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mbed-os/targets/TARGET_ARM_SSG/TARGET_MPS2/i2c_api.c

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/* mbed Microcontroller Library
* Copyright (c) 2006-2015 ARM Limited
*
* 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 "mbed_error.h"
#include "SMM_MPS2.h"
#include "mbed_wait_api.h"
#include "fpga.h"
// Types
#undef FALSE
#undef TRUE
#define FALSE 0
#define TRUE 1
// TSC I2C controller
#define TSC_I2C_ADDR 0x82
// AACI I2C controller I2C address
#define AAIC_I2C_ADDR 0x96
#define TSC_I2C_CID 0x0811
// TSC I2C controller registers
#define TSC_I2C_CRID 0x00
// TSSPCPSR Clock prescale register
#define TSSPCPSR_DFLT 0x0002 // Clock prescale (use with SCR)
// TSC defaults
#define TSC_XOFF 20 // X offset
#define TSC_YOFF 20 // Y offset
#define TSC_MAXVAL 37000 // 0x0FFF * 10 with TSC to LCD scaling
#define TSC_TSU 15 // Setup delay 600nS min
#define AAIC_TSU 25 // Setup delay 1000nS min
#define SHIELD_TSU 25 // Setup delay 1000nS min
static const PinMap PinMap_I2C_SDA[] = {
{TSC_SDA, I2C_0, 0},
{AUD_SDA, I2C_1, 0},
{SHIELD_0_SDA, I2C_2, 0},
{SHIELD_1_SDA, I2C_3, 0},
{NC , NC , 0}
};
static const PinMap PinMap_I2C_SCL[] = {
{TSC_SCL, I2C_0, 0},
{AUD_SCL, I2C_1, 0},
{SHIELD_0_SCL, I2C_2, 0},
{SHIELD_1_SCL, I2C_3, 0},
{NC , NC, 0}
};
static inline void i2c_send_byte(i2c_t *obj, unsigned char c)
{
int loop;
switch ((int)obj->i2c) {
case I2C_0:
obj->i2c->CONTROLC = SCL;
i2c_delay(TSC_TSU);
for (loop = 0; loop < 8; loop++)
{
if (c & (1 << (7 - loop)))
obj->i2c->CONTROLS = SDA;
else
obj->i2c->CONTROLC = SDA;
i2c_delay(TSC_TSU);
obj->i2c->CONTROLS = SCL;
i2c_delay(TSC_TSU);
obj->i2c->CONTROLC = SCL;
i2c_delay(TSC_TSU);
}
obj->i2c->CONTROLS = SDA;
i2c_delay(TSC_TSU);
break;
case I2C_1:
for (loop = 0; loop < 8; loop++) {
i2c_delay(AAIC_TSU);
obj->i2c->CONTROLC = SCL;
i2c_delay(AAIC_TSU);
if (c & (1 << (7 - loop)))
obj->i2c->CONTROLS = SDA;
else
obj->i2c->CONTROLC = SDA;
i2c_delay(AAIC_TSU);
obj->i2c->CONTROLS = SCL;
i2c_delay(AAIC_TSU);
obj->i2c->CONTROLC = SCL;
}
i2c_delay(AAIC_TSU);
obj->i2c->CONTROLS = SDA;
i2c_delay(AAIC_TSU);
break;
case I2C_2:
case I2C_3:
obj->i2c->CONTROLC = SCL;
i2c_delay(SHIELD_TSU);
for (loop = 0; loop < 8; loop++)
{
if (c & (1 << (7 - loop)))
obj->i2c->CONTROLS = SDA;
else
obj->i2c->CONTROLC = SDA;
i2c_delay(SHIELD_TSU);
obj->i2c->CONTROLS = SCL;
i2c_delay(SHIELD_TSU);
obj->i2c->CONTROLC = SCL;
i2c_delay(SHIELD_TSU);
}
obj->i2c->CONTROLS = SDA;
i2c_delay(SHIELD_TSU);
break;
}
}
static inline unsigned char i2c_receive_byte(i2c_t *obj)
{
int data_receive_byte, loop;
