Difference between revisions of "STM32F107VC/Using MCBQVGA-TS-Display-v12"
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| + | =Backlight illumination adjust= | ||
| + | The signal BL_control<ref>[http://www.keil.com/mcbstm32c/mcbstm32c-display-board-schematics.pdf MCBSTM32C Display Schematics] (Loads PDF)</ref> turns on the Backlight LED's controlled by the STLD40D<ref>[http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00098098.pdf STLD40D White LED power supply for large display backlight]</ref> 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 [http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/REFERENCE_MANUAL/CD00171190.pdf 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 | ||
=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 10:30, 19 January 2012
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