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I2C.c
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I2C.c
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/***********************************************************************************************************************
PicoMite MMBasic
I2C.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.
************************************************************************************************************************/
#include "MMBasic_Includes.h"
#include "Hardware_Includes.h"
#include "hardware/i2c.h"
#include "hardware/irq.h"
#define nunaddr 0xA4/2;
#define PinRead(a) gpio_get(PinDef[a].GPno)
extern void DrawBufferMEM(int x1, int y1, int x2, int y2, unsigned char* p) ;
extern void ReadBufferMEM(int x1, int y1, int x2, int y2, unsigned char* buff);
// Declare functions
void i2cEnable(unsigned char *p);
void i2cDisable(unsigned char *p);
void i2cSend(unsigned char *p);
void i2cSendSlave(unsigned char *p, int channel);
void i2cReceive(unsigned char *p);
void i2c_disable(void);
void i2c_enable(int bps);
void i2c_masterCommand(int timer, unsigned char *buff);
void i2cCheck(unsigned char *p);
void i2c2Enable(unsigned char *p);
void i2c2Disable(unsigned char *p);
void i2c2Send(unsigned char *p);
void i2c2Receive(unsigned char *p);
void i2c2_disable(void);
void i2c2_enable(int bps);
void i2c2_masterCommand(int timer, unsigned char *buff);
void i2c2Check(unsigned char *p);
static MMFLOAT *I2C_Rcvbuf_Float; // pointer to the master receive buffer for a MMFLOAT
static long long int *I2C_Rcvbuf_Int; // pointer to the master receive buffer for an integer
static char *I2C_Rcvbuf_String; // pointer to the master receive buffer for a string
static unsigned int I2C_Addr; // I2C device address
static volatile unsigned int I2C_Sendlen; // length of the master send buffer
static volatile unsigned int I2C_Rcvlen; // length of the master receive buffer
static unsigned char I2C_Send_Buffer[256]; // I2C send buffer
bool I2C_enabled=false; // I2C enable marker
unsigned int I2C_Timeout; // master timeout value
volatile unsigned int I2C_Status; // status flags
static int mmI2Cvalue;
// value of MM.I2C
static MMFLOAT *I2C2_Rcvbuf_Float; // pointer to the master receive buffer for a MMFLOAT
static long long int *I2C2_Rcvbuf_Int; // pointer to the master receive buffer for an integer
static char *I2C2_Rcvbuf_String; // pointer to the master receive buffer for a string
static unsigned int I2C2_Addr; // I2C device address
static volatile unsigned int I2C2_Sendlen; // length of the master send buffer
static volatile unsigned int I2C2_Rcvlen; // length of the master receive buffer
static unsigned char I2C_Send_Buffer[256]; // I2C send buffer
bool I2C2_enabled=false; // I2C enable marker
unsigned int I2C2_Timeout; // master timeout value
volatile unsigned int I2C2_Status; // status flags
//static char I2C_Rcv_Buffer[256]; // I2C receive buffer
static unsigned int I2C_Slave_Addr; // slave address
char *I2C_Slave_Send_IntLine; // pointer to the slave send interrupt line number
char *I2C_Slave_Receive_IntLine; // pointer to the slave receive interrupt line number
//static char I2C2_Rcv_Buffer[256]; // I2C receive buffer
char *I2C2_Slave_Send_IntLine; // pointer to the slave send interrupt line number
char *I2C2_Slave_Receive_IntLine; // pointer to the slave receive interrupt line number
static unsigned int I2C2_Slave_Addr; // slave address
bool noRTC=false, noI2C=false;
extern void SaveToBuffer(void);
extern void CompareToBuffer(void);
extern void DrawPixelMEM(int x1, int y1, int c);
extern void DrawRectangleMEM(int x1, int y1, int x2, int y2, int c);
extern void DrawBitmapMEM(int x1, int y1, int width, int height, int scale, int fc, int bc, unsigned char *bitmap);
void i2cSlave(unsigned char *p);
void i2c2Slave(unsigned char *p);
void i2cReceiveSlave(unsigned char *p, int channel);
int CameraSlice=-1;
int CameraChannel=-1;
extern void PWMoff(int slice);
const unsigned char nuninit[2]={0xF0,0x55};
const unsigned char nuninit2[2]={0xFB,0x0};
const unsigned char readcontroller[1]={0};
const unsigned char nunid[1]={0xFC};
volatile int classic1=0;
uint8_t nunbuff[10];
uint32_t swap32(uint32_t in)
{
in = __builtin_bswap32(in);
return in;
}
volatile struct s_nunstruct nunstruct[5];
char *nunInterruptc[5]={NULL};
bool nunfoundc[5]={false};
/*******************************************************************************************
I2C related commands in MMBasic
===============================
