diff options
Diffstat (limited to 'src/stm-fmc.c')
| -rw-r--r-- | src/stm-fmc.c | 325 |
1 files changed, 0 insertions, 325 deletions
diff --git a/src/stm-fmc.c b/src/stm-fmc.c deleted file mode 100644 index 19b7fdc..0000000 --- a/src/stm-fmc.c +++ /dev/null @@ -1,325 +0,0 @@ -//------------------------------------------------------------------------------ -// stm-fmc.c -//------------------------------------------------------------------------------ - - -//------------------------------------------------------------------------------ -// Headers -//------------------------------------------------------------------------------ -#include "stm-fmc.h" -#include "stm32f4xx_hal.h" - - -//------------------------------------------------------------------------------ -// Defined Values -//------------------------------------------------------------------------------ -#define FMC_FPGA_BASE_ADDR 0x60000000 -#define FMC_FPGA_ADDR_MASK 0x00FFFFFC -#define FMC_FPGA_NWAIT_MAX_POLL_TICKS 10 - -#define FMC_GPIO_PORT_NWAIT GPIOD -#define FMC_GPIO_PIN_NWAIT GPIO_PIN_6 - -#define FMC_NWAIT_IDLE GPIO_PIN_SET - - -//------------------------------------------------------------------------------ -// Variables -//------------------------------------------------------------------------------ -static SRAM_HandleTypeDef _fmc_fpga_inst; - - -//------------------------------------------------------------------------------ -// Prototypes -//------------------------------------------------------------------------------ -static void _fmc_init_gpio(void); -static void _fmc_init_params(void); -static int _fmc_nwait_idle(void); - - -//------------------------------------------------------------------------------ -void fmc_init(void) -//------------------------------------------------------------------------------ -{ - // configure fmc pins - _fmc_init_gpio(); - - // configure fmc registers - _fmc_init_params(); -} - - -//------------------------------------------------------------------------------ -int fmc_write_32(uint32_t addr, uint32_t *data) -//------------------------------------------------------------------------------ -{ - // calculate target fpga address - uint32_t ptr = FMC_FPGA_BASE_ADDR + (addr & FMC_FPGA_ADDR_MASK); - - // write data to fpga - HAL_StatusTypeDef ok = HAL_SRAM_Write_32b(&_fmc_fpga_inst, (uint32_t *)ptr, data, 1); - - // check for error - if (ok != HAL_OK) return -1; - - // wait for transaction to complete - int wait = _fmc_nwait_idle(); - - // check for timeout - if (wait != 0) return -1; - - // everything went ok - return 0; -} - - -//------------------------------------------------------------------------------ -int fmc_read_32(uint32_t addr, uint32_t *data) -//------------------------------------------------------------------------------ -{ - // calculate target fpga address - uint32_t ptr = FMC_FPGA_BASE_ADDR + (addr & FMC_FPGA_ADDR_MASK); - - // perform dummy read transaction - HAL_StatusTypeDef ok = HAL_SRAM_Read_32b(&_fmc_fpga_inst, (uint32_t *)ptr, data, 1); - - // check for error - if (ok != HAL_OK) return -1; - - // wait for dummy transaction to complete - int wait = _fmc_nwait_idle(); - - // check for timeout - if (wait != 0) return -1; - - // read data from fpga - ok = HAL_SRAM_Read_32b(&_fmc_fpga_inst, (uint32_t *)ptr, data, 1); - - // check for error - if (ok != HAL_OK) return -1; - - // wait for read transaction to complete - wait = _fmc_nwait_idle(); - - // check for timeout - if (wait != 0) return -1; - - // everything went ok - return 0; -} - - -//------------------------------------------------------------------------------ -static int _fmc_nwait_idle() -//------------------------------------------------------------------------------ -{ - int cnt; // counter - - // poll NWAIT (number of iterations is limited) - for (cnt=0; cnt<FMC_FPGA_NWAIT_MAX_POLL_TICKS; cnt++) - { - // read pin state - GPIO_PinState nwait = HAL_GPIO_ReadPin(FMC_GPIO_PORT_NWAIT, FMC_GPIO_PIN_NWAIT); - - // stop waiting if fpga is ready - if (nwait == FMC_NWAIT_IDLE) break; - } - - // check for timeout - if (cnt >= FMC_FPGA_NWAIT_MAX_POLL_TICKS) return -1; - - // ok - return 0; -} - -//------------------------------------------------------------------------------ -static void _fmc_init_gpio(void) -//------------------------------------------------------------------------------ -{ - // enable gpio clocks - __GPIOA_CLK_ENABLE(); - __GPIOB_CLK_ENABLE(); - __GPIOD_CLK_ENABLE(); - __GPIOE_CLK_ENABLE(); - __GPIOF_CLK_ENABLE(); - __GPIOG_CLK_ENABLE(); - __GPIOH_CLK_ENABLE(); - __GPIOI_CLK_ENABLE(); - - // enable fmc clock - __FMC_CLK_ENABLE(); - - // structure - GPIO_InitTypeDef GPIO_InitStruct; - - // Port B - GPIO_InitStruct.Pin = GPIO_PIN_7; - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; - GPIO_InitStruct.Pull = GPIO_NOPULL; - GPIO_InitStruct.Speed = GPIO_SPEED_HIGH; - GPIO_InitStruct.Alternate = GPIO_AF12_FMC; - HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); - - // Port D - GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11 - |GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15 - |GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_3|GPIO_PIN_4 - |GPIO_PIN_5|GPIO_PIN_7; - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; - GPIO_InitStruct.Pull = GPIO_NOPULL; - GPIO_InitStruct.Speed = GPIO_SPEED_HIGH; - GPIO_InitStruct.Alternate = GPIO_AF12_FMC; - HAL_GPIO_Init(GPIOD, &GPIO_InitStruct); - - /* - * When FMC is working with fixed latency, NWAIT pin must not be - * configured in AF mode, according to STM32F429 errata. - */ - - // Port D (GPIO!) - GPIO_InitStruct.Pin = GPIO_PIN_6; - GPIO_InitStruct.Mode = GPIO_MODE_INPUT; - GPIO_InitStruct.Pull = GPIO_PULLUP; - HAL_GPIO_Init(GPIOD, &GPIO_InitStruct); - - // Port E - GPIO_InitStruct.Pin = GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_7 - |GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11 - |GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15; - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; - GPIO_InitStruct.Pull = GPIO_NOPULL; - GPIO_InitStruct.Speed = GPIO_SPEED_HIGH; - GPIO_InitStruct.Alternate = GPIO_AF12_FMC; - HAL_GPIO_Init(GPIOE, &GPIO_InitStruct); - - // Port F - GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3 - |GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_12|GPIO_PIN_13 - |GPIO_PIN_14|GPIO_PIN_15; - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; - GPIO_InitStruct.Pull = GPIO_NOPULL; - GPIO_InitStruct.Speed = GPIO_SPEED_HIGH; - GPIO_InitStruct.Alternate = GPIO_AF12_FMC; - HAL_GPIO_Init(GPIOF, &GPIO_InitStruct); - - // Port G - GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3 - |GPIO_PIN_4|GPIO_PIN_5; - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; - GPIO_InitStruct.Pull = GPIO_NOPULL; - GPIO_InitStruct.Speed = GPIO_SPEED_HIGH; - GPIO_InitStruct.Alternate = GPIO_AF12_FMC; - HAL_GPIO_Init(GPIOG, &GPIO_InitStruct); - - // Port H - GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11 - |GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15; - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; - GPIO_InitStruct.Pull = GPIO_NOPULL; - GPIO_InitStruct.Speed = GPIO_SPEED_HIGH; - GPIO_InitStruct.Alternate = GPIO_AF12_FMC; - HAL_GPIO_Init(GPIOH, &GPIO_InitStruct); - - // Port I - GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_0|GPIO_PIN_1 - |GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_6|GPIO_PIN_7; - GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; - GPIO_InitStruct.Pull = GPIO_NOPULL; - GPIO_InitStruct.Speed = GPIO_SPEED_HIGH; - GPIO_InitStruct.Alternate = GPIO_AF12_FMC; - HAL_GPIO_Init(GPIOI, &GPIO_InitStruct); -} - - -//------------------------------------------------------------------------------ -static void _fmc_init_params(void) -//------------------------------------------------------------------------------ -{ - /* - * fill internal fields - */ - _fmc_fpga_inst.Instance = FMC_NORSRAM_DEVICE; - _fmc_fpga_inst.Extended = FMC_NORSRAM_EXTENDED_DEVICE; - - - /* - * configure fmc interface settings - */ - - // use the first bank and corresponding chip select - _fmc_fpga_inst.Init.NSBank = FMC_NORSRAM_BANK1; - - // data and address buses are separate - _fmc_fpga_inst.Init.DataAddressMux = FMC_DATA_ADDRESS_MUX_DISABLE; - - // fpga mimics psram-type memory - _fmc_fpga_inst.Init.MemoryType = FMC_MEMORY_TYPE_PSRAM; - - // data bus is 32-bit - _fmc_fpga_inst.Init.MemoryDataWidth = FMC_NORSRAM_MEM_BUS_WIDTH_32; - - // read transaction is sync - _fmc_fpga_inst.Init.BurstAccessMode = FMC_BURST_ACCESS_MODE_ENABLE; - - // this _must_ be configured to high, according to errata, otherwise - // the processor may hang after trying to access fpga via fmc - _fmc_fpga_inst.Init.WaitSignalPolarity = FMC_WAIT_SIGNAL_POLARITY_HIGH; - - // wrap mode is not supported - _fmc_fpga_inst.Init.WrapMode = FMC_WRAP_MODE_DISABLE; - - // don't care in fixed latency mode - _fmc_fpga_inst.Init.WaitSignalActive = FMC_WAIT_TIMING_DURING_WS; - - // allow write access to fpga - _fmc_fpga_inst.Init.WriteOperation = FMC_WRITE_OPERATION_ENABLE; - - // use fixed latency mode (ignore wait signal) - _fmc_fpga_inst.Init.WaitSignal = FMC_WAIT_SIGNAL_DISABLE; - - // write and read have same timing - _fmc_fpga_inst.Init.ExtendedMode = FMC_EXTENDED_MODE_DISABLE; - - // don't care in sync mode - _fmc_fpga_inst.Init.AsynchronousWait = FMC_ASYNCHRONOUS_WAIT_DISABLE; - - // write transaction is sync - _fmc_fpga_inst.Init.WriteBurst = FMC_WRITE_BURST_ENABLE; - - // keep clock always active - _fmc_fpga_inst.Init.ContinuousClock = FMC_CONTINUOUS_CLOCK_SYNC_ASYNC; - - /* - * configure fmc timing parameters - */ - FMC_NORSRAM_TimingTypeDef fmc_timing; - - // don't care in sync mode - fmc_timing.AddressSetupTime = 15; - - // don't care in sync mode - fmc_timing.AddressHoldTime = 15; - - // don't care in sync mode - fmc_timing.DataSetupTime = 255; - - // not needed, since nwait will be polled manually - fmc_timing.BusTurnAroundDuration = 0; - - // use smallest allowed divisor for best performance - fmc_timing.CLKDivision = 2; - - // stm is too slow to work with min allowed 2-cycle latency - fmc_timing.DataLatency = 3; - - // don't care in sync mode - fmc_timing.AccessMode = FMC_ACCESS_MODE_A; - - // initialize fmc - HAL_SRAM_Init(&_fmc_fpga_inst, &fmc_timing, NULL); -} - - -//------------------------------------------------------------------------------ -// EOF -//------------------------------------------------------------------------------ |