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/* Copyright (C) 2015 by Jacob Alexander |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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// ----- Includes ----- |
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// Local Includes |
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#include "mchck.h" |
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// ----- Defines ----- |
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// UART Configuration |
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#if defined(_mk20dx256vlh7_) // UART2 Debug |
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#define UART_BDH UART2_BDH |
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#define UART_BDL UART2_BDL |
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#define UART_C1 UART2_C1 |
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#define UART_C2 UART2_C2 |
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#define UART_C3 UART2_C3 |
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#define UART_C4 UART2_C4 |
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#define UART_CFIFO UART2_CFIFO |
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#define UART_D UART2_D |
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#define UART_PFIFO UART2_PFIFO |
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#define UART_RCFIFO UART2_RCFIFO |
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#define UART_RWFIFO UART2_RWFIFO |
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#define UART_S1 UART2_S1 |
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#define UART_S2 UART2_S2 |
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#define UART_SFIFO UART2_SFIFO |
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#define UART_TWFIFO UART2_TWFIFO |
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#define SIM_SCGC4_UART SIM_SCGC4_UART2 |
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#define IRQ_UART_STATUS IRQ_UART2_STATUS |
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#else |
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#error "Bootloader UART Debug unsupported" |
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#endif |
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// ----- Functions ----- |
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#if defined(_mk20dx256vlh7_) |
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void uart_serial_setup() |
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{ |
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// Setup the the UART interface for keyboard data input |
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SIM_SCGC4 |= SIM_SCGC4_UART; // Disable clock gating |
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// Kiibohd-dfu |
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#if defined(_mk20dx256vlh7_) |
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// Pin Setup for UART2 |
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PORTD_PCR3 = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); // TX Pin |
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#endif |
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#if defined(_mk20dx256vlh7_) // UART2 Debug |
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// Setup baud rate - 115200 Baud |
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// Uses Bus Clock |
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// 36 MHz / ( 16 * Baud ) = BDH/L |
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// Baud: 115200 -> 36 MHz / ( 16 * 115200 ) = 19.53125 |
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// Thus baud setting = 19 |
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// NOTE: If finer baud adjustment is needed see UARTx_C4 -> BRFA in the datasheet |
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uint16_t baud = 19; // Max setting of 8191 |
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UART_BDH = (uint8_t)(baud >> 8); |
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UART_BDL = (uint8_t)baud; |
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UART_C4 = 0x11; |
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#endif |
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// 8 bit, No Parity, Idle Character bit after stop |
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UART_C1 = UART_C1_ILT; |
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// TX FIFO Enabled, TX FIFO Size 1 (Max 8 datawords) |
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// TX/RX FIFO Size: |
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// 0x0 - 1 dataword |
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// 0x1 - 4 dataword |
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// 0x2 - 8 dataword |
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UART_PFIFO = UART_PFIFO_TXFE; |
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// TX Enabled, RX Enabled, RX Interrupt Enabled, Generate idles |
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// UART_C2_TE UART_C2_RE UART_C2_RIE UART_C2_ILIE |
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UART_C2 = UART_C2_TE | UART_C2_ILIE; |
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} |
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int uart_serial_write( const void *buffer, uint32_t size ) |
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{ |
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const uint8_t *data = (const uint8_t *)buffer; |
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uint32_t position = 0; |
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// While buffer is not empty and transmit buffer is |
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while ( position < size ) |
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{ |
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while ( !( UART_SFIFO & UART_SFIFO_TXEMPT ) ); // Wait till there is room to send |
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UART_D = data[position++]; |
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} |
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return 0; |
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} |
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int Output_putstr( char* str ) |
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{ |
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uint32_t count = 0; |
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// Count characters until NULL character, then send the amount counted |
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while ( str[count] != '\0' ) |
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count++; |
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return uart_serial_write( str, count ); |
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} |
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uint16_t lenStr( char* in ) |
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{ |
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// Iterator |
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char *pos; |
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// Loop until null is found |
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for ( pos = in; *pos; pos++ ); |
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// Return the difference between the pointers of in and pos (which is the string length) |
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return (pos - in); |
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} |
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void revsStr( char* in ) |
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{ |
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// Iterators |
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int i, j; |
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// Temp storage |
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char c; |
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// Loop through the string, and reverse the order of the characters |
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for ( i = 0, j = lenStr( in ) - 1; i < j; i++, j-- ) |
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{ |
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c = in[i]; |
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in[i] = in[j]; |
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in[j] = c; |
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} |
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} |
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void hexToStr_op( uint32_t in, char* out, uint8_t op ) |
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{ |
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// Position container |
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uint32_t pos = 0; |
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// Evaluate through digits as hex |
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do |
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{ |
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uint32_t cur = in % 16; |
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out[pos++] = cur + (( cur < 10 ) ? '0' : 'A' - 10); |
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} |
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while ( (in /= 16) > 0 ); |
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// Output formatting options |
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switch ( op ) |
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{ |
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case 1: // Add 0x |
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out[pos++] = 'x'; |
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out[pos++] = '0'; |
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break; |
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case 2: // 8-bit padding |
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case 4: // 16-bit padding |
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case 8: // 32-bit padding |
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while ( pos < op ) |
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out[pos++] = '0'; |
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break; |
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} |
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// Append null |
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out[pos] = '\0'; |
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// Reverse the string to the correct order |
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revsStr( out ); |
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} |
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void printHex_op( uint32_t in, uint8_t op ) |
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{ |
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// With an op of 1, the max number of characters is 6 + 1 for null |
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// e.g. "0xFFFF\0" |
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// op 2 and 4 require fewer characters (2+1 and 4+1 respectively) |
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char tmpStr[7]; |
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// Convert number |
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hexToStr_op( in, tmpStr, op ); |
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// Print number |
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Output_putstr( tmpStr ); |
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} |
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#endif |
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