Difference between revisions of "STM32F107VC/Using MCBQVGA-TS-Display-v12"
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#To see Timer 3's possibilities on PB0 look on page 161 section 9.1.11 table 23 it's seen that timer 3 can use a GPIO pin as ''Output Compare Channel X'' when the pin is configured as ''Alternate Function Push-Pull''. | #To see Timer 3's possibilities on PB0 look on page 161 section 9.1.11 table 23 it's seen that timer 3 can use a GPIO pin as ''Output Compare Channel X'' when the pin is configured as ''Alternate Function Push-Pull''. | ||
#To set PB0 as Alternate Function Push-Pull - See the GPIOx_CRL register on page 166. | #To set PB0 as Alternate Function Push-Pull - See the GPIOx_CRL register on page 166. | ||
− | #To configure Timer 3 as continues [[PWM]] output timer see Page 371 section 15.3.9 | + | #To configure Timer 3 as continues [[PWM]] output timer see Page 371 section 15.3.9 |
+ | ===Example code=== | ||
+ | Still experimental and missing documentation | ||
+ | ;Note:To change Pulse Width change the value of '''TIM3->ARR''' | ||
+ | <source lang=c> | ||
+ | |||
+ | void tim3init( void ) { | ||
+ | int i; | ||
+ | GPIOB->CRL |= 0xa; | ||
+ | //GPIOB->CRL |= ~(0x5); | ||
+ | |||
+ | // Step 2: Enable timer 3 clock (RCC->APB1ENR bit 0 = 1) | ||
+ | RCC->APB1ENR |= 2; | ||
+ | |||
+ | // Step 5: TIM2_ARR = 10000 (Autload Register 10000 - 1 timeout/sek for testing) | ||
+ | // Step 4: TIM2_PSC = 3600 (Prescale to 10000) | ||
+ | TIM3->PSC = 72; | ||
+ | TIM3->ARR = 1000; | ||
+ | TIM3->CCR3 = 100; | ||
+ | TIM3->CCMR2 |= 7 << 4; //PWM mode 1 | ||
+ | TIM3->CCMR2 |= 1 << 3; | ||
+ | TIM3->EGR |= 1; | ||
+ | TIM3->CCER |= 1<<8; //Polarity | ||
+ | TIM3->CCER |= 1<<9; | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | // Step 3: Enable Counter (TIM3_CR1 bit 0 = 1) | ||
+ | TIM3->CR1 |= 1; | ||
+ | } | ||
+ | </source> | ||
+ | |||
=Links= | =Links= | ||
*[http://www.keil.com/mcbstm32c/mcbstm32c-display-board-schematics.pdf MCBSTM32C Display Schematics] (Loads PDF) | *[http://www.keil.com/mcbstm32c/mcbstm32c-display-board-schematics.pdf MCBSTM32C Display Schematics] (Loads PDF) |
Revision as of 16:24, 19 January 2012
Contents
Backlight illumination adjust
The signal BL_control[1] turns on the Backlight LED's controlled by the STLD40D[2] IC on the display. To control the illuminace of the LED's its necessary to turn the LED's off and on using Pulse-Width-Modulation (PWM).
Keil MCBSTM32C board
On the Keil MCBSTM32C board the BL_control signal is connected to PB0 (Port B bit 0).
- Looking in the Reference Maual on page 173 section 9.3.7 table 44 it's seen that Timer 3 Channel 3 has an alternate function on PB0.
- To see Timer 3's possibilities on PB0 look on page 161 section 9.1.11 table 23 it's seen that timer 3 can use a GPIO pin as Output Compare Channel X when the pin is configured as Alternate Function Push-Pull.
- To set PB0 as Alternate Function Push-Pull - See the GPIOx_CRL register on page 166.
- To configure Timer 3 as continues PWM output timer see Page 371 section 15.3.9
Example code
Still experimental and missing documentation
- Note
- To change Pulse Width change the value of TIM3->ARR
void tim3init( void ) {
int i;
GPIOB->CRL |= 0xa;
//GPIOB->CRL |= ~(0x5);
// Step 2: Enable timer 3 clock (RCC->APB1ENR bit 0 = 1)
RCC->APB1ENR |= 2;
// Step 5: TIM2_ARR = 10000 (Autload Register 10000 - 1 timeout/sek for testing)
// Step 4: TIM2_PSC = 3600 (Prescale to 10000)
TIM3->PSC = 72;
TIM3->ARR = 1000;
TIM3->CCR3 = 100;
TIM3->CCMR2 |= 7 << 4; //PWM mode 1
TIM3->CCMR2 |= 1 << 3;
TIM3->EGR |= 1;
TIM3->CCER |= 1<<8; //Polarity
TIM3->CCER |= 1<<9;
// Step 3: Enable Counter (TIM3_CR1 bit 0 = 1)
TIM3->CR1 |= 1;
}
Links
- MCBSTM32C Display Schematics (Loads PDF)
- AM-240320LDTNQW TFT-LCD Display module with Touch Panel (Loads PDF)
- SPFD5408B 720 channel driver for TFT-LCD Display (Loads PDF)
- STMPE811 Touch Screen Controller
- STLD40D White LED power supply for large display backlight (Loads PDF)