diff --git a/Marlin/src/HAL/DUE/HAL_SPI.cpp b/Marlin/src/HAL/DUE/HAL_SPI.cpp index f42e8a9802..758640285b 100644 --- a/Marlin/src/HAL/DUE/HAL_SPI.cpp +++ b/Marlin/src/HAL/DUE/HAL_SPI.cpp @@ -240,7 +240,7 @@ } // all the others - static uint32_t spiDelayCyclesX4 = 4 * (F_CPU) / 1000000; // 4µs => 125khz + static uint16_t spiDelayNS = 4000; // 4000ns => 125khz static uint8_t spiTransferX(uint8_t b) { // using Mode 0 int bits = 8; @@ -249,12 +249,12 @@ b <<= 1; // little setup time WRITE(SD_SCK_PIN, HIGH); - DELAY_CYCLES(spiDelayCyclesX4); + DELAY_NS(spiDelayNS); b |= (READ(SD_MISO_PIN) != 0); WRITE(SD_SCK_PIN, LOW); - DELAY_CYCLES(spiDelayCyclesX4); + DELAY_NS(spiDelayNS); } while (--bits); return b; } @@ -510,7 +510,7 @@ spiRxBlock = (pfnSpiRxBlock)spiRxBlockX; break; default: - spiDelayCyclesX4 = ((F_CPU) / 1000000) >> (6 - spiRate) << 2; // spiRate of 2 gives the maximum error with current CPU + spiDelayNS = 4000 >> (6 - spiRate); // spiRate of 2 gives the maximum error with current CPU spiTransferTx = (pfnSpiTransfer)spiTransferX; spiTransferRx = (pfnSpiTransfer)spiTransferX; spiTxBlock = (pfnSpiTxBlock)spiTxBlockX;