These are the functions responsible for executing the I2C related commands in MMBasic
They are supported by utility functions that are grouped at the end of this file
********************************************************************************************/
void I2C_Send_Command(char command){
int i2cret;
int i2caddr=SSD1306_I2C_Addr;
I2C_Send_Buffer[0]=0;
I2C_Send_Buffer[1]=command;
I2C_Sendlen=2;
I2C_Timeout=1000;
if(I2C1locked)i2cret=i2c_write_timeout_us(i2c1, (uint8_t)i2caddr, (uint8_t *)I2C_Send_Buffer, I2C_Sendlen,false, I2C_Timeout*1000);
else i2cret=i2c_write_timeout_us(i2c0, (uint8_t)i2caddr, (uint8_t *)I2C_Send_Buffer, I2C_Sendlen,false, I2C_Timeout*1000);
mmI2Cvalue=0;
if(i2cret==PICO_ERROR_GENERIC)mmI2Cvalue=1;
if(i2cret==PICO_ERROR_TIMEOUT)mmI2Cvalue=2;
// mmI2Cvalue=HAL_I2C_Master_Transmit(&hi2c1, (uint16_t)i2caddr, I2C_Send_Buffer, I2C_Sendlen, I2C_Timeout);
}
void I2C_Send_Data(unsigned char* data, int n){
int i2cret;
int i, i2caddr=SSD1306_I2C_Addr;
I2C_Sendlen=n+1;
I2C_Send_Buffer[0]=0x40;
I2C_Timeout=1000;
for(i=1;i<=n;i++){
I2C_Send_Buffer[i]=data[i-1];
}
if(I2C1locked)i2cret=i2c_write_timeout_us(i2c1, (uint8_t)i2caddr, (uint8_t *)I2C_Send_Buffer, I2C_Sendlen,false, I2C_Timeout*1000);
else i2cret=i2c_write_timeout_us(i2c0, (uint8_t)i2caddr, (uint8_t *)I2C_Send_Buffer, I2C_Sendlen,false, I2C_Timeout*1000);
mmI2Cvalue=0;
if(i2cret==PICO_ERROR_GENERIC)mmI2Cvalue=1;
if(i2cret==PICO_ERROR_TIMEOUT)mmI2Cvalue=2;
}
#ifndef PICOMITEVGA
void ConfigDisplayI2C(unsigned char *p) {
unsigned char DISPLAY_TYPE=0;
getargs(&p, 5, (unsigned char *)",");
if(!(argc == 3 || argc == 5)) error("Argument count");
if(checkstring(argv[0], (unsigned char *)"SSD1306I2C")) {
DISPLAY_TYPE = SSD1306I2C;
} else if(checkstring(argv[0], (unsigned char *)"SSD1306I2C32")) {
DISPLAY_TYPE = SSD1306I2C32;
} else
error("Invalid display type");
if(checkstring(argv[2], (unsigned char *)"L") || checkstring(argv[2], (unsigned char *)"LANDSCAPE"))
Option.DISPLAY_ORIENTATION = LANDSCAPE;
else if(checkstring(argv[2], (unsigned char *)"P") || checkstring(argv[2], (unsigned char *)"PORTRAIT"))
Option.DISPLAY_ORIENTATION = PORTRAIT;
else if(checkstring(argv[2], (unsigned char *)"RL") || checkstring(argv[2], (unsigned char *)"RLANDSCAPE"))
Option.DISPLAY_ORIENTATION = RLANDSCAPE;
else if(checkstring(argv[2], (unsigned char *)"RP") || checkstring(argv[2], (unsigned char *)"RPORTRAIT"))
Option.DISPLAY_ORIENTATION = RPORTRAIT;
else error("Orientation");
Option.I2Coffset=0;
if(argc==5)Option.I2Coffset=getint(argv[4],0,10);
if(!(I2C0locked || I2C1locked))error("SYSTEM I2C not configured");
Option.Refresh = 1;
Option.DISPLAY_TYPE=DISPLAY_TYPE;
}
void InitDisplayI2C(int InitOnly){
if(Option.DISPLAY_TYPE == 0 || Option.DISPLAY_TYPE > I2C_PANEL) return;
// I2Con();
// i2c_enable(display_details[Option.DISPLAY_TYPE].speed);
DrawRectangle = DrawRectangleMEM;
DrawBitmap = DrawBitmapMEM;
DrawBuffer = DrawBufferMEM;
ReadBuffer = ReadBufferMEM;
DrawPixel = DrawPixelMEM;
DrawBLITBuffer = DrawBufferMEM;
ReadBLITBuffer = ReadBufferMEM;
DisplayHRes = display_details[Option.DISPLAY_TYPE].horizontal;
DisplayVRes = display_details[Option.DISPLAY_TYPE].vertical;
I2C_Send_Command(0xAE);//DISPLAYOFF
I2C_Send_Command(0xD5);//DISPLAYCLOCKDIV
I2C_Send_Command(0x80);//the suggested ratio &H80
I2C_Send_Command(0xA8);//MULTIPLEX
if(Option.DISPLAY_TYPE==SSD1306I2C)I2C_Send_Command(0x3F);
else if(Option.DISPLAY_TYPE==SSD1306I2C32)I2C_Send_Command(0x1F);
I2C_Send_Command(0xD3);//DISPLAYOFFSET
I2C_Send_Command(0x0);//no offset
I2C_Send_Command(0x40);//STARTLINE
I2C_Send_Command(0x8D);//CHARGEPUMP
I2C_Send_Command(0x14);
I2C_Send_Command(0x20);//MEMORYMODE
I2C_Send_Command(0x00);//&H0 act like ks0108
I2C_Send_Command(0xA1);//SEGREMAP OR 1
I2C_Send_Command(0xC8);//COMSCANDEC
I2C_Send_Command(0xDA);//COMPINS
if(Option.DISPLAY_TYPE==SSD1306I2C)I2C_Send_Command(0x12);
else if(Option.DISPLAY_TYPE==SSD1306I2C32)I2C_Send_Command(0x02);
I2C_Send_Command(0x81);//SETCONTRAST
I2C_Send_Command(0xCF);
I2C_Send_Command(0xd9);//SETPRECHARGE
I2C_Send_Command(0xF1);
I2C_Send_Command(0xDB);//VCOMDETECT
I2C_Send_Command(0x40);
I2C_Send_Command(0xA4);//DISPLAYALLON_RESUME
I2C_Send_Command(0xA6);//NORMALDISPLAY
I2C_Send_Command(0xAF);//DISPLAYON
if(Option.DISPLAY_ORIENTATION & 1) {
VRes=DisplayVRes;
HRes=DisplayHRes;
} else {
VRes=DisplayHRes;
HRes=DisplayVRes;
}
if(!InitOnly) {
ResetDisplay();
ClearScreen(0);
Display_Refresh();
}
}
#endif
void cmd_i2c(void) {
unsigned char *p;//, *pp;
if(I2C0SDApin==99 || I2C0SCLpin==99)error("Pin not set for I2C");
