_s *modinit = i2c_modinit_tab + i2c_idx;
+ struct nu_i2c_var *var = (struct nu_i2c_var *) modinit->var;
+ if (var->obj) {
+ // Disallow entering power-down mode if I2C transfer is enabled.
+ if (i2c_active(var->obj)) {
+ return 0;
+ }
+ }
+ modinit_mask &= ~(1 << i2c_idx);
+ }
+
+ return 1;
+}
+
+static int i2c_do_tran(i2c_t *obj, char *buf, int length, int read, int naklastdata)
+{
+ int tran_len = 0;
+
+ i2c_disable_int(obj);
+ obj->i2c.tran_ctrl = naklastdata ? (TRANCTRL_STARTED | TRANCTRL_NAKLASTDATA) : TRANCTRL_STARTED;
+ obj->i2c.tran_beg = buf;
+ obj->i2c.tran_pos = buf;
+ obj->i2c.tran_end = buf + length;
+ i2c_enable_int(obj);
+
+ if (i2c_poll_tran_heatbeat_timeout(obj, NU_I2C_TIMEOUT_STAT_INT)) {
+#if NU_I2C_DEBUG
+ MY_I2C_2 = obj->i2c;
+ while (1);
+#endif
+ }
+ else {
+ i2c_disable_int(obj);
+ obj->i2c.tran_ctrl = 0;
+ tran_len = obj->i2c.tran_pos - obj->i2c.tran_beg;
+ obj->i2c.tran_beg = NULL;
+ obj->i2c.tran_pos = NULL;
+ obj->i2c.tran_end = NULL;
+ i2c_enable_int(obj);
+ }
+
+ return tran_len;
+}
+
+static int i2c_do_write(i2c_t *obj, char data, int naklastdata)
+{
+ char data_[1];
+ data_[0] = data;
+ return i2c_do_tran(obj, data_, 1, 0, naklastdata) == 1 ? 0 : I2C_ERROR_BUS_BUSY;
+}
+
+static int i2c_do_read(i2c_t *obj, char *data, int naklastdata)
+{
+ return i2c_do_tran(obj, data, 1, 1, naklastdata) == 1 ? 0 : I2C_ERROR_BUS_BUSY;
+}
+
+static int i2c_do_trsn(i2c_t *obj, uint32_t i2c_ctl, int sync)
+{
+ I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
+ int err = 0;
+
+ i2c_disable_int(obj);
+
+ if (i2c_poll_status_timeout(obj, i2c_is_trsn_done, NU_I2C_TIMEOUT_STAT_INT)) {
+ err = I2C_ERROR_BUS_BUSY;
+#if NU_I2C_DEBUG
+ MY_I2C_2 = obj->i2c;
+ while (1);
+#endif
+ }
+ else {
+#if 1
+ // NOTE: Avoid duplicate Start/Stop. Otherwise, we may meet strange error.
+ uint32_t status = I2C_GET_STATUS(i2c_base);
+
+ switch (status) {
+ case 0x08: // Start
+ case 0x10: // Master Repeat Start
+ if (i2c_ctl & I2C_CTL_STA_Msk) {
+ return 0;
+ }
+ else {
+ break;
+ }
+ case 0xF8: // Bus Released
+ if (i2c_ctl & (I2C_CTL_STA_Msk | I2C_CTL_STO_Msk) == I2C_CTL_STO_Msk) {
+ return 0;
+ }
+ else {
+ break;
+ }
+ }
+#endif
+ I2C_SET_CONTROL_REG(i2c_base, i2c_ctl);
+ if (sync && i2c_poll_status_timeout(obj, i2c_is_trsn_done, NU_I2C_TIMEOUT_STAT_INT)) {
+ err = I2C_ERROR_BUS_BUSY;
+#if NU_I2C_DEBUG
+ MY_I2C_2 = obj->i2c;
+ while (1);
+#endif
+ }
+ }
+
+ i2c_enable_int(obj);
+
+ return err;
+}
+
+static int i2c_poll_status_timeout(i2c_t *obj, int (*is_status)(i2c_t *obj), uint32_t timeout)
+{
+ uint32_t t1, t2, elapsed = 0;
+ int status_assert = 0;
+
+ t1 = us_ticker_read();
+ while (1) {
+ status_assert = is_status(obj);
+ if (status_assert) {
+ break;
+ }
+
+ t2 = us_ticker_read();
+ elapsed = (t2 > t1) ? (t2 - t1) : ((uint64_t) t2 + 0xFFFFFFFF - t1 + 1);
+ if (elapsed >= timeout) {
+#if NU_I2C_DEBUG
+ MY_I2C_T1 = t1;
+ MY_I2C_T2 = t2;
+ MY_I2C_ELAPSED = elapsed;
+ MY_I2C_TIMEOUT = timeout;
+ MY_I2C_2 = obj->i2c;
+ while (1);
+#endif
+ break;
+ }
+ }
+
+ return (elapsed >= timeout);
+}
+
+static int i2c_poll_tran_heatbeat_timeout(i2c_t *obj, uint32_t timeout)
+{
+ uint32_t t1, t2, elapsed = 0;
+ int tran_started;
+ char *tran_pos = NULL;
+ char *tran_pos2 = NULL;
+
+ i2c_disable_int(obj);
+ tran_pos = obj->i2c.tran_pos;
+ i2c_enable_int(obj);
+ t1 = us_ticker_read();
+ while (1) {
+ i2c_disable_int(obj);
+ tran_started = i2c_is_tran_started(obj);
+ i2c_enable_int(obj);
+ if (! tran_started) { // Transfer completed or stopped
+ break;
+ }
+
+ i2c_disable_int(obj);
+ tran_pos2 = obj->i2c.tran_pos;
+ i2c_enable_int(obj);
+ t2 = us_ticker_read();
+ if (tran_pos2 != tran_pos) { // Transfer on-going
+ t1 = t2;
+ tran_pos = tran_pos2;
+ continue;
+ }
+
+ elapsed = (t2 > t1) ? (t2 - t1) : ((uint64_t) t2 + 0xFFFFFFFF - t1 + 1);
+ if (elapsed >= timeout) { // Transfer idle
+#if NU_I2C_DEBUG
+ MY_I2C = obj->i2c;
+ MY_I2C_T1 = t1;
+ MY_I2C_T2 = t2;
+ MY_I2C_ELAPSED = elapsed;
+ MY_I2C_TIMEOUT = timeout;
+ MY_I2C_2 = obj->i2c;
+ while (1);
+#endif
+ break;
+ }
+ }
+
+ return (elapsed >= timeout);
+}
+
+#if 0
+static int i2c_is_stat_int(i2c_t *obj)
+{
+ I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
+
+ return !! (i2c_base->CTL & I2C_CTL_SI_Msk);
+}
+
+
+static int i2c_is_stop_det(i2c_t *obj)
+{
+ I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
+
+ return ! (i2c_base->CTL & I2C_CTL_STO_Msk);
+}
+#endif
+
+static int i2c_is_trsn_done(i2c_t *obj)
+{
+ I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
+ int i2c_int;
+ uint32_t status;
+ int inten_back;
+
+ inten_back = i2c_set_int(obj, 0);
+ i2c_int = !! (i2c_base->CTL & I2C_CTL_SI_Msk);
+ status = I2C_GET_STATUS(i2c_base);
+ i2c_set_int(obj, inten_back);
+
+ return (i2c_int || status == 0xF8);
+}
+
+static int i2c_is_tran_started(i2c_t *obj)
+{
+ int started;
+ int inten_back;
+
+ inten_back = i2c_set_int(obj, 0);
+ started = !! (obj->i2c.tran_ctrl & TRANCTRL_STARTED);
+ i2c_set_int(obj, inten_back);
+
+ return started;
+}
+
+static int i2c_addr2data(int address, int read)
+{
+ return read ? (address | 1) : (address & 0xFE);
+}
+
+static void i2c0_vec(void)
+{
+ i2c_irq(i2c0_var.obj);
+}
+static void i2c1_vec(void)
+{
+ i2c_irq(i2c1_var.obj);
+}
+static void i2c2_vec(void)
+{
+ i2c_irq(i2c2_var.obj);
+}
+static void i2c3_vec(void)
+{
+ i2c_irq(i2c3_var.obj);
+}
+static void i2c4_vec(void)
+{
+ i2c_irq(i2c4_var.obj);
+}
+
+static void i2c_irq(i2c_t *obj)
+{
+ I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
+ uint32_t status;
+
+ if (I2C_GET_TIMEOUT_FLAG(i2c_base)) {
+ I2C_ClearTimeoutFlag(i2c_base);
+ return;
+ }
+
+ status = I2C_GET_STATUS(i2c_base);
+#if NU_I2C_DEBUG
+ if (MY_I2C_STATUS_POS < (sizeof (MY_I2C_STATUS) / sizeof (MY_I2C_STATUS[0]))) {
+ MY_I2C_STATUS[MY_I2C_STATUS_POS ++] = status;
+ }
+ else {
+ memset(MY_I2C_STATUS, 0x00, sizeof (MY_I2C_STATUS));
