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i2c_master: fix line check

This commit is contained in:
King Kévin 2019-12-12 18:53:23 +01:00
parent 4588165370
commit e087ff744d
1 changed files with 5 additions and 0 deletions
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5
lib/i2c_master.c
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@ -236,6 +236,10 @@ bool i2c_master_check_signals(uint32_t i2c)
{
cm3_assert(I2C1 == i2c || I2C2 == i2c);
// enable GPIOs to read SDA and SCL
rcc_periph_clock_enable(RCC_GPIO_PORT_SDA(i2c)); // enable clock for I²C I/O peripheral
rcc_periph_clock_enable(RCC_GPIO_PORT_SCL(i2c)); // enable clock for I²C I/O peripheral
// pull SDA and SDC low to check if there are pull-up resistors
uint32_t sda_crl = GPIO_CRL(GPIO_PORT_SDA(i2c)); // backup port configuration
uint32_t sda_crh = GPIO_CRH(GPIO_PORT_SDA(i2c)); // backup port configuration
@ -247,6 +251,7 @@ bool i2c_master_check_signals(uint32_t i2c)
gpio_set_mode(GPIO_PORT_SCL(i2c), GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO_PIN_SCL(i2c)); // configure signal as pull down
gpio_clear(GPIO_PORT_SDA(i2c), GPIO_PIN_SDA(i2c)); // pull down
gpio_clear(GPIO_PORT_SCL(i2c), GPIO_PIN_SCL(i2c)); // pull down
sleep_us(100);
bool to_return = (0 != gpio_get(GPIO_PORT_SCL(i2c), GPIO_PIN_SCL(i2c)) && 0 != gpio_get(GPIO_PORT_SDA(i2c), GPIO_PIN_SDA(i2c))); // check if the signals are still pulled high by external stronger pull-up resistors
GPIO_CRL(GPIO_PORT_SDA(i2c)) = sda_crl; // restore port configuration
GPIO_CRH(GPIO_PORT_SDA(i2c)) = sda_crh; // restore port configuration