Hello,
I am working on STM8L-Discovery DAC module.
I have used Timer 4 trigger (1Khz) and DMA transfer is enabled.
But my DAC_OUT1 pin PF0 isn't giving a sine wave.
I want to know what mistake I might have done.
Thanks in advance.
Regards,
Sandeep
Tool Used - IAR Workbench
Code-
#include "stm8l152C6.h"
uint16_t Sinus12bit[130] = {1800, 1887, 1974, 2060, 2146, 2231, 2315, 2397, 2479,
2559, 2637, 2713, 2786, 2858, 2927, 2994, 3057, 3118,
3176, 3230, 3281, 3329, 3373, 3414, 3450, 3483, 3512,
3537, 3558, 3574, 3587, 3595, 3599, 3599, 3595, 3587,
3574, 3558, 3537, 3512, 3483, 3450, 3414, 3373, 3329,
3281, 3230, 3176, 3118, 3057, 2994, 2927, 2858, 2786,
2713, 2637, 2559, 2479, 2397, 2315, 2231, 2146, 2060,
1974, 1887, 1800, 1713, 1626, 1540, 1454, 1369, 1285,
1203, 1121, 1041, 963, 887, 814, 742, 673, 606, 543, 482,
424, 370, 319, 271, 227, 186, 150, 117, 88, 63, 42, 26, 13,
5, 1, 1, 5, 13, 26, 42, 63, 88, 117, 150, 186, 227, 271, 319,
370, 424, 482, 543, 606, 673, 742, 814, 887, 963, 1041,
1121, 1203, 1285, 1369, 1454, 1540, 1626, 1713};
void SetPowerRegisters(void)
{
PWR->CSR1=0X0B; // PVD on, Threshold 2.85 V
RST->SR=0xff;
}
void SetClock(void)
{
CLK->CKDIVR = 0x00; // No Clock Division
CLK->CRTCR = 0x00; // No RTC clock selected
CLK->ICKCR = 0x01; // HSI On
CLK->PCKENR1 |= 0x84; // DAC and TIM4 clock enabled
CLK->PCKENR2 |= 0x20; // DMA1 clock enabled
//CLK->PCKENR3 |= 0x08;
CLK->SWR = 0x01; // HSI as system clock
}
void SetPort(void)
{
GPIOE->DDR |= 0x80;
GPIOE->CR1 |= 0x80;
GPIOE->CR2 |= 0x80;
GPIOE->ODR = 0x80; // LED at PE7
}
void SetTIM4(void)
{
TIM4->IER|=0x01; // Trigger and Update interrupt enabled
TIM4->CR1 |= 0x81; // Counter enable
TIM4->CR2 |= 0x20; // TIM4 TRGO selection
TIM4->SMCR|=0x00;
TIM4->PSCR |= 0x06;//0x05; // Set the Prescaler value
TIM4->DER|=0x01; // DMA Request Enable
TIM4->EGR|=0x00;
TIM4->CNTR |=0x00;
TIM4->ARR = 89;
}
void SetDAC(void)
{
DAC->CH1CR1 |= 0x05;//0x04;//0x05; // Timer 4 Trigger and DAC Channel enabled
DAC->CH1CR2 |= 0x10;//0x10;//0x30; // DMA enabled
//DAC->SR |= 0x01; // DAC underrun detection
//DAC->SWTRIGR |=0x01; // Enable Software Trigger
}
void SetDMA(void)
{
DMA1_Channel3->CCR |= 0x38; // channel 3 enabled, Memory to Peripheral, Memory Increment, Circular
DMA1->GCSR = 0xFD; // Max time out, DMA global channel
uint16_t Add;
DMA1_Channel3->CPARH = 0x53; // peripheral address
DMA1_Channel3->CPARL = 0x88;
Add = (uint16_t)&Sinus12bit[0];
DMA1_Channel3->CM0ARL = Add; // memory address
DMA1_Channel3->CM0ARH = Add>>8;
DMA1_Channel3->CNBTR = 2; // 100 no of data transfer
DMA1_Channel3->CSPR = 0x38;
}
void main( void )
{
SetClock();
SetPort();
GPIOF->DDR|=0x01;
GPIOF->ODR|= 0x00;
SetDMA();
SetDAC();
SetTIM4();
while(1)
{
}
}
