Frank Bösing
6 years ago
1 changed files with 1 additions and 10 deletions
+ 1
- 10
teensy3/SPIFIFO.h
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| // The preferred way to set SPI speed is with SPI.beginTransaction() | // The preferred way to set SPI speed is with SPI.beginTransaction() | ||||
| #if F_BUS == 128000000 | |||||
| #define HAS_SPIFIFO | |||||
| #define SPI_CLOCK_24MHz (SPI_CTAR_PBR(1) | SPI_CTAR_BR(0)) //(128 / 3) * ((1+0)/2) = 21.3MHz | |||||
| #define SPI_CLOCK_16MHz (SPI_CTAR_PBR(0) | SPI_CTAR_BR(2)) //(128 / 2) * ((1+0)/4) | |||||
| #define SPI_CLOCK_12MHz (SPI_CTAR_PBR(1) | SPI_CTAR_BR(2)) //(128 / 3) * ((1+0)/4) = 10.6 MHz | |||||
| #define SPI_CLOCK_8MHz (SPI_CTAR_PBR(0) | SPI_CTAR_BR(6)) //(128 / 2) * ((1+0)/8) | |||||
| #define SPI_CLOCK_6MHz (SPI_CTAR_PBR(1) | SPI_CTAR_BR(6)) //(128 / 3) * ((1+0)/8) = 5.3 MHz | |||||
| #define SPI_CLOCK_4MHz (SPI_CTAR_PBR(3) | SPI_CTAR_BR(6)) //(128 / 5) * ((1+0)/8) = 3.2MHz | |||||
| #elif F_BUS == 120000000 | |||||
| #if F_BUS == 120000000 | |||||
| #define HAS_SPIFIFO | #define HAS_SPIFIFO | ||||
| #define SPI_CLOCK_24MHz (SPI_CTAR_PBR(3) | SPI_CTAR_BR(0) | SPI_CTAR_DBR) //(120 / 5) * ((1+1)/2) | #define SPI_CLOCK_24MHz (SPI_CTAR_PBR(3) | SPI_CTAR_BR(0) | SPI_CTAR_DBR) //(120 / 5) * ((1+1)/2) | ||||
| #define SPI_CLOCK_16MHz (SPI_CTAR_PBR(0) | SPI_CTAR_BR(2)) //(120 / 2) * ((1+0)/4) = 15 MHz | #define SPI_CLOCK_16MHz (SPI_CTAR_PBR(0) | SPI_CTAR_BR(2)) //(120 / 2) * ((1+0)/4) = 15 MHz |
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