/*
 * This file is part of the Bus Pirate project (buspirate.com).
 *
 * Originally written by hackaday.com <legal@hackaday.com>
 *
 * To the extent possible under law, hackaday.com <legal@hackaday.com> has
 * waived all copyright and related or neighboring rights to Bus Pirate. This
 * work is published from United States.
 *
 * For details see: http://creativecommons.org/publicdomain/zero/1.0/.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 */

#include "base.h"

//get bus pirate ready after first start
//or clean up after any dirty modules
//modules MUST teardown any PPS functions on the CMD_CLEANUP command
void bpInit(void){
	//do this manually so there aren't problems with hardware
	//that has I/O on different ports
	BP_MOSI_DIR=1;
	BP_CLK_DIR=1; 
	BP_MISO_DIR=1;
	BP_CS_DIR=1; 
	BP_AUX_DIR=1; 
	BP_LEDMODE=0; //mode LED OFF
	BP_LEDMODE_DIR=0;
	#ifdef BUSPIRATEV1A
		BP_PIN6_DIR=1; //AUX2... unused
		BP_LEDPWR=1; //light power led
		BP_LEDPWR_DIR=0;
	#endif
	
	#if defined( BUSPIRATEV0A) || defined( BUSPIRATEV2)
		BP_PULLUP_OFF();
	#endif

	#if defined( BUSPIRATEV1A) || defined( BUSPIRATEV2)
		
		BP_VREG_OFF();//disable the VREG

		//setup voltage monitoring on ADC. Should be moved to hardwarevx.h!
		AD1PCFGbits.PCFG9=0; //B15/AN9/ADC4/50V
		AD1PCFGbits.PCFG10=0;//B14/AN10/ADC3/33V
		AD1PCFGbits.PCFG11=0;//B13/AN11/ADC2/Vextpullup
		AD1PCFGbits.PCFG12=0;//B12/AN12/ADC1/EXT
		//AD1PCFG&=(~0b11110);//analog pins
	
		//configure the ADC
		AD1CON1bits.SSRC  = 0b111;// SSRC<3:0> = 111 implies internal
									// counter ends sampling and starts
									// converting.
		AD1CSSL = 0;
		AD1CON3 = 0x1F02; // Sample time = 31Tad,
							// Tad = 2 Tcy
		AD1CON2 = 0;
	#endif
}


//get a byte from UART
unsigned char UART1RX(void){

    while(U1STAbits.URXDA == 0);
	return U1RXREG;
}

//add byte to buffer, pause if full
//uses PIC 4 byte UART FIFO buffer
void UART1TX(char c){
	while(U1STAbits.UTXBF == 1); //if buffer is full, wait
    U1TXREG = c;
}

//Initialize the terminal UART for the speed currently set in bpConfig.termSpeed
void InitializeUART1(void){
	//set pin configuration using peripheral pin select
	BP_TERM_RX=BP_TERM_RX_RP;   //Inputs UART1 RX RPINR18bits.U1RXR=4;
	BP_TERM_TX_RP=BP_TERM_TX; 		// Outputs UART1 TX RPOR1bits.RP3R=U1TX_IO;

    U1BRG = 34;//13332=300, 1666=2400, 416=9600, 34@32mhz=115200....
    U1MODE = 0;
    U1MODEbits.BRGH = 1;
    U1STA = 0;
    U1MODEbits.UARTEN = 1;
    U1STAbits.UTXEN = 1;
    IFS0bits.U1RXIF = 0;
}

//delay in MS
void bpDelayMS(const unsigned char delay){
	volatile unsigned int i;
	volatile unsigned char c;
	
	for(c=0;c<delay;c++){
		for(i=0;i<4;i++) bpDelayUS(250);
	}

}

//delay in US
void bpDelayUS(const unsigned char delay)
{
	volatile unsigned char i;
	
	for(i=0;i<delay;i++){//@32MHz = 16MIPS, 16I/uS
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
		asm( "nop" );
	}
}