/*
* Initializes I2C0
*/
void i2c_init() {
// Initialize DMA timer for use in transfer delays
dtim0_init();
// Configure GPIO port AS for SCL and SDA
MCF_GPIO_PASPAR |= MCF_GPIO_PASPAR_SCL0_SCL0;
MCF_GPIO_PASPAR |= MCF_GPIO_PASPAR_SDA0_SDA0;
// Do we need data direction as output?
/*MCF_GPIO_DDRAS |= MCF_GPIO_DDRAS_DDRAS0;
MCF_GPIO_DDRAS |= MCF_GPIO_DDRAS_DDRAS1;*/
// Write the I2C board address
MCF_I2C0_I2ADR |= MCF_I2C_I2ADR_ADR(I2C_ADDR);
// Write the i2c clock rate. f_i2c = 80Mhz / divider
// divider = 80Mhz / 0.1 Mhz = 800. Closest divider in Table 29.2 896 for 89.29Khz, IC = 0x3A
MCF_I2C0_I2FDR |= MCF_I2C_I2FDR_IC(0x3A);
// Reset to slave-receiver mode
i2c_reset();
// If the bus is busy b/c a slave is transmitting, generate a stop bit when switching
// from master-recviver back to slave-receiver
if(MCF_I2C0_I2SR & MCF_I2C_I2SR_IBB) {
MCF_I2C0_I2CR = 0x00; // Board is slave-receiver, i2c disabled, interrupts disabled
MCF_I2C0_I2CR = 0xA0; // Board is master-receiver, i2c enabled, interrupts, disabled
uint8_t dummy = MCF_I2C0_I2DR; // Dummy read from slave which is transmitting
MCF_I2C0_I2SR = 0x00; // Clear arbitration lost flag, clear i2c interrupt request flag
MCF_I2C0_I2CR = 0x00; // Board is slave-receiver, i2c disabled, interrupts disabled
MCF_I2C0_I2CR = 0x80; // Enable I2C module
}
}
void fst_nunchuk_init(){
dtim0_init();
i2c_init(); //100 kHz
}