// ============================================================================
signed char fDetectHiLoTransition(void)
{
// nTimer breaks out of the while loops if the wait in the two loops totals
// more than 100 msec. Making this static makes the loop run a faster.
// This is really a processor/compiler dependency and it not needed.
unsigned long int iTimer=0;
// NOTE:
// These loops look unconventional, but it is necessary to check SDATA_PIN
// as shown because the transition can be missed otherwise, due to the
// length of the SDATA Low-High-Low after certain commands.
// Generate clocks for the target to pull SDATA High
iTimer = TRANSITION_TIMEOUT;
// gpio_tlmm_config(GPIO_CFG(TSP_SDA, 0, GPIO_CFG_INPUT, GPIO_CFG_NO_PULL,
// GPIO_CFG_2MA), GPIO_CFG_ENABLE);
gpio_direction_input(TSP_SDA);
while(1)
{
SCLKLow();
if (fSDATACheck()) // exit once SDATA goes HI
{
break;
}
SCLKHigh();
// If the wait is too long then timeout
if (iTimer-- == 0) {
printk(KERN_INFO "[TSP] %s, %d : Error\n", __func__, __LINE__);
return (ERROR);
}
}
// Generate Clocks and wait for Target to pull SDATA Low again
iTimer = TRANSITION_TIMEOUT; // reset the timeout counter
while(1)
{
SCLKLow();
if (!fSDATACheck()) // exit once SDATA returns LOW
{
break;
}
SCLKHigh();
// If the wait is too long then timeout
if (iTimer-- == 0) {
printk(KERN_INFO "[TSP] %s, %d : Error\n", __func__, __LINE__);
return (ERROR);
}
}
return (PASS);
}
// ============================================================================
// fDetectHiLoTransition()
// Waits for transition from SDATA = 1 to SDATA = 0. Has a 100 msec timeout.
// TRANSITION_TIMEOUT is a loop counter for a 100msec timeout when waiting for
// a high-to-low transition. This is used in the polling loop of
// fDetectHiLoTransition(). The timing of the while(1) loops can be calculated
// and the number of loops is counted, using iTimer, to determine when 100
// msec has passed.
//
//// SCLK cannot run faster than the specified maximum frequency of 8MHz. Some
// processors may need to have delays added after setting SCLK low and setting
// SCLK high in order to not exceed this specification. The maximum frequency
// of SCLK should be measured as part of validation of the final program
//
// Returns:
// 0 if successful
// -1 if timed out.
// ============================================================================
signed char fDetectHiLoTransition(void)
{
// nTimer breaks out of the while loops if the wait in the two loops totals
// more than 100 msec. Making this static makes the loop run a faster.
// This is really a processor/compiler dependency and it not needed.
static unsigned int iTimer;
// NOTE:
// These loops look unconventional, but it is necessary to check SDATA_PIN
// as shown because the transition can be missed otherwise, due to the
// length of the SDATA Low-High-Low after certain commands.
// Generate clocks for the target to pull SDATA High
//dog_kick();
iTimer = TRANSITION_TIMEOUT;
#if !defined(CONFIG_TARGET_LOCALE_NAATT)
printk(KERN_DEBUG
"Generate clocks for the target to pull SDATA High\n");
#endif
while (1) {
SCLKLow();
if (fSDATACheck()) // exit once SDATA goes HI
break;
SCLKHigh();
// If the wait is too long then timeout
if (iTimer-- == 0) {
return (ERROR);
}
}
//dog_kick();
// Generate Clocks and wait for Target to pull SDATA Low again
iTimer = TRANSITION_TIMEOUT; // reset the timeout counter
#if !defined(CONFIG_TARGET_LOCALE_NAATT)
printk(KERN_DEBUG
"Generate Clocks and wait for Target to pull SDATA Low again\n");
#endif
while (1) {
SCLKLow(); //issp_test_20100709 unblock
if (!fSDATACheck()) { // exit once SDATA returns LOW
break;
}
SCLKHigh(); //issp_test_20100709 unblock
// If the wait is too long then timeout
if (iTimer-- == 0) {
return (ERROR);
}
}
#if !defined(CONFIG_TARGET_LOCALE_NAATT)
printk(KERN_ERR"fDetectHiLoTransition OUT!!!!\n");
#endif
return (PASS);
}
/*
============================================================================
SendByte()
This routine sends up to one byte of a vector, one bit at a time.
bCurrByte the byte that contains the bits to be sent.
bSize the number of bits to be sent. Valid values are 1 to 8.
SCLK cannot run faster than the specified maximum frequency of 8MHz. Some
processors may need to have delays added after setting SCLK low and setting
SCLK high in order to not exceed this specification. The maximum frequency
of SCLK should be measured as part of validation of the final program
There is no returned value.
