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| author | Ayushee <ayushee.shah@intel.com> | 2019-04-05 11:39:51 -0700 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2019-05-02 16:12:40 -0700 |
| commit | b7a7ad3ffc436fc074c79b62194c33980e746586 (patch) | |
| tree | 7332a81c666c66db9f6af9fc4422aae105c5f1b5 /include/display_7seg.h | |
| parent | 34366869bbab2e7c27a037b4c7d3c15ee5bf151a (diff) | |
| download | chrome-ec-b7a7ad3ffc436fc074c79b62194c33980e746586.tar.gz | |
driver/max695x: Add 7 segment display driver
Port80 information and power sequencing states can be displayed on the
7-segment so that we can observe its information without connecting a
debugger. Adding this CL to initialize and write to the 7-segment display.
For port80, 80(data) gets displayed on the seven segment, for the
power states, EC(state) gets displayed on the seven segment.
The MAX6958/MAX6959 is a compact multiplexed common - cathode display
designed to interface microprocessors with seven - segment numerical LED
digits or to discrete LEDs via a 2-wire serial interface compatible with
SMBusTM and I2C. The 2-wire serial interface uses fixed logic thresholds
of 0.8V/2.1V when the display driver is powered from a 5V supply for
compatibility with 2.5V and 3.3V systems.
BRANCH=None
BUG=b:130738086
TEST=Manually tested on intelrvp, able to write to the 7 segment display
Change-Id: I82ba3aca40640e094463669aa1ff106ce7b99b7b
Signed-off-by: Ayushee <ayushee.shah@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/1574665
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Ayushee Shah <ayushee.shah@intel.com>
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
Diffstat (limited to 'include/display_7seg.h')
| -rw-r--r-- | include/display_7seg.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/display_7seg.h b/include/display_7seg.h new file mode 100644 index 0000000000..9574518cb3 --- /dev/null +++ b/include/display_7seg.h @@ -0,0 +1,27 @@ +/* Copyright (c) 2019 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +/* Seven Segment Display module for Chrome EC */ + +#ifndef __CROS_EC_DISPLAY_7SEG_H +#define __CROS_EC_DISPLAY_7SEG_H + +enum seven_seg_module_display { + SEVEN_SEG_CONSOLE_DISPLAY, /* Console data */ + SEVEN_SEG_EC_DISPLAY, /* power state */ + SEVEN_SEG_PORT80_DISPLAY, /* port80 data */ +}; + +/** + * Write register to MAX656x 7-segment display. + * + * @param module which is writing to the display + * @param data to be displayed + * @return EC_SUCCESS is write is successful + */ +int display_7seg_write(enum seven_seg_module_display module, uint16_t data); + +#endif /* __CROS_EC_DISPLAY_7SEG_H */ + |