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increase SD card speed (#2333) 

* fast sd card

* fair enough
This commit is contained in:
Matthew Kennedy 2021-02-11 17:42:23 -08:00 committed by GitHub
parent 94ae78ee92
commit 275b058e32
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 9 additions and 2 deletions
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11
firmware/hw_layer/mmc_card.cpp
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@ -84,19 +84,26 @@ static THD_WORKING_AREA(mmcThreadStack,3 * UTILITY_THREAD_STACK_SIZE); // MMC m
*/
MMCDriver MMCD1;
// SD cards are good up to 25MHz in "slow" mode, and 50MHz in "fast" mode
// 168mhz F4:
// Slow mode is 10.5 or 5.25 MHz, depending on which SPI device
// Fast mode is 42 or 21 MHz
// 216mhz F7:
// Slow mode is 13.5 or 6.75 MHz
// Fast mode is 54 or 27 MHz (technically out of spec, needs testing!)
static SPIConfig hs_spicfg = {
.circular = false,
.end_cb = NULL,
.ssport = NULL,
.sspad = 0,
.cr1 = SPI_BaudRatePrescaler_8,
.cr1 = SPI_BaudRatePrescaler_2,
.cr2 = 0};
static SPIConfig ls_spicfg = {
.circular = false,
.end_cb = NULL,
.ssport = NULL,
.sspad = 0,
.cr1 = SPI_BaudRatePrescaler_256,
.cr1 = SPI_BaudRatePrescaler_8,
.cr2 = 0};
/* MMC/SD over SPI driver configuration.*/