============================================================================
*/
void SendByte(unsigned char bCurrByte, unsigned char bSize)
{
unsigned char b = 0;
for (b = 0; b < bSize; b++) {
if (bCurrByte & 0x80) {
SetSDATAHigh();
SCLKHigh();
SCLKLow();
} else {
SetSDATALow();
SCLKHigh();
SCLKLow();
}
bCurrByte = bCurrByte << 1;
}
}
/*============================================================================
bReceiveBit()
Clocks the SCLK pin (high-low-high) and reads the status of the SDATA pin
after the rising edge.
SCLK cannot run faster than the specified maximum frequency of 8MHz. Some
processors may need to have delays added after setting SCLK low and setting
SCLK high in order to not exceed this specification. The maximum frequency
of SCLK should be measured as part of validation of the final program
Returns:
0 if SDATA was low
1 if SDATA was high
============================================================================
*/
unsigned char bReceiveBit(void)
{
SCLKLow();
SCLKHigh();
if (fSDATACheck())
return 1;
else
return 0;
}
/*============================================================================
RunClock()
Description:
Run Clock without sending/receiving bits. Use this when transitioning from
write to read and read to write "num_cycles" is number of SCLK cycles, not
number of counter cycles.
SCLK cannot run faster than the specified maximum frequency of 8MHz. Some
processors may need to have delays added after setting SCLK low and setting
SCLK high in order to not exceed this specification. The maximum frequency
of SCLK should be measured as part of validation of the final program
============================================================================
*/
void RunClock(unsigned int iNumCycles)
{
int i;
for (i = 0; i < iNumCycles; i++) {
SCLKLow();
SCLKHigh();
}
}
// ============================================================================
// RunClock()
// Description:
// Run Clock without sending/receiving bits. Use this when transitioning from
// write to read and read to write "num_cycles" is number of SCLK cycles, not
// number of counter cycles.
//
// SCLK cannot run faster than the specified maximum frequency of 8MHz. Some
// processors may need to have delays added after setting SCLK low and setting
// SCLK high in order to not exceed this specification. The maximum frequency
// of SCLK should be measured as part of validation of the final program
//
// ============================================================================
void RunClock(unsigned int iNumCycles)
{
int i;
for (i = 0; i < iNumCycles; i++) {
SCLKLow();
SCLKHigh();
}
// function exits with CLK high.
}
// ============================================================================
// bReceiveBit()
// Clocks the SCLK pin (high-low-high) and reads the status of the SDATA pin
// after the rising edge.
//
// SCLK cannot run faster than the specified maximum frequency of 8MHz. Some
// processors may need to have delays added after setting SCLK low and setting
// SCLK high in order to not exceed this specification. The maximum frequency
// of SCLK should be measured as part of validation of the final program
//
// Returns:
// 0 if SDATA was low
// 1 if SDATA was high
// ============================================================================
unsigned char bReceiveBit(void)
{
SCLKLow();
SCLKHigh();
if (fSDATACheck()) {
return (1);
} else {
return (0);
}
}
// ============================================================================
// fDetectHiLoTransition()
// Waits for transition from SDATA = 1 to SDATA = 0. Has a 100 msec timeout.
// TRANSITION_TIMEOUT is a loop counter for a 100msec timeout when waiting for
// a high-to-low transition. This is used in the polling loop of
// fDetectHiLoTransition(). The timing of the while(1) loops can be calculated
// and the number of loops is counted, using iTimer, to determine when 100
// msec has passed.
//
// SCLK cannot run faster than the specified maximum frequency of 8MHz. Some
// processors may need to have delays added after setting SCLK low and setting
// SCLK high in order to not exceed this specification. The maximum frequency
// of SCLK should be measured as part of validation of the final program
//
// Returns:
// 0 if successful
// -1 if timed out.
// ============================================================================
signed char fDetectHiLoTransition(void)
{
// nTimer breaks out of the while loops if the wait in the two loops totals
// more than 100 msec. Making this static makes the loop run a faster.
// This is really a processor/compiler dependency and it not needed.
unsigned long int iTimer=0;
// NOTE:
// These loops look unconventional, but it is necessary to check SDATA_PIN
// as shown because the transition can be missed otherwise, due to the
// length of the SDATA Low-High-Low after certain commands.
// Generate clocks for the target to pull SDATA High
iTimer = TRANSITION_TIMEOUT;
while(1)
{
SCLKLow();
if (fSDATACheck()) // exit once SDATA goes HI
break;
SCLKHigh();
// If the wait is too long then timeout
if (iTimer-- == 0) {
return (ERROR);
}
}
// Generate Clocks and wait for Target to pull SDATA Low again
iTimer = TRANSITION_TIMEOUT; // reset the timeout counter
while(1)
{
SCLKLow();
if (!fSDATACheck()) { // exit once SDATA returns LOW
break;
}
SCLKHigh();
// If the wait is too long then timeout
if (iTimer-- == 0) {
return (ERROR);
}
}
return (PASS);
}
/*
============================================================================
fDetectHiLoTransition()
Waits for transition from SDATA = 1 to SDATA = 0. Has a 100 msec timeout.
