Posted on March 26, 2014 at 12:25Hello,
I am working with STM8L151C8 with 48 pins.
To my default DAC1 output on PF0 (which works fine) I want to access to the second DAC output, which I want to have on PB6. The Ref manual says that this is possible by configurating the switches, see Doc ID 15226 Rev 10 page 219/575.
In my code I have the following lines in respect to DAC2:
#define DAC2 PIO_Pin_6 //DAC channel 2
#define PB_DDR_Init GPIO_DDR_RESET_VALUE // not relevant for DAC2
#define PB_ODR_Init GPIO_ODR_RESET_VALUE // not relevant for DAC2
#define PB_CR1_Init GPIO_CR1_RESET_VALUE | DAC2
#define PB_CR2_Init GPIO_CR1_RESET_VALUE //clear all bits
GPIOB->ODR = PB_ODR_Init;
GPIOB->DDR = PB_DDR_Init;
GPIOB->CR1 = PB_CR1_Init;
GPIOB->CR2 = PB_CR2_Init;
RI->IOSR1 = 0x80; //should be the right one for PB6
DAC->CH1CR1 = DAC_CR1_RESET_VALUE | DAC_CR1_EN; /* DAC1 enable, Buffer on */
DAC->CH2CR1 = DAC_CR1_RESET_VALUE | DAC_CR1_EN; /* DAC2 enable, Buffer on */
DAC->CH2RDHRH = (uint8_t) (0);
DAC->CH2RDHRL = (uint8_t) (0);
// DAC->DCH2RDHRH = 0; //DAC2 setting to 0
// DAC->DCH2RDHRL = 0; //DAC2 setting to 0
I tried both for the last two lines. The result is always, that at PB6 is a voltage of 3.2 Volts. My program does not reset to a certain value or zero.
What is my fault here?
Thank you in advance.
Dieter