switch ((int)obj->i2c) {
case I2C_0:
obj->i2c->CONTROLS = SDA;
i2c_delay(TSC_TSU);
data_receive_byte = 0;
for (loop = 0; loop < 8; loop++)
{
obj->i2c->CONTROLS = SCL;
i2c_delay(TSC_TSU);
if ((obj->i2c->CONTROL & SDA))
data_receive_byte += (1 << (7 - loop));
obj->i2c->CONTROLC = SCL;
i2c_delay(TSC_TSU);
}
obj->i2c->CONTROLC = SDA;
i2c_delay(TSC_TSU);
break;
case I2C_1:
obj->i2c->CONTROLS = SDA;
data_receive_byte = 0;
for (loop = 0; loop < 8; loop++) {
i2c_delay(AAIC_TSU);
obj->i2c->CONTROLC = SCL;
i2c_delay(AAIC_TSU);
obj->i2c->CONTROLS = SCL | SDA;
i2c_delay(AAIC_TSU);
if ((obj->i2c->CONTROL & SDA))
data_receive_byte += (1 << (7 - loop));
i2c_delay(AAIC_TSU);
obj->i2c->CONTROLC = SCL;
}
i2c_delay(AAIC_TSU);
obj->i2c->CONTROLC = SDA;
i2c_delay(AAIC_TSU);
break;
case I2C_2:
case I2C_3:
obj->i2c->CONTROLS = SDA;
i2c_delay(SHIELD_TSU);
data_receive_byte = 0;
for (loop = 0; loop < 8; loop++)
{
obj->i2c->CONTROLS = SCL;
i2c_delay(SHIELD_TSU);
if ((obj->i2c->CONTROL & SDA))
data_receive_byte += (1 << (7 - loop));
obj->i2c->CONTROLC = SCL;
i2c_delay(SHIELD_TSU);
}
obj->i2c->CONTROLC = SDA;
i2c_delay(SHIELD_TSU);
break;
}
return data_receive_byte;
}
static inline int i2c_receive_ack(i2c_t *obj)
{
int nack;
int delay_value;
switch ((int)obj->i2c) {
case I2C_0: delay_value = TSC_TSU; break;
case I2C_1: delay_value = AAIC_TSU; break;
case I2C_2: delay_value = SHIELD_TSU; break;
case I2C_3: delay_value = SHIELD_TSU; break;
}
i2c_delay(delay_value);
obj->i2c->CONTROLS = SDA;
i2c_delay(delay_value);
obj->i2c->CONTROLC = SCL;
i2c_delay(delay_value);
obj->i2c->CONTROLS = SCL;
i2c_delay(delay_value);
nack = obj->i2c->CONTROL & SDA;
i2c_delay(delay_value);
obj->i2c->CONTROLC = SCL;
i2c_delay(delay_value);
obj->i2c->CONTROLS = SDA;
i2c_delay(delay_value);
if(nack==0)
return 1;
return 0;
}
static inline void i2c_send_nack(i2c_t *obj)
{
int delay_value;
switch ((int)obj->i2c) {
case I2C_0: delay_value = TSC_TSU; break;
case I2C_1: delay_value = AAIC_TSU; break;
case I2C_2: delay_value = SHIELD_TSU; break;
case I2C_3: delay_value = SHIELD_TSU; break;
}
i2c_delay(delay_value);
obj->i2c->CONTROLC = SCL;
i2c_delay(delay_value);
obj->i2c->CONTROLS = SDA;
i2c_delay(delay_value);
obj->i2c->CONTROLS = SCL;
i2c_delay(delay_value);
obj->i2c->CONTROLC = SCL;
i2c_delay(delay_value);
obj->i2c->CONTROLC = SDA;
i2c_delay(delay_value);
}
static inline void i2c_send_ack(i2c_t *obj)
{
int delay_value;
switch ((int)obj->i2c) {
case I2C_0: delay_value = TSC_TSU; break;
case I2C_1: delay_value = AAIC_TSU; break;
case I2C_2: delay_value = SHIELD_TSU; break;
