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Increase SPI interface speed 4x, to 5.25Mbps. Required modifications to

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SPI peripheral library. At this speed SPI requires ~60% CPU time at -Og
optimisation level. This could be further improved by trimming down the
SPI interrupt. But...

Speed is now limited by Downstream's single-packet-per-URB restriction,
to about 460kB/s. USB Middleware does not implement TX FIFO empty
interrupt, so a bit of work is required here.
pull/7/head
Robert Fisk 9 years ago
parent 5cd9ddbd98
commit 2e3293e84f
3 changed files with 14 additions and 14 deletions
Show Stats Download Patch File Download Diff File

12
Downstream/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_spi.c
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@ -1500,7 +1500,7 @@ void HAL_SPI_IRQHandler(SPI_HandleTypeDef *hspi)
if((tmp1 != RESET) && (tmp2 != RESET) && (tmp3 == RESET)) if((tmp1 != RESET) && (tmp2 != RESET) && (tmp3 == RESET))
{ {
hspi->RxISR(hspi); hspi->RxISR(hspi);
return; //return;
} }
tmp1 = __HAL_SPI_GET_FLAG(hspi, SPI_FLAG_TXE); tmp1 = __HAL_SPI_GET_FLAG(hspi, SPI_FLAG_TXE);
@ -1699,11 +1699,11 @@ uint32_t HAL_SPI_GetError(SPI_HandleTypeDef *hspi)
*/ */
static void SPI_TxCloseIRQHandler(SPI_HandleTypeDef *hspi) static void SPI_TxCloseIRQHandler(SPI_HandleTypeDef *hspi)
{ {
/* Wait until TXE flag is set to send data */ // /* Wait until TXE flag is set to send data */
if(SPI_WaitOnFlagUntilTimeout(hspi, SPI_FLAG_TXE, RESET, SPI_TIMEOUT_VALUE) != HAL_OK) // if(SPI_WaitOnFlagUntilTimeout(hspi, SPI_FLAG_TXE, RESET, SPI_TIMEOUT_VALUE) != HAL_OK)
{ // {
hspi->ErrorCode |= HAL_SPI_ERROR_FLAG; // hspi->ErrorCode |= HAL_SPI_ERROR_FLAG;
} // }
/* Disable TXE interrupt */ /* Disable TXE interrupt */
__HAL_SPI_DISABLE_IT(hspi, (SPI_IT_TXE )); __HAL_SPI_DISABLE_IT(hspi, (SPI_IT_TXE ));

12
Upstream/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_spi.c
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@ -1500,7 +1500,7 @@ void HAL_SPI_IRQHandler(SPI_HandleTypeDef *hspi)
if((tmp1 != RESET) && (tmp2 != RESET) && (tmp3 == RESET)) if((tmp1 != RESET) && (tmp2 != RESET) && (tmp3 == RESET))
{ {
hspi->RxISR(hspi); hspi->RxISR(hspi);
return; //return;
} }
tmp1 = __HAL_SPI_GET_FLAG(hspi, SPI_FLAG_TXE); tmp1 = __HAL_SPI_GET_FLAG(hspi, SPI_FLAG_TXE);
@ -1699,11 +1699,11 @@ uint32_t HAL_SPI_GetError(SPI_HandleTypeDef *hspi)
*/ */
static void SPI_TxCloseIRQHandler(SPI_HandleTypeDef *hspi) static void SPI_TxCloseIRQHandler(SPI_HandleTypeDef *hspi)
{ {
/* Wait until TXE flag is set to send data */ // /* Wait until TXE flag is set to send data */
if(SPI_WaitOnFlagUntilTimeout(hspi, SPI_FLAG_TXE, RESET, SPI_TIMEOUT_VALUE) != HAL_OK) // if(SPI_WaitOnFlagUntilTimeout(hspi, SPI_FLAG_TXE, RESET, SPI_TIMEOUT_VALUE) != HAL_OK)
{ // {
hspi->ErrorCode |= HAL_SPI_ERROR_FLAG; // hspi->ErrorCode |= HAL_SPI_ERROR_FLAG;
} // }
/* Disable TXE interrupt */ /* Disable TXE interrupt */
__HAL_SPI_DISABLE_IT(hspi, (SPI_IT_TXE )); __HAL_SPI_DISABLE_IT(hspi, (SPI_IT_TXE ));

2
Upstream/Src/upstream_spi.c
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@ -54,7 +54,7 @@ void Upstream_InitSPI(void)
Hspi1.Init.CLKPolarity = SPI_POLARITY_LOW; Hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
Hspi1.Init.CLKPhase = SPI_PHASE_1EDGE; Hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
Hspi1.Init.NSS = SPI_NSS_SOFT; Hspi1.Init.NSS = SPI_NSS_SOFT;
Hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32; //42MHz APB2 / 32 = 1.3Mbaud Hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_8; //42MHz APB2 / 32 = 1.3Mbaud
Hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB; Hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
Hspi1.Init.TIMode = SPI_TIMODE_DISABLED; Hspi1.Init.TIMode = SPI_TIMODE_DISABLED;
Hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_ENABLED; Hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_ENABLED;

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