if((p = checkstring(cmdline, (unsigned char *)"OPEN")) != NULL)
i2cEnable(p);
else if((p = checkstring(cmdline, (unsigned char *)"CLOSE")) != NULL)
i2cDisable(p);
else if((p = checkstring(cmdline, (unsigned char *)"WRITE")) != NULL)
i2cSend(p);
else if((p = checkstring(cmdline, (unsigned char *)"READ")) != NULL)
i2cReceive(p);
else if((p = checkstring(cmdline, (unsigned char *)"CHECK")) != NULL)
i2cCheck(p);
else if((p = checkstring(cmdline, (unsigned char *)"SLAVE OPEN")) != NULL)
i2cSlave(p);
else if((p = checkstring(cmdline, (unsigned char *)"SLAVE READ")) != NULL)
i2cReceiveSlave(p,0);
else if((p = checkstring(cmdline, (unsigned char *)"SLAVE WRITE")) != NULL)
i2cSendSlave(p,0);
else if((p = checkstring(cmdline, (unsigned char *)"SLAVE CLOSE")) != NULL)
i2cDisable(p);
else
error("Unknown command");
}
void cmd_i2c2(void) {
unsigned char *p;//, *pp;
if(I2C1SDApin==99 || I2C1SCLpin==99)error("Pin not set for I2C2");
if((p = checkstring(cmdline, (unsigned char *)"OPEN")) != NULL)
i2c2Enable(p);
else if((p = checkstring(cmdline, (unsigned char *)"CLOSE")) != NULL)
i2c2Disable(p);
else if((p = checkstring(cmdline, (unsigned char *)"WRITE")) != NULL)
i2c2Send(p);
else if((p = checkstring(cmdline, (unsigned char *)"READ")) != NULL)
i2c2Receive(p);
else if((p = checkstring(cmdline, (unsigned char *)"CHECK")) != NULL)
i2c2Check(p);
else if((p = checkstring(cmdline, (unsigned char *)"SLAVE OPEN")) != NULL)
i2c2Slave(p);
else if((p = checkstring(cmdline, (unsigned char *)"SLAVE READ")) != NULL)
i2cReceiveSlave(p,1);
else if((p = checkstring(cmdline, (unsigned char *)"SLAVE WRITE")) != NULL)
i2cSendSlave(p,1);
else if((p = checkstring(cmdline, (unsigned char *)"SLAVE CLOSE")) != NULL)
i2c2Disable(p);
else
error("Unknown command");
}
void __not_in_flash_func(i2c0_irq_handler)(void) {
// Get interrupt status
uint32_t status = i2c0->hw->intr_stat;
//is a write request? Or a read request ? event
if (status & I2C_IC_INTR_STAT_R_RX_FULL_BITS) {
i2c0->hw->intr_mask = I2C_IC_INTR_MASK_M_RD_REQ_BITS;
I2C_Status |= I2C_Status_Slave_Receive_Rdy;
} else if (status & I2C_IC_INTR_STAT_R_RD_REQ_BITS) {
i2c0->hw->clr_rd_req;
I2C_Status |= I2C_Status_Slave_Send_Rdy;
}
}
void __not_in_flash_func(i2c1_irq_handler)(void) {
// Get interrupt status
uint32_t status = i2c1->hw->intr_stat;
//is a write request? Or a read request ? event
if (status & I2C_IC_INTR_STAT_R_RX_FULL_BITS) {
i2c1->hw->intr_mask = I2C_IC_INTR_MASK_M_RD_REQ_BITS;
I2C2_Status |= I2C_Status_Slave_Receive_Rdy;
} else if (status & I2C_IC_INTR_STAT_R_RD_REQ_BITS) {
i2c1->hw->clr_rd_req;
I2C2_Status |= I2C_Status_Slave_Send_Rdy;
}
}
void i2cSlave(unsigned char *p){
int addr;
getargs(&p, 5, (unsigned char *)",");
if(argc != 5) error("Argument count");
if(I2C_Status & I2C_Status_Slave) error("Slave already open");
addr = getinteger(argv[0]);
ExtCfg(I2C0SDApin, EXT_COM_RESERVED, 0);
ExtCfg(I2C0SCLpin, EXT_COM_RESERVED, 0);
gpio_pull_up(PinDef[I2C0SDApin].GPno);
gpio_pull_up(PinDef[I2C0SCLpin].GPno);
i2c_init(i2c0, 400000);
I2C_Slave_Addr = addr;
I2C_Slave_Send_IntLine = (char *)GetIntAddress(argv[2]); // get the interrupt routine's location
I2C_Slave_Receive_IntLine = (char *)GetIntAddress(argv[4]); // get the interrupt routine's location
InterruptUsed = true;
i2c_set_slave_mode(i2c0,true, I2C_Slave_Addr);
// Enable the I2C interrupts we want to process
i2c0->hw->intr_mask = I2C_IC_INTR_STAT_R_RX_FULL_BITS | I2C_IC_INTR_MASK_M_RD_REQ_BITS;
// Set up the interrupt handler to service I2C interrupts
irq_set_exclusive_handler(I2C0_IRQ, i2c0_irq_handler);
irq_set_enabled(I2C0_IRQ, true);
I2C_Status=I2C_Status_Slave;
}
void i2c2Slave(unsigned char *p){
int addr;
getargs(&p, 5, (unsigned char *)",");
if(argc != 5) error("Argument count");
if(I2C2_Status & I2C_Status_Slave) error("Slave already open");
addr = getinteger(argv[0]);
ExtCfg(I2C1SDApin, EXT_COM_RESERVED, 0);
ExtCfg(I2C1SCLpin, EXT_COM_RESERVED, 0);
gpio_pull_up(PinDef[I2C1SDApin].GPno);
gpio_pull_up(PinDef[I2C1SCLpin].GPno);
i2c_init(i2c1, 400000);
I2C2_Slave_Addr = addr;
I2C2_Slave_Send_IntLine = (char *)GetIntAddress(argv[2]); // get the interrupt routine's location
I2C2_Slave_Receive_IntLine = (char *)GetIntAddress(argv[4]); // get the interrupt routine's location
InterruptUsed = true;
i2c_set_slave_mode(i2c1,true, I2C2_Slave_Addr);
// Enable the I2C interrupts we want to process
i2c1->hw->intr_mask = I2C_IC_INTR_STAT_R_RX_FULL_BITS | I2C_IC_INTR_MASK_M_RD_REQ_BITS;
// Set up the interrupt handler to service I2C interrupts
irq_set_exclusive_handler(I2C1_IRQ, i2c1_irq_handler);
