/***********************************************************************************************************************
PicoMite MMBasic

SPI.c

<COPYRIGHT HOLDERS>  Geoff Graham, Peter Mather
Copyright (c) 2021, <COPYRIGHT HOLDERS> All rights reserved. 
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 
1.	Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2.	Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer
    in the documentation and/or other materials provided with the distribution.
3.	The name MMBasic be used when referring to the interpreter in any documentation and promotional material and the original copyright message be displayed 
    on the console at startup (additional copyright messages may be added).
4.	All advertising materials mentioning features or use of this software must display the following acknowledgement: This product includes software developed 
    by the <copyright holder>.
5.	Neither the name of the <copyright holder> nor the names of its contributors may be used to endorse or promote products derived from this software 
    without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDERS> AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDERS> BE LIABLE FOR ANY DIRECT, 
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

************************************************************************************************************************/
/**
* @file SPI.c
* @author Geoff Graham, Peter Mather
* @brief Source for SPI MMBasic commands and functions
*/
/**
 * @cond
 * The following section will be excluded from the documentation.
 */



#include "MMBasic_Includes.h"
#include "Hardware_Includes.h"
#include "hardware/spi.h"

unsigned int *GetSendDataList(unsigned char *p, unsigned int *nbr);
long long int *GetReceiveDataBuffer(unsigned char *p, unsigned int *nbr);

uint8_t spibits=8;
uint8_t spi2bits=8;
/*  @endcond */
void cmd_spi(void) {
	    int speed;
    unsigned char *p;
    unsigned int nbr, *d;
    long long int *dd;
	if(SPI0TXpin==99 || SPI0RXpin==99|| SPI0SCKpin==99)error("Not all pins set for SPI");

    if(checkstring(cmdline, (unsigned char *)"CLOSE")) {
        if(!SPI0locked)	SPIClose();
        else error("Allocated to System SPI");
        return;
    }

    if((p = checkstring(cmdline, (unsigned char *)"WRITE")) != NULL) {
    	union car
    	{
    		uint32_t aTxBuffer;
            uint16_t bTXBuffer[2];
    		uint8_t cTxBuffer[4];
    	} mybuff;
       if(ExtCurrentConfig[SPI0TXpin] < EXT_COM_RESERVED) error("Not open");
        d = GetSendDataList(p, &nbr);
        while(nbr--) {
        	mybuff.aTxBuffer=*d++;
            if(spibits>8)spi_write16_blocking(spi0,&mybuff.bTXBuffer[0],1);
            else spi_write_blocking(spi0,&mybuff.cTxBuffer[0],1);
        }
        return;
    }

    if((p = checkstring(cmdline, (unsigned char *)"READ")) != NULL) {
    	union car
    	{
    		uint32_t aRxBuffer;
            uint16_t bRXBuffer[2];
    		uint8_t cRxBuffer[4];
    	} mybuff;
        if(ExtCurrentConfig[SPI0RXpin] < EXT_COM_RESERVED) error("Not open");
        dd = GetReceiveDataBuffer(p, &nbr);
        while(nbr--) {
        	mybuff.aRxBuffer=0;
            if(spibits>8)spi_read16_blocking(spi0,0,&mybuff.bRXBuffer[0],1);
            else spi_read_blocking(spi0,0,&mybuff.cRxBuffer[0],1);
        	*dd++ = mybuff.aRxBuffer;
        }
        return;
    }

    p = checkstring(cmdline, (unsigned char *)"OPEN");
    if(p == NULL) error("Invalid syntax");
    if(ExtCurrentConfig[SPI0TXpin] >= EXT_COM_RESERVED) error("Already open");

    { // start a new block for getargs()
    	int mode;
    	getargs(&p, 5, (unsigned char *)",");
        if(argc < 3) error("Incorrect argument count");
        mode=getinteger(argv[2]);
        speed = getinteger(argv[0]);
        spibits=8;
        if(argc==5)spibits=getint(argv[4],4,16);
        spi_init(spi0, speed);
        spi_set_format(spi0, spibits, (mode & 2 ? true: false),(mode & 1 ? true: false), SPI_MSB_FIRST);
        ExtCfg(SPI0TXpin, EXT_COM_RESERVED, 0);
        ExtCfg(SPI0RXpin, EXT_COM_RESERVED, 0);
        ExtCfg(SPI0SCKpin, EXT_COM_RESERVED, 0);
    }
}





