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I2C : Support devices without OE.
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@jfdelnero
jfdelnero committed Mar 6, 2024
1 parent 85e8da5 commit a0cea0e
Showing 1 changed file with 73 additions and 30 deletions.
103 changes: 73 additions & 30 deletions lib_jtag_core/src/bus_over_jtag/i2c_over_jtag.c
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Original file line number Diff line number Diff line change
Expand Up @@ -99,48 +99,88 @@ int jtagcore_i2c_set_sda_pin(jtag_core * jc, int device, int pin)
return JTAG_CORE_BAD_PARAMETER;
}

static void jtagcore_i2c_set_scl_state_high(jtag_core * jc)
{
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 0);
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OUTPUT, 1);
}

static void jtagcore_i2c_set_scl_state_low(jtag_core * jc)
{
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 1);
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OUTPUT, 0);
}

static void jtagcore_i2c_set_sda_state_high(jtag_core * jc)
{
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 0);
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OUTPUT, 1);
}

static void jtagcore_i2c_set_sda_state_low(jtag_core * jc)
{
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 1);
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OUTPUT, 0);
}

static void i2c_start_bit(jtag_core * jc)
{
// Start bit.
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 1); // SDA low

jtagcore_i2c_set_sda_state_low(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 1); // SCL low

jtagcore_i2c_set_scl_state_low(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);
}


static void i2c_push_bit(jtag_core * jc, int sda_state)
{
if (sda_state)
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 0); // SDA High
{
jtagcore_i2c_set_sda_state_high(jc);
}
else
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 1); // SDA Low
{
jtagcore_i2c_set_sda_state_low(jc);
}

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);

jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 0); // SCL High
jtagcore_i2c_set_scl_state_high(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 1); // SCL Low
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 0); // SDA High

jtagcore_i2c_set_scl_state_low(jc);

jtagcore_i2c_set_sda_state_high(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);

if (!sda_state)
{
//jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 0); // SDA High=
//jtagcore_push_and_pop_chain(jc);
// jtagcore_i2c_set_sda_state_high(jc);
// jtagcore_push_and_pop_chain(jc);
}

}


static void i2c_stop_bit(jtag_core * jc)
{
// Stop bit.
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 1); // SDA low

jtagcore_i2c_set_sda_state_low(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 0); // SCL high

jtagcore_i2c_set_scl_state_high(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 0); // SDA high

jtagcore_i2c_set_sda_state_high(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);
}

Expand All @@ -152,9 +192,12 @@ static int i2c_wait_ack(jtag_core * jc)
acknowledged = 0;

// ACK
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 0); // SDA High
jtagcore_i2c_set_sda_state_high(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 0); // SCL High

jtagcore_i2c_set_scl_state_high(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);

i = 0;
Expand All @@ -171,7 +214,8 @@ static int i2c_wait_ack(jtag_core * jc)
if (i < 10)
acknowledged = 1;

jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 1); // SCL Low
jtagcore_i2c_set_scl_state_low(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);

return acknowledged;
Expand All @@ -185,11 +229,8 @@ int jtagcore_i2c_write_read(jtag_core * jc, int address, int address10bits,int w

if( jc )
{
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 0);
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 0);

jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OUTPUT, 0);
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OUTPUT, 0);
jtagcore_i2c_set_scl_state_high(jc);
jtagcore_i2c_set_sda_state_high(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);

Expand Down Expand Up @@ -227,8 +268,8 @@ int jtagcore_i2c_write_read(jtag_core * jc, int address, int address10bits,int w

if( acknowledged < 0 ) // Error ?
{
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 0);
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 0);
jtagcore_i2c_set_scl_state_high(jc);
jtagcore_i2c_set_sda_state_high(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);

Expand Down Expand Up @@ -261,11 +302,12 @@ int jtagcore_i2c_write_read(jtag_core * jc, int address, int address10bits,int w
{
do
{
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 0); // SCL High
jtagcore_i2c_set_scl_state_high(jc);

if ( jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_READ) != JTAG_CORE_NO_ERROR )
{
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 0);
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 0);
jtagcore_i2c_set_scl_state_high(jc);
jtagcore_i2c_set_sda_state_high(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);

Expand All @@ -274,8 +316,8 @@ int jtagcore_i2c_write_read(jtag_core * jc, int address, int address10bits,int w

if ( jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_READ) != JTAG_CORE_NO_ERROR )
{
jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 0);
jtagcore_set_pin_state(jc, jc->i2c_sda_device, jc->i2c_sda_pin, JTAG_CORE_OE, 0);
jtagcore_i2c_set_scl_state_high(jc);
jtagcore_i2c_set_sda_state_high(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);

Expand All @@ -289,7 +331,8 @@ int jtagcore_i2c_write_read(jtag_core * jc, int address, int address10bits,int w
rd_buffer[i] |= 0x80>>j;
}

jtagcore_set_pin_state(jc, jc->i2c_scl_device, jc->i2c_scl_pin, JTAG_CORE_OE, 1); // SCL Low
jtagcore_i2c_set_scl_state_low(jc);

jtagcore_push_and_pop_chain(jc, JTAG_CORE_WRITE_ONLY);
}

Expand Down

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