[175] | 1 | /*
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| 2 | Description:
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| 3 | This is a example code for Sandbox Electronics' I2C/SPI to UART bridge module.
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| 4 | You can get one of those products on
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| 5 | http://sandboxelectronics.com
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| 6 |
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| 7 | Version:
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| 8 | V0.1
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| 9 |
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| 10 | Release Date:
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| 11 | 2014-02-16
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| 12 |
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| 13 | Author:
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| 14 | Tiequan Shao info@sandboxelectronics.com
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| 15 |
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| 16 | Lisence:
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| 17 | CC BY-NC-SA 3.0
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| 18 |
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| 19 | Please keep the above information when you use this code in your project.
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| 20 | */
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| 21 |
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| 22 | #if defined(__AVR_ATmega328P__)
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| 23 |
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| 24 | #include "SC16IS750.h"
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| 25 | #include <Wire.h>
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| 26 |
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| 27 | #define WIRE Wire
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| 28 |
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[224] | 29 | WifiData::WifiData()
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[175] | 30 | {
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[224] | 31 | device_address_sspin = (SC16IS750_ADDRESS_AA >> 1);
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[175] | 32 | peek_flag = 0;
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| 33 | }
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| 34 |
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| 35 | void WifiData::begin(uint32_t baud)
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| 36 | {
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[224] | 37 |
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[175] | 38 | if ( protocol == SC16IS750_PROTOCOL_I2C) {
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| 39 | WIRE.begin();
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| 40 | }
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| 41 | ResetDevice();
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| 42 | FIFOEnable(1);
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| 43 | SetBaudrate(baud);
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| 44 | SetLine(8,0,1);
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| 45 | }
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| 46 |
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| 47 | int WifiData::available(void)
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| 48 | {
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| 49 | return FIFOAvailableData();
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| 50 | }
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| 51 |
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| 52 | int WifiData::read(void)
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| 53 | {
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| 54 | if ( peek_flag == 0) {
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| 55 | return ReadByte();
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| 56 | } else {
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| 57 | peek_flag = 0;
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| 58 | return peek_buf;
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| 59 | }
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| 60 | }
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| 61 |
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| 62 | size_t WifiData::write(uint8_t val)
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| 63 | {
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| 64 | WriteByte(val);
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| 65 | }
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| 66 |
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| 67 | void WifiData::pinMode(uint8_t pin, uint8_t i_o)
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| 68 | {
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| 69 | GPIOSetPinMode(pin, i_o);
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| 70 | }
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| 71 |
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| 72 | void WifiData::digitalWrite(uint8_t pin, uint8_t value)
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| 73 | {
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| 74 | GPIOSetPinState(pin, value);
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| 75 | }
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| 76 |
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| 77 | uint8_t WifiData::digitalRead(uint8_t pin)
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| 78 | {
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| 79 | return GPIOGetPinState(pin);
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| 80 | }
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| 81 |
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| 82 |
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| 83 | uint8_t WifiData::ReadRegister(uint8_t reg_addr)
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| 84 | {
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| 85 | uint8_t result;
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| 86 | if ( protocol == SC16IS750_PROTOCOL_I2C ) { // register read operation via I2C
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| 87 |
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| 88 | WIRE.beginTransmission(device_address_sspin);
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| 89 | WIRE.write((reg_addr<<3));
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| 90 | WIRE.endTransmission(0);
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| 91 | WIRE.requestFrom(device_address_sspin,(uint8_t)1);
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| 92 | result = WIRE.read();
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| 93 | }
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| 94 |
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| 95 | return result;
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| 96 |
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| 97 | }
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| 98 |
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| 99 | void WifiData::WriteRegister(uint8_t reg_addr, uint8_t val)
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| 100 | {
