diff options
Diffstat (limited to 'iceprog')
| -rw-r--r-- | iceprog/iceprog.c | 99 |
1 files changed, 88 insertions, 11 deletions
diff --git a/iceprog/iceprog.c b/iceprog/iceprog.c index ce1faba..908b5fd 100644 --- a/iceprog/iceprog.c +++ b/iceprog/iceprog.c @@ -42,6 +42,80 @@ static bool verbose = false; static bool ftdic_latency_set = false; static unsigned char ftdi_latency; +/* MPSSE engine command definitions */ +enum mpsse_cmd +{ + /* Mode commands */ + MC_SETB_LOW = 0x80, /* Set Data bits LowByte */ + MC_READB_LOW = 0x81, /* Read Data bits LowByte */ + MC_SETB_HIGH = 0x82, /* Set Data bits HighByte */ + MC_READB_HIGH = 0x83, /* Read data bits HighByte */ + MC_LOOPBACK_EN = 0x84, /* Enable loopback */ + MC_LOOPBACK_DIS = 0x85, /* Disable loopback */ + MC_SET_CLK_DIV = 0x86, /* Set clock divisor */ + MC_FLUSH = 0x87, /* Flush buffer fifos to the PC. */ + MC_WAIT_H = 0x88, /* Wait on GPIOL1 to go high. */ + MC_WAIT_L = 0x89, /* Wait on GPIOL1 to go low. */ + MC_TCK_X5 = 0x8A, /* Disable /5 div, enables 60MHz master clock */ + MC_TCK_D5 = 0x8B, /* Enable /5 div, backward compat to FT2232D */ + MC_EN_3PH_CLK = 0x8C, /* Enable 3 phase clk, DDR I2C */ + MC_DIS_3PH_CLK = 0x8D, /* Disable 3 phase clk */ + MC_CLK_N = 0x8E, /* Clock every bit, used for JTAG */ + MC_CLK_N8 = 0x8F, /* Clock every byte, used for JTAG */ + MC_CLK_TO_H = 0x94, /* Clock until GPIOL1 goes high */ + MC_CLK_TO_L = 0x95, /* Clock until GPIOL1 goes low */ + MC_EN_ADPT_CLK = 0x96, /* Enable adaptive clocking */ + MC_DIS_ADPT_CLK = 0x97, /* Disable adaptive clocking */ + MC_CLK8_TO_H = 0x9C, /* Clock until GPIOL1 goes high, count bytes */ + MC_CLK8_TO_L = 0x9D, /* Clock until GPIOL1 goes low, count bytes */ + MC_TRI = 0x9E, /* Set IO to only drive on 0 and tristate on 1 */ + /* CPU mode commands */ + MC_CPU_RS = 0x90, /* CPUMode read short address */ + MC_CPU_RE = 0x91, /* CPUMode read extended address */ + MC_CPU_WS = 0x92, /* CPUMode write short address */ + MC_CPU_WE = 0x93, /* CPUMode write extended address */ +}; + +/* Transfer Command bits */ + +/* All byte based commands consist of: + * - Command byte + * - Length lsb + * - Length msb + * + * If data out is enabled the data follows after the above command bytes, + * otherwise no additional data is needed. + * - Data * n + * + * All bit based commands consist of: + * - Command byte + * - Length + * + * If data out is enabled a byte containing bitst to transfer follows. + * Otherwise no additional data is needed. Only up to 8 bits can be transferred + * per transaction when in bit mode. + */ + +/* b 0000 0000 + * |||| |||`- Data out negative enable. Update DO on negative clock edge. + * |||| ||`-- Bit count enable. When reset count represents bytes. + * |||| |`--- Data in negative enable. Latch DI on negative clock edge. + * |||| `---- LSB enable. When set clock data out LSB first. + * |||| + * |||`------ Data out enable + * ||`------- Data in enable + * |`-------- TMS mode enable + * `--------- Special command mode enable. See mpsse_cmd enum. + */ + +#define MC_DATA_TMS (0x40) /* When set use TMS mode */ +#define MC_DATA_IN (0x20) /* When set read data (Data IN) */ +#define MC_DATA_OUT (0x10) /* When set write data (Data OUT) */ +#define MC_DATA_LSB (0x08) /* When set input/output data LSB first. */ +#define MC_DATA_ICN (0x04) /* When set receive data on negative clock edge */ +#define MC_DATA_BITS (0x02) /* When set count bits not bytes */ +#define MC_DATA_OCN (0x01) /* When set update data on negative clock edge */ + static void check_rx() { while (1) { @@ -96,7 +170,8 @@ static void send_spi(uint8_t *data, int n) if (n < 1) return; - send_byte(0x11); + /* Output only, update data on negative clock edge. */ + send_byte(MC_DATA_OUT | MC_DATA_OCN); send_byte(n - 1); send_byte((n - 1) >> 8); @@ -112,7 +187,8 @@ static void xfer_spi(uint8_t *data, int n) if (n < 1) return; - send_byte(0x31); + /* Input and output, update data on negative edge read on positive. */ + send_byte(MC_DATA_IN | MC_DATA_OUT | MC_DATA_OCN); send_byte(n - 1); send_byte((n - 1) >> 8); @@ -140,15 +216,15 @@ static void set_gpio(int slavesel_b, int creset_b) gpio |= 0x80; } - send_byte(0x80); - send_byte(gpio); - send_byte(0x93); + send_byte(MC_SETB_LOW); + send_byte(gpio); /* Value */ + send_byte(0x93); /* Direction */ } static int get_cdone() { uint8_t data; - send_byte(0x81); + send_byte(MC_READB_LOW); data = recv_byte(); // ADBUS6 (GPIOL2) return (data & 0x40) != 0; @@ -641,16 +717,17 @@ int main(int argc, char **argv) ftdic_latency_set = true; + /* Enter MPSSE (Multi-Protocol Synchronous Serial Engine) mode. Set all pins to output. */ if (ftdi_set_bitmode(&ftdic, 0xff, BITMODE_MPSSE) < 0) { fprintf(stderr, "Failed to set BITMODE_MPSSE on iCE FTDI USB device.\n"); error(2); } // enable clock divide by 5 - send_byte(0x8b); + send_byte(MC_TCK_D5); // set 6 MHz clock - send_byte(0x86); + send_byte(MC_SET_CLK_DIV); send_byte(0x00); send_byte(0x00); @@ -712,13 +789,13 @@ int main(int argc, char **argv) send_spi(buffer, rc); } - // add 48 dummy bits - send_byte(0x8f); + // add 48 dummy bits (aka 6 bytes) + send_byte(MC_CLK_N8); send_byte(0x05); send_byte(0x00); // add 1 more dummy bit - send_byte(0x8e); + send_byte(MC_CLK_N); send_byte(0x00); fprintf(stderr, "cdone: %s\n", get_cdone() ? "high" : "low"); |