case I2C_3: delay_value = SHIELD_TSU; break;
}
i2c_delay(delay_value);
obj->i2c->CONTROLC = SDA;
i2c_delay(delay_value);
obj->i2c->CONTROLS = SCL;
i2c_delay(delay_value);
obj->i2c->CONTROLC = SCL;
i2c_delay(delay_value);
}
void i2c_init(i2c_t *obj, PinName sda, PinName scl)
{
// determine the SPI to use
I2CName i2c_sda = (I2CName)pinmap_peripheral(sda, PinMap_I2C_SDA);
I2CName i2c_scl = (I2CName)pinmap_peripheral(scl, PinMap_I2C_SCL);
obj->i2c = (MPS2_I2C_TypeDef *)pinmap_merge(i2c_sda, i2c_scl);
if ((int)obj->i2c == NC) {
error("I2C pin mapping failed");
}
pinmap_pinout(sda, PinMap_I2C_SDA);
pinmap_pinout(scl, PinMap_I2C_SCL);
switch ((int)obj->i2c) {
case I2C_2: CMSDK_GPIO0->ALTFUNCSET |= 0x8020; break;
case I2C_3: CMSDK_GPIO1->ALTFUNCSET |= 0x8000;
CMSDK_GPIO2->ALTFUNCSET |= 0x0200; break;
}
}
int i2c_start(i2c_t *obj)
{
int delay_value;
switch ((int)obj->i2c) {
case I2C_0: delay_value = TSC_TSU; break;
case I2C_1: delay_value = AAIC_TSU; break;
case I2C_2: delay_value = SHIELD_TSU; break;
case I2C_3: delay_value = SHIELD_TSU; break;
}
i2c_delay(delay_value);
obj->i2c->CONTROLS = SDA | SCL;
i2c_delay(delay_value);
obj->i2c->CONTROLC = SDA;
i2c_delay(delay_value);
return 0;
}
int i2c_start_tsc(i2c_t *obj)
{
int delay_value;
switch ((int)obj->i2c) {
case I2C_0: delay_value = TSC_TSU; break;
case I2C_1: delay_value = AAIC_TSU; break;
case I2C_2: delay_value = SHIELD_TSU; break;
case I2C_3: delay_value = SHIELD_TSU; break;
}
i2c_delay(delay_value);
obj->i2c->CONTROLC = SDA;
i2c_delay(delay_value);
obj->i2c->CONTROLC = SCL;
i2c_delay(delay_value);
return 0;
}
int i2c_stop(i2c_t *obj)
{
int delay_value;
switch ((int)obj->i2c) {
case I2C_0: delay_value = TSC_TSU; break;
case I2C_1: delay_value = AAIC_TSU; break;
case I2C_2: delay_value = SHIELD_TSU; break;
case I2C_3: delay_value = SHIELD_TSU; break;
}
// Actual stop bit
i2c_delay(delay_value);
obj->i2c->CONTROLC = SDA;
i2c_delay(delay_value);
obj->i2c->CONTROLS = SCL;
i2c_delay(delay_value);
obj->i2c->CONTROLS = SDA;
i2c_delay(delay_value);
return 0;
}
void i2c_frequency(i2c_t *obj, int hz) {
}
int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
{
unsigned int loop, rxdata;
int sadr, ack, bytes_read;
rxdata=0;
switch ((int)obj->i2c) {
case I2C_0:
sadr = TSC_I2C_ADDR;
break;
case I2C_1:
sadr = AAIC_I2C_ADDR;
break;
case I2C_2:
case I2C_3:
sadr = address; //LM75_I2C_ADDR; or MMA7660_I2C_ADDR;
break;
}
bytes_read = 0;
// Start bit
i2c_start(obj);
switch ((int)obj->i2c) {
case I2C_0:
// Set serial and register address
i2c_send_byte(obj,sadr);
ack += i2c_receive_ack(obj);
i2c_send_byte(obj, address);
