Mercurial > louis > kiibohd-controller

annotate Output/uartOut/arm/uart_serial.c @ 334:9ac304aa1ab5

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Adding initial dfu-upload code and debugging for Bootloader.
author Jacob Alexander <haata@kiibohd.com>
date Mon, 27 Apr 2015 00:57:34 -0700
parents 5b66d1da5377
children e8841d3c6db5
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1 /* Copyright (C) 2014-2015 by Jacob Alexander
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2 *
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3 * Permission is hereby granted, free of charge, to any person obtaining a copy
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4 * of this software and associated documentation files (the "Software"), to deal
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5 * in the Software without restriction, including without limitation the rights
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6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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7 * copies of the Software, and to permit persons to whom the Software is
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8 * furnished to do so, subject to the following conditions:
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9 *
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10 * The above copyright notice and this permission notice shall be included in
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11 * all copies or substantial portions of the Software.
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12 *
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13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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19 * THE SOFTWARE.
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20 */
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21
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22 // ----- Includes -----
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23
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24 // Compiler Includes
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25 #include <string.h> // For memcpy
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27 // Project Includes
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28 #include <Lib/OutputLib.h>
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29 #include <Lib/Interrupts.h>
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31 // Local Includes
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32 #include "uart_serial.h"
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36 // ----- Defines -----
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37
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38 // UART Configuration
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39 #if defined(_mk20dx128_) || defined(_mk20dx128vlf5_) || defined(_mk20dx256_) // UART0 Debug
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40 #define UART_BDH UART0_BDH
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41 #define UART_BDL UART0_BDL
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42 #define UART_C1 UART0_C1
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43 #define UART_C2 UART0_C2
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44 #define UART_C3 UART0_C3
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45 #define UART_C4 UART0_C4
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46 #define UART_CFIFO UART0_CFIFO
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47 #define UART_D UART0_D
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48 #define UART_PFIFO UART0_PFIFO
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49 #define UART_RCFIFO UART0_RCFIFO
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50 #define UART_RWFIFO UART0_RWFIFO
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51 #define UART_S1 UART0_S1
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52 #define UART_S2 UART0_S2
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53 #define UART_SFIFO UART0_SFIFO
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54 #define UART_TWFIFO UART0_TWFIFO
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55
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56 #define SIM_SCGC4_UART SIM_SCGC4_UART0
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57 #define IRQ_UART_STATUS IRQ_UART0_STATUS
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58
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59 #elif defined(_mk20dx256vlh7_) // UART2 Debug
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60 #define UART_BDH UART2_BDH
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61 #define UART_BDL UART2_BDL
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62 #define UART_C1 UART2_C1
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63 #define UART_C2 UART2_C2
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64 #define UART_C3 UART2_C3
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65 #define UART_C4 UART2_C4
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66 #define UART_CFIFO UART2_CFIFO
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67 #define UART_D UART2_D
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68 #define UART_PFIFO UART2_PFIFO
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69 #define UART_RCFIFO UART2_RCFIFO
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70 #define UART_RWFIFO UART2_RWFIFO
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71 #define UART_S1 UART2_S1
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72 #define UART_S2 UART2_S2
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73 #define UART_SFIFO UART2_SFIFO
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74 #define UART_TWFIFO UART2_TWFIFO
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75
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76 #define SIM_SCGC4_UART SIM_SCGC4_UART2
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77 #define IRQ_UART_STATUS IRQ_UART2_STATUS
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78
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79 #endif
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81
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83 // ----- Variables -----
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84
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85 #define uart_buffer_size 128 // 128 byte buffer
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86 volatile uint8_t uart_buffer_head = 0;
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87 volatile uint8_t uart_buffer_tail = 0;
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88 volatile uint8_t uart_buffer_items = 0;
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89 volatile uint8_t uart_buffer[uart_buffer_size];
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90
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91 volatile uint8_t uart_configured = 0;
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93
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95 // ----- Interrupt Functions -----
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96
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97 #if defined(_mk20dx128_) || defined(_mk20dx128vlf5_) || defined(_mk20dx256_) // UART0 Debug
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98 void uart0_status_isr()
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99 #elif defined(_mk20dx256vlh7_) // UART2 Debug
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100 void uart2_status_isr()
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101 #endif
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102 {
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103 cli(); // Disable Interrupts
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105 // UART0_S1 must be read for the interrupt to be cleared
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106 if ( UART_S1 & ( UART_S1_RDRF | UART_S1_IDLE ) )
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107 {
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108 uint8_t available = UART_RCFIFO;
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109
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110 // If there was actually nothing
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111 if ( available == 0 )
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112 {
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113 // Cleanup
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114 available = UART_D;