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| 101 | if ( protocol == SC16IS750_PROTOCOL_I2C ) { // register read operation via I2C
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| 102 | WIRE.beginTransmission(device_address_sspin);
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| 103 | WIRE.write((reg_addr<<3));
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| 104 | WIRE.write(val);
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| 105 | WIRE.endTransmission(1);
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| 106 | }
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| 107 |
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| 108 |
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| 109 | return ;
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| 110 | }
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| 111 |
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| 112 | int16_t WifiData::SetBaudrate(uint32_t baudrate) //return error of baudrate parts per thousand
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| 113 | {
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| 114 | uint16_t divisor;
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| 115 | uint8_t prescaler;
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| 116 | uint32_t actual_baudrate;
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| 117 | int16_t error;
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| 118 | uint8_t temp_lcr;
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| 119 | if ( (ReadRegister(SC16IS750_REG_MCR)&0x80) == 0) { //if prescaler==1
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| 120 | prescaler = 1;
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| 121 | } else {
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| 122 | prescaler = 4;
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| 123 | }
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| 124 |
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| 125 | divisor = (SC16IS750_CRYSTCAL_FREQ/prescaler)/(baudrate*16);
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| 126 |
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| 127 | temp_lcr = ReadRegister(SC16IS750_REG_LCR);
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| 128 | temp_lcr |= 0x80;
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| 129 | WriteRegister(SC16IS750_REG_LCR,temp_lcr);
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| 130 | //write to DLL
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| 131 | WriteRegister(SC16IS750_REG_DLL,(uint8_t)divisor);
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| 132 | //write to DLH
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| 133 | WriteRegister(SC16IS750_REG_DLH,(uint8_t)(divisor>>8));
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| 134 | temp_lcr &= 0x7F;
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| 135 | WriteRegister(SC16IS750_REG_LCR,temp_lcr);
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| 136 |
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| 137 |
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| 138 | actual_baudrate = (SC16IS750_CRYSTCAL_FREQ/prescaler)/(16*divisor);
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| 139 | error = ((float)actual_baudrate-baudrate)*1000/baudrate;
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| 140 |
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| 141 | return error;
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| 142 |
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| 143 | }
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| 144 |
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| 145 | void WifiData::SetLine(uint8_t data_length, uint8_t parity_select, uint8_t stop_length )
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| 146 | {
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| 147 | uint8_t temp_lcr;
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| 148 | temp_lcr = ReadRegister(SC16IS750_REG_LCR);
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| 149 | temp_lcr &= 0xC0; //Clear the lower six bit of LCR (LCR[0] to LCR[5]
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| 150 |
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| 151 | switch (data_length) { //data length settings
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| 152 | case 5:
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| 153 | break;
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| 154 | case 6:
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| 155 | temp_lcr |= 0x01;
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| 156 | break;
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| 157 | case 7:
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| 158 | temp_lcr |= 0x02;
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| 159 | break;
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| 160 | case 8:
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| 161 | temp_lcr |= 0x03;
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| 162 | break;
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| 163 | default:
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| 164 | temp_lcr |= 0x03;
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| 165 | break;
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| 166 | }
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| 167 |
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| 168 | if ( stop_length == 2 ) {
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| 169 | temp_lcr |= 0x04;
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| 170 | }
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| 171 |
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| 172 | switch (parity_select) { //parity selection length settings
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| 173 | case 0: //no parity
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| 174 | break;
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| 175 | case 1: //odd parity
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| 176 | temp_lcr |= 0x08;
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| 177 | break;
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| 178 | case 2: //even parity
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| 179 | temp_lcr |= 0x18;
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| 180 | break;
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| 181 | case 3: //force '1' parity
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| 182 | temp_lcr |= 0x03;
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| 183 | break;
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| 184 | case 4: //force '0' parity
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| 185 | break;
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| 186 | default:
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| 187 | break;
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| 188 | }
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| 189 |
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| 190 | WriteRegister(SC16IS750_REG_LCR,temp_lcr);
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| 191 | }
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| 192 |
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| 193 | void WifiData::GPIOSetPinMode(uint8_t pin_number, uint8_t i_o)
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| 194 | {
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| 195 | uint8_t temp_iodir;
