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-rw-r--r--src/target/arm_adi_v5.c57
1 files changed, 42 insertions, 15 deletions
diff --git a/src/target/arm_adi_v5.c b/src/target/arm_adi_v5.c
index 435d6597..41f00ec0 100644
--- a/src/target/arm_adi_v5.c
+++ b/src/target/arm_adi_v5.c
@@ -866,14 +866,16 @@ int mem_ap_write_buf_u8(struct swjdp_common *swjdp, uint8_t *buffer, int count,
return retval;
}
-/*********************************************************************************
-* *
-* mem_ap_read_buf_u32(struct swjdp_common *swjdp, uint8_t *buffer, int count, uint32_t address) *
-* *
-* Read block fast in target order (little endian) into a buffer *
-* *
-**********************************************************************************/
-int mem_ap_read_buf_u32(struct swjdp_common *swjdp, uint8_t *buffer, int count, uint32_t address)
+/**
+ * Synchronously read a block of 32-bit words into a buffer
+ * @param swjdp The DAP connected to the MEM-AP.
+ * @param buffer where the words will be stored (in host byte order).
+ * @param count How many words to read.
+ * @param address Memory address from which to read words; all the
+ * words must be readable by the currently selected MEM-AP.
+ */
+int mem_ap_read_buf_u32(struct swjdp_common *swjdp, uint8_t *buffer,
+ int count, uint32_t address)
{
int wcount, blocksize, readcount, errorcount = 0, retval = ERROR_OK;
uint32_t adr = address;
@@ -884,8 +886,12 @@ int mem_ap_read_buf_u32(struct swjdp_common *swjdp, uint8_t *buffer, int count,
while (wcount > 0)
{
- /* Adjust to read blocks within boundaries aligned to the TAR autoincremnent size*/
- blocksize = max_tar_block_size(swjdp->tar_autoincr_block, address);
+ /* Adjust to read blocks within boundaries aligned to the
+ * TAR autoincrement size (at least 2^10). Autoincrement
+ * mode avoids an extra per-word roundtrip to update TAR.
+ */
+ blocksize = max_tar_block_size(swjdp->tar_autoincr_block,
+ address);
if (wcount < blocksize)
blocksize = wcount;
@@ -893,7 +899,8 @@ int mem_ap_read_buf_u32(struct swjdp_common *swjdp, uint8_t *buffer, int count,
if (blocksize == 0)
blocksize = 1;
- dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_SINGLE, address);
+ dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_SINGLE,
+ address);
/* Scan out first read */
adi_jtag_dp_scan(swjdp, JTAG_DP_APACC, AP_REG_DRW,
@@ -928,7 +935,8 @@ int mem_ap_read_buf_u32(struct swjdp_common *swjdp, uint8_t *buffer, int count,
if (errorcount > 1)
{
- LOG_WARNING("Block read error address 0x%" PRIx32 ", count 0x%x", address, count);
+ LOG_WARNING("Block read error address 0x%" PRIx32
+ ", count 0x%x", address, count);
return ERROR_JTAG_DEVICE_ERROR;
}
}
@@ -944,7 +952,8 @@ int mem_ap_read_buf_u32(struct swjdp_common *swjdp, uint8_t *buffer, int count,
for (i = 0; i < 4; i++)
{
- *((uint8_t*)pBuffer) = (data >> 8 * (adr & 0x3));
+ *((uint8_t*)pBuffer) =
+ (data >> 8 * (adr & 0x3));
pBuffer++;
adr++;
}
@@ -1005,7 +1014,16 @@ static int mem_ap_read_buf_packed_u16(struct swjdp_common *swjdp,
return retval;
}
-int mem_ap_read_buf_u16(struct swjdp_common *swjdp, uint8_t *buffer, int count, uint32_t address)
+/**
+ * Synchronously read a block of 16-bit halfwords into a buffer
+ * @param swjdp The DAP connected to the MEM-AP.
+ * @param buffer where the halfwords will be stored (in host byte order).
+ * @param count How many halfwords to read.
+ * @param address Memory address from which to read words; all the
+ * words must be readable by the currently selected MEM-AP.
+ */
+int mem_ap_read_buf_u16(struct swjdp_common *swjdp, uint8_t *buffer,
+ int count, uint32_t address)
{
uint32_t invalue, i;
int retval = ERROR_OK;
@@ -1094,7 +1112,16 @@ static int mem_ap_read_buf_packed_u8(struct swjdp_common *swjdp,
return retval;
}
-int mem_ap_read_buf_u8(struct swjdp_common *swjdp, uint8_t *buffer, int count, uint32_t address)
+/**
+ * Synchronously read a block of bytes into a buffer
+ * @param swjdp The DAP connected to the MEM-AP.
+ * @param buffer where the bytes will be stored.
+ * @param count How many bytes to read.
+ * @param address Memory address from which to read data; all the
+ * data must be readable by the currently selected MEM-AP.
+ */
+int mem_ap_read_buf_u8(struct swjdp_common *swjdp, uint8_t *buffer,
+ int count, uint32_t address)
{
uint32_t invalue;
int retval = ERROR_OK;