Posted on May 17, 2011 at 14:02The ST32 communicate with the component PCA9633 (it is a LED driver)
I have my code very simplified to find the root cause:
void I2CInit(void) {
RCC->APB1ENR |= 0x00400000; // Pheripherie Clk für I2C1
RCC->APB2ENR |= 0x00000008; // Pheripherie Clock für PortB freischalten
I2C2->CR1 |= 0x8000; // SWRST
I2C2->CR1 &= ~0x8000; // SWRST
I2C2->CR1 |= 0x0001; // I/O Pins für I2C einschalten (PE)
I2C2->CR2 |= 0x00000024; // FREQ = 36MHz
I2C2->CCR |= 0x000000B4; // Busfrequenz = 100kHz
I2C2->CR1 |= 0x0400; // ACK
}
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int main (void) {
// Slave component: PCA9633
// PB10 = SCL
// PB11 = SDA
I2CInit();
stm32_Init (); /* STM32 setup */
for (counter = 0; counter <=255; counter++) {
I2C2->CR1 |= 0x0100; // I2C Send I2C start
delay(50000);
delay(50000);
I2C2->DR = 0x02; // PCA9633 slave address
temp = I2C2->SR1; // Read SR register to clear ADDR
temp += temp;
temp = I2C2->SR2; // Read SR register to clear ADDR
temp += temp;
delay(50000);
delay(50000);
I2C2->DR = 0x03; // PCA9633 control register
delay(50000);
delay(50000);
I2C2->DR = counter; // Brightness control LED0 Register
delay(50000);
delay(50000);
I2C2->CR1 |= 0x0200; // I2C send stop
delay(50000);
delay(50000);
}
}