// output and get a byte via SPI
void fun_spi(void) {
    union car
    {
        uint64_t aTxBuffer;
        uint16_t bTXBuffer[4];
        uint8_t cTxBuffer[8];
    } inbuff, outbuff;
	inbuff.aTxBuffer=0;
	outbuff.aTxBuffer=getinteger(ep);
    if(ExtCurrentConfig[SPI0TXpin] < EXT_COM_RESERVED) error("Not open");
    if(spibits>8)spi_write16_read16_blocking(spi0,&outbuff.bTXBuffer[0],&inbuff.bTXBuffer[0],1);
    else spi_write_read_blocking(spi0,&outbuff.cTxBuffer[0],&inbuff.cTxBuffer[0],1);
	iret=inbuff.aTxBuffer;
    targ = T_INT;

}

/* 
 * @cond
 * The following section will be excluded from the documentation.
 */

void SPIClose(void){
    if(SPI0TXpin!=99){
        if(ExtCurrentConfig[SPI0TXpin] < EXT_BOOT_RESERVED) {
            spi_deinit(spi0);
            ExtCfg(SPI0TXpin, EXT_NOT_CONFIG, 0);
            ExtCfg(SPI0RXpin, EXT_NOT_CONFIG, 0);      // reset to not in use
            ExtCfg(SPI0SCKpin, EXT_NOT_CONFIG, 0);
        }
    }
}
/*  @endcond */


void cmd_spi2(void) {
	int speed;
    unsigned char *p;
    unsigned int nbr, *d;
    long long int *dd;
	if(SPI1TXpin==99 || SPI1RXpin==99 || SPI1SCKpin==99)error("Not all pins set for SPI2");

    if(checkstring(cmdline, (unsigned char *)"CLOSE")) {
        if(!SPI1locked)	SPI2Close();
        else error("Allocated to System SPI");
        return;
    }

    if((p = checkstring(cmdline, (unsigned char *)"WRITE")) != NULL) {
    	union car
    	{
    		uint32_t aTxBuffer;
            uint16_t bTXBuffer[2];
    		uint8_t cTxBuffer[4];
    	} mybuff;
       if(ExtCurrentConfig[SPI1TXpin] < EXT_COM_RESERVED) error("Not open");
        d = GetSendDataList(p, &nbr);
        while(nbr--) {
        	mybuff.aTxBuffer=*d++;
            if(spi2bits>8)spi_write16_blocking(spi1,&mybuff.bTXBuffer[0],1);
            else spi_write_blocking(spi1,&mybuff.cTxBuffer[0],1);
//        	HAL_SPI_Transmit(&hspi2, mybuff.cTxBuffer,1, 5000);
        }
        return;
    }

    if((p = checkstring(cmdline, (unsigned char *)"READ")) != NULL) {
    	union car
    	{
    		uint32_t aRxBuffer;
            uint16_t bRXBuffer[2];
    		uint8_t cRxBuffer[4];
    	} mybuff;
        if(ExtCurrentConfig[SPI1TXpin] < EXT_COM_RESERVED) error("Not open");
        dd = GetReceiveDataBuffer(p, &nbr);
        while(nbr--) {
        	mybuff.aRxBuffer=0;
            if(spi2bits>8)spi_read16_blocking(spi1,0,&mybuff.bRXBuffer[0],1);
            else spi_read_blocking(spi1,0,&mybuff.cRxBuffer[0],1);
        	*dd++ = mybuff.aRxBuffer;
        }
        return;
    }

    p = checkstring(cmdline, (unsigned char *)"OPEN");
    if(p == NULL) error("Invalid syntax");
    if(ExtCurrentConfig[SPI1TXpin] >= EXT_COM_RESERVED) error("Already open");

    { // start a new block for getargs()
    	int mode;
    	getargs(&p, 5, (unsigned char *)",");
        if(argc < 3) error("Incorrect argument count");
        mode=getinteger(argv[2]);
        speed = getinteger(argv[0]);
        spi2bits=8;
        if(argc==5)spi2bits=getint(argv[4],4,16);
        spi_init(spi1, speed);
        spi_set_format(spi1, spi2bits, (mode & 2 ? true: false),(mode & 1 ? true: false), SPI_MSB_FIRST);
        ExtCfg(SPI1TXpin, EXT_COM_RESERVED, 0);
        ExtCfg(SPI1RXpin, EXT_COM_RESERVED, 0);
        ExtCfg(SPI1SCKpin, EXT_COM_RESERVED, 0);
    }
}





// output and get a byte via SPI
void fun_spi2(void) {
    union car
    {
        uint64_t aTxBuffer;
        uint16_t bTXBuffer[4];
        uint8_t cTxBuffer[8];
    } inbuff, outbuff;
	inbuff.aTxBuffer=0;
	outbuff.aTxBuffer=getinteger(ep);
    if(ExtCurrentConfig[SPI1TXpin] < EXT_COM_RESERVED) error("Not open");
    if(spi2bits>8)spi_write16_read16_blocking(spi1,&outbuff.bTXBuffer[0],&inbuff.bTXBuffer[0],1);
    else spi_write_read_blocking(spi1,&outbuff.cTxBuffer[0],&inbuff.cTxBuffer[0],1);
	iret=inbuff.aTxBuffer;
    targ = T_INT;

