Hi Jayant, Have you added the ADC IO package (CYGPKG_IO_ADC) ?
CYGHWR_HAL_STM32_GPIO_IN is only relevant for digital IOs. To read ADC channels, you must use cyg_io_lookup / cyg_io_read. Have a look at some of the ADC test applications for AT91 or LPC24xx. Hope this helps. Christophe -----Original Message----- From: ecos-discuss-ow...@ecos.sourceware.org [mailto:ecos-discuss-ow...@ecos.sourceware.org] On Behalf Of jayant biswas Sent: 12. april 2011 17:27 To: ecos-discuss@ecos.sourceware.org Subject: [ECOS] stm3210e eval board adc question Hello everyone! I am new to this list and to ecos and the stm32 and am looking for some help in reading from ADC inputs. Here is the test program I have used to see if I can read the inputs. I am able to read the normal input from the user key on the board, but I am not able to read the analog input. pot_val is always 0. I test my program by holding on to the user key and changing the potentiometer position and then hitting reset. Do you have any ideas? /* this is a simple hello world program */ #include <stdio.h> #include <cyg/hal/hal_io.h> #define CYGHWR_POT CYGHWR_HAL_STM32_GPIO(C, 4, IN, ANALOG) #define CYGHWR_BUT CYGHWR_HAL_STM32_GPIO(G, 8, IN, FLOATING) int cyg_user_start(void) { cyg_int32 pot_val = 10; cyg_int32 but_val = 10; printf("Hello, eCos world!\n"); CYGHWR_HAL_STM32_GPIO_SET(CYGHWR_POT); CYGHWR_HAL_STM32_GPIO_SET(CYGHWR_BUT); CYGHWR_HAL_STM32_GPIO_IN(CYGHWR_POT, &pot_val); CYGHWR_HAL_STM32_GPIO_IN(CYGHWR_BUT, &but_val); printf("Potentiometer value is %d, button value is %d\n", pot_val, but_val); while(1); return 0; } I wasn't able to enable the cdl component CYGPKG_IO_ADC_DEVICES in my ecos config as it wasn't available. I have an STM3210E Eval board and am using it with an Amontec JTAG key. I used the default stm3210e template and changed the target to ROM. I load the program directly to the ROM so I am not using anything like Redboot. Thank you in advance for your help! Jayant -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss