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i2c_bitbang: Change logic when to use i2c_delay()

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This commit is contained in:
Harald Welte
2016-09-01 11:57:09 +02:00
parent 226b40aba4
commit c6ae98c53a
1 changed files with 15 additions and 20 deletions
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35
firmware/src_simtrace/i2c.c
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@@ -7,6 +7,16 @@ static const Pin pin_sda = {PIO_PA30, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_OPENDRAIN
static const Pin pin_sda_in = {PIO_PA30, PIOA, ID_PIOA, PIO_INPUT, PIO_DEFAULT }; static const Pin pin_sda_in = {PIO_PA30, PIOA, ID_PIOA, PIO_INPUT, PIO_DEFAULT };
static const Pin pin_scl = {PIO_PA31, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_OPENDRAIN }; static const Pin pin_scl = {PIO_PA31, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_OPENDRAIN };
static void i2c_delay()
{
volatile int v;
int i;
for (i = 0; i < 100; i++) {
v = 0;
}
}
void i2c_pin_init(void) void i2c_pin_init(void)
{ {
PIO_Configure(&pin_scl, PIO_LISTSIZE(pin_scl)); PIO_Configure(&pin_scl, PIO_LISTSIZE(pin_scl));
@@ -16,21 +26,25 @@ void i2c_pin_init(void)
static void set_scl(void) static void set_scl(void)
{ {
PIO_Set(&pin_scl); PIO_Set(&pin_scl);
i2c_delay();
} }
static void set_sda(void) static void set_sda(void)
{ {
PIO_Set(&pin_sda); PIO_Set(&pin_sda);
i2c_delay();
} }
static void clear_scl(void) static void clear_scl(void)
{ {
PIO_Clear(&pin_scl); PIO_Clear(&pin_scl);
i2c_delay();
} }
static void clear_sda(void) static void clear_sda(void)
{ {
PIO_Clear(&pin_sda); PIO_Clear(&pin_sda);
i2c_delay();
} }
static bool read_sda(void) static bool read_sda(void)
@@ -51,26 +65,13 @@ static bool read_sda(void)
static bool i2c_started = false; static bool i2c_started = false;
static void i2c_delay()
{
volatile int v;
int i;
for (i = 0; i < 100; i++) {
v = 0;
}
}
static void i2c_start_cond(void) static void i2c_start_cond(void)
{ {
if (i2c_started) { if (i2c_started) {
set_sda(); set_sda();
i2c_delay();
set_scl(); set_scl();
i2c_delay();
} }
i2c_delay();
clear_sda(); clear_sda();
i2c_delay(); i2c_delay();
clear_scl(); clear_scl();
@@ -80,9 +81,7 @@ static void i2c_start_cond(void)
static void i2c_stop_cond(void) static void i2c_stop_cond(void)
{ {
clear_sda(); clear_sda();
i2c_delay();
set_scl(); set_scl();
i2c_delay();
set_sda(); set_sda();
i2c_delay(); i2c_delay();
i2c_started = false; i2c_started = false;
@@ -94,11 +93,9 @@ static void i2c_write_bit(bool bit)
set_sda(); set_sda();
else else
clear_sda(); clear_sda();
i2c_delay(); i2c_delay(); // ?
set_scl(); set_scl();
i2c_delay();
clear_scl(); clear_scl();
i2c_delay();
} }
static bool i2c_read_bit(void) static bool i2c_read_bit(void)
@@ -106,9 +103,7 @@ static bool i2c_read_bit(void)
bool bit; bool bit;
set_sda(); set_sda();
i2c_delay();
set_scl(); set_scl();
i2c_delay();
bit = read_sda(); bit = read_sda();
clear_scl(); clear_scl();