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https://github.com/google/mozc-devices.git
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65db5df370
Change-Id: I3c50b5c3435c3c01c79bfc14c5d605701a423356 Co-authored-by: Takashi Toyoshima <toyoshim@google.com> Co-authored-by: Shun Ikejima <ikejima@google.com> Reviewed-by: Eliot Courtney <edcourtney@google.com>
58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
// Copyright 2024 Google Inc.
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// Use of this source code is governed by an Apache License that can be found in
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// the LICENSE file.
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#include "led.h"
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#include "main.h"
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extern SPI_HandleTypeDef hspi1;
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#define RESET_COUNT 16
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#define LED_COUNT 8
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#define DATA_LENGTH 6
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#define DMA_BUFFER_SIZE (RESET_COUNT + LED_COUNT * DATA_LENGTH + 1) << 1
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// 0xe: 1110 - HIGH
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// 0x8: 1000 - LOW
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static uint16_t dma_buffer[DMA_BUFFER_SIZE] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // RESET
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0, 0, 0, 0, 0, 0, // LED 0
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0, 0, 0, 0, 0, 0, // LED 1
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0, 0, 0, 0, 0, 0, // LED 2
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0, 0, 0, 0, 0, 0, // LED 3
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0, 0, 0, 0, 0, 0, // LED 4
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0, 0, 0, 0, 0, 0, // LED 5
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0, 0, 0, 0, 0, 0, // LED 6
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0, 0, 0, 0, 0, 0, // LED 7
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0xffff, // EOD
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};
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static uint32_t to_spi_value(uint8_t value) {
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uint32_t spi_value = 0;
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for (uint8_t bit_mask = 0x80; bit_mask != 0; bit_mask >>= 1) {
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spi_value <<= 4;
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if (value & bit_mask) {
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spi_value |= 0xe;
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} else {
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spi_value |= 0x8;
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}
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}
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return spi_value;
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}
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void set_spi_value(uint8_t offset, uint32_t value) {
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dma_buffer[RESET_COUNT + offset * 2 + 0] = value >> 16;
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dma_buffer[RESET_COUNT + offset * 2 + 1] = value & 0xffff;
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}
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void led_set(uint8_t index, uint8_t r, uint8_t g, uint8_t b) {
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set_spi_value(index * 3 + 0, to_spi_value(g));
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set_spi_value(index * 3 + 1, to_spi_value(r));
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set_spi_value(index * 3 + 2, to_spi_value(b));
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}
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void led_flush(void) {
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HAL_SPI_Transmit_DMA(&hspi1, (uint8_t *)dma_buffer, DMA_BUFFER_SIZE);
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}
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