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| 196 |
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| 197 | temp_iodir = ReadRegister(SC16IS750_REG_IODIR);
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| 198 | if ( i_o == OUTPUT ) {
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| 199 | temp_iodir |= (0x01 << pin_number);
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| 200 | } else {
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| 201 | temp_iodir &= (uint8_t)~(0x01 << pin_number);
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| 202 | }
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| 203 |
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| 204 | WriteRegister(SC16IS750_REG_IODIR, temp_iodir);
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| 205 | return;
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| 206 | }
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| 207 |
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| 208 | void WifiData::GPIOSetPinState(uint8_t pin_number, uint8_t pin_state)
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| 209 | {
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| 210 | uint8_t temp_iostate;
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| 211 |
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| 212 | temp_iostate = ReadRegister(SC16IS750_REG_IOSTATE);
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| 213 | if ( pin_state == 1 ) {
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| 214 | temp_iostate |= (0x01 << pin_number);
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| 215 | } else {
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| 216 | temp_iostate &= (uint8_t)~(0x01 << pin_number);
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| 217 | }
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| 218 |
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| 219 | WriteRegister(SC16IS750_REG_IOSTATE, temp_iostate);
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| 220 | return;
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| 221 | }
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| 222 |
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| 223 |
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| 224 | uint8_t WifiData::GPIOGetPinState(uint8_t pin_number)
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| 225 | {
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| 226 | uint8_t temp_iostate;
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| 227 |
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| 228 | temp_iostate = ReadRegister(SC16IS750_REG_IOSTATE);
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| 229 | if ( temp_iostate & (0x01 << pin_number)== 0 ) {
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| 230 | return 0;
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| 231 | }
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| 232 | return 1;
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| 233 | }
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| 234 |
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| 235 | uint8_t WifiData::GPIOGetPortState(void)
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| 236 | {
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| 237 |
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| 238 | return ReadRegister(SC16IS750_REG_IOSTATE);
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| 239 |
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| 240 | }
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| 241 |
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| 242 | void WifiData::GPIOSetPortMode(uint8_t port_io)
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| 243 | {
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| 244 | WriteRegister(SC16IS750_REG_IODIR, port_io);
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| 245 | return;
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| 246 | }
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| 247 |
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| 248 | void WifiData::GPIOSetPortState(uint8_t port_state)
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| 249 | {
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| 250 | WriteRegister(SC16IS750_REG_IOSTATE, port_state);
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| 251 | return;
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| 252 | }
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| 253 |
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| 254 | void WifiData::SetPinInterrupt(uint8_t io_int_ena)
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| 255 | {
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| 256 | WriteRegister(SC16IS750_REG_IOINTENA, io_int_ena);
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| 257 | return;
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| 258 | }
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| 259 |
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| 260 | void WifiData::ResetDevice(void)
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| 261 | {
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| 262 | uint8_t reg;
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| 263 |
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| 264 | reg = ReadRegister(SC16IS750_REG_IOCONTROL);
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| 265 | reg |= 0x08;
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| 266 | WriteRegister(SC16IS750_REG_IOCONTROL, reg);
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| 267 |
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| 268 | return;
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| 269 | }
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| 270 |
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| 271 | void WifiData::ModemPin(uint8_t gpio) //gpio == 0, gpio[7:4] are modem pins, gpio == 1 gpio[7:4] are gpios
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| 272 | {
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| 273 | uint8_t temp_iocontrol;
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| 274 |
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| 275 | temp_iocontrol = ReadRegister(SC16IS750_REG_IOCONTROL);
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| 276 | if ( gpio == 0 ) {
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| 277 | temp_iocontrol |= 0x02;
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| 278 | } else {
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| 279 | temp_iocontrol &= 0xFD;
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| 280 | }
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| 281 | WriteRegister(SC16IS750_REG_IOCONTROL, temp_iocontrol);
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| 282 |
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| 283 | return;
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| 284 | }
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| 285 |
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| 286 | void WifiData::GPIOLatch(uint8_t latch)
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| 287 | {
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| 288 | uint8_t temp_iocontrol;
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| 289 |
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| 290 | temp_iocontrol = ReadRegister(SC16IS750_REG_IOCONTROL);
