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This commit is contained in:
Matthew Kennedy 2021-02-15 18:16:00 -08:00 committed by Andrey
parent 969ecd0be5
commit ec8358ca7e
1 changed files with 6 additions and 0 deletions
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6
os/hal/src/hal_mmc_spi.c
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@ -35,6 +35,11 @@
#define MMC_USE_POLLED_EXCHANGE TRUE #define MMC_USE_POLLED_EXCHANGE TRUE
// MMC_USE_POLLED_EXCHANGE is an optimzation that uses the synchronous, non-DMA
// method of directly twiddling the peripheral's registers. It saves us from doing
// so many context switches, plus it makes things cache-friendly by avoiding DMA
// transfers to/from stack allocated storage.
// See https://forum.chibios.org/viewtopic.php?f=38&t=5767
#if MMC_USE_POLLED_EXCHANGE #if MMC_USE_POLLED_EXCHANGE
void spiSendSmall(SPIDriver* spip, size_t n, const uint8_t* buf) { void spiSendSmall(SPIDriver* spip, size_t n, const uint8_t* buf) {
for (size_t i = 0; i < n; i++) { for (size_t i = 0; i < n; i++) {
@ -56,6 +61,7 @@ void spiIgnoreSmall(SPIDriver* spip, size_t n) {
} }
} }
#else #else
// Without the optimization, use the non-small counterparts instead
#define spiSendSmall(s, n, b) spiSend(s, n, b) #define spiSendSmall(s, n, b) spiSend(s, n, b)
#define spiReceiveSmall(s, n, b) spiReceive(s, n, b) #define spiReceiveSmall(s, n, b) spiReceive(s, n, b)
#define spiIgnoreSmall(s, n) spiIgnore(s, n) #define spiIgnoreSmall(s, n) spiIgnore(s, n)