UM0851 datasheet(190/245 Pages) STMICROELECTRONICS

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Human interface device (HID) drivers

UM0851

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Doc ID 16604 Rev 2

7.3.4

Known issues or limitations

There are some known issues with the current hardware or driver.

●

DMA is only available for Channel 0. This is a limitation of ADC Device.

●

In SPEAr300, DMA on ADC channel zero is not working due to a hardware issue

7.3.5

ADC device driver performance

The performance measurement has been performed using:

Hardware: ARM926EJS (333MHz), SPEAr600 and SPEAr300 boards.

Kernel: linux-2.6.27

7.3.6

Configuration options

7.3.7

References

●

SPEAr ADC Driver "drivers/char/spr_adc_st10.c", "drivers/char/spr_adc_st10.h" and

"include/linux/spr_adc_st10_usr.h".

7.3.8

LCD panel support

SPEAr supports LCD panels of different resolutions.

Pls refer to Section 8.1: LCD controller (CLCD) driver for more details.

7.3.9

USB HID Class Support

If needed it is possible to plug to SPEAr USB mice and keyboards, which will be accessed

through the USB HID class.

Please refer to the Section 4.3: USB Host for more details.

Table 49.

ADC configurations options

Configuration option

Comment

CONFIG_SPEAR_ADC_ST10

This option enables the ADC driver in Linux.

CONFIG_SPEAR_DMAC_PL080

This option enables DMA transfers on ADC channel 0 by

enabling support for DMA driver.

CONFIG_SPEAR_ADC_ST10_DEBUG

This option enables ADC debug prints.

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