Posted on May 17, 2011 at 12:41 I am not seeing what is going on here. ADC1 has been told by Timer 2 CC2 to start converting. And it does. Once. Yet Timer2 CC2 is working because I set an interrupt on it. Debugger breakpoints in my dummy Timer 2 handler with only CC2 enabled to interrupt. I have to clear the breakpoint to get much of anything else done.
If my code snippets fail to display as code then they will be most difficult to follow.
;** turn on various ports
;
; +-----------------ADC3 = 0
; |+----------------USART1 = 0 (for now)
; ||+---------------TIMER 8 =0
; |||+--------------SPI1 = 0 (for now...)
; ||||+-------------TIMER 1 = 0
; |||||+------------ADC2 = 0
; ||||||+-----------ADC1 = 1
; |||||||+----------PORT G = 0
; ||||||||+---------PORT F = 0
; |||||||||+--------PORT E = 0
; ||||||||||+-------PORT D = 1
; |||||||||||+------PORT C = 1
; ||||||||||||+-----PORT B = 1
; |||||||||||||+----PORT A = 1
; ||||||||||||||x+--AFIO = 0
movs r0,0000001000111100b
ldr r4,=baseRCC
str r0,[r4,RCC_APB2ENR]
;** setup GPIO port A for analog input on PA4/5 (is ADC12_4/5)
ldr r0,=basePORTA
; 76543210 (for GPIO_CRL)
ldr r1,=0x44004444
str r1,[r0,GPIO_CRL]
;** setup ADC1 to convert 2 channels on tmr2-CC2 **
ldr r0,=baseADC1
ldr r1,=0x2920 ;enable EOC int & set scan mode & convert 2 chans
mov r1,0x120 ;okay, try this
str r1,[r0,ADC_CR1]
ldr r1,=0x00160801 ;sets tmr2_CC2, left align & enable
str r1,[r0,ADC_CR2]
movs r1,0x09 ;samps 0&1 1.5 (+5) -> 14 clocks...
str r1,[r0,ADC_SMPR2] ;... of 9 MHz = less than 2 uSec / channel
movs r1,0x00100000 ;only 2 samples
str r1,[r0,ADC_SQR1]
movs r1,(4<<0)+(5<
str r1,[r0,ADC_SQR3]
;-------------------------------------------------------------------------------
; ADC ISR
;
; Entered after both ADC conversions are done
;
ADC12
ldr r0,=baseADC1
movs r1,0
str r1,[r0,ADC_SR] ;kill ADC start flag & others we dont care about
ldr r1,[r0,ADC_DR] ;data (I know I need DMA to read both samples)
bx lr
Perhaps someone will see my problem from what I believe to be the relevant code.
I also need directions about how to post bits of code.