irq_set_enabled(I2C1_IRQ, true);
I2C2_Status=I2C_Status_Slave;
}
int DoRtcI2C(int addr, unsigned char *buff) {
if(I2C0locked){
I2C_Addr = addr; // address of the device
i2c_masterCommand(1,buff);
}
else {
I2C2_Addr = addr; // address of the device
i2c2_masterCommand(1,buff);
}
return !mmI2Cvalue;
}
#ifndef USBKEYBOARD
void CheckI2CKeyboard(int noerror, int read){
uint16_t buff;
// int readover=0;
static int ctrlheld=0;
// while(readover==0){
if(I2C0locked){
if(read==0){
I2C_Sendlen = 1; // send one byte
I2C_Rcvlen = 0;
I2C_Status = 0;
I2C_Send_Buffer[0] = 9; // the first register to read
if(!(DoRtcI2C(0x1F, NULL))) goto i2c_error_exit;
} else {
I2C_Rcvbuf_String = (char *)&buff; // we want a string of bytes
I2C_Rcvbuf_Float = NULL;
I2C_Rcvbuf_Int = NULL;
I2C_Rcvlen = 2; // get 7 bytes
I2C_Sendlen = 0;
if(!DoRtcI2C(0x1F, (unsigned char *)&buff)) goto i2c_error_exit;
}
} else {
I2C2_Sendlen = 1; // send one byte
I2C2_Rcvlen = 0;
I2C2_Status = 0;
I2C_Send_Buffer[0] = 9; // the first register to read
if(!(DoRtcI2C(0x1F, NULL)))goto i2c_error_exit;
I2C2_Rcvbuf_String = (char *)&buff; // we want a string of bytes
I2C2_Rcvbuf_Float = NULL;
I2C2_Rcvbuf_Int = NULL;
I2C2_Rcvlen = 2; // get 7 bytes
I2C2_Sendlen = 0;
if(!DoRtcI2C(0x1F, (unsigned char *)&buff)) goto i2c_error_exit;
}
uSec(1000);
if(buff){
if(buff==0x1203)ctrlheld=0;
else if(buff==0x1202) {
ctrlheld=1;
}
else if((buff & 0xff)==1) {
int c=buff>>8;
if(c==6)c=ESC;
if(c==0x11)c=F1;
if(c==5)c=F2;
if(c==0x7)c=F4;
if(c>='a' && c<='z' && ctrlheld)c=c-'a'+1;
if(c==BreakKey)
{ // if the user wants to stop the progran
MMAbort = true; // set the flag for the interpreter to see
ConsoleRxBufHead = ConsoleRxBufTail; // empty the buffer
// break;
}
else {
ConsoleRxBuf[ConsoleRxBufHead] = c; // store the byte in the ring buffer
if (ConsoleRxBuf[ConsoleRxBufHead] == keyselect && KeyInterrupt != NULL)
{
Keycomplete = true;
}
else
{
ConsoleRxBufHead = (ConsoleRxBufHead + 1) % CONSOLE_RX_BUF_SIZE; // advance the head of the queue
if (ConsoleRxBufHead == ConsoleRxBufTail)
{ // if the buffer has overflowed
ConsoleRxBufTail = (ConsoleRxBufTail + 1) % CONSOLE_RX_BUF_SIZE; // throw away the oldest char
}
}
}
}
// } else readover=1;
}
return;
i2c_error_exit:
if(noerror){
noI2C=1;
return;
}
if(CurrentLinePtr) error("I2C Keyboard not responding");
if(Option.KeyboardConfig==CONFIG_I2C){
MMPrintString("I2C Keyboard not responding");
MMPrintString("\r\n");
}
}
#endif
void RtcGetTime(int noerror) {
char *buff=GetTempMemory(STRINGSIZE); // Received data is stored here
int DS1307;
if(I2C0locked){
I2C_Sendlen = 1; // send one byte
I2C_Rcvlen = 0;
I2C_Status = 0;
I2C_Send_Buffer[0] = 0; // the first register to read
if(!(DS1307 = DoRtcI2C(0x68, NULL))) {
I2C_Send_Buffer[0] = 2; // the first register is different for the PCF8563
if(!DoRtcI2C(0x51, NULL)) goto error_exit;
}
I2C_Rcvbuf_String = buff; // we want a string of bytes
I2C_Rcvbuf_Float = NULL;
I2C_Rcvbuf_Int = NULL;
I2C_Rcvlen = 7; // get 7 bytes
I2C_Sendlen = 0;
if(!DoRtcI2C(DS1307 ? 0x68 : 0x51, (unsigned char *)buff)) goto error_exit;
} else {
I2C2_Sendlen = 1; // send one byte
I2C2_Rcvlen = 0;
I2C2_Status = 0;
I2C_Send_Buffer[0] = 0; // the first register to read
if(!(DS1307 = DoRtcI2C(0x68,NULL))) {
I2C_Send_Buffer[0] = 2; // the first register is different for the PCF8563
if(!DoRtcI2C(0x51,NULL)) goto error_exit;
}
I2C2_Rcvbuf_String = buff; // we want a string of bytes
I2C2_Rcvbuf_Float = NULL;
I2C2_Rcvbuf_Int = NULL;
I2C2_Rcvlen = 7; // get 7 bytes
I2C2_Sendlen = 0;
if(!DoRtcI2C(DS1307 ? 0x68 : 0x51, (unsigned char *)buff)) goto error_exit;
}
mT4IntEnable(0);
second = ((buff[0] & 0x7f) >> 4) * 10 + (buff[0] & 0x0f);
minute = ((buff[1] & 0x7f) >> 4) * 10 + (buff[1] & 0x0f);
hour = ((buff[2] & 0x3f) >> 4) * 10 + (buff[2] & 0x0f);
day = ((buff[DS1307 ? 4:3] & 0x3f) >> 4) * 10 + (buff[DS1307 ? 4:3] & 0x0f);
month = ((buff[5] & 0x1f) >> 4) * 10 + (buff[5] & 0x0f);
year = (buff[6] >> 4) * 10 + (buff[6] & 0x0f) + 2000;
mT4IntEnable(1);
return;
error_exit:
if(noerror){
noRTC=1;
return;
}
if(CurrentLinePtr) error("RTC not responding");
if(Option.RTC){
MMPrintString("RTC not responding");
MMPrintString("\r\n");
}
}
// universal function to send/receive data to/from the RTC
// addr is the I2C address WITHOUT the read/write bit
char CvtToBCD(unsigned char *p, int min, int max) {
long long int t;
t = getint(p, min, max) % 100;
return ((t / 10) << 4) | (t % 10);
}
char CvtCharsToBCD(unsigned char *p, int min, int max) {
int t;
t = (p[0] - '0') * 10 + (p[1] - '0');
