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spring: Configure ADC pins

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ADC pins should be configured as analog input pins. Also sets conversion
factor to obtain voltage values in mV.

BUG=chrome-os-partner:14319
TEST=Manual
BRANCH=none

Change-Id: I7e084052062c2b669f10da4309e99bf9e2954ded
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/40199
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Vic Yang
2012-12-25 11:02:04 +08:00
committed by ChromeBot
parent 40c79398a6
commit 5019591f68
1 changed files with 7 additions and 4 deletions
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11
board/spring/board.c
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@@ -106,10 +106,10 @@ const struct adc_t adc_channels[ADC_CH_COUNT] = {
* voltage divider, the conversion factor is 6600mV/4096.
*/
[ADC_CH_USB_VBUS_SNS] = {"USB_VBUS_SNS", 6600, 4096, 0, STM32_AIN(5)},
/* Micro USB D+ sense pin. Raw ADC value. */
[ADC_CH_USB_DP_SNS] = {"USB_DP_SNS", 1, 1, 0, STM32_AIN(2)},
/* Micro USB D- sense pin. Raw ADC value. */
[ADC_CH_USB_DN_SNS] = {"USB_DN_SNS", 1, 1, 0, STM32_AIN(4)},
/* Micro USB D+ sense pin. Converted to mV (3300mV/4096). */
[ADC_CH_USB_DP_SNS] = {"USB_DP_SNS", 3300, 4096, 0, STM32_AIN(2)},
/* Micro USB D- sense pin. Converted to mV (3300mV/4096). */
[ADC_CH_USB_DN_SNS] = {"USB_DN_SNS", 3300, 4096, 0, STM32_AIN(4)},
};
void configure_board(void)
@@ -137,6 +137,9 @@ void configure_board(void)
STM32_GPIO_AFIO_MAPR = (STM32_GPIO_AFIO_MAPR & ~(0x3 << 10))
| (2 << 10);
/* Analog input for ADC pins (PA2, PA4, PA5) */
STM32_GPIO_CRL_OFF(GPIO_A) &= ~0x00ff0f00;
/*
* Set alternate function for USART1. For alt. function input
* the port is configured in either floating or pull-up/down