+ MY_I2C_STATUS_POS = 0;
+ }
+#endif
+
+ switch (status) {
+ // Master Transmit
+ case 0x28: // Master Transmit Data ACK
+ case 0x18: // Master Transmit Address ACK
+ case 0x08: // Start
+ case 0x10: // Master Repeat Start
+ if ((obj->i2c.tran_ctrl & TRANCTRL_STARTED) && obj->i2c.tran_pos) {
+ if (obj->i2c.tran_pos < obj->i2c.tran_end) {
+ I2C_SET_DATA(i2c_base, *obj->i2c.tran_pos ++);
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
+ }
+ else {
+ if (status == 0x18) {
+ obj->i2c.tran_ctrl &= ~TRANCTRL_STARTED;
+ i2c_disable_int(obj);
+ break;
+ }
+ // Go Master Repeat Start
+ i2c_fsm_reset(obj, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
+ }
+ }
+ else {
+ i2c_disable_int(obj);
+ }
+ break;
+ case 0x30: // Master Transmit Data NACK
+ case 0x20: // Master Transmit Address NACK
+ // Go Master Repeat Start
+ i2c_fsm_reset(obj, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
+ break;
+ case 0x38: // Master Arbitration Lost
+ i2c_fsm_reset(obj, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
+ break;
+
+ case 0x48: // Master Receive Address NACK
+ // Go Master Stop.
+ // Go Master Repeat Start
+ i2c_fsm_reset(obj, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
+ break;
+ case 0x40: // Master Receive Address ACK
+ case 0x50: // Master Receive Data ACK
+ case 0x58: // Master Receive Data NACK
+ if ((obj->i2c.tran_ctrl & TRANCTRL_STARTED) && obj->i2c.tran_pos) {
+ if (obj->i2c.tran_pos < obj->i2c.tran_end) {
+ if (status == 0x50 || status == 0x58) {
+ *obj->i2c.tran_pos ++ = I2C_GET_DATA(i2c_base);
+ }
+
+ if (status == 0x58) {
+#if NU_I2C_DEBUG
+ if (obj->i2c.tran_pos != obj->i2c.tran_end) {
+ MY_I2C = obj->i2c;
+ while (1);
+ }
+#endif
+ // Go Master Repeat Start
+ i2c_fsm_reset(obj, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
+ }
+ else {
+ uint32_t i2c_ctl = I2C_CTL_SI_Msk | I2C_CTL_AA_Msk;
+ if ((obj->i2c.tran_end - obj->i2c.tran_pos) == 1 &&
+ obj->i2c.tran_ctrl & TRANCTRL_NAKLASTDATA) {
+ // Last data
+ i2c_ctl &= ~I2C_CTL_AA_Msk;
+ }
+ I2C_SET_CONTROL_REG(i2c_base, i2c_ctl);
+ }
+ }
+ else {
+ obj->i2c.tran_ctrl &= ~TRANCTRL_STARTED;
+ i2c_disable_int(obj);
+ break;
+ }
+ }
+ else {
+ i2c_disable_int(obj);
+ }
+ break;
+
+ //case 0x00: // Bus error
+
+ // Slave Transmit
+ case 0xB8: // Slave Transmit Data ACK
+ case 0xA8: // Slave Transmit Address ACK
+ case 0xB0: // Slave Transmit Arbitration Lost
+ if ((obj->i2c.tran_ctrl & TRANCTRL_STARTED) && obj->i2c.tran_pos) {
+ if (obj->i2c.tran_pos < obj->i2c.tran_end) {
+ uint32_t i2c_ctl = I2C_CTL_SI_Msk | I2C_CTL_AA_Msk;
+
+ I2C_SET_DATA(i2c_base, *obj->i2c.tran_pos ++);
+ if (obj->i2c.tran_pos == obj->i2c.tran_end &&
+ obj->i2c.tran_ctrl & TRANCTRL_NAKLASTDATA) {
+ // Last data
+ i2c_ctl &= ~I2C_CTL_AA_Msk;
+ }
+ I2C_SET_CONTROL_REG(i2c_base, i2c_ctl);
+ }
+ else {
+ obj->i2c.tran_ctrl &= ~TRANCTRL_STARTED;
+ i2c_disable_int(obj);
+ break;
+ }
+ }
+ else {
+ i2c_disable_int(obj);
+ }