// dp("|%c| |%c| %d %d %d", p[0], p[1], t, min, max);
if(!isdigit(p[0]) || !isdigit(p[1]) || t < min || t > max) error("Date/time format");
return ((t / 10) << 4) | (t % 10);
}
void MIPS16 cmd_rtc(void) {
char buff[7]; // Received data is stored here
int DS1307;
unsigned char *p;
void *ptr = NULL;
if(!(I2C0locked || I2C1locked))error("SYSTEM I2C not configured");
if(checkstring(cmdline, (unsigned char *)"GETTIME")) {
RtcGetTime(0);
return;
}
if((p = checkstring(cmdline, (unsigned char *)"SETTIME")) != NULL) {
int Fulldate=0;
getargs(&p, 11, (unsigned char *)",");
if(I2C0locked){
if(argc == 1) {
// single argument - assume the data is in DATETIME2 format used by GUI FORMATBOX
p = getCstring(argv[0]);
if(!(p[2] == '/' || p[2] == '-' )|| !(p[11] == ':' || p[13] == ':')) error("Date/time format");
if(p[13] == ':')Fulldate=2;
if(p[14 + Fulldate] == ':')
I2C_Send_Buffer[1] = CvtCharsToBCD(p + 15 + Fulldate, 0, 59); // seconds
else
I2C_Send_Buffer[1] = 0; // seconds defaults to zero
I2C_Send_Buffer[2] = CvtCharsToBCD(p + 12 + Fulldate, 0, 59); // minutes
I2C_Send_Buffer[3] = CvtCharsToBCD(p + 9 + Fulldate, 0, 23); // hour
I2C_Send_Buffer[5] = CvtCharsToBCD(p, 1, 31); // day
I2C_Send_Buffer[6] = CvtCharsToBCD(p + 3, 1, 12); // month
I2C_Send_Buffer[7] = CvtCharsToBCD(p + 6 + Fulldate, 0, 99); // year
} else {
// multiple arguments - data should be in the original yy, mm, dd, etc format
if(argc != 11) error("Argument count");
I2C_Send_Buffer[1] = CvtToBCD(argv[10], 0, 59); // seconds
I2C_Send_Buffer[2] = CvtToBCD(argv[8], 0, 59); // minutes
I2C_Send_Buffer[3] = CvtToBCD(argv[6], 0, 23); // hour
I2C_Send_Buffer[5] = CvtToBCD(argv[4], 1, 31); // day
I2C_Send_Buffer[6] = CvtToBCD(argv[2], 1, 12); // month
I2C_Send_Buffer[7] = CvtToBCD(argv[0], 0, 2099); // year
}
I2C_Send_Buffer[0] = 0; // turn off the square wave
I2C_Send_Buffer[4] = 1;
I2C_Rcvlen = 0;
I2C_Sendlen = 9; // send 7 bytes
if(!DoRtcI2C(0x68, NULL)) {
I2C_Send_Buffer[9] = I2C_Send_Buffer[7]; // year
I2C_Send_Buffer[8] = I2C_Send_Buffer[6]; // month
I2C_Send_Buffer[7] = 1;
I2C_Send_Buffer[6] = I2C_Send_Buffer[5]; // day
I2C_Send_Buffer[5] = I2C_Send_Buffer[3]; // hour
I2C_Send_Buffer[4] = I2C_Send_Buffer[2]; // minutes
I2C_Send_Buffer[3] = I2C_Send_Buffer[1]; // seconds
I2C_Send_Buffer[0] = I2C_Send_Buffer[1] = I2C_Send_Buffer[2] = 0; // set the register pointer to the first register then zero the first two registers
I2C_Sendlen = 10; // send 10 bytes
if(!DoRtcI2C(0x51, NULL)) error("RTC not responding");
}
} else {
if(argc == 1) {
// single argument - assume the data is in DATETIME2 format used by GUI FORMATBOX
p = getCstring(argv[0]);
if(!(p[2] == '/' || p[2] == '-' )|| !(p[11] == ':' || p[13] == ':')) error("Date/time format");
if(p[13] == ':')Fulldate=2;
if(p[14 + Fulldate] == ':')
I2C_Send_Buffer[1] = CvtCharsToBCD(p + 15 + Fulldate, 0, 59); // seconds
else
I2C_Send_Buffer[1] = 0; // seconds defaults to zero
I2C_Send_Buffer[2] = CvtCharsToBCD(p + 12 + Fulldate, 0, 59); // minutes
I2C_Send_Buffer[3] = CvtCharsToBCD(p + 9 + Fulldate, 0, 23); // hour
I2C_Send_Buffer[5] = CvtCharsToBCD(p, 1, 31); // day
I2C_Send_Buffer[6] = CvtCharsToBCD(p + 3, 1, 12); // month
I2C_Send_Buffer[7] = CvtCharsToBCD(p + 6 + Fulldate, 0, 99); // year
} else {
// multiple arguments - data should be in the original yy, mm, dd, etc format
if(argc != 11) error("Argument count");
I2C_Send_Buffer[1] = CvtToBCD(argv[10], 0, 59); // seconds
I2C_Send_Buffer[2] = CvtToBCD(argv[8], 0, 59); // minutes
I2C_Send_Buffer[3] = CvtToBCD(argv[6], 0, 23); // hour
I2C_Send_Buffer[5] = CvtToBCD(argv[4], 1, 31); // day
I2C_Send_Buffer[6] = CvtToBCD(argv[2], 1, 12); // month
I2C_Send_Buffer[7] = CvtToBCD(argv[0], 0, 2099); // year
}
I2C_Send_Buffer[0] = 0; // turn off the square wave
I2C_Send_Buffer[4] = 1;
I2C2_Rcvlen = 0;
I2C2_Sendlen = 9; // send 7 bytes
if(!DoRtcI2C(0x68, NULL)) {
I2C_Send_Buffer[9] = I2C_Send_Buffer[7]; // year
I2C_Send_Buffer[8] = I2C_Send_Buffer[6]; // month
I2C_Send_Buffer[7] = 1;
I2C_Send_Buffer[6] = I2C_Send_Buffer[5]; // day
I2C_Send_Buffer[5] = I2C_Send_Buffer[3]; // hour
I2C_Send_Buffer[4] = I2C_Send_Buffer[2]; // minutes
I2C_Send_Buffer[3] = I2C_Send_Buffer[1]; // seconds
I2C_Send_Buffer[0] = I2C_Send_Buffer[1] = I2C_Send_Buffer[2] = 0; // set the register pointer to the first register then zero the first two registers
I2C2_Sendlen = 10; // send 10 bytes
if(!DoRtcI2C(0x51, NULL)) error("RTC not responding");
}
}
RtcGetTime(0);
} else if((p = checkstring(cmdline, (unsigned char *)"GETREG")) != NULL) {
getargs(&p, 3, (unsigned char *)",");