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115 UART_CFIFO = UART_CFIFO_RXFLUSH;
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116 sei();
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117 return;
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118 }
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119
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120 // Read UART0 into buffer until FIFO is empty
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121 while ( available-- > 0 )
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122 {
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123 uart_buffer[uart_buffer_tail++] = UART_D;
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124 uart_buffer_items++;
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126 // Wrap-around of tail pointer
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127 if ( uart_buffer_tail >= uart_buffer_size )
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128 {
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129 uart_buffer_tail = 0;
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130 }
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132 // Make sure the head pointer also moves if circular buffer is overwritten
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133 if ( uart_buffer_head == uart_buffer_tail )
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134 {
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135 uart_buffer_head++;
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136 }
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137
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138 // Wrap-around of head pointer
267
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139 if ( uart_buffer_head >= uart_buffer_size )
171
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140 {
267
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141 uart_buffer_head = 0;
171
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142 }
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143 }
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144 }
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145
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146 sei(); // Re-enable Interrupts
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147 }
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148
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149
173
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150
171
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151 // ----- Functions -----
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152
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153 void uart_serial_setup()
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154 {
173
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155 // Indication that the UART is not ready yet
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156 uart_configured = 0;
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157
171
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158 // Setup the the UART interface for keyboard data input
267
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159 SIM_SCGC4 |= SIM_SCGC4_UART; // Disable clock gating
171
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160
267
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161 // MCHCK / Kiibohd-dfu
174
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162 #if defined(_mk20dx128vlf5_)
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163 // Pin Setup for UART0
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164 PORTA_PCR1 = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_PFE | PORT_PCR_MUX(2); // RX Pin
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165 PORTA_PCR2 = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(2); // TX Pin
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166
267
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167 // Kiibohd-dfu
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168 #elif defined(_mk20dx256vlh7_)
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169 // Pin Setup for UART2
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170 PORTD_PCR2 = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_PFE | PORT_PCR_MUX(3); // RX Pin
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171 PORTD_PCR3 = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); // TX Pin
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172
174
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173 // Teensy
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174 #else
171
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175 // Pin Setup for UART0
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176 PORTB_PCR16 = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_PFE | PORT_PCR_MUX(3); // RX Pin
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177 PORTB_PCR17 = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); // TX Pin
174
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178 #endif
171
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179
267
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180
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181 #if defined(_mk20dx128_) || defined(_mk20dx128vlf5_) || defined(_mk20dx256_) // UART0 Debug
172
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182 // Setup baud rate - 115200 Baud
171
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183 // 48 MHz / ( 16 * Baud ) = BDH/L
172
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184 // Baud: 115200 -> 48 MHz / ( 16 * 115200 ) = 26.0416667
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185 // Thus baud setting = 26
171
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186 // NOTE: If finer baud adjustment is needed see UARTx_C4 -> BRFA in the datasheet
172
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187 uint16_t baud = 26; // Max setting of 8191
267
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188 UART_BDH = (uint8_t)(baud >> 8);
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189 UART_BDL = (uint8_t)baud;
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190 UART_C4 = 0x02;
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191
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192 #elif defined(_mk20dx256vlh7_) // UART2 Debug
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193 // Setup baud rate - 115200 Baud
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194 // Uses Bus Clock
334
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195 // 36 MHz / ( 16 * Baud ) = BDH/L
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196 // Baud: 115200 -> 36 MHz / ( 16 * 115200 ) = 19.53125
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197 // Thus baud setting = 19
267
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198 // NOTE: If finer baud adjustment is needed see UARTx_C4 -> BRFA in the datasheet
334
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199 uint16_t baud = 19; // Max setting of 8191
267
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200 UART_BDH = (uint8_t)(baud >> 8);
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201 UART_BDL = (uint8_t)baud;
334
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202 UART_C4 = 0x11;
267
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203
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204 #endif
171
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205
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206 // 8 bit, No Parity, Idle Character bit after stop
267
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207 UART_C1 = UART_C1_ILT;
171
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208
174
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209 // Interrupt notification watermarks
267
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210 #if defined(_mk20dx128_) || defined(_mk20dx128vlf5_) || defined(_mk20dx256_) // UART0 Debug
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211 UART_TWFIFO = 2;
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212 UART_RWFIFO = 4;
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213 #elif defined(_mk20dx256vlh7_) // UART2 Debug
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214 // UART2 has a single byte FIFO
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215 UART_TWFIFO = 1;
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216 UART_RWFIFO = 1;
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217 #endif
172