+ obj->i2c.slaveaddr_state = ReadAddressed;
+ break;
+ //case 0xA0: // Slave Transmit Repeat Start or Stop
+ case 0xC0: // Slave Transmit Data NACK
+ case 0xC8: // Slave Transmit Last Data ACK
+ obj->i2c.slaveaddr_state = NoData;
+ i2c_fsm_reset(obj, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
+ break;
+
+ // Slave Receive
+ case 0x80: // Slave Receive Data ACK
+ case 0x88: // Slave Receive Data NACK
+ case 0x60: // Slave Receive Address ACK
+ case 0x68: // Slave Receive Arbitration Lost
+ obj->i2c.slaveaddr_state = WriteAddressed;
+ if ((obj->i2c.tran_ctrl & TRANCTRL_STARTED) && obj->i2c.tran_pos) {
+ if (obj->i2c.tran_pos < obj->i2c.tran_end) {
+ if (status == 0x80 || status == 0x88) {
+ *obj->i2c.tran_pos ++ = I2C_GET_DATA(i2c_base);
+ }
+
+ if (status == 0x88) {
+#if NU_I2C_DEBUG
+ if (obj->i2c.tran_pos != obj->i2c.tran_end) {
+ MY_I2C = obj->i2c;
+ while (1);
+ }
+#endif
+ obj->i2c.slaveaddr_state = NoData;
+ i2c_fsm_reset(obj, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
+ }
+ else {
+ uint32_t i2c_ctl = I2C_CTL_SI_Msk | I2C_CTL_AA_Msk;
+ if ((obj->i2c.tran_end - obj->i2c.tran_pos) == 1 &&
+ obj->i2c.tran_ctrl & TRANCTRL_NAKLASTDATA) {
+ // Last data
+ i2c_ctl &= ~I2C_CTL_AA_Msk;
+ }
+ I2C_SET_CONTROL_REG(i2c_base, i2c_ctl);
+ }
+ }
+ else {
+ obj->i2c.tran_ctrl &= ~TRANCTRL_STARTED;
+ i2c_disable_int(obj);
+ break;
+ }
+ }
+ else {
+ i2c_disable_int(obj);
+ }
+ break;
+ //case 0xA0: // Slave Receive Repeat Start or Stop
+
+ // GC mode
+ //case 0xA0: // GC mode Repeat Start or Stop
+ case 0x90: // GC mode Data ACK
+ case 0x98: // GC mode Data NACK
+ case 0x70: // GC mode Address ACK
+ case 0x78: // GC mode Arbitration Lost
+ obj->i2c.slaveaddr_state = WriteAddressed;
+ if ((obj->i2c.tran_ctrl & TRANCTRL_STARTED) && obj->i2c.tran_pos) {
+ if (obj->i2c.tran_pos < obj->i2c.tran_end) {
+ if (status == 0x90 || status == 0x98) {
+ *obj->i2c.tran_pos ++ = I2C_GET_DATA(i2c_base);
+ }
+
+ if (status == 0x98) {
+#if NU_I2C_DEBUG
+ if (obj->i2c.tran_pos != obj->i2c.tran_end) {
+ MY_I2C = obj->i2c;
+ while (1);
+ }
+#endif
+ obj->i2c.slaveaddr_state = NoData;
+ i2c_fsm_reset(obj, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
+ }
+ else {
+ uint32_t i2c_ctl = I2C_CTL_SI_Msk | I2C_CTL_AA_Msk;
+ if ((obj->i2c.tran_end - obj->i2c.tran_pos) == 1 &&
+ obj->i2c.tran_ctrl & TRANCTRL_NAKLASTDATA) {
+ // Last data
+ i2c_ctl &= ~I2C_CTL_AA_Msk;
+ }
+ I2C_SET_CONTROL_REG(i2c_base, i2c_ctl);
+ }
+ }
+ else {
+ obj->i2c.tran_ctrl &= ~TRANCTRL_STARTED;
+ i2c_disable_int(obj);
+ break;
+ }
+ }
+ else {
+ i2c_disable_int(obj);
+ }
+ break;
+
+ case 0xF8: // Bus Released
+ break;
+
+ default:
+ i2c_fsm_reset(obj, I2C_CTL_SI_Msk | I2C_CTL_AA_Msk);
+ }
+}
+
+static void i2c_fsm_reset(i2c_t *obj, uint32_t i2c_ctl)
+{
+ I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
+
+ obj->i2c.stop = 0;
+
+ obj->i2c.tran_ctrl = 0;
+
+ I2C_SET_CONTROL_REG(i2c_base, i2c_ctl);