if(argc != 3) error("Argument count");
if(I2C0locked){
I2C_Sendlen = 1; // send one byte
I2C_Rcvlen = 0;
*I2C_Send_Buffer = getint(argv[0], 0, 255); // the register to read
} else {
I2C2_Sendlen = 1; // send one byte
I2C2_Rcvlen = 0;
*I2C_Send_Buffer = getint(argv[0], 0, 255); // the register to read
}
ptr = findvar(argv[2], V_FIND);
if(vartbl[VarIndex].type & T_CONST) error("Cannot change a constant");
if(vartbl[VarIndex].type & T_STR) error("Invalid variable");
if(!(DS1307 = DoRtcI2C(0x68, NULL))) {
if(!DoRtcI2C(0x51, NULL)) error("RTC not responding");
}
if(I2C0locked){
I2C_Rcvbuf_String = buff; // we want a string of bytes
I2C_Rcvbuf_Float = NULL;
I2C_Rcvbuf_Int = NULL;
I2C_Rcvlen = 1; // get 1 byte
I2C_Sendlen = 0;
} else {
I2C2_Rcvbuf_String = buff; // we want a string of bytes
I2C2_Rcvbuf_Float = NULL;
I2C2_Rcvbuf_Int = NULL;
I2C2_Rcvlen = 1; // get 1 byte
I2C2_Sendlen = 0;
}
if(!DoRtcI2C(DS1307 ? 0x68 : 0x51, (unsigned char *)buff)) error("RTC not responding1");
if(vartbl[VarIndex].type & T_NBR)
*(MMFLOAT *)ptr = buff[0];
else
*(long long int *)ptr = buff[0];
} else if((p = checkstring(cmdline, (unsigned char *)"SETREG")) != NULL) {
getargs(&p, 3, (unsigned char *)",");
if(argc != 3) error("Argument count");
if(I2C0locked){
I2C_Rcvlen = 0;
I2C_Send_Buffer[0] = getint(argv[0], 0, 255); // set the register pointer
I2C_Send_Buffer[1] = getint(argv[2], 0, 255); // and the data to be written
I2C_Sendlen = 2; // send 2 bytes
} else {
I2C2_Rcvlen = 0;
I2C_Send_Buffer[0] = getint(argv[0], 0, 255); // set the register pointer
I2C_Send_Buffer[1] = getint(argv[2], 0, 255); // and the data to be written
I2C2_Sendlen = 2; // send 2 bytes
}
if(!DoRtcI2C(0x68, NULL)) {
if(!DoRtcI2C(0x51, NULL)) error("RTC not responding");
}
} else
error("Unknown command");
}
// enable the I2C1 module - master mode
void i2cEnable(unsigned char *p) {
int speed, timeout;
getargs(&p, 3, (unsigned char *)",");
if(argc != 3) error("Invalid syntax");
speed = getinteger(argv[0]);
if(!(speed ==100 || speed == 400)) error("Valid speeds 100, 400");
timeout = getinteger(argv[2]);
if(timeout < 0 || (timeout > 0 && timeout < 100)) error("Number out of bounds" );
if(I2C_enabled || I2C_Status & I2C_Status_Slave) error("I2C already OPEN");
I2C_Timeout = timeout;
i2c_enable(speed);
}
// enable the I2C1 module - master mode
void i2c2Enable(unsigned char *p) {
int speed, timeout;
getargs(&p, 3, (unsigned char *)",");
if(argc != 3) error("Invalid syntax");
speed = getinteger(argv[0]);
if(!(speed ==100 || speed == 400)) error("Valid speeds 100, 400");
timeout = getinteger(argv[2]);
if(timeout < 0 || (timeout > 0 && timeout < 100)) error("Number out of bounds" );
if(I2C2_enabled || I2C2_Status & I2C_Status_Slave) error("I2C already OPEN");
I2C2_Timeout = timeout;
i2c2_enable(speed);
}
// disable the I2C1 module - master mode
void i2cDisable(unsigned char *p) {
if(!I2C0locked) i2c_disable();
else error("Allocated to System I2C");
}
// disable the I2C1 module - master mode
void i2c2Disable(unsigned char *p) {
if(!I2C1locked) i2c2_disable();
else error("Allocated to System I2C");
}
// send data to an I2C slave - master mode
void i2cSend(unsigned char *p) {
int addr, i2c_options, sendlen, i;
void *ptr = NULL;
unsigned char *cptr = NULL;
getargs(&p, 99, (unsigned char *)",");
if(!(argc & 0x01) || (argc < 7)) error("Invalid syntax");
if(!I2C_enabled)error("I2C not open");
addr = getinteger(argv[0]);
i2c_options = getinteger(argv[2]);
if(i2c_options < 0 || i2c_options > 3) error("Number out of bounds");
I2C_Status = 0;
if(i2c_options & 0x01) I2C_Status = I2C_Status_BusHold;
I2C_Addr = addr;
sendlen = getinteger(argv[4]);
if(sendlen < 1 || sendlen > 255) error("Number out of bounds");
if(sendlen == 1 || argc > 7) { // numeric expressions for data
if(sendlen != ((argc - 5) >> 1)) error("Incorrect argument count");
for (i = 0; i < sendlen; i++) {
I2C_Send_Buffer[i] = getinteger(argv[i + i + 6]);
}
} else { // an array of MMFLOAT, integer or a string
ptr = findvar(argv[6], V_NOFIND_NULL | V_EMPTY_OK);
if(ptr == NULL) error("Invalid variable");
if((vartbl[VarIndex].type & T_STR) && vartbl[VarIndex].dims[0] == 0) { // string
cptr = (unsigned char *)ptr;
cptr++; // skip the length byte in a MMBasic string
for (i = 0; i < sendlen; i++) {
I2C_Send_Buffer[i] = (int)(*(cptr + i));
}
} else if((vartbl[VarIndex].type & T_NBR) && vartbl[VarIndex].dims[0] > 0 && vartbl[VarIndex].dims[1] == 0) { // numeric array
if( (((MMFLOAT *)ptr - vartbl[VarIndex].val.fa) + sendlen) > (vartbl[VarIndex].dims[0] + 1 - OptionBase) ) {
