adc_gpio_i2c/i2c_bb
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Exchange usleep with wait.

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This commit is contained in:
Thomas Klaehn 2019-08-01 12:34:40 +01:00
parent fcdc3125c7
commit 9856e38e81
1 changed files with 17 additions and 10 deletions
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27
src/i2c.c
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@ -14,6 +14,7 @@ static void write_bit(const struct i2c_bb *i2c, uint8_t bit);
static uint8_t read_bit(const struct i2c_bb *i2c); static uint8_t read_bit(const struct i2c_bb *i2c);
static void start_condition(const struct i2c_bb *i2c); static void start_condition(const struct i2c_bb *i2c);
static void stop_condition(const struct i2c_bb *i2c); static void stop_condition(const struct i2c_bb *i2c);
static void wait(void);
static bool write_byte(const struct i2c_bb *i2c, uint8_t byte); static bool write_byte(const struct i2c_bb *i2c, uint8_t byte);
static uint8_t read_byte(const struct i2c_bb *i2c, bool ack); static uint8_t read_byte(const struct i2c_bb *i2c, bool ack);
@ -93,11 +94,11 @@ static void start_condition(const struct i2c_bb *i2c)
gpio_write(i2c->pin_scl, 1); gpio_write(i2c->pin_scl, 1);
gpio_write(i2c->pin_sda, 1); gpio_write(i2c->pin_sda, 1);
usleep(5); wait();
gpio_write(i2c->pin_sda, 0); gpio_write(i2c->pin_sda, 0);
usleep(5); wait();
gpio_write(i2c->pin_scl, 0); gpio_write(i2c->pin_scl, 0);
usleep(5); wait();
} }
static void stop_condition(const struct i2c_bb *i2c) static void stop_condition(const struct i2c_bb *i2c)
@ -105,11 +106,16 @@ static void stop_condition(const struct i2c_bb *i2c)
assert( NULL != i2c); assert( NULL != i2c);
gpio_write(i2c->pin_sda, 0); gpio_write(i2c->pin_sda, 0);
usleep(5); wait();
gpio_write(i2c->pin_scl, 1); gpio_write(i2c->pin_scl, 1);
usleep(5); wait();
gpio_write(i2c->pin_sda, 1); gpio_write(i2c->pin_sda, 1);
usleep(5); wait();
}
static void wait(void)
{
asm volatile("nop");
} }
static bool write_byte(const struct i2c_bb *i2c, uint8_t byte) static bool write_byte(const struct i2c_bb *i2c, uint8_t byte)
@ -157,9 +163,9 @@ static void write_bit(const struct i2c_bb *i2c, uint8_t bit)
} }
gpio_write(i2c->pin_sda, value); gpio_write(i2c->pin_sda, value);
usleep(5); wait();
gpio_write(i2c->pin_scl, 1); gpio_write(i2c->pin_scl, 1);
usleep(5); wait();
gpio_write(i2c->pin_scl, 0); gpio_write(i2c->pin_scl, 0);
} }
@ -170,10 +176,10 @@ static uint8_t read_bit(const struct i2c_bb *i2c)
assert(NULL != i2c); assert(NULL != i2c);
gpio_write(i2c->pin_sda, 1); gpio_write(i2c->pin_sda, 1);
usleep(5); wait();
gpio_write(i2c->pin_scl, 1); gpio_write(i2c->pin_scl, 1);
gpio_direction(i2c->pin_sda, 0); gpio_direction(i2c->pin_sda, 0);
usleep(5); wait();
res = gpio_read(i2c->pin_sda); res = gpio_read(i2c->pin_sda);
gpio_write(i2c->pin_scl, 0); gpio_write(i2c->pin_scl, 0);
gpio_direction(i2c->pin_sda, 1); gpio_direction(i2c->pin_sda, 1);
@ -184,3 +190,4 @@ static uint8_t read_bit(const struct i2c_bb *i2c)
return (uint8_t) res; return (uint8_t) res;
} }