Hi, I have an analog design in with output at mprj_io[16], mprj_io[17] in my project (MPW6). I have programmed both of them in ``GPIO_MODE_USER_STD_ANALOG` in gpio_test.c`gmode in the and flashed the gpio_test.c program. Still I am seeing pulse signal from mprj_io[17] pin. Could you please suggest what I can do to achieve the expected analog signal output from the GPIO pin in analog mode? @Tim Edwards @Matt Venn

Can you post your test C code?

#include defs.h // -------------------------------------------------------- // Firmware routines // -------------------------------------------------------- void delay(const int d) { /* Configure timer for a single-shot countdown */ reg_timer0_config = 0; reg_timer0_data = d; reg_timer0_config = 1; // Loop, waiting for value to reach zero reg_timer0_update = 1; // latch current value while (reg_timer0_value > 0) { reg_timer0_update = 1; } } void set_registers() { reg_mprj_io_0 = GPIO_MODE_MGMT_STD_ANALOG; // Changing configuration for IO[1-4] will interfere with programming flash. if you change them, // You may need to hold reset while powering up the board and initiating flash to keep the process // configuring these IO from their default values. reg_mprj_io_1 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_2 = GPIO_MODE_MGMT_STD_INPUT_NOPULL; reg_mprj_io_3 = GPIO_MODE_MGMT_STD_INPUT_NOPULL; reg_mprj_io_4 = GPIO_MODE_MGMT_STD_INPUT_NOPULL; // ------------------------------------------- reg_mprj_io_5 = GPIO_MODE_MGMT_STD_INPUT_NOPULL; reg_mprj_io_6 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_7 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_8 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_9 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_10 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_11 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_12 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_13 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_14 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_15 = GPIO_MODE_MGMT_STD_OUTPUT; _*reg_mprj_io_16 = GPIO_MODE_USER_STD_ANALOG;*_ _*reg_mprj_io_17 = GPIO_MODE_USER_STD_ANALOG;*_ reg_mprj_io_18 = GPIO_MODE_MGMT_STD_OUTPUT; _*reg_mprj_io_19 = GPIO_MODE_USER_STD_ANALOG;*_ _*reg_mprj_io_20 = GPIO_MODE_USER_STD_ANALOG;*_ _*reg_mprj_io_21 = GPIO_MODE_USER_STD_ANALOG;*_ _*reg_mprj_io_22 = GPIO_MODE_USER_STD_ANALOG*_; reg_mprj_io_23 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_24 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_25 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_26 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_27 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_28 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_29 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_30 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_31 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_32 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_33 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_34 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_35 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_36 = GPIO_MODE_MGMT_STD_OUTPUT; reg_mprj_io_37 = GPIO_MODE_MGMT_STD_OUTPUT; } void main() { reg_gpio_mode1 = 1; reg_gpio_mode0 = 0; reg_gpio_ien = 1; reg_gpio_oe = 1; set_registers(); reg_mprj_datah = 0; reg_mprj_datal = 0; // gpio_config_io(); reg_mprj_xfer = 1; while (reg_mprj_xfer == 1); reg_gpio_out = 1; // OFF while(1) { reg_mprj_datal = 0x00000000; reg_mprj_datah = 0x00000000; reg_gpio_out = 0x0; delay(1000000); reg_mprj_datal = 0xffffffff; reg_mprj_datah = 0xffffffff; reg_gpio_out = 0x1; delay(1000000); } } @Tim Edwards

Where is the

defs.h

file that you are including, and what value does it assign to the macro

GPIO_MODE_USER_STD_ANALOG

? The value should be

0x000a

. The

defs.h

should be the one in the caravel_board repository under

firmware/chipignite.defs.h

. However, I don't see anything wrong with the code, and there are a number of different ways to specify a configuration that disables the input and output buffers and therefore sets analog mode.