error("Insufficient data");
} else {
for (i = 0; i < sendlen; i++) {
I2C_Send_Buffer[i] = (int)(*((MMFLOAT *)ptr + i));
}
}
} else if((vartbl[VarIndex].type & T_INT) && vartbl[VarIndex].dims[0] > 0 && vartbl[VarIndex].dims[1] == 0) { // integer array
if( (((long long int *)ptr - vartbl[VarIndex].val.ia) + sendlen) > (vartbl[VarIndex].dims[0] + 1 - OptionBase) ) {
error("Insufficient data");
} else {
for (i = 0; i < sendlen; i++) {
I2C_Send_Buffer[i] = (int)(*((long long int *)ptr + i));
}
}
} else error("Invalid variable");
}
I2C_Sendlen = sendlen;
I2C_Rcvlen = 0;
i2c_masterCommand(1,NULL);
}
// send data to an I2C slave - master mode
void i2cSendSlave(unsigned char *p, int channel) {
int sendlen, i;
void *ptr = NULL;
unsigned char *cptr = NULL;
getargs(&p, 99, (unsigned char *)",");
if(!(argc >=3)) error("Invalid syntax");
if(!((I2C_Status & I2C_Status_Slave && channel==0) || (I2C2_Status & I2C_Status_Slave && channel==1)))error("I2C slave not open");
unsigned char *bbuff;
if(channel==0){
bbuff=I2C_Send_Buffer;
} else {
bbuff=I2C_Send_Buffer;
}
sendlen = getinteger(argv[0]);
if(sendlen < 1 || sendlen > 255) error("Number out of bounds");
if(sendlen == 1 || argc > 3) { // numeric expressions for data
if(sendlen != ((argc - 1) >> 1)) error("Incorrect argument count");
for (i = 0; i < sendlen; i++) {
bbuff[i] = getinteger(argv[i + i + 2]);
}
} else { // an array of MMFLOAT, integer or a string
ptr = findvar(argv[2], V_NOFIND_NULL | V_EMPTY_OK);
if(ptr == NULL) error("Invalid variable");
if((vartbl[VarIndex].type & T_STR) && vartbl[VarIndex].dims[0] == 0) { // string
cptr = (unsigned char *)ptr;
cptr++; // skip the length byte in a MMBasic string
for (i = 0; i < sendlen; i++) {
bbuff[i] = (int)(*(cptr + i));
}
} else if((vartbl[VarIndex].type & T_NBR) && vartbl[VarIndex].dims[0] > 0 && vartbl[VarIndex].dims[1] == 0) { // numeric array
if( (((MMFLOAT *)ptr - vartbl[VarIndex].val.fa) + sendlen) > (vartbl[VarIndex].dims[0] + 1 - OptionBase) ) {
error("Insufficient data");
} else {
for (i = 0; i < sendlen; i++) {
bbuff[i] = (int)(*((MMFLOAT *)ptr + i));
}
}
} else if((vartbl[VarIndex].type & T_INT) && vartbl[VarIndex].dims[0] > 0 && vartbl[VarIndex].dims[1] == 0) { // integer array
if( (((long long int *)ptr - vartbl[VarIndex].val.ia) + sendlen) > (vartbl[VarIndex].dims[0] + 1 - OptionBase) ) {
error("Insufficient data");
} else {
for (i = 0; i < sendlen; i++) {
bbuff[i] = (int)(*((long long int *)ptr + i));
}
}
} else error("Invalid variable");
}
if(channel==0)i2c_write_raw_blocking(i2c0, bbuff, sendlen);
else i2c_write_raw_blocking(i2c1, bbuff, sendlen);
}
// send data to an I2C slave - master mode
void i2c2Send(unsigned char *p) {
int addr, i2c2_options, sendlen, i;
void *ptr = NULL;
unsigned char *cptr = NULL;
getargs(&p, 99, (unsigned char *)",");
if(!(argc & 0x01) || (argc < 7)) error("Invalid syntax");
if(!I2C2_enabled)error("I2C not open");
addr = getinteger(argv[0]);
i2c2_options = getinteger(argv[2]);
if(i2c2_options < 0 || i2c2_options > 3) error("Number out of bounds");
I2C2_Status = 0;
if(i2c2_options & 0x01) I2C2_Status = I2C_Status_BusHold;
I2C2_Addr = addr;
sendlen = getinteger(argv[4]);
if(sendlen < 1 || sendlen > 255) error("Number out of bounds");
if(sendlen == 1 || argc > 7) { // numeric expressions for data
if(sendlen != ((argc - 5) >> 1)) error("Incorrect argument count");
for (i = 0; i < sendlen; i++) {
I2C_Send_Buffer[i] = getinteger(argv[i + i + 6]);
}
} else { // an array of MMFLOAT, integer or a string
ptr = findvar(argv[6], V_NOFIND_NULL | V_EMPTY_OK);
if(ptr == NULL) error("Invalid variable");
if((vartbl[VarIndex].type & T_STR) && vartbl[VarIndex].dims[0] == 0) { // string
cptr = (unsigned char *)ptr;
cptr++; // skip the length byte in a MMBasic string
for (i = 0; i < sendlen; i++) {
I2C_Send_Buffer[i] = (int)(*(cptr + i));
}
} else if((vartbl[VarIndex].type & T_NBR) && vartbl[VarIndex].dims[0] > 0 && vartbl[VarIndex].dims[1] == 0) { // numeric array
if( (((MMFLOAT *)ptr - vartbl[VarIndex].val.fa) + sendlen) > (vartbl[VarIndex].dims[0] + 1 - OptionBase) ) {
error("Insufficient data");
} else {
for (i = 0; i < sendlen; i++) {
I2C_Send_Buffer[i] = (int)(*((MMFLOAT *)ptr + i));
}
}
} else if((vartbl[VarIndex].type & T_INT) && vartbl[VarIndex].dims[0] > 0 && vartbl[VarIndex].dims[1] == 0) { // integer array
if( (((long long int *)ptr - vartbl[VarIndex].val.ia) + sendlen) > (vartbl[VarIndex].dims[0] + 1 - OptionBase) ) {
error("Insufficient data");
} else {
for (i = 0; i < sendlen; i++) {
I2C_Send_Buffer[i] = (int)(*((long long int *)ptr + i));
