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MCUXpresso: Enable I2C SDA & SCL pins internal pullup resistors 

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>
pull/6310/head
Mahesh Mahadevan 2018-03-09 08:18:21 -06:00
parent d29c12d233
commit 53fa4e5fc4
1 changed files with 7 additions and 3 deletions
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10
targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/api/i2c_api.c
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@ -36,6 +36,9 @@ void i2c_init(i2c_t *obj, PinName sda, PinName scl)
{ {
uint32_t i2c_sda = pinmap_peripheral(sda, PinMap_I2C_SDA); uint32_t i2c_sda = pinmap_peripheral(sda, PinMap_I2C_SDA);
uint32_t i2c_scl = pinmap_peripheral(scl, PinMap_I2C_SCL); uint32_t i2c_scl = pinmap_peripheral(scl, PinMap_I2C_SCL);
PORT_Type *port_addrs[] = PORT_BASE_PTRS;
PORT_Type *base = port_addrs[sda >> GPIO_PORT_SHIFT];
obj->instance = pinmap_merge(i2c_sda, i2c_scl); obj->instance = pinmap_merge(i2c_sda, i2c_scl);
obj->next_repeated_start = 0; obj->next_repeated_start = 0;
MBED_ASSERT((int)obj->instance != NC); MBED_ASSERT((int)obj->instance != NC);
@ -49,10 +52,11 @@ void i2c_init(i2c_t *obj, PinName sda, PinName scl)
pinmap_pinout(sda, PinMap_I2C_SDA); pinmap_pinout(sda, PinMap_I2C_SDA);
pinmap_pinout(scl, PinMap_I2C_SCL); pinmap_pinout(scl, PinMap_I2C_SCL);
#if defined(FSL_FEATURE_PORT_HAS_OPEN_DRAIN) && FSL_FEATURE_PORT_HAS_OPEN_DRAIN /* Enable internal pullup resistor */
PORT_Type *port_addrs[] = PORT_BASE_PTRS; base->PCR[sda & 0xFF] |= (PORT_PCR_PE_MASK | PORT_PCR_PS_MASK);
PORT_Type *base = port_addrs[sda >> GPIO_PORT_SHIFT]; base->PCR[scl & 0xFF] |= (PORT_PCR_PE_MASK | PORT_PCR_PS_MASK);
#if defined(FSL_FEATURE_PORT_HAS_OPEN_DRAIN) && FSL_FEATURE_PORT_HAS_OPEN_DRAIN
base->PCR[sda & 0xFF] |= PORT_PCR_ODE_MASK; base->PCR[sda & 0xFF] |= PORT_PCR_ODE_MASK;
base->PCR[scl & 0xFF] |= PORT_PCR_ODE_MASK; base->PCR[scl & 0xFF] |= PORT_PCR_ODE_MASK;
#endif #endif