+ obj->i2c.slaveaddr_state = NoData;
+}
+
+
+#if DEVICE_I2C_ASYNCH
+
+void i2c_transfer_asynch(i2c_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length, uint32_t address, uint32_t stop, uint32_t handler, uint32_t event, DMAUsage hint)
+{
+ // NOTE: NUC472 I2C only supports 7-bit slave address. The mbed I2C address passed in is shifted left by 1 bit (7-bit addr << 1).
+ MBED_ASSERT((address & 0xFFFFFF00) == 0);
+
+ // NOTE: First transmit and then receive.
+
+ (void) hint;
+ obj->i2c.dma_usage = DMA_USAGE_NEVER;
+ obj->i2c.stop = stop;
+ obj->i2c.address = address;
+ obj->i2c.event = event;
+ i2c_buffer_set(obj, tx, tx_length, rx, rx_length);
+
+ //I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
+
+ i2c_enable_vector_interrupt(obj, handler, 1);
+ i2c_start(obj);
+}
+
+uint32_t i2c_irq_handler_asynch(i2c_t *obj)
+{
+ int event = 0;
+
+ I2C_T *i2c_base = (I2C_T *) NU_MODBASE(obj->i2c.i2c);
+ uint32_t status = I2C_GET_STATUS(i2c_base);
+ switch (status) {
+ case 0x08: // Start
+ case 0x10: {// Master Repeat Start
+ if (obj->tx_buff.buffer && obj->tx_buff.pos < obj->tx_buff.length) {
+ I2C_SET_DATA(i2c_base, (i2c_addr2data(obj->i2c.address, 0)));
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk);
+ }
+ else if (obj->rx_buff.buffer && obj->rx_buff.pos < obj->rx_buff.length) {
+ I2C_SET_DATA(i2c_base, (i2c_addr2data(obj->i2c.address, 1)));
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk);
+ }
+ else {
+ event = I2C_EVENT_TRANSFER_COMPLETE;
+ if (obj->i2c.stop) {
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
+ }
+ }
+ break;
+ }
+
+ case 0x18: // Master Transmit Address ACK
+ case 0x28: // Master Transmit Data ACK
+ if (obj->tx_buff.buffer && obj->tx_buff.pos < obj->tx_buff.length) {
+ uint8_t *tx = (uint8_t *)obj->tx_buff.buffer;
+ I2C_SET_DATA(i2c_base, tx[obj->tx_buff.pos ++]);
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk);
+ }
+ else if (obj->rx_buff.buffer && obj->rx_buff.pos < obj->rx_buff.length) {
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
+ }
+ else {
+ event = I2C_EVENT_TRANSFER_COMPLETE;
+ if (obj->i2c.stop) {
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
+ }
+ }
+ break;
+
+ case 0x20: // Master Transmit Address NACK
+ event = I2C_EVENT_ERROR_NO_SLAVE;
+ if (obj->i2c.stop) {
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
+ }
+ break;
+
+ case 0x30: // Master Transmit Data NACK
+ if (obj->tx_buff.buffer && obj->tx_buff.pos < obj->tx_buff.length) {
+ event = I2C_EVENT_TRANSFER_EARLY_NACK;
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
+ }
+ else if (obj->rx_buff.buffer && obj->rx_buff.pos < obj->rx_buff.length) {
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
+ }
+ else {
+ event = I2C_EVENT_TRANSFER_COMPLETE;
+ if (obj->i2c.stop) {
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
+ }
+ }
+ break;
+
+ case 0x38: // Master Arbitration Lost
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk); // Enter not addressed SLV mode