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218
267
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219 // TX FIFO Enabled, TX FIFO Size 1 (Max 8 datawords), RX FIFO Enabled, RX FIFO Size 1 (Max 8 datawords)
171
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220 // TX/RX FIFO Size:
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221 // 0x0 - 1 dataword
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222 // 0x1 - 4 dataword
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223 // 0x2 - 8 dataword
267
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224 UART_PFIFO = UART_PFIFO_TXFE | UART_PFIFO_RXFE;
171
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225
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226 // Reciever Inversion Disabled, LSBF
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227 // UART_S2_RXINV UART_S2_MSBF
267
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228 UART_S2 |= 0x00;
171
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229
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230 // Transmit Inversion Disabled
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231 // UART_C3_TXINV
267
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232 UART_C3 |= 0x00;
171
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233
172
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234 // TX Enabled, RX Enabled, RX Interrupt Enabled, Generate idles
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235 // UART_C2_TE UART_C2_RE UART_C2_RIE UART_C2_ILIE
267
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236 UART_C2 = UART_C2_TE | UART_C2_RE | UART_C2_RIE | UART_C2_ILIE;
171
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237
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238 // Add interrupt to the vector table
267
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239 NVIC_ENABLE_IRQ( IRQ_UART_STATUS );
173
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240
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241 // UART is now ready to use
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242 uart_configured = 1;
171
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243 }
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244
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245
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246 // Get the next character, or -1 if nothing received
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247 int uart_serial_getchar()
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248 {
173
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249 if ( !uart_configured )
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250 return -1;
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251
171
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252 unsigned int value = -1;
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253
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254 // Check to see if the FIFO has characters
267
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255 if ( uart_buffer_items > 0 )
171
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256 {
267
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257 value = uart_buffer[uart_buffer_head++];
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258 uart_buffer_items--;
171
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259
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260 // Wrap-around of head pointer
267
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261 if ( uart_buffer_head >= uart_buffer_size )
171
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262 {
267
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263 uart_buffer_head = 0;
171
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264 }
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265 }
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266
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267 return value;
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268 }
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269
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270
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271 // Number of bytes available in the receive buffer
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272 int uart_serial_available()
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273 {
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274 return uart_buffer_items;
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275 }
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276
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277
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278 // Discard any buffered input
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279 void uart_serial_flush_input()
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280 {
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281 uart_buffer_head = 0;
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282 uart_buffer_tail = 0;
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283 uart_buffer_items = 0;
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284 }
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285
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286
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287 // Transmit a character. 0 returned on success, -1 on error
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288 int uart_serial_putchar( uint8_t c )
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289 {
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290 if ( !uart_configured )
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291 return -1;
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292
267
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293 while ( !( UART_SFIFO & UART_SFIFO_TXEMPT ) ); // Wait till there is room to send
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294 UART_D = c;
172
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295
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296 return 0;
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297 }
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298
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299
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300 int uart_serial_write( const void *buffer, uint32_t size )
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301 {
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302 if ( !uart_configured )
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303 return -1;
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304
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305 const uint8_t *data = (const uint8_t *)buffer;
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306 uint32_t position = 0;
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307
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308 // While buffer is not empty and transmit buffer is
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309 while ( position < size )
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310 {
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311 while ( !( UART_SFIFO & UART_SFIFO_TXEMPT ) ); // Wait till there is room to send
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312 UART_D = data[position++];
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313 }
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314
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315 return 0;
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316 }
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317
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318
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319 void uart_serial_flush_output()
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320 {
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321 // Delay until buffer has been sent
267
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322 while ( !( UART_SFIFO & UART_SFIFO_TXEMPT ) ); // Wait till there is room to send
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323 }
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324
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325
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326 void uart_device_reload()
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327 {
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328 asm volatile("bkpt");
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329 }
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330