diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/jtag/ft2232.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/jtag/ft2232.c b/src/jtag/ft2232.c index 68de086f..f5453a30 100644 --- a/src/jtag/ft2232.c +++ b/src/jtag/ft2232.c @@ -61,6 +61,8 @@ int ft2232_execute_queue(void); int ft2232_speed(int speed); +int ft2232_speed_div(int speed, int *khz); +int ft2232_khz(int khz, int *jtag_speed); int ft2232_register_commands(struct command_context_s *cmd_ctx); int ft2232_init(void); int ft2232_quit(void); @@ -157,6 +159,9 @@ jtag_interface_t ft2232_interface = .execute_queue = ft2232_execute_queue, .speed = ft2232_speed, + .speed_div = ft2232_speed_div, + .khz = ft2232_khz, + .register_commands = ft2232_register_commands, .init = ft2232_init, .quit = ft2232_quit, @@ -259,6 +264,49 @@ int ft2232_speed(int speed) return ERROR_OK; } +int ft2232_speed_div(int speed, int *khz) +{ + /* + * Take a look in the FT2232 manual, + * AN2232C-01 Command Processor for + * MPSSE and MCU Host Bus. Chapter 3.8 + */ + *khz = 6000 / (1+speed); + + return ERROR_OK; +} + +int ft2232_khz(int khz, int *jtag_speed) +{ + /* + * Take a look in the FT2232 manual, + * AN2232C-01 Command Processor for + * MPSSE and MCU Host Bus. Chapter 3.8 + * + * We will calc here with a multiplier + * of 10 for better rounding later. + */ + + /* Calc speed, (6000 / khz) - 1 */ + *jtag_speed = (60000 / khz) - 10; + + /* Add 0.5 for rounding */ + *jtag_speed += 5; + + /* Calc real speed */ + *jtag_speed = *jtag_speed / 10; + + /* Check if speed is greater than 0 */ + if (*jtag_speed < 0) + { + *jtag_speed = 0; + } + + return ERROR_OK; +} + + + int ft2232_register_commands(struct command_context_s *cmd_ctx) { register_command(cmd_ctx, NULL, "ft2232_device_desc", ft2232_handle_device_desc_command, |