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