+ event = I2C_EVENT_ERROR;
+ break;
+
+ case 0x50: // Master Receive Data ACK
+ if (obj->rx_buff.buffer && obj->rx_buff.pos < obj->rx_buff.length) {
+ uint8_t *rx = (uint8_t *) obj->rx_buff.buffer;
+ rx[obj->rx_buff.pos ++] = I2C_GET_DATA(((I2C_T *) NU_MODBASE(obj->i2c.i2c)));
+ }
+ case 0x40: // Master Receive Address ACK
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_SI_Msk | ((obj->rx_buff.pos != obj->rx_buff.length - 1) ? I2C_CTL_AA_Msk : 0));
+ break;
+
+ case 0x48: // Master Receive Address NACK
+ event = I2C_EVENT_ERROR_NO_SLAVE;
+ if (obj->i2c.stop) {
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
+ }
+ break;
+
+ case 0x58: // Master Receive Data NACK
+ if (obj->rx_buff.buffer && obj->rx_buff.pos < obj->rx_buff.length) {
+ uint8_t *rx = (uint8_t *) obj->rx_buff.buffer;
+ rx[obj->rx_buff.pos ++] = I2C_GET_DATA(((I2C_T *) NU_MODBASE(obj->i2c.i2c)));
+ }
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STA_Msk | I2C_CTL_SI_Msk);
+ break;
+
+ case 0x00: // Bus error
+ event = I2C_EVENT_ERROR;
+ i2c_reset(obj);
+ break;
+
+ default:
+ event = I2C_EVENT_ERROR;
+ if (obj->i2c.stop) {
+ I2C_SET_CONTROL_REG(i2c_base, I2C_CTL_STO_Msk | I2C_CTL_SI_Msk);
+ }
+ }
+
+ if (event) {
+ i2c_rollback_vector_interrupt(obj);
+ }
+
+ return (event & obj->i2c.event);
+}
+
+uint8_t i2c_active(i2c_t *obj)
+{
+ const struct nu_modinit_s *modinit = get_modinit(obj->i2c.i2c, i2c_modinit_tab);
+ MBED_ASSERT(modinit != NULL);
+ MBED_ASSERT(modinit->modname == obj->i2c.i2c);
+
+ // Vector will be changed for async transfer. Use it to judge if async transfer is on-going.
+ uint32_t vec = NVIC_GetVector(modinit->irq_n);
+ struct nu_i2c_var *var = (struct nu_i2c_var *) modinit->var;
+ return (vec && vec != (uint32_t) var->vec);
+}
+
+void i2c_abort_asynch(i2c_t *obj)
+{
+ i2c_rollback_vector_interrupt(obj);
+ i2c_stop(obj);
+}
+
+static void i2c_buffer_set(i2c_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length)
+{
+ obj->tx_buff.buffer = (void *) tx;
+ obj->tx_buff.length = tx_length;
+ obj->tx_buff.pos = 0;
+ obj->rx_buff.buffer = rx;
+ obj->rx_buff.length = rx_length;
+ obj->rx_buff.pos = 0;
+}
+
+static void i2c_enable_vector_interrupt(i2c_t *obj, uint32_t handler, int enable)
+{
+ const struct nu_modinit_s *modinit = get_modinit(obj->i2c.i2c, i2c_modinit_tab);
+ MBED_ASSERT(modinit != NULL);
+ MBED_ASSERT(modinit->modname == obj->i2c.i2c);
+
+ if (enable) {
+ NVIC_SetVector(modinit->irq_n, handler);
+ i2c_enable_int(obj);
+ }
+ else {
+ i2c_disable_int(obj);
+ }
+}
+
+static void i2c_rollback_vector_interrupt(i2c_t *obj)
+{
+ const struct nu_modinit_s *modinit = get_modinit(obj->i2c.i2c, i2c_modinit_tab);
+ MBED_ASSERT(modinit != NULL);
+ MBED_ASSERT(modinit->modname == obj->i2c.i2c);
+
+ struct nu_i2c_var *var = (struct nu_i2c_var *) modinit->var;
+ i2c_enable_vector_interrupt(obj, (uint32_t) var->vec, 1);
+}
+
+#endif
+
+#endif