Mouse code for the MacroRat
Diff: mbed-dev/targets/TARGET_ARM_SSG/TARGET_IOTSS/i2c_api.c
- Revision:
- 18:6a4db94011d3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_ARM_SSG/TARGET_IOTSS/i2c_api.c Sun May 14 23:18:57 2017 +0000 @@ -0,0 +1,523 @@ +/* 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" +#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 +// LM75B I2C address +#define LM75_I2C_ADDR 0x90 +// MMA7660 I2C address +#define MMA7660_I2C_ADDR 0x98 + +// Timing Delays +#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 |= 0xC000; break; + case I2C_3: CMSDK_GPIO1->ALTFUNCSET |= 0x00C0; 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; +}