Add support for AD7191 #2655
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Add support for AD7191 #2655
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Some sigma-delta ADCs, such as AD7191 and AD7780, have no registers and start conversion when CS is asserted. Add helper function to support this use case by allowing devices to assert CS without performing register operations. This function can be used by drivers through their set_mode callback. Signed-off-by: Alisa-Dariana Roman <[email protected]>
Automatically imply AD7191. Signed-off-by: Alisa-Dariana Roman <[email protected]>
AD7191 is a pin-programmable, ultralow noise 24-bit sigma-delta ADC designed for precision bridge sensor measurements. It features two differential analog input channels, selectable output rates, programmable gain, internal temperature sensor and simultaneous 50Hz/60Hz rejection. Signed-off-by: Alisa-Dariana Roman <[email protected]>
AD7191 is a pin-programmable, ultralow noise 24-bit sigma-delta ADC designed for precision bridge sensor measurements. It features two differential analog input channels, selectable output rates, programmable gain, internal temperature sensor and simultaneous 50Hz/60Hz rejection. Signed-off-by: Alisa-Dariana Roman <[email protected]>
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PR Description
AD7191 is a chip from the AD719X family, with similar functionalities. Since this chip is entirely pin-programmable with no registers, I wrote a separate driver from ad7192.c.
Sigma delta adc drivers use the set_mode() callback function which contains a register write to make sure the chip select line is asserted before waiting for an interrupt. Devices such as AD7191 and AD7780 have no registers to write to, so I added a helper function ad_sd_assert_cs() for these use cases.
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