The following patches add support for triggered buffer mode. These are based on top of "Add PWM and IIO timer drivers for STM32" series. Reference: https://lkml.org/lkml/2017/1/18/588 STM32 ADC, can use either interrupts or DMA to collect data. Either timer trigger output (TRGO) or PWM can be used as trigger source. This patchset has been tested on STM32F429 eval board. - Example to enable timer1 PWM: cd /sys/devices/platform/soc/40010000.timers/40010000.timers:pwm/pwm/pwmchip4/ echo 0 > export # timer 1 channel 1 echo 1000000 > pwm0/period # 1000Hz echo 500000 > pwm0/duty_cycle echo 1 > pwm0/enable - Example to enable timer3 TRGO: cd /sys/bus/iio/devices/ cat trigger6/name tim1_ch1 cat trigger0/name tim3_trgo echo 1000 > trigger0/sampling_frequency - Example to configure STM32ADC in triggered buffer mode, with timer1 PWM or timer3 TRGO: cd /sys/bus/iio/devices/iio\:device0 echo tim1_ch1 > trigger/current_trigger OR: echo tim3_trgo > trigger/current_trigger echo 1 > scan_elements/in_voltage8_en echo 1 > buffer/enable Fabrice Gasnier (7): iio: adc: stm32: add support for triggered buffer mode iio: adc: stm32: Enable use of stm32 timer triggers iio: adc: stm32: add trigger polarity extended attribute Documentation: dt: iio: stm32-adc: optional dma support iio: adc: stm32: add optional dma support ARM: dts: stm32: Enable dma by default on stm32f4 adc ARM: dts: stm32: Enable pwm1 and pwm3 for stm32f469-eval .../devicetree/bindings/iio/adc/st,stm32-adc.txt | 7 + arch/arm/boot/dts/stm32429i-eval.dts | 28 + arch/arm/boot/dts/stm32f429.dtsi | 6 + drivers/iio/adc/Kconfig | 6 + drivers/iio/adc/stm32-adc-core.c | 1 + drivers/iio/adc/stm32-adc-core.h | 2 + drivers/iio/adc/stm32-adc.c | 643 ++++++++++++++++++++- 7 files changed, 690 insertions(+), 3 deletions(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
