66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
#include "parallel_nand_port_tms320f2812.h"
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#include "DSP281x_Device.h"
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/* C28x addresses are 16-bit word addresses. XA0/XA1 drive CLE/ALE. */
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#define PNAND_TMS_DATA_REG (*(volatile unsigned int *)0x100000UL)
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#define PNAND_TMS_CMD_REG (*(volatile unsigned int *)0x100001UL)
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#define PNAND_TMS_ADDR_REG (*(volatile unsigned int *)0x100002UL)
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#ifndef PNAND_TMS_CPU_MHZ
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#define PNAND_TMS_CPU_MHZ 150UL
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#endif
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static void tms_delay_us(unsigned long us)
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{
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volatile unsigned long loops = us * (PNAND_TMS_CPU_MHZ / 5UL);
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while (loops-- != 0UL) asm(" NOP");
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}
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static int tms_init(void)
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{
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EALLOW;
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GpioMuxRegs.GPEMUX.bit.XINT1_XBIO_GPIOE0 = 0;
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GpioMuxRegs.GPEDIR.bit.GPIOE0 = 0;
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XintfRegs.XINTCNF2.bit.XTIMCLK = 1;
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XintfRegs.XINTCNF2.bit.WRBUFF = 0;
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XintfRegs.XINTCNF2.bit.CLKOFF = 0;
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XintfRegs.XINTCNF2.bit.CLKMODE = 1;
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XintfRegs.XTIMING6.bit.XWRLEAD = 3;
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XintfRegs.XTIMING6.bit.XWRACTIVE = 7;
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XintfRegs.XTIMING6.bit.XWRTRAIL = 3;
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XintfRegs.XTIMING6.bit.XRDLEAD = 3;
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XintfRegs.XTIMING6.bit.XRDACTIVE = 7;
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XintfRegs.XTIMING6.bit.XRDTRAIL = 3;
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XintfRegs.XTIMING6.bit.USEREADY = 0;
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XintfRegs.XTIMING6.bit.READYMODE = 0;
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XintfRegs.XTIMING6.bit.XSIZE = 3;
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EDIS;
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asm(" RPT #7 || NOP");
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return 0;
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}
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static void tms_select(void) { /* XZCS6AND7 формируется каждым доступом. */ }
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static void tms_deselect(void) { }
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static void tms_write_command(pnand_octet_t v) { PNAND_TMS_CMD_REG = v & 0xFFU; }
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static void tms_write_address(pnand_octet_t v) { PNAND_TMS_ADDR_REG = v & 0xFFU; }
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static void tms_write_data(pnand_octet_t v) { PNAND_TMS_DATA_REG = v & 0xFFU; }
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static pnand_octet_t tms_read_data(void) { return PNAND_TMS_DATA_REG & 0xFFU; }
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static int tms_is_ready(void) { return GpioDataRegs.GPEDAT.bit.GPIOE0 != 0; }
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static void tms_set_wp(int enabled)
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{
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/* Шаблон платы фиксирует WP# аппаратно. См. README порта. */
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(void)enabled;
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}
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static const parallel_nand_port_t tms_port = {
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tms_init, tms_select, tms_deselect,
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tms_write_command, tms_write_address, tms_write_data,
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tms_read_data, tms_is_ready, tms_set_wp, tms_delay_us
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};
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const parallel_nand_port_t *parallel_nand_port_tms320f2812(void)
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{
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return &tms_port;
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}
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