}

/* 
 * @cond
 * The following section will be excluded from the documentation.
 */


void SPI2Close(void){
    if(SPI1TXpin!=99){
        if(ExtCurrentConfig[SPI1TXpin] < EXT_BOOT_RESERVED) {
            spi_deinit(spi1);
            ExtCfg(SPI1TXpin, EXT_NOT_CONFIG, 0);
            ExtCfg(SPI1RXpin, EXT_NOT_CONFIG, 0);      // reset to not in use
            ExtCfg(SPI1SCKpin, EXT_NOT_CONFIG, 0);
        }
    }
}
unsigned int *GetSendDataList(unsigned char *p, unsigned int *nbr) {
    unsigned int *buf;
    int i;
    void *ptr;

    getargs(&p, MAX_ARG_COUNT, (unsigned char *)",");
    if(!(argc & 1)) error("Invalid syntax");
    *nbr = getint(argv[0], 0, 9999999);
    if(!*nbr) return NULL;
    buf = GetTempMemory(*nbr * sizeof(unsigned int));

    // first check if this is the situation with just two arguments where the second argument could be a string or a simple variable or an array
    // check the correct arg count AND that the second argument looks like a variable AND it is not a function
    if(argc == 3 && isnamestart(*argv[2]) && *skipvar(argv[2], false) == 0 && !(FindSubFun(argv[2], 1) >= 0 && strchr((char *)argv[2], '(') != NULL)) {
    	ptr = findvar(argv[2], V_NOFIND_NULL | V_EMPTY_OK);
		if(ptr == NULL) error("Invalid variable");

        // now check if it is a non array string
		if(g_vartbl[g_VarIndex].type & T_STR) {
            if(g_vartbl[g_VarIndex].dims[0] != 0) error("Invalid variable");
            if(*((char *)ptr) < *nbr) error("Insufficient data");
            ptr += sizeof(char);                                    // skip the length byte in a MMBasic string
            for (i = 0; i < *nbr; i++) {
                buf[i] = *(char *)ptr;
                ptr += sizeof(char);
            }
            return buf;
		}

        // if it is a MMFLOAT or integer do some sanity checks
        if(g_vartbl[g_VarIndex].dims[1] != 0) error("Invalid variable");
        if(*nbr > 1) {
            if(g_vartbl[g_VarIndex].dims[0] == 0) error("Invalid variable");
            if(*nbr > (g_vartbl[g_VarIndex].dims[0] + 1 - g_OptionBase)) error("Insufficient data");
        }

        // now check if it is a MMFLOAT
        if(g_vartbl[g_VarIndex].type & T_NBR) {
            for (i = 0; i < *nbr; i++) {
                buf[i] = FloatToInt32(*(MMFLOAT *)ptr);
                ptr += sizeof(MMFLOAT);
            }
            return buf;
        }

        // try for an integer
        if(g_vartbl[g_VarIndex].type & T_INT)  {
            for (i = 0; i < *nbr; i++) {
                buf[i] = *(unsigned int *)ptr;
                ptr += sizeof(long long int);
            }
            return buf;
        }

    }

    // if we got to here we must have a simple list of expressions to send (phew!)
    if(*nbr != ((argc - 1) >> 1)) error("Incorrect argument count");
    for (i = 0; i < *nbr; i++) {
        buf[i] = getinteger(argv[i + i + 2]);
    }
    return buf;
}


long long int *GetReceiveDataBuffer(unsigned char *p, unsigned int *nbr) {
    void *ptr;

    getargs(&p, 3, (unsigned char *)",");
    if(argc != 3) error("Invalid syntax");
    *nbr = getinteger(argv[0]);
    ptr = findvar(argv[2], V_NOFIND_NULL | V_EMPTY_OK);
    if(ptr == NULL) error("Invalid variable");
	if((g_vartbl[g_VarIndex].type & T_INT) && g_vartbl[g_VarIndex].dims[0] > 0 && g_vartbl[g_VarIndex].dims[1] == 0) {		// integer array
        if( (((long long int *)ptr - g_vartbl[g_VarIndex].val.ia) + *nbr) > (g_vartbl[g_VarIndex].dims[0] + 1 - g_OptionBase) )
            error("Insufficient array size");
	}
        else error("Invalid variable");
    return ptr;
}
/*  @endcond */