diff options
Diffstat (limited to 'libmaple/fsmc.c')
| -rw-r--r-- | libmaple/fsmc.c | 53 |
1 files changed, 4 insertions, 49 deletions
diff --git a/libmaple/fsmc.c b/libmaple/fsmc.c index 1561add..70d7e0d 100644 --- a/libmaple/fsmc.c +++ b/libmaple/fsmc.c @@ -33,19 +33,10 @@ #ifdef STM32_HIGH_DENSITY -/* These values determined for a particular SRAM chip by following the - * calculations in the ST FSMC application note. */ -#define FSMC_ADDSET 0x0 -#define FSMC_DATAST 0x3 - -/* Sets up the FSMC peripheral to use the SRAM chip on the maple - * native as an external segment of system memory space. This - * implementation is for the IS62WV51216BLL 8mbit chip (55ns - * timing) */ -void fsmc_native_sram_init(void) { - FSMC_Bank *bank; - - /* First we setup all the GPIO pins. */ +/** + * Configure FSMC GPIOs for use with SRAM. + */ +void fsmc_sram_init_gpios(void) { /* Data lines... */ gpio_set_mode(GPIOD, 0, GPIO_AF_OUTPUT_PP); gpio_set_mode(GPIOD, 1, GPIO_AF_OUTPUT_PP); @@ -96,42 +87,6 @@ void fsmc_native_sram_init(void) { gpio_set_mode(GPIOE, 0, GPIO_AF_OUTPUT_PP); // NBL0 gpio_set_mode(GPIOE, 1, GPIO_AF_OUTPUT_PP); // NBL1 - - /* Next enable the clock */ - rcc_clk_enable(RCC_FSMC); - - /* Then we configure channel 1 the FSMC SRAM peripheral (all SRAM - * channels are in "Bank 1" of the FSMC) */ - bank = (FSMC_Bank*)(FSMC1_BASE); - - /* Everything else is cleared (BCR1) */ - bank->BCR = 0x0000; - - /* Memory type is SRAM */ - bank->BCR &= ~(FSMC_BCR_MTYP); // '00' - - /* Databus width is 16bits */ - bank->BCR &= ~(FSMC_BCR_MWID); - bank->BCR |= 0x1 << 4; // '01' - - /* Memory is nonmultiplexed */ - bank->BCR &= ~(FSMC_BCR_MUXEN); // '0' - - /* Need write enable to write to the chip */ - bank->BCR |= FSMC_BCR_WREN; - - /* Set ADDSET */ - bank->BTR &= ~(FSMC_BTR_ADDSET); - bank->BTR |= (FSMC_BTR_ADDSET | FSMC_ADDSET); - - /* Set DATAST */ - bank->BTR &= ~(FSMC_BTR_DATAST); - bank->BTR |= (FSMC_BTR_DATAST | (FSMC_DATAST << 8)); - - /* Enable channel 1 */ - bank->BCR |= FSMC_BCR_MBKEN; // '1' - - /* (FSMC_BWTR3 not used for this simple configuration.) */ } #endif /* STM32_HIGH_DENSITY */ |