}
}
} else error("Invalid variable");
}
I2C2_Sendlen = sendlen;
I2C2_Rcvlen = 0;
i2c2_masterCommand(1, NULL);
}
void i2cCheck(unsigned char *p) {
int addr;
uint8_t rxdata;
getargs(&p, 1, (unsigned char *)",");
if(!I2C_enabled)error("I2C not open");
addr = getinteger(argv[0]);
if(addr<0 || addr>0x7F)error("Invalid I2C address");
int ret=i2c_read_blocking(i2c0, addr, &rxdata, 1, false);
mmI2Cvalue = ret < 0 ? 1 : 0;
}
void i2c2Check(unsigned char *p) {
int addr;
uint8_t rxdata;
getargs(&p, 1, (unsigned char *)",");
if(!I2C2_enabled)error("I2C not open");
addr = getinteger(argv[0]);
if(addr<0 || addr>0x7F)error("Invalid I2C address");
int ret=i2c_read_blocking(i2c1, addr, &rxdata, 1, false);
mmI2Cvalue = ret < 0 ? 1 : 0;
}
// receive data from an I2C slave - master mode
void i2cReceive(unsigned char *p) {
int addr, i2c_options, rcvlen;
void *ptr = NULL;
getargs(&p, 7, (unsigned char *)",");
if(argc != 7) error("Invalid syntax");
if(!I2C_enabled)error("I2C not open");
addr = getinteger(argv[0]);
i2c_options = getint(argv[2],0,1);
I2C_Status = 0;
I2C_Rcvbuf_Float = NULL;
I2C_Rcvbuf_Int = NULL;
I2C_Rcvbuf_String = NULL;
if(i2c_options & 0x01) I2C_Status = I2C_Status_BusHold;
I2C_Addr = addr;
rcvlen = getinteger(argv[4]);
if(rcvlen < 1) error("Number out of bounds");
ptr = findvar(argv[6], V_FIND | V_EMPTY_OK);
if(vartbl[VarIndex].type & T_CONST) error("Cannot change a constant");
if(ptr == NULL) error("Invalid variable");
if(vartbl[VarIndex].type & T_NBR) {
if(vartbl[VarIndex].dims[1] != 0) error("Invalid variable");
if(vartbl[VarIndex].dims[0] <= 0) { // Not an array
if(rcvlen != 1) error("Invalid variable");
} else { // An array
if( (((MMFLOAT *)ptr - vartbl[VarIndex].val.fa) + rcvlen) > (vartbl[VarIndex].dims[0] + 1 - OptionBase) )
error("Insufficient space in array");
}
I2C_Rcvbuf_Float = (MMFLOAT*)ptr;
} else if(vartbl[VarIndex].type & T_INT) {
if(vartbl[VarIndex].dims[1] != 0) error("Invalid variable");
if(vartbl[VarIndex].dims[0] <= 0) { // Not an array
if(rcvlen != 1) error("Invalid variable");
} else { // An array
if( (((long long int *)ptr - vartbl[VarIndex].val.ia) + rcvlen) > (vartbl[VarIndex].dims[0] + 1 - OptionBase) )
error("Insufficient space in array");
}
I2C_Rcvbuf_Int = (long long int *)ptr;
} else if(vartbl[VarIndex].type & T_STR) {
if(rcvlen < 1 || rcvlen > 255) error("Number out of bounds");
if(vartbl[VarIndex].dims[0] != 0) error("Invalid variable");
*(char *)ptr = rcvlen;
I2C_Rcvbuf_String = (char *)ptr + 1;
} else error("Invalid variable");
I2C_Rcvlen = rcvlen;
I2C_Sendlen = 0;
char *buff=GetTempMemory(STRINGSIZE);
// PInt((uint32_t)I2C_Rcvbuf_String);
i2c_masterCommand(1, (unsigned char *)buff);
// PIntComma(rcvlen);
// PInt((uint32_t)I2C_Rcvbuf_String);PRet();
// if(vartbl[VarIndex].type & T_STR)*(char *)ptr = rcvlen;
}
void i2cReceiveSlave(unsigned char *p, int channel) {
int rcvlen;
void *ptr = NULL;
MMFLOAT *rcvdlenFloat=NULL;
long long int *rcvdlenInt=NULL;
int count=1;
I2C_Rcvbuf_Float = NULL;
I2C_Rcvbuf_Int = NULL;
I2C_Rcvbuf_String = NULL;
I2C2_Rcvbuf_Float = NULL;
I2C2_Rcvbuf_Int = NULL;
I2C2_Rcvbuf_String = NULL;
getargs(&p, 5, (unsigned char *)",");
if(argc != 5) error("Invalid syntax");
if(!((I2C_Status & I2C_Status_Slave && channel==0) || (I2C2_Status & I2C_Status_Slave && channel==1)))error("I2C slave not open");
rcvlen = getinteger(argv[0]);
if(rcvlen < 1 || rcvlen > 255) error("Number out of bounds");
ptr = findvar(argv[2], V_FIND | V_EMPTY_OK);
if(vartbl[VarIndex].type & T_CONST) error("Cannot change a constant");
if(ptr == NULL) error("Invalid variable");
if(vartbl[VarIndex].type & T_NBR) {
if(vartbl[VarIndex].dims[1] != 0) error("Invalid variable");
if(vartbl[VarIndex].dims[0] <= 0) { // Not an array
if(rcvlen != 1) error("Invalid variable");
} else { // An array
if( (((MMFLOAT *)ptr - vartbl[VarIndex].val.fa) + rcvlen) > (vartbl[VarIndex].dims[0] + 1 - OptionBase) )
error("Insufficient space in array");
}
I2C_Rcvbuf_Float = (MMFLOAT*)ptr;
} else if(vartbl[VarIndex].type & T_INT) {
if(vartbl[VarIndex].dims[1] != 0) error("Invalid variable");
if(vartbl[VarIndex].dims[0] <= 0) { // Not an array
if(rcvlen != 1) error("Invalid variable");
} else { // An array
if( (((long long int *)ptr - vartbl[VarIndex].val.ia) + rcvlen) > (vartbl[VarIndex].dims[0] + 1 - OptionBase) )
error("Insufficient space in array");
}
I2C_Rcvbuf_Int = (long long int *)ptr;
} else if(vartbl[VarIndex].type & T_STR) {
if(vartbl[VarIndex].dims[0] != 0) error("Invalid variable");
*(char *)ptr = rcvlen;
I2C_Rcvbuf_String = (char *)ptr + 1;