void i2c1_isr(void) {
//WARNING: prints in here are a bad idea
static int i=0;
uint32_t isr = I2C_ISR(I2C_BUS);
if (isr & I2C_ISR_RXNE) {
//do this first so we don't lose a char if other events are happening
volatile uint8_t byte = I2C_RXDR(I2C_BUS);
i2c_rx_buf[i2c_rx_bytes++] = byte;
// printf("rx 0x%02x\n", byte);
}
if (isr & I2C_ISR_ADDR) {
// printf("\n");
// printf("\naddress match 0x%04lx dir%d\n", I2C_ISR_ADDCODE_VALG(isr), !!(isr & I2C_ISR_DIR));
I2C_ICR(I2C_BUS) = I2C_ICR_ADDRCF;
i2c_rx_bytes = 0;
i2c_tx_bytes = 0;
if (isr & I2C_ISR_DIR) {
I2C_ISR(I2C_BUS) |= I2C_ISR_TXE;
}
}
if ((isr & (I2C_ISR_TXIS | I2C_ISR_DIR)) == (I2C_ISR_TXIS | I2C_ISR_DIR)) {
if(!(isr & I2C_ISR_STOPF)) {
volatile uint8_t byte = i2c_tx_buf[i2c_tx_bytes++];
I2C_TXDR(I2C_BUS) = byte;
// printf("t");
}
// printf("i0x%08lx\n", isr);
}
if (isr & I2C_ISR_STOPF) {
// printf("stop dir%d\n", !!(isr & I2C_ISR_DIR));
if(!(isr & I2C_ISR_DIR)) {
handle_i2c_bufs();
}
I2C_ICR(I2C_BUS) = I2C_ICR_STOPCF;
I2C_TXDR(I2C_BUS) = 0; //hack to avoid another txis interrupt at the end
}
if (isr & I2C_ISR_NACKF) {
// printf("nack\n");
I2C_ICR(I2C_BUS) = I2C_ICR_NACKCF;
}
if (isr & 0x3f00) {
i++;
if(i>10) {
while(1) {
// printf("i2c error 0x%08lx\n", isr);
}
}
}
}
void i2c_send_data(uint32_t i2c, uint8_t data)
{
I2C_TXDR(i2c) = data;
}