ack += i2c_receive_ack(obj);
// Stop bit
i2c_stop(obj);
// Start bit
i2c_start_tsc(obj);
// Read from I2C address
i2c_send_byte(obj,sadr | 1);
ack += i2c_receive_ack(obj);
rxdata = (i2c_receive_byte(obj) & 0xFF);
data[((length-1)-bytes_read)] = (char)rxdata;
bytes_read++;
// Read multiple bytes
if ((length > 1) && (length < 5))
{
for (loop = 1; loop <= (length - 1); loop++)
{
// Send ACK
i2c_send_ack(obj);
// Next byte
//rxdata = ((rxdata << 8) & 0xFFFFFF00);
//rxdata |= (i2c_receive_byte(obj) & 0xFF);
rxdata = i2c_receive_byte(obj);
data[(length-1)-bytes_read] = (char)rxdata;
bytes_read++;
}
}
break;
case I2C_1:
// Set serial and register address
i2c_send_byte(obj,sadr);
ack += i2c_receive_ack(obj);
i2c_send_byte(obj, address);
ack += i2c_receive_ack(obj);
// Stop bit
i2c_stop(obj);
// Start bit
i2c_start_tsc(obj);
// Fall through to read data
case I2C_2:
case I2C_3:
// Read from preset register address pointer
i2c_send_byte(obj,sadr | 1);
ack += i2c_receive_ack(obj);
rxdata = i2c_receive_byte(obj);
data[bytes_read] = (char)rxdata;
bytes_read++;
// Read multiple bytes
if ((length > 1) && (length < 5))
{
for (loop = 1; loop <= (length - 1); loop++)
{
// Send ACK
i2c_send_ack(obj);
// Next byte
rxdata = i2c_receive_byte(obj);
data[loop] = (char)rxdata;
bytes_read++;
}
}
break;
}
i2c_send_nack(obj);
i2c_stop(obj); // Actual stop bit
return bytes_read;
}
int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
{
int ack=0;
int sadr;
char * ptr;
char addr;
ptr = (char*)data;
switch ((int)obj->i2c)
{
case I2C_0:
sadr = TSC_I2C_ADDR;
addr = address;
break;
case I2C_1:
sadr = AAIC_I2C_ADDR;
addr = address;
break;
case I2C_2:
case I2C_3:
sadr = address; //LM75_I2C_ADDR or MMA7660_I2C_ADDR;
addr = *ptr++;
break;
}
// printf("adr = %x, reg = %x\n",sadr, address);
i2c_start(obj);
// Set serial and register address
i2c_send_byte(obj,sadr);
ack += i2c_receive_ack(obj);
i2c_send_byte(obj, addr);
ack += i2c_receive_ack(obj);
for(int i = 1; i<length; i++)
{
i2c_send_byte(obj, *ptr++);
ack += i2c_receive_ack(obj);
}
i2c_stop(obj);
if(ack==3) { return 1; }
else{ return 0; }
}
void i2c_reset(i2c_t *obj) {
i2c_stop(obj);
}
int i2c_byte_read(i2c_t *obj, int last) {
return 0;
}
int i2c_byte_write(i2c_t *obj, int data) {
return 0;
}
const PinMap *i2c_master_sda_pinmap()
{
return PinMap_I2C_SDA;
}
const PinMap *i2c_master_scl_pinmap()
{
return PinMap_I2C_SCL;
}
const PinMap *i2c_slave_sda_pinmap()
{
return PinMap_I2C_SDA;
}
const PinMap *i2c_slave_scl_pinmap()
{
return PinMap_I2C_SCL;
}
#endif // #if DEVICE_I2C
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