Mouse code for the MacroRat
mbed-dev/targets/TARGET_ARM_SSG/TARGET_MPS2/i2c_api.c
- Committer:
- sahilmgandhi
- Date:
- 2017-05-14
- Revision:
- 18:6a4db94011d3
File content as of revision 18:6a4db94011d3:
/* 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 #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; }