TRANSITION_TIMEOUT is a loop counter for a 100msec timeout when waiting for
a high-to-low transition. This is used in the polling loop of
fDetectHiLoTransition(). The timing of the while(1) loops can be calculated
and the number of loops is counted, using iTimer, to determine when 100
msec has passed.
SCLK cannot run faster than the specified maximum frequency of 8MHz. Some
processors may need to have delays added after setting SCLK low and setting
SCLK high in order to not exceed this specification. The maximum frequency
of SCLK should be measured as part of validation of the final program
Returns:
0 if successful
-1 if timed out.
============================================================================
*/
signed char fDetectHiLoTransition(void)
{
/* nTimer breaks out of the while loops if the wait in the two loops totals
more than 100 msec. Making this static makes the loop run a faster.
This is really a processor/compiler dependency and it not needed.
*/
unsigned long int iTimer = 0;
/* NOTE:
These loops look unconventional, but it is necessary to check SDATA_PIN
as shown because the transition can be missed otherwise, due to the
length of the SDATA Low-High-Low after certain commands.
Generate clocks for the target to pull SDATA High
*/
iTimer = TRANSITION_TIMEOUT;
SetSCLKStrong();
while (1) {
SCLKLow();
/* Delay(CLK_DELAY); */
if (fSDATACheck()) /* exit once SDATA goes HI */
break;
SCLKHigh();
/*Delay(CLK_DELAY);*/
/*If the wait is too long then timeout*/
if (iTimer-- == 0){
printk(KERN_ERR "%s: %d - error\n", __func__, __LINE__);
return ERROR;
}
}
/*
Generate Clocks and wait for Target to pull SDATA Low again
*/
iTimer = TRANSITION_TIMEOUT;
while (1) {
SCLKLow();
/* Delay(CLK_DELAY); */
if (!fSDATACheck()) /* exit once SDATA returns LOW */
break;
/*SCLKHigh();*/
/* Delay(CLK_DELAY); */
/* If the wait is too long then timeout */
if (iTimer-- == 0){
printk(KERN_ERR "%s: %d - error\n", __func__, __LINE__);
return ERROR;
}
}
return PASS;
}
/* ============================================================================
// fDetectHiLoTransition()
// Waits for transition from SDATA = 1 to SDATA = 0. Has a 100 msec timeout.
// TRANSITION_TIMEOUT is a loop counter for a 100msec timeout when waiting for
// a high-to-low transition. This is used in the polling loop of
// fDetectHiLoTransition(). The timing of the while(1) loops can be calculated
// and the number of loops is counted, using iTimer, to determine when 100
// msec has passed.
//
// SCLK cannot run faster than the specified maximum frequency of 8MHz. Some
// processors may need to have delays added after setting SCLK low and setting
// SCLK high in order to not exceed this specification. The maximum frequency
// of SCLK should be measured as part of validation of the final program
//
// Returns:
// 0 if successful
// -1 if timed out.
============================================================================*/
signed char fDetectHiLoTransition(void)
{
/* nTimer breaks out of the while loops if the wait in the two loops totals
// more than 100 msec. Making this static makes the loop run a faster.
// This is really a processor/compiler dependency and it not needed.
*/
static unsigned int iTimer;
/* NOTE:
// These loops look unconventional, but it is necessary to check SDATA_PIN
// as shown because the transition can be missed otherwise, due to the
// length of the SDATA Low-High-Low after certain commands.
*/
/* Generate clocks for the target to pull SDATA High */
iTimer = 40000; /*TRANSITION_TIMEOUT; */
while (1) {
int ret;
SCLKLow();
ret = fSDATACheck();
if (ret) /* exit once SDATA goes HI */
break;
SCLKHigh();
/* If the wait is too long then timeout */
if (iTimer-- == 0)
return ERROR;
}
/* Generate Clocks and wait for Target to pull SDATA Low again */
#if 0 /* wly */
iTimer = 40000;/* TRANSITION_TIMEOUT; */
while (1) {
int ret;
SCLKLow();
ret = fSDATACheck();
/* pr_info("wly while 2, ret=%d\n", ret); */
if (!ret) { /* exit once SDATA returns LOW */
break;
}
/* SCLKHigh();
// If the wait is too long then timeout
*/
if (iTimer-- == 0) {
#ifdef USE_TP
SetTPHigh(); /* Only used of Test Points are enabled */
#endif
return ERROR;
}
}
#else
SCLKHigh();
SetSDATALow();
SCLKLow();
if (!fSDATACheck()) /* exit once SDATA returns LOW */
SetSDATAHiZ();
mdelay(20);
#endif
#ifdef USE_TP
SetTPHigh(); /* Only used of Test Points are enabled */
#endif
return PASS;
}
