Mirror/betaflight
1
0
Fork 0
mirror of https://github.com/betaflight/betaflight.git synced 2025-07-16 12:55:19 +03:00
Code Issues Wiki Activity

Use striding loadDmaBuffer to avoid buffer copy

Browse source
This commit is contained in:
jflyper 2017-12-23 02:52:01 +09:00
parent 809a7d6b41
commit 9f04705130
5 changed files with 17 additions and 21 deletions
Download patch file Download diff file Expand all files Collapse all files

8
src/main/drivers/pwm_output.c
View file

@ -137,20 +137,20 @@ static void pwmWriteDshot(uint8_t index, float value)
pwmWriteDshotInt(index, lrintf(value));
}
static uint8_t loadDmaBufferDshot(motorDmaOutput_t *const motor, uint16_t packet)
static uint8_t loadDmaBufferDshot(uint32_t *dmaBuffer, int stride, uint16_t packet)
{
for (int i = 0; i < 16; i++) {
motor->dmaBuffer[i] = (packet & 0x8000) ? MOTOR_BIT_1 : MOTOR_BIT_0; // MSB first
dmaBuffer[i * stride] = (packet & 0x8000) ? MOTOR_BIT_1 : MOTOR_BIT_0; // MSB first
packet <<= 1;
}
return DSHOT_DMA_BUFFER_SIZE;
}
static uint8_t loadDmaBufferProshot(motorDmaOutput_t *const motor, uint16_t packet)
static uint8_t loadDmaBufferProshot(uint32_t *dmaBuffer, int stride, uint16_t packet)
{
for (int i = 0; i < 4; i++) {
motor->dmaBuffer[i] = PROSHOT_BASE_SYMBOL + ((packet & 0xF000) >> 12) * PROSHOT_BIT_WIDTH; // Most significant nibble first
dmaBuffer[i * stride] = PROSHOT_BASE_SYMBOL + ((packet & 0xF000) >> 12) * PROSHOT_BIT_WIDTH; // Most significant nibble first
packet <<= 4; // Shift 4 bits
}