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| 291 | if ( latch == 0 ) {
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| 292 | temp_iocontrol &= 0xFE;
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| 293 | } else {
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| 294 | temp_iocontrol |= 0x01;
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| 295 | }
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| 296 | WriteRegister(SC16IS750_REG_IOCONTROL, temp_iocontrol);
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| 297 |
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| 298 | return;
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| 299 | }
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| 300 |
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| 301 | void WifiData::InterruptControl(uint8_t int_ena)
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| 302 | {
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| 303 | WriteRegister(SC16IS750_REG_IER, int_ena);
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| 304 | }
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| 305 |
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| 306 | uint8_t WifiData::InterruptPendingTest(void)
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| 307 | {
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| 308 | return (ReadRegister(SC16IS750_REG_IIR) & 0x01);
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| 309 | }
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| 310 |
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| 311 | void WifiData::__isr(void)
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| 312 | {
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| 313 | uint8_t irq_src;
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| 314 |
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| 315 | irq_src = ReadRegister(SC16IS750_REG_IIR);
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| 316 | irq_src = (irq_src >> 1);
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| 317 | irq_src &= 0x3F;
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| 318 |
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| 319 | switch (irq_src) {
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| 320 | case 0x06: //Receiver Line Status Error
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| 321 | break;
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| 322 | case 0x0c: //Receiver time-out interrupt
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| 323 | break;
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| 324 | case 0x04: //RHR interrupt
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| 325 | break;
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| 326 | case 0x02: //THR interrupt
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| 327 | break;
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| 328 | case 0x00: //modem interrupt;
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| 329 | break;
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| 330 | case 0x30: //input pin change of state
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| 331 | break;
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| 332 | case 0x10: //XOFF
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| 333 | break;
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| 334 | case 0x20: //CTS,RTS
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| 335 | break;
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| 336 | default:
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| 337 | break;
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| 338 | }
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| 339 | return;
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| 340 | }
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| 341 |
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| 342 | void WifiData::FIFOEnable(uint8_t fifo_enable)
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| 343 | {
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| 344 | uint8_t temp_fcr;
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| 345 |
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| 346 | temp_fcr = ReadRegister(SC16IS750_REG_FCR);
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| 347 |
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| 348 | if (fifo_enable == 0){
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| 349 | temp_fcr &= 0xFE;
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| 350 | } else {
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| 351 | temp_fcr |= 0x01;
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| 352 | }
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| 353 | WriteRegister(SC16IS750_REG_FCR,temp_fcr);
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| 354 |
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| 355 | return;
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| 356 | }
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| 357 |
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| 358 | void WifiData::FIFOReset(uint8_t rx_fifo)
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| 359 | {
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| 360 | uint8_t temp_fcr;
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| 361 |
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| 362 | temp_fcr = ReadRegister(SC16IS750_REG_FCR);
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| 363 |
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| 364 | if (rx_fifo == 0){
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| 365 | temp_fcr |= 0x04;
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| 366 | } else {
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| 367 | temp_fcr |= 0x02;
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| 368 | }
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| 369 | WriteRegister(SC16IS750_REG_FCR,temp_fcr);
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| 370 |
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| 371 | return;
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| 372 |
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| 373 | }
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| 374 |
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| 375 | void WifiData::FIFOSetTriggerLevel(uint8_t rx_fifo, uint8_t length)
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| 376 | {
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| 377 | uint8_t temp_reg;
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| 378 |
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| 379 | temp_reg = ReadRegister(SC16IS750_REG_MCR);
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| 380 | temp_reg |= 0x04;
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| 381 | WriteRegister(SC16IS750_REG_MCR,temp_reg); //SET MCR[2] to '1' to use TLR register or trigger level control in FCR register
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| 382 |
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| 383 | temp_reg = ReadRegister(SC16IS750_REG_EFR);
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| 384 | WriteRegister(SC16IS750_REG_EFR, temp_reg|0x10); //set ERF[4] to '1' to use the enhanced features
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| 385 | if (rx_fifo == 0) {
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| 386 | WriteRegister(SC16IS750_REG_TLR, length<<4); //Tx FIFO trigger level setting
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| 387 | } else {
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| 388 | WriteRegister(SC16IS750_REG_TLR, length); //Rx FIFO Trigger level setting
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| 389 | }
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| 390 | WriteRegister(SC16IS750_REG_EFR, temp_reg); //restore EFR register
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| 391 |
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| 392 | return;
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| 393 | }
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| 394 |
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| 395 | uint8_t WifiData::FIFOAvailableData(void)
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| 396 | {
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| 397 | return ReadRegister(SC16IS750_REG_RXLVL);
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| 398 |
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| 399 | }
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| 400 |
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| 401 | uint8_t WifiData::FIFOAvailableSpace(void)
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| 402 | {
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| 403 | return ReadRegister(SC16IS750_REG_TXLVL);
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| 404 |
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| 405 | }
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| 406 |
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| 407 | void WifiData::WriteByte(uint8_t val)
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| 408 | {
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| 409 | uint8_t tmp_lsr;
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| 410 | do {
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| 411 | tmp_lsr = ReadRegister(SC16IS750_REG_LSR);
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| 412 | } while ((tmp_lsr&0x20) ==0);
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| 413 |
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| 414 | WriteRegister(SC16IS750_REG_THR,val);
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| 415 |
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| 416 | }
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| 417 |
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| 418 | int WifiData::ReadByte(void)
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| 419 | {
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| 420 | volatile uint8_t val;
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| 421 | if (FIFOAvailableData() == 0) {
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| 422 |
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| 423 | return -1;
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| 424 |
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| 425 | } else {
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| 426 |
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| 427 | val = ReadRegister(SC16IS750_REG_RHR);
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| 428 | return val;
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| 429 | }
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| 430 |
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| 431 | }
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| 432 |
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| 433 | void WifiData::EnableTransmit(uint8_t tx_enable)
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| 434 | {
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| 435 | uint8_t temp_efcr;
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| 436 | temp_efcr = ReadRegister(SC16IS750_REG_EFCR);
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| 437 | if ( tx_enable == 0) {
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| 438 | temp_efcr |= 0x04;
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| 439 | } else {
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| 440 | temp_efcr &= 0xFB;
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| 441 | }
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| 442 | WriteRegister(SC16IS750_REG_EFCR,temp_efcr);
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| 443 |
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| 444 | return;
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| 445 | }
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| 446 |
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| 447 | uint8_t WifiData::ping()
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| 448 | {
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| 449 | WriteRegister(SC16IS750_REG_SPR,0x55);
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| 450 | if (ReadRegister(SC16IS750_REG_SPR) !=0x55) {
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| 451 | return 0;
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| 452 | }
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| 453 |
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| 454 | WriteRegister(SC16IS750_REG_SPR,0xAA);
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| 455 | if (ReadRegister(SC16IS750_REG_SPR) !=0xAA) {
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| 456 | return 0;
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| 457 | }
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| 458 |
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| 459 | return 1;
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| 460 |
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| 461 | }
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| 462 |
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| 463 | void WifiData::flush()
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| 464 | {
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| 465 | uint8_t tmp_lsr;
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| 466 |
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| 467 | do {
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| 468 | tmp_lsr = ReadRegister(SC16IS750_REG_LSR);
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| 469 | } while ((tmp_lsr&0x20) ==0);
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| 470 |
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| 471 |
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| 472 | }
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| 473 |
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| 474 | int WifiData::peek()
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| 475 | {
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| 476 | if ( peek_flag == 0 ) {
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| 477 | peek_buf =ReadByte();
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| 478 | if ( peek_buf >= 0 ) {
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| 479 | peek_flag = 1;
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| 480 | }
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| 481 | }
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| 482 |
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| 483 | return peek_buf;
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| 484 |
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| 485 | }
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| 486 |
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[224] | 487 | #endif
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