diff options
Diffstat (limited to 'tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL43Z/spi_api.c')
-rw-r--r-- | tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL43Z/spi_api.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL43Z/spi_api.c b/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL43Z/spi_api.c new file mode 100644 index 0000000000..f58fc17703 --- /dev/null +++ b/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Freescale/TARGET_KLXX/TARGET_KL43Z/spi_api.c @@ -0,0 +1,218 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 ARM Limited + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include "mbed_assert.h" +#include "spi_api.h" + +#include <math.h> + +#include "cmsis.h" +#include "pinmap.h" + +static const PinMap PinMap_SPI_SCLK[] = { + {PTC3, SPI_1, 2}, + {PTC5, SPI_0, 2}, + {PTD1, SPI_0, 2}, + {PTD5, SPI_1, 2}, + {NC , NC , 0} +}; + +static const PinMap PinMap_SPI_MOSI[] = { + {PTB16, SPI_1, 2}, + {PTB17, SPI_1, 5}, + {PTC6, SPI_0, 2}, + {PTC7, SPI_0, 5}, + {PTD2, SPI_0, 2}, + {PTD3, SPI_0, 5}, + {PTD6, SPI_1, 2}, + {PTD7, SPI_1, 5}, + {PTE1, SPI_1, 2}, + {NC , NC , 0} +}; + +static const PinMap PinMap_SPI_MISO[] = { + {PTB16, SPI_1, 5}, + {PTB17, SPI_1, 2}, + {PTC6, SPI_0, 5}, + {PTC7, SPI_0, 2}, + {PTD2, SPI_0, 5}, + {PTD3, SPI_0, 2}, + {PTD6, SPI_1, 5}, + {PTD7, SPI_1, 2}, + {PTE0, SPI_1, 2}, + {PTE1, SPI_1, 5}, + {NC , NC , 0} +}; + +static const PinMap PinMap_SPI_SSEL[] = { + {PTC4, SPI_0, 2}, + {PTD0, SPI_0, 2}, + {PTD4, SPI_1, 2}, + {NC , NC , 0} +}; + +void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) { + // determine the SPI to use + SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI); + SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO); + SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK); + SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL); + SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso); + SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel); + + obj->spi = (SPI_Type*)pinmap_merge(spi_data, spi_cntl); + MBED_ASSERT((int)obj->spi != NC); + + // enable power and clocking + switch ((int)obj->spi) { + case SPI_0: SIM->SCGC5 |= 1 << 13; SIM->SCGC4 |= 1 << 22; break; + case SPI_1: SIM->SCGC5 |= 1 << 13; SIM->SCGC4 |= 1 << 23; break; + } + + // set default format and frequency + if (ssel == NC) { + spi_format(obj, 8, 0, 0); // 8 bits, mode 0, master + } else { + spi_format(obj, 8, 0, 1); // 8 bits, mode 0, slave + } + spi_frequency(obj, 1000000); + + // enable SPI + obj->spi->C1 |= SPI_C1_SPE_MASK; + obj->spi->C2 &= ~SPI_C2_SPIMODE_MASK; //8bit + + // pin out the spi pins + pinmap_pinout(mosi, PinMap_SPI_MOSI); + pinmap_pinout(miso, PinMap_SPI_MISO); + pinmap_pinout(sclk, PinMap_SPI_SCLK); + if (ssel != NC) { + pinmap_pinout(ssel, PinMap_SPI_SSEL); + } +} + +void spi_free(spi_t *obj) { + // [TODO] +} + +void spi_format(spi_t *obj, int bits, int mode, int slave) { + MBED_ASSERT((bits == 8) || (bits == 16)); + MBED_ASSERT((mode >= 0) && (mode <= 3)); + + uint8_t polarity = (mode & 0x2) ? 1 : 0; + uint8_t phase = (mode & 0x1) ? 1 : 0; + uint8_t c1_data = ((!slave) << 4) | (polarity << 3) | (phase << 2); + + // clear MSTR, CPOL and CPHA bits + obj->spi->C1 &= ~(0x7 << 2); + + // write new value + obj->spi->C1 |= c1_data; + if (bits == 8) { + obj->spi->C2 &= ~SPI_C2_SPIMODE_MASK; + } else { + obj->spi->C2 |= SPI_C2_SPIMODE_MASK; + } +} + +void spi_frequency(spi_t *obj, int hz) { + uint32_t error = 0; + uint32_t p_error = 0xffffffff; + uint32_t ref = 0; + uint8_t spr = 0; + uint8_t ref_spr = 0; + uint8_t ref_prescaler = 0; + + // bus clk + uint32_t PCLK = SystemCoreClock / (((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV4_MASK) >> SIM_CLKDIV1_OUTDIV4_SHIFT) + 1); + uint8_t prescaler = 1; + uint8_t divisor = 2; + + for (prescaler = 1; prescaler <= 8; prescaler++) { + divisor = 2; + for (spr = 0; spr <= 8; spr++, divisor *= 2) { + ref = PCLK / (prescaler*divisor); + if (ref > (uint32_t)hz) + continue; + error = hz - ref; + if (error < p_error) { + ref_spr = spr; + ref_prescaler = prescaler - 1; + p_error = error; + } + } + } + + // set SPPR and SPR + obj->spi->BR = ((ref_prescaler & 0x7) << 4) | (ref_spr & 0xf); +} + +static inline int spi_writeable(spi_t * obj) { + return (obj->spi->S & SPI_S_SPTEF_MASK) ? 1 : 0; +} + +static inline int spi_readable(spi_t * obj) { + return (obj->spi->S & SPI_S_SPRF_MASK) ? 1 : 0; +} + +int spi_master_write(spi_t *obj, int value) { + int ret; + if (obj->spi->C2 & SPI_C2_SPIMODE_MASK) { + // 16bit + while(!spi_writeable(obj)); + obj->spi->DL = (value & 0xff); + obj->spi->DH = ((value >> 8) & 0xff); + + // wait rx buffer full + while (!spi_readable(obj)); + ret = obj->spi->DH; + ret = (ret << 8) | obj->spi->DL; + } else { + //8bit + while(!spi_writeable(obj)); + obj->spi->DL = (value & 0xff); + + // wait rx buffer full + while (!spi_readable(obj)); + ret = (obj->spi->DL & 0xff); + } + + return ret; +} + +int spi_slave_receive(spi_t *obj) { + return spi_readable(obj); +} + +int spi_slave_read(spi_t *obj) { + int ret; + if (obj->spi->C2 & SPI_C2_SPIMODE_MASK) { + ret = obj->spi->DH; + ret = ((ret << 8) | obj->spi->DL); + } else { + ret = obj->spi->DL; + } + return ret; +} + +void spi_slave_write(spi_t *obj, int value) { + while (!spi_writeable(obj)); + if (obj->spi->C2 & SPI_C2_SPIMODE_MASK) { + obj->spi->DL = (value & 0xff); + obj->spi->DH = ((value >> 8) & 0xff); + } else { + obj->spi->DL = value; + } + +} |