void i2c_init(i2c_t *obj, PinName sda, PinName scl) {
uint32_t i2c_sda = pinmap_peripheral(sda, PinMap_I2C_SDA);
uint32_t i2c_scl = pinmap_peripheral(scl, PinMap_I2C_SCL);
obj->instance = pinmap_merge(i2c_sda, i2c_scl);
obj->next_repeated_start = 0;
MBED_ASSERT((int)obj->instance != NC);
i2c_master_config_t master_config;
I2C_MasterGetDefaultConfig(&master_config);
I2C_MasterInit(i2c_addrs[obj->instance], &master_config, CLOCK_GetFreq(i2c_clocks[obj->instance]));
I2C_EnableInterrupts(i2c_addrs[obj->instance], kI2C_GlobalInterruptEnable);
pinmap_pinout(sda, PinMap_I2C_SDA);
pinmap_pinout(scl, PinMap_I2C_SCL);
#if defined(FSL_FEATURE_PORT_HAS_OPEN_DRAIN) && FSL_FEATURE_PORT_HAS_OPEN_DRAIN
PORT_Type *port_addrs[] = PORT_BASE_PTRS;
PORT_Type *base = port_addrs[sda >> GPIO_PORT_SHIFT];
base->PCR[sda & 0xFF] |= PORT_PCR_ODE_MASK;
base->PCR[scl & 0xFF] |= PORT_PCR_ODE_MASK;
#endif
}
/*!
* @brief Main function
*/
int main(void)
{
i2c_slave_config_t slaveConfig;
i2c_master_config_t masterConfig;
uint32_t sourceClock;
BOARD_InitPins();
BOARD_BootClockRUN();
BOARD_InitDebugConsole();
PRINTF("\r\nI2C example -- MasterFunctionalInterrupt_SlaveFunctionalInterrupt.\r\n");
/* Enable master and slave NVIC interrupt. */
EnableIRQ(I2C_MASTER_IRQ);
EnableIRQ(I2C_SLAVE_IRQ);
/* Set i2c slave interrupt priority higher. */
NVIC_SetPriority(I2C_SLAVE_IRQ, 0);
NVIC_SetPriority(I2C_MASTER_IRQ, 1);
/*1.Set up i2c slave first*/
/*
* slaveConfig.addressingMode = kI2C_Address7bit;
* slaveConfig.enableGeneralCall = false;
* slaveConfig.enableWakeUp = false;
* slaveConfig.enableHighDrive = false;
* slaveConfig.enableBaudRateCtl = false;
* slaveConfig.enableSlave = true;
*/
I2C_SlaveGetDefaultConfig(&slaveConfig);
slaveConfig.addressingMode = kI2C_Address7bit;
slaveConfig.slaveAddress = I2C_MASTER_SLAVE_ADDR_7BIT;
I2C_SlaveInit(EXAMPLE_I2C_SLAVE_BASEADDR, &slaveConfig);
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
g_slave_buff[i] = 0;
}
/*2.Set up i2c master to send data to slave*/
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
g_master_buff[i] = i;
}
PRINTF("Master will send data :");
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
if (i % 8 == 0)
{
PRINTF("\r\n");
}
PRINTF("0x%2x ", g_master_buff[i]);
}
PRINTF("\r\n\r\n");
/*
* masterConfig.baudRate_Bps = 100000U;
* masterConfig.enableHighDrive = false;
* masterConfig.enableStopHold = false;
* masterConfig.glitchFilterWidth = 0U;
* masterConfig.enableMaster = true;
*/
I2C_MasterGetDefaultConfig(&masterConfig);
masterConfig.baudRate_Bps = I2C_BAUDRATE;
sourceClock = CLOCK_GetFreq(I2C_MASTER_CLK_SRC);
I2C_MasterInit(EXAMPLE_I2C_MASTER_BASEADDR, &masterConfig, sourceClock);
/* Master send address to slave. */
I2C_MasterStart(EXAMPLE_I2C_MASTER_BASEADDR, I2C_MASTER_SLAVE_ADDR_7BIT, kI2C_Write);
/* Enable module interrupt. */
I2C_EnableInterrupts(EXAMPLE_I2C_MASTER_BASEADDR, kI2C_GlobalInterruptEnable);
I2C_EnableInterrupts(EXAMPLE_I2C_SLAVE_BASEADDR, kI2C_GlobalInterruptEnable);
/* Wait slave receive finished. */
while (g_slaveRxIndex < I2C_DATA_LENGTH)
{
}
/* Disable module interrupt. */
I2C_DisableInterrupts(EXAMPLE_I2C_MASTER_BASEADDR, kI2C_GlobalInterruptEnable);
I2C_DisableInterrupts(EXAMPLE_I2C_SLAVE_BASEADDR, kI2C_GlobalInterruptEnable);
/* Master send stop command. */
I2C_MasterStop(EXAMPLE_I2C_MASTER_BASEADDR);
/*3.Transfer completed. Check the data.*/
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
if (g_slave_buff[i] != g_master_buff[i])
{
PRINTF("\r\nError occured in this transfer ! \r\n");
break;
}
}
PRINTF("Slave received data :");
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
if (i % 8 == 0)
{
PRINTF("\r\n");
}
PRINTF("0x%2x ", g_slave_buff[i]);
}
PRINTF("\r\n\r\n");
/*4.Set up slave ready to send data to master.*/
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
g_slave_buff[i] = ~g_slave_buff[i];
}
PRINTF("This time , slave will send data: :");
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
if (i % 8 == 0)
{
PRINTF("\r\n");
}
PRINTF("0x%2x ", g_slave_buff[i]);
}
PRINTF("\r\n\r\n");
/* Already setup the slave transfer ready in item 1. */
/* 5.Set up master to receive data from slave. */
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
g_master_buff[i] = 0;
}
/* Master send address to slave. */
I2C_MasterStart(EXAMPLE_I2C_MASTER_BASEADDR, I2C_MASTER_SLAVE_ADDR_7BIT, kI2C_Read);
/* Enable module interrupt. */
I2C_EnableInterrupts(EXAMPLE_I2C_MASTER_BASEADDR, kI2C_GlobalInterruptEnable);
I2C_EnableInterrupts(EXAMPLE_I2C_SLAVE_BASEADDR, kI2C_GlobalInterruptEnable);
g_masterReadBegin = true;
/* Master put receive data in receive buffer. */
g_masterRxIndex = 0;
/* Wait master receive finished. */
while (g_masterRxIndex < I2C_DATA_LENGTH)
{
}
/* Disable module interrupt. */
I2C_DisableInterrupts(EXAMPLE_I2C_MASTER_BASEADDR, kI2C_GlobalInterruptEnable);
I2C_DisableInterrupts(EXAMPLE_I2C_SLAVE_BASEADDR, kI2C_GlobalInterruptEnable);
/*6.Transfer completed. Check the data.*/
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
if (g_slave_buff[i] != g_master_buff[i])
{
PRINTF("\r\nError occured in the transfer ! \r\n");
break;
}
}
PRINTF("Master received data :");
for (uint32_t i = 0U; i < I2C_DATA_LENGTH; i++)
{
if (i % 8 == 0)
{
PRINTF("\r\n");
}
PRINTF("0x%2x ", g_master_buff[i]);
}
PRINTF("\r\n\r\n");
PRINTF("\r\nEnd of I2C example .\r\n